2001 Boston, Massachusetts (BOS)
2001 BOSTON, MASSACHUSETTS (BOS)
Climate is the composite of numerous weather elements. Three important influences are responsible for the main features of the Boston climate. First, the latitude places the city in the zone of prevailing west to east atmospheric flow. Both polar and tropical air masses influence the region. Secondly, Boston is situated on or near several tracks frequently followed by low pressure storm systems. The weather fluctuates regularly from fair to cloudy to stormy conditions and assures an adequate amount of precipitation. The third factor is the east–coast location of Boston. The ocean has a moderating influence on temperature extremes of winter and summer.
Hot summer afternoons are frequently relieved by the locally celebrated sea breeze, as air flows inland from the cool water surface to displace the warm air over the land. This refreshing east wind is more commonly experienced along the shore than in the interior of the city or the western suburbs. In winter, under appropriate conditions, the severity of cold waves is reduced by the nearness of the relatively warm ocean. The average last occurrence of freezing temperature in spring is early April and the first occurrence of freezing temperature in autumn is early November. In suburban areas, especially away from the coast, these dates are later in spring and earlier in autumn by up to one month in the more susceptible localities.
Boston has no dry season. Most growing seasons have several shorter dry spells during which irrigation for high–value crops may be useful. Much of the rainfall from June to September comes from showers and thunderstorms. During the rest of the year, low pressure systems pass more or less regularly and produce precipitation on an average of roughly one day in three. Coastal storms, or northeasters, are prolific producers of rain and snow. The main snow season extends from December through March. Periods when the ground is bare or nearly bare of snow may occur at any time in the winter.
Relative humidity has been known to fall as low as 5 percent but such desert dryness is very rare. Heavy fog occurs on an average of about two days per month with its prevalence increasing eastward from the interior of Boston Bay to the open waters beyond.
Although winds of 30 mph or higher may be expected on at least one day in every month of the year, gales are both more common and more severe in winter.
NORMALS, MEANS, AND EXTREMES
BOSTON, MA (BOS)
LATITUDE: LONGITUDE: ELEVATION (FT): TIME ZONE: WBAN: 14739
42 21′ 38″ N 71 00′ 38″ W GRND: 19 BARO: 180 EASTERN (UTC + 5)
ELEMENT | POR | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | YEAR | |
TEMPERATURE F | NORMAL DAILY MAXIMUM | 30 | 35.7 | 37.5 | 45.8 | 55.9 | 66.6 | 76.3 | 81.8 | 79.8 | 72.8 | 62.7 | 52.2 | 40.4 | 59.0 |
MEAN DAILY MAXIMUM | 56 | 36.6 | 38.3 | 45.5 | 56.1 | 66.8 | 76.8 | 81.8 | 79.9 | 72.5 | 62.7 | 52.0 | 40.9 | 59.2 | |
HIGHEST DAILY MAXIMUM | 50 | 66 | 70 | 89 | 94 | 95 | 100 | 102 | 102 | 100 | 90 | 79 | 76 | 102 | |
YEAR OF OCCURRENCE | 1995 | 1985 | 1998 | 1976 | 1979 | 1952 | 1977 | 1975 | 1953 | 1963 | 1994 | 1998 | JUL 1977 | ||
MEAN OF EXTREME MAXS. | 56 | 56.0 | 56.2 | 66.9 | 77.8 | 87.3 | 92.7 | 95.2 | 92.9 | 88.9 | 80.1 | 69.9 | 60.8 | 77.1 | |
NORMAL DAILY MINIMUM | 30 | 21.6 | 23.0 | 31.3 | 40.2 | 49.8 | 59.1 | 65.1 | 64.0 | 56.8 | 46.9 | 38.3 | 26.7 | 43.6 | |
MEAN DAILY MINIMUM | 56 | 22.0 | 23.6 | 31.2 | 40.3 | 49.8 | 59.3 | 65.2 | 64.0 | 56.7 | 47.0 | 38.1 | 27.2 | 43.7 | |
LOWEST DAILY MINIMUM | 50 | -12 | -4 | 6 | 16 | 34 | 45 | 50 | 47 | 38 | 28 | 15 | -7 | -12 | |
YEAR OF OCCURRENCE | 1957 | 1961 | 1984 | 1982 | 1956 | 1986 | 1988 | 1986 | 2000 | 1976 | 1989 | 1980 | JAN 1957 | ||
MEAN OF EXTREME MINS. | 56 | 3.4 | 6.1 | 15.4 | 29.6 | 40.3 | 49.4 | 57.1 | 54.7 | 44.2 | 34.6 | 24.3 | 9.5 | 30.7 | |
NORMAL DRY BULB | 30 | 28.6 | 30.3 | 38.6 | 48.1 | 58.2 | 67.7 | 73.5 | 71.9 | 64.8 | 54.8 | 45.3 | 33.6 | 51.3 | |
MEAN DRY BULB | 56 | 29.3 | 31.0 | 38.3 | 48.2 | 58.3 | 68.0 | 73.5 | 72.0 | 64.5 | 54.9 | 45.1 | 34.1 | 51.4 | |
MEAN WET BULB | 18 | 26.7 | 28.2 | 33.9 | 42.1 | 51.6 | 61.0 | 65.8 | 65.4 | 58.8 | 46.4 | 40.1 | 29.1 | 45.8 | |
MEAN DEW POINT | 18 | 18.8 | 19.7 | 24.6 | 34.7 | 43.3 | 55.8 | 61.3 | 61.3 | 54.5 | 40.9 | 33.4 | 21.5 | 39.1 | |
NORMAL NO. DAYS WITH: | |||||||||||||||
MAXIMUM 90 | 30 | 0.0 | 0.0 | 0.0 | 0.1 | 0.5 | 2.5 | 5.4 | 2.9 | 0.8 | * | 0.0 | 0.0 | 12.2 | |
MAXIMUM 32 | 30 | 11.4 | 8.0 | 2.0 | * | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.3 | 6.5 | 28.2 | |
MINIMUM 32 | 30 | 26.1 | 23.5 | 16.8 | 2.7 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.6 | 7.0 | 22.3 | 99.0 | |
MINIMUM 0 | 30 | 0.5 | 0.5 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.2 | 1.2 | |
H/C | NORMAL HEATING DEG. DAYS | 30 | 1128 | 972 | 818 | 507 | 221 | 32 | 0 | 6 | 72 | 321 | 591 | 973 | 5641 |
NORMAL COOLING DEG. DAYS | 30 | 0 | 0 | 0 | 0 | 10 | 113 | 264 | 220 | 66 | 5 | 0 | 0 | 678 | |
RH | NORMAL (PERCENT) | 30 | 62 | 62 | 63 | 63 | 67 | 68 | 68 | 71 | 72 | 68 | 68 | 65 | 66 |
HOUR 01 LST | 30 | 65 | 65 | 67 | 69 | 74 | 77 | 77 | 79 | 80 | 76 | 72 | 68 | 72 | |
HOUR 07 LST | 30 | 67 | 68 | 69 | 68 | 71 | 73 | 74 | 77 | 79 | 77 | 74 | 71 | 72 | |
HOUR 13 LST | 30 | 57 | 56 | 56 | 55 | 58 | 58 | 57 | 59 | 59 | 57 | 59 | 59 | 58 | |
HOUR 19 LST | 30 | 61 | 60 | 62 | 61 | 64 | 66 | 66 | 69 | 71 | 67 | 66 | 64 | 65 | |
S | PERCENT POSSIBLE SUNSHINE | 61 | 53 | 56 | 57 | 56 | 58 | 63 | 65 | 65 | 63 | 60 | 50 | 52 | 58 |
W/O | MEAN NO. DAYS WITH: | ||||||||||||||
HEAVY FOG (VISBY 1/4 MI) | 67 | 1.8 | 1.7 | 2.0 | 1.7 | 2.7 | 2.1 | 2.3 | 1.8 | 1.9 | 2.2 | 1.8 | 1.3 | 23.3 | |
THUNDERSTORMS | 67 | 0.2 | 0.1 | 0.6 | 1.0 | 2.3 | 3.4 | 4.2 | 3.4 | 1.7 | 0.7 | 0.4 | 0.2 | 18.2 | |
CLOUDINESS | MEAN: | ||||||||||||||
SUNRISE-SUNSET (OKTAS) | 61 | 5.0 | 5.0 | 5.1 | 5.3 | 5.3 | 5.0 | 4.9 | 4.5 | 4.4 | 4.4 | 5.0 | 5.0 | 4.9 | |
MIDNIGHT-MIDNIGHT (OKTAS) | 32 | 4.8 | 4.7 | 4.9 | 4.9 | 5.0 | 4.7 | 4.7 | 4.3 | 4.3 | 4.1 | 4.8 | 4.7 | 4.7 | |
MEAN NO. DAYS WITH: | |||||||||||||||
CLEAR | 62 | 9.0 | 8.2 | 7.7 | 7.0 | 6.3 | 6.6 | 6.6 | 9.1 | 10.0 | 10.7 | 7.7 | 8.5 | 97.4 | |
PARTLY CLOUDY | 62 | 6.8 | 6.6 | 8.0 | 8.1 | 9.9 | 10.4 | 12.0 | 10.5 | 7.9 | 7.7 | 7.2 | 7.3 | 102.4 | |
CLOUDY | 62 | 15.2 | 13.4 | 15.3 | 14.9 | 14.8 | 12.9 | 11.9 | 10.9 | 11.6 | 12.1 | 14.7 | 14.9 | 162.6 | |
PR | MEAN STATION PRESSURE(IN) | 29 | 29.98 | 30.00 | 29.99 | 29.90 | 29.90 | 29.90 | 29.90 | 29.99 | 29.98 | 30.00 | 29.98 | 29.99 | 29.96 |
MEAN SEA-LEVEL PRES. (IN) | 18 | 30.03 | 30.03 | 30.01 | 29.97 | 29.97 | 29.95 | 29.97 | 30.02 | 30.06 | 30.08 | 30.06 | 30.04 | 30.02 | |
WINDS | MEAN SPEED (MPH) | 53 | 13.7 | 13.8 | 14.0 | 13.5 | 12.2 | 11.6 | 11.0 | 10.8 | 11.3 | 11.9 | 12.9 | 13.5 | 12.5 |
PREVAIL. DIR (TENS OF DEGS) | 34 | 30 | 29 | 29 | 30 | 20 | 20 | 23 | 24 | 24 | 24 | 29 | 30 | 30 | |
MAXIMUM 2-MINUTE: | |||||||||||||||
SPEED (MPH) | 5 | 39 | 40 | 46 | 41 | 40 | 45 | 45 | 30 | 47 | 41 | 48 | 46 | 48 | |
DIR. (TENS OF DEGS) | 30 | 27 | 03 | 09 | 27 | 30 | 30 | 09 | 23 | 31 | 11 | 18 | 11 | ||
YEAR OF OCCURRENCE | 2000 | 2001 | 1997 | 2000 | 2001 | 2000 | 1999 | 1997 | 1998 | 1999 | 1997 | 2000 | NOV 1997 | ||
MAXIMUM 5-SECOND: | |||||||||||||||
SPEED (MPH) | 5 | 54 | 54 | 56 | 51 | 49 | 62 | 74 | 37 | 63 | 52 | 57 | 55 | 74 | |
DIR. (TENS OF DEGS) | 30 | 21 | 06 | 01 | 32 | 29 | 25 | 10 | 23 | 32 | 11 | 18 | 25 | ||
YEAR OF OCCURRENCE | 2000 | 2000 | 2001 | 1997 | 2001 | 2000 | 1999 | 1997 | 1998 | 1999 | 1997 | 2000 | JUL 1999 | ||
PRECIPITATION | NORMAL (IN) | 30 | 3.59 | 3.62 | 3.69 | 3.60 | 3.25 | 3.09 | 2.84 | 3.24 | 3.06 | 3.30 | 4.22 | 4.01 | 41.51 |
MAXIMUM MONTHLY (IN) | 50 | 10.55 | 7.81 | 11.00 | 9.46 | 13.38 | 13.20 | 8.12 | 17.09 | 9.86 | 10.66 | 8.89 | 9.74 | 17.09 | |
YEAR OF OCCURRENCE | 1979 | 1984 | 1953 | 1987 | 1954 | 1982 | 1959 | 1955 | 1999 | 1996 | 1983 | 1969 | AUG 1955 | ||
MINIMUM MONTHLY (IN) | 50 | 0.61 | 0.72 | 0.62 | 0.83 | 0.53 | 0.48 | 0.52 | 0.82 | 0.35 | 0.41 | 0.64 | 0.81 | 0.35 | |
YEAR OF OCCURRENCE | 1989 | 1987 | 1981 | 1999 | 1964 | 1999 | 1952 | 1995 | 1957 | 1994 | 1976 | 1989 | SEP 1957 | ||
MAXIMUM IN 24 HOURS (IN) | 50 | 2.72 | 2.68 | 4.13 | 3.32 | 5.74 | 5.69 | 3.36 | 8.40 | 5.64 | 6.63 | 3.76 | 5.14 | 8.40 | |
YEAR OF OCCURRENCE | 1979 | 1969 | 1968 | 1991 | 1954 | 1998 | 1996 | 1955 | 1954 | 1996 | 1992 | 1992 | AUG 1955 | ||
NORMAL NO. DAYS WITH: | |||||||||||||||
PRECIPITATION 0.01 | 30 | 11.0 | 9.9 | 11.6 | 11.0 | 11.2 | 10.7 | 8.9 | 9.9 | 8.4 | 8.6 | 10.9 | 12.0 | 124.1 | |
PRECIPITATION 1.00 | 30 | 0.9 | 1.2 | 0.8 | 1.0 | 0.7 | 0.6 | 0.7 | 0.7 | 0.7 | 0.7 | 1.2 | 0.9 | 10.1 | |
SNOWFALL | NORMAL (IN) | 30 | 11.9 | 12.3 | 6.9 | 1.1 | 0.* | 0.0 | 0.0 | 0.0 | 0.0 | 0.* | 1.3 | 8.1 | 41.6 |
MAXIMUM MONTHLY (IN) | 64 | 39.8 | 41.3 | 38.9 | 13.3 | 0.5 | 0.0 | 0.0 | T | 0.0 | 0.2 | 10.0 | 27.9 | 41.3 | |
YEAR OF OCCURRENCE | 1996 | 1969 | 1993 | 1982 | 1977 | 1994 | 1979 | 1938 | 1970 | FEB 1969 | |||||
MAXIMUM IN 24 HOURS (IN) | 64 | 21.0 | 23.6 | 17.7 | 13.2 | 0.5 | 0.0 | 0.0 | T | 0.0 | 0.2 | 8.0 | 13.0 | 23.6 | |
YEAR OF OCCURRENCE | 1978 | 1978 | 1960 | 1982 | 1977 | 1994 | 1979 | 1987 | 1960 | FEB 1978 | |||||
MAXIMUM SNOW DEPTH (IN) | 51 | 26 | 29 | 20 | 12 | 0 | 0 | 0 | 0 | 0 | 0 | 6 | 14 | 29 | |
YEAR OF OCCURRENCE | 1978 | 1978 | 1978 | 1982 | 1987 | 1975 | FEB 1978 | ||||||||
NORMAL NO. DAYS WITH: | |||||||||||||||
SNOWFALL 1.0 | 30 | 2.9 | 2.7 | 2.1 | 0.3 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.5 | 2.5 | 11.0 |
PRECIPITATION (inches) 2001 BOSTON, MA (BOS) | |||||||||||||
YEAR | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANNUAL |
1972 | 2.05 | 5.29 | 5.37 | 3.34 | 5.26 | 6.76 | 2.19 | 0.83 | 5.94 | 2.98 | 7.02 | 6.08 | 53.11 |
1973 | 3.12 | 2.13 | 2.20 | 5.65 | 3.76 | 4.68 | 4.83 | 2.78 | 1.95 | 2.71 | 1.74 | 7.20 | 42.75 |
1974 | 3.22 | 3.24 | 4.01 | 3.86 | 2.87 | 2.29 | 1.54 | 3.41 | 7.03 | 3.12 | 1.73 | 3.92 | 40.24 |
1975 | 5.70 | 3.37 | 2.74 | 2.40 | 1.78 | 2.10 | 2.35 | 5.52 | 5.49 | 4.41 | 5.13 | 4.80 | 45.79 |
1976 | 5.29 | 2.45 | 2.42 | 2.00 | 1.98 | 0.58 | 4.30 | 7.99 | 1.56 | 4.16 | 0.64 | 3.35 | 36.72 |
1977 | 4.41 | 2.40 | 4.76 | 4.07 | 3.52 | 2.49 | 2.21 | 2.91 | 4.03 | 4.63 | 2.54 | 6.20 | 44.17 |
1978 | 8.12 | 2.87 | 2.46 | 1.79 | 4.50 | 1.53 | 1.48 | 4.62 | 1.30 | 3.13 | 2.21 | 3.63 | 37.64 |
1979 | 10.55 | 3.46 | 3.03 | 3.19 | 4.24 | 0.86 | 2.36 | 5.02 | 3.61 | 3.14 | 3.29 | 1.42 | 44.17 |
1980 | 0.74 | 0.88 | 5.37 | 4.36 | 2.30 | 3.05 | 2.20 | 1.55 | 0.82 | 4.14 | 3.01 | 0.97 | 29.39 |
1981 | 0.95 | 6.65 | 0.62 | 3.14 | 1.17 | 1.65 | 3.47 | 1.04 | 2.54 | 3.43 | 4.78 | 6.27 | 35.71 |
1982 | 4.69 | 2.66 | 2.17 | 3.42 | 2.58 | 13.20 | 4.22 | 2.22 | 1.57 | 3.19 | 3.42 | 1.27 | 44.61 |
1983 | 5.03 | 5.00 | 9.72 | 6.86 | 2.94 | 1.07 | 1.07 | 3.28 | 1.06 | 3.74 | 8.89 | 4.94 | 53.60 |
1984 | 2.31 | 7.81 | 6.82 | 4.43 | 8.77 | 3.06 | 4.43 | 1.60 | 1.22 | 5.18 | 1.68 | 2.93 | 50.24 |
1985 | 1.12 | 1.83 | 2.29 | 1.62 | 3.36 | 3.94 | 3.51 | 6.67 | 3.00 | 1.65 | 6.39 | 1.21 | 36.59 |
1986 | 3.42 | 2.83 | 3.42 | 1.59 | 1.31 | 7.74 | 3.96 | 3.32 | 1.08 | 3.27 | 6.01 | 6.38 | 44.33 |
1987 | 7.28 | 0.72 | 4.27 | 9.46 | 1.75 | 2.62 | 0.82 | 2.93 | 7.29 | 2.73 | 3.49 | 2.12 | 45.48 |
1988 | 2.50 | 3.93 | 3.52 | 1.47 | 2.86 | 1.29 | 7.62 | 1.11 | 1.29 | 1.60 | 6.57 | 1.02 | 34.78 |
1989 | 0.61 | 2.51 | 3.07 | 3.58 | 3.54 | 2.84 | 5.09 | 5.92 | 4.61 | 5.71 | 4.13 | 0.81 | 42.42 |
1990 | 3.78 | 3.60 | 1.71 | 5.94 | 6.53 | 0.69 | 4.08 | 6.57 | 1.67 | 7.36 | 1.39 | 3.18 | 46.50 |
1991 | 3.24 | 1.58 | 4.33 | 4.84 | 0.92 | 2.89 | 1.95 | 5.27 | 6.32 | 4.27 | 4.06 | 2.58 | 42.25 |
1992 | 3.11 | 2.28 | 3.59 | 2.34 | 1.40 | 4.61 | 2.66 | 4.25 | 3.46 | 1.62 | 6.14 | 8.26 | 43.72 |
1993 | 2.17 | 4.94 | 7.67 | 4.86 | 1.04 | 1.75 | 1.75 | 1.32 | 4.64 | 3.61 | 2.86 | 6.60 | 43.21 |
1994 | 5.22 | 2.95 | 7.49 | 2.25 | 5.35 | 0.86 | 1.80 | 7.03 | 4.58 | 0.41 | 4.31 | 5.37 | 47.62 |
1995 | 4.33 | 2.57 | 2.20 | 1.40 | 1.82 | 1.55 | 2.06 | 0.82 | 3.60 | 6.42 | 5.13 | 3.20 | 35.10 |
1996 | 7.44 | 3.17 | 2.36 | 4.38 | 2.73 | 1.03 | 5.23 | 1.54 | 6.09 | 10.66 | 2.29 | 5.76 | 52.68 |
1997 | 2.34 | 1.28 | 4.68 | 3.46 | 2.63 | 1.41 | 0.63 | 3.01 | 1.02 | 1.78 | 5.86 | 2.29 | 30.39 |
1998 | 4.76 | 5.54 | 4.15 | 3.58 | 6.84 | 11.58 | 2.47 | 3.37 | 3.03 | 5.38 | 1.38 | 1.59 | 53.67 |
1999 | 5.69 | 3.51 | 2.52 | 0.83 | 2.70 | T | 3.51 | 1.33 | 9.86 | 4.30 | 2.14 | 1.52 | 37.91 |
2000 | 2.62 | 2.55 | 3.59 | 5.02 | 2.88 | 6.61 | 5.20 | 2.22 | 2.87 | 2.86 | 4.51 | 4.67 | 45.60 |
2001 | 1.58 | 1.37 | 7.57 | 0.88 | 1.23 | 4.99 | 2.13 | 4.14 | 2.29 | 0.98 | 0.73 | 2.83 | 30.72 |
POR=131 YRS | 3.67 | 3.35 | 3.89 | 3.56 | 3.24 | 3.20 | 3.12 | 3.56 | 3.25 | 3.27 | 3.86 | 3.58 | 41.55 |
AVERAGE TEMPERATURE (F) 2001 BOSTON, MA (BOS) | |||||||||||||
YEAR | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANNUAL |
1972 | 33.0 | 29.6 | 36.3 | 44.9 | 57.6 | 65.4 | 73.8 | 71.5 | 65.7 | 51.8 | 42.3 | 33.0 | 50.4 |
1973 | 31.4 | 30.1 | 43.3 | 49.9 | 57.0 | 70.0 | 74.3 | 74.8 | 64.4 | 55.6 | 45.8 | 39.6 | 53.0 |
1974 | 31.7 | 29.1 | 38.7 | 50.9 | 54.7 | 64.8 | 72.4 | 72.0 | 63.7 | 50.1 | 45.3 | 37.8 | 50.9 |
1975 | 34.9 | 32.1 | 36.9 | 45.1 | 61.5 | 67.5 | 75.9 | 72.9 | 63.9 | 57.3 | 51.8 | 34.4 | 52.9 |
1976 | 26.1 | 37.3 | 41.2 | 55.1 | 60.2 | 73.4 | 72.9 | 72.0 | 64.9 | 52.3 | 41.9 | 29.0 | 52.2 |
1977 | 23.3 | 30.7 | 44.7 | 51.3 | 62.6 | 67.4 | 74.9 | 73.4 | 64.4 | 55.3 | 48.1 | 34.2 | 52.5 |
1978 | 28.5 | 27.1 | 36.2 | 48.8 | 59.3 | 68.3 | 72.1 | 71.6 | 61.4 | 52.5 | 43.6 | 35.3 | 50.4 |
1979 | 32.5 | 23.1 | 42.5 | 48.7 | 61.1 | 68.2 | 74.5 | 71.7 | 64.9 | 52.7 | 48.6 | 36.7 | 52.1 |
1980 | 29.4 | 27.9 | 36.9 | 48.7 | 59.4 | 66.3 | 75.8 | 74.2 | 67.0 | 52.4 | 41.2 | 28.6 | 50.7 |
1981 | 21.4 | 36.4 | 39.1 | 51.7 | 60.4 | 70.7 | 74.6 | 72.1 | 63.7 | 51.2 | 43.9 | 33.2 | 51.5 |
1982 | 22.9 | 30.8 | 38.7 | 48.2 | 57.8 | 63.3 | 74.9 | 70.3 | 64.1 | 54.2 | 47.6 | 39.6 | 51.0 |
1983 | 31.2 | 32.8 | 40.6 | 49.1 | 58.2 | 70.7 | 78.0 | 73.6 | 70.6 | 55.2 | 46.1 | 32.1 | 53.2 |
1984 | 26.7 | 37.6 | 31.9 | 46.1 | 58.0 | 70.5 | 74.7 | 74.6 | 62.1 | 53.3 | 44.6 | 39.5 | 51.6 |
1985 | 24.4 | 32.8 | 40.4 | 49.3 | 59.3 | 64.8 | 73.5 | 70.4 | 65.4 | 55.4 | 45.4 | 31.3 | 51.0 |
1986 | 31.4 | 28.9 | 40.7 | 48.4 | 58.4 | 66.1 | 71.0 | 70.5 | 63.2 | 54.0 | 42.3 | 35.5 | 50.9 |
1987 | 28.9 | 29.1 | 38.5 | 45.1 | 57.2 | 65.1 | 71.7 | 70.3 | 65.4 | 54.3 | 43.9 | 36.1 | 50.5 |
1988 | 27.8 | 32.2 | 39.2 | 46.8 | 57.6 | 68.5 | 73.7 | 75.5 | 64.6 | 50.8 | 46.7 | 32.8 | 51.4 |
1989 | 34.5 | 30.5 | 37.3 | 45.9 | 59.4 | 67.8 | 72.8 | 71.6 | 64.7 | 55.3 | 42.8 | 21.7 | 50.4 |
1990 | 36.4 | 34.1 | 40.1 | 47.6 | 54.9 | 66.6 | 73.1 | 73.3 | 64.6 | 58.3 | 48.5 | 40.7 | 53.2 |
1991 | 29.4 | 36.1 | 41.6 | 51.3 | 63.3 | 70.0 | 74.6 | 73.8 | 63.7 | 56.4 | 45.2 | 36.0 | 53.5 |
1992 | 31.0 | 32.4 | 35.4 | 46.4 | 55.6 | 67.8 | 69.5 | 70.4 | 63.9 | 52.5 | 42.9 | 34.8 | 50.2 |
1993 | 32.4 | 27.1 | 36.4 | 48.3 | 60.3 | 69.5 | 74.7 | 73.6 | 64.8 | 52.3 | 45.6 | 34.2 | 51.6 |
1994 | 22.2 | 26.9 | 38.2 | 51.4 | 58.4 | 71.9 | 77.5 | 72.4 | 64.2 | 55.5 | 49.0 | 38.5 | 52.2 |
1995 | 34.6 | 28.5 | 38.8 | 46.1 | 57.2 | 68.6 | 75.9 | 72.8 | 63.1 | 58.4 | 41.9 | 31.7 | 51.5 |
1996 | 30.1 | 30.9 | 36.5 | 47.9 | 57.4 | 68.1 | 71.8 | 70.9 | 64.2 | 53.2 | 40.3 | 39.3 | 50.9 |
1997 | 29.2 | 36.0 | 36.7 | 46.3 | 56.1 | 68.2 | 73.7 | 71.2 | 64.2 | 52.8 | 41.7 | 35.2 | 50.9 |
1998 | 33.9 | 35.3 | 41.5 | 49.4 | 60.3 | 64.7 | 74.4 | 72.5 | 66.3 | 54.5 | 44.6 | 39.1 | 53.0 |
1999 | 29.5 | 33.6 | 39.4 | 49.2 | 58.2 | 71.0 | 75.7 | 71.3 | 67.1 | 53.0 | 48.0 | 37.3 | 52.8 |
2000 | 27.5 | 34.2 | 43.3 | 47.3 | 57.2 | 67.3 | 70.0 | 70.3 | 63.5 | 53.9 | 43.8 | 29.2 | 50.6 |
2001 | 30.0 | 31.8 | 35.3 | 48.7 | 59.6 | 71.1 | 69.9 | 73.9 | 65.3 | 56.2 | 48.3 | 40.5 | 52.6 |
POR=129 YRS | 28.8 | 29.6 | 37.3 | 47.2 | 57.9 | 67.1 | 72.7 | 70.9 | 64.1 | 54.1 | 43.7 | 33.1 | 50.5 |
REFERENCE NOTES:
PAGE 1:
THE TEMPERATURE GRAPH SHOWS NORMAL MAXIMUM AND NORMAL MINIMUM DAILY TEMPERATURES (SOLID CURVES) AND THE ACTUAL DAILY HIGH AND LOW TEMPERATURES (VERTICAL BARS).
PAGE 2 AND 3:
H/C INDICATES HEATING AND COOLING DEGREE DAYS.
RH INDICATES RELATIVE HUMIDITY
W/O INDICATES WEATHER AND OBSTRUCTIONS
S INDICATES SUNSHINE.
PR INDICATES PRESSURE.
CLOUDINESS ON PAGE 3 IS THE SUM OF THE CEILOMETER AND SATELLITE DATA NOT TO EXCEED EIGHT EIGHTHS (OKTAS).
GENERAL:
T INDICATES TRACE PRECIPITATION, AN AMOUNT GREATER THAN ZERO BUT LESS THAN THE LOWEST REPORTABLE VALUE.
+ INDICATES THE VALUE ALSO OCCURS ON EARLIER DATES.
BLANK ENTRIES DENOTE MISSING OR UNREPORTED DATA.
NORMALS ARE 30–YEAR AVERAGES (1961–1990).
ASOS INDICATES AUTOMATED SURFACE OBSERVING SYSTEM.
PM INDICATES THE LAST DAY OF THE PREVIOUS MONTH.
POR (PERIOD OF RECORD) BEGINS WITH THE JANUARY DATA MONTH AND IS THE NUMBER OF YEARS USED TO COMPUTE THE MEAN. INDIVIDUAL MONTHS WITHIN THE POR MAY BE MISSING.
WHEN THE POR FOR A NORMAL IS LESS THAN 30 YEARS, THE NORMAL IS PROVISIONAL AND IS BASED ON THE NUMBER OF YEARS INDICATED.
0.* OR * INDICATES THE VALUE OR MEAN–DAYS–WITH IS BETWEEN 0.00 AND 0.05.
CLOUDINESS FOR ASOS STATIONS DIFFERS FROM THE NON–ASOS OBSERVATION TAKEN BY A HUMAN OBSERVER. ASOS STATION CLOUDINESS IS BASED ON TIME–AVERAGED CEILOMETER DATA FOR CLOUDS AT OR BELOW 12,000 FEET AND ON SATELLITE DATA FOR CLOUDS ABOVE 12,000 FEET.
THE NUMBER OF DAYS WITH CLEAR, PARTLY CLOUDY, AND CLOUDY CONDITIONS FOR ASOS STATIONS IS THE SUM OF THE CEILOMETER AND SATELLITE DATA FOR THE SUNRISE TO SUNSET PERIOD.
GENERAL CONTINUED:
CLEAR INDICATES 0–2 OKTAS, PARTLY CLOUDY INDICATES 3–6 OKTAS, AND CLOUDY INDICATES 7 OR 8 OKTAS. WHEN AT LEAST ONE OF THE ELEMENTS (CEILOMETER OR SATELLITE) IS MISSING, THE DAILY CLOUDINESS IS NOT COMPUTED.
WIND DIRECTION IS RECORDED IN TENS OF DEGREES (2 DIGITS) CLOCKWISE FROM TRUE NORTH. "00" INDICATES CALM. "36" INDICATES TRUE NORTH.
RESULTANT WIND IS THE VECTOR AVERAGE OF THE SPEED AND DIRECTION.
AVERAGE TEMPERATURE IS THE SUM OF THE MEAN DAILY MAXIMUM AND MINIMUM TEMPERATURE DIVIDED BY 2.
SNOWFALL DATA COMPRISE ALL FORMS OF FROZEN PRECIPITATION, INCLUDING HAIL.
A HEATING (COOLING) DEGREE DAY IS THE DIFFERENCE BETWEEN THE AVERAGE DAILY TEMPERATURE AND 65 F.
DRY BULB IS THE TEMPERATURE OF THE AMBIENT AIR.
DEW POINT IS THE TEMPERATURE TO WHICH THE AIR MUST BE COOLED TO ACHIEVE 100 PERCENT RELATIVE HUMIDITY.
WET BULB IS THE TEMPERATURE THE AIR WOULD HAVE IF THE MOISTURE CONTENT WAS INCREASED TO 100 PERCENT RELATIVE HUMIDITY.
ON JULY 1, 1996, THE NATIONAL WEATHER SERVICE BEGAN USING THE "METAR" OBSERVATION CODE THAT WAS ALREADY EMPLOYED BY MOST OTHER NATIONS OF THE WORLD. THE MOST NOTICEABLE DIFFERENCE IN THIS ANNUAL PUBLICATION WILL BE THE CHANGE IN UNITS FROM TENTHS TO EIGHTS (OKTAS) FOR REPORTING THE AMOUNT OF SKY COVER.
HEATING DEGREE DAYS (base 65 F) 2001 BOSTON, MA (BOS) | |||||||||||||
YEAR | JUL | AUG | SEP | OCT | NOV | DEC | JAN | FEB | MAR | APR | MAY | JUN | TOTAL |
1972-73 | 3 | 4 | 51 | 405 | 673 | 985 | 1033 | 971 | 666 | 450 | 258 | 24 | 5523 |
1973-74 | 0 | 2 | 94 | 289 | 570 | 782 | 1023 | 1000 | 809 | 429 | 335 | 77 | 5410 |
1974-75 | 0 | 2 | 102 | 458 | 587 | 836 | 925 | 918 | 866 | 590 | 162 | 59 | 5505 |
1975-76 | 0 | 8 | 70 | 239 | 395 | 941 | 1198 | 800 | 733 | 331 | 166 | 16 | 4897 |
1976-77 | 1 | 10 | 55 | 393 | 688 | 1108 | 1290 | 956 | 623 | 414 | 158 | 43 | 5739 |
1977-78 | 0 | 4 | 85 | 304 | 498 | 948 | 1127 | 1057 | 885 | 480 | 209 | 18 | 5615 |
1978-79 | 11 | 11 | 150 | 381 | 635 | 916 | 1002 | 1169 | 691 | 481 | 149 | 19 | 5615 |
1979-80 | 2 | 15 | 80 | 390 | 484 | 873 | 1096 | 1071 | 866 | 481 | 185 | 66 | 5609 |
1980-81 | 2 | 5 | 72 | 387 | 706 | 1120 | 1344 | 794 | 796 | 393 | 200 | 7 | 5826 |
1981-82 | 2 | 6 | 91 | 419 | 628 | 979 | 1300 | 948 | 811 | 496 | 231 | 113 | 6024 |
1982-83 | 2 | 19 | 71 | 338 | 515 | 783 | 1040 | 896 | 749 | 478 | 223 | 22 | 5136 |
1983-84 | 0 | 8 | 42 | 327 | 561 | 1012 | 1182 | 790 | 1020 | 563 | 239 | 36 | 5780 |
1984-85 | 3 | 0 | 142 | 359 | 605 | 781 | 1255 | 897 | 758 | 471 | 204 | 71 | 5546 |
1985-86 | 3 | 11 | 65 | 298 | 580 | 1035 | 1035 | 1008 | 746 | 490 | 258 | 66 | 5595 |
1986-87 | 21 | 16 | 98 | 344 | 674 | 904 | 1112 | 997 | 814 | 588 | 285 | 76 | 5929 |
1987-88 | 8 | 18 | 57 | 326 | 626 | 888 | 1145 | 945 | 792 | 541 | 253 | 61 | 5660 |
1988-89 | 9 | 10 | 64 | 443 | 541 | 992 | 938 | 959 | 853 | 565 | 196 | 51 | 5621 |
1989-90 | 2 | 4 | 88 | 294 | 660 | 1336 | 880 | 857 | 762 | 524 | 307 | 60 | 5774 |
1990-91 | 4 | 5 | 84 | 236 | 496 | 744 | 1096 | 803 | 721 | 407 | 126 | 35 | 4757 |
1991-92 | 1 | 8 | 111 | 273 | 586 | 894 | 1049 | 937 | 913 | 552 | 317 | 37 | 5678 |
1992-93 | 21 | 14 | 109 | 386 | 656 | 930 | 1002 | 1056 | 880 | 493 | 167 | 31 | 5745 |
1993-94 | 3 | 1 | 89 | 387 | 579 | 946 | 1320 | 1059 | 827 | 404 | 226 | 7 | 5848 |
1994-95 | 1 | 3 | 61 | 288 | 479 | 813 | 932 | 1016 | 804 | 561 | 258 | 30 | 5246 |
1995-96 | 1 | 2 | 113 | 214 | 685 | 1023 | 1074 | 981 | 875 | 510 | 260 | 20 | 5758 |
1996-97 | 1 | 6 | 80 | 358 | 739 | 792 | 1104 | 806 | 868 | 551 | 269 | 87 | 5661 |
1997-98 | 5 | 3 | 83 | 383 | 693 | 917 | 955 | 826 | 736 | 462 | 192 | 66 | 5321 |
1998-99 | 0 | 2 | 36 | 321 | 606 | 798 | 1092 | 872 | 790 | 468 | 215 | 29 | 5229 |
1999-00 | 2 | 7 | 39 | 363 | 505 | 851 | 1152 | 887 | 665 | 523 | 250 | 74 | 5318 |
2000-01 | 6 | 2 | 108 | 341 | 628 | 1103 | 1079 | 925 | 914 | 488 | 217 | 18 | 5829 |
2001- | 2 | 1 | 67 | 286 | 492 | 753 |
COOLING DEGREE DAYS (base 65 F) 2001 BOSTON, MA (BOS) | |||||||||||||
YEAR | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANNUAL |
1972 | 0 | 0 | 0 | 0 | 26 | 74 | 279 | 213 | 79 | 0 | 0 | 0 | 671 |
1973 | 0 | 0 | 0 | 7 | 18 | 180 | 296 | 316 | 84 | 3 | 0 | 0 | 904 |
1974 | 0 | 0 | 0 | 10 | 22 | 81 | 235 | 226 | 68 | 1 | 3 | 0 | 646 |
1975 | 0 | 0 | 0 | 0 | 60 | 139 | 345 | 261 | 44 | 9 | 4 | 0 | 862 |
1976 | 0 | 0 | 0 | 43 | 25 | 276 | 251 | 231 | 61 | 8 | 0 | 0 | 895 |
1977 | 0 | 0 | 1 | 13 | 92 | 124 | 314 | 272 | 75 | 6 | 0 | 0 | 897 |
1978 | 0 | 0 | 0 | 0 | 40 | 122 | 237 | 221 | 48 | 0 | 0 | 0 | 668 |
1979 | 0 | 0 | 0 | 0 | 35 | 122 | 304 | 226 | 85 | 17 | 0 | 0 | 789 |
1980 | 0 | 0 | 0 | 0 | 18 | 114 | 347 | 299 | 137 | 1 | 0 | 0 | 916 |
1981 | 0 | 0 | 0 | 0 | 67 | 185 | 306 | 232 | 60 | 0 | 0 | 0 | 850 |
1982 | 0 | 0 | 0 | 0 | 15 | 67 | 314 | 192 | 49 | 10 | 2 | 0 | 649 |
1983 | 0 | 0 | 0 | 7 | 18 | 200 | 410 | 283 | 217 | 27 | 0 | 0 | 1162 |
1984 | 0 | 0 | 0 | 3 | 31 | 207 | 312 | 306 | 62 | 3 | 0 | 0 | 924 |
1985 | 0 | 0 | 0 | 5 | 30 | 72 | 271 | 183 | 83 | 8 | 0 | 0 | 652 |
1986 | 0 | 0 | 0 | 0 | 60 | 105 | 211 | 190 | 55 | 10 | 0 | 0 | 631 |
1987 | 0 | 0 | 0 | 0 | 48 | 87 | 221 | 189 | 76 | 0 | 2 | 0 | 623 |
1988 | 0 | 0 | 0 | 0 | 31 | 173 | 287 | 342 | 59 | 11 | 0 | 0 | 903 |
1989 | 0 | 0 | 1 | 0 | 29 | 142 | 248 | 214 | 89 | 0 | 0 | 0 | 723 |
1990 | 0 | 0 | 0 | 10 | 2 | 116 | 261 | 268 | 77 | 34 | 8 | 0 | 776 |
1991 | 0 | 0 | 0 | 3 | 79 | 189 | 304 | 287 | 79 | 15 | 0 | 0 | 956 |
1992 | 0 | 0 | 0 | 0 | 30 | 126 | 165 | 189 | 83 | 5 | 0 | 0 | 598 |
1993 | 0 | 0 | 0 | 0 | 28 | 173 | 310 | 273 | 89 | 0 | 2 | 0 | 875 |
1994 | 0 | 0 | 0 | 1 | 29 | 221 | 395 | 241 | 44 | 1 | 4 | 0 | 936 |
1995 | 0 | 0 | 0 | 0 | 24 | 147 | 344 | 252 | 64 | 15 | 0 | 0 | 846 |
1996 | 0 | 0 | 0 | 3 | 30 | 120 | 222 | 196 | 63 | 0 | 1 | 0 | 635 |
1997 | 0 | 0 | 0 | 0 | 0 | 189 | 280 | 202 | 66 | 12 | 0 | 0 | 749 |
1998 | 0 | 0 | 16 | 2 | 52 | 59 | 298 | 240 | 83 | 1 | 0 | 0 | 751 |
1999 | 0 | 0 | 0 | 0 | 11 | 215 | 344 | 213 | 110 | 0 | 0 | 0 | 893 |
2000 | 0 | 0 | 0 | 0 | 15 | 151 | 167 | 174 | 71 | 5 | 0 | 0 | 583 |
2001 | 0 | 0 | 0 | 9 | 55 | 210 | 160 | 283 | 83 | 20 | 0 | 0 | 820 |
SNOWFALL (inches) 2001 BOSTON, MA (BOS) | |||||||||||||
YEAR | JUL | AUG | SEP | OCT | NOV | DEC | JAN | FEB | MAR | APR | MAY | JUN | TOTAL |
1972-73 | 0.0 | 0.0 | 0.0 | T | 0.6 | 3.3 | 3.6 | 2.5 | 0.3 | T | 0.0 | 0.0 | 10.3 |
1973-74 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | T | 16.0 | 17.8 | 0.1 | 3.0 | 0.0 | 0.0 | 36.9 |
1974-75 | 0.0 | 0.0 | 0.0 | 0.0 | 2.0 | 3.6 | 2.2 | 17.0 | 1.8 | 1.0 | 0.0 | 0.0 | 27.6 |
1975-76 | 0.0 | 0.0 | 0.0 | T | 0.1 | 19.3 | 15.0 | 1.4 | 10.8 | T | 0.0 | 0.0 | 46.6 |
1976-77 | 0.0 | 0.0 | 0.0 | 0.0 | 1.0 | 17.2 | 23.2 | 5.9 | 10.7 | T | 0.5 | 0.0 | 58.5 |
1977-78 | 0.0 | 0.0 | 0.0 | 0.0 | 0.7 | 5.2 | 35.9 | 27.2 | 16.1 | T | 0.0 | 0.0 | 85.1 |
1978-79 | 0.0 | 0.0 | 0.0 | 0.0 | 4.2 | 5.8 | 10.5 | 6.6 | T | 0.4 | 0.0 | 0.0 | 27.5 |
1979-80 | 0.0 | 0.0 | 0.0 | 0.2 | T | 2.0 | 0.4 | 6.5 | 3.6 | T | 0.0 | 0.0 | 12.7 |
1980-81 | 0.0 | 0.0 | 0.0 | 0.0 | 2.4 | 5.6 | 11.9 | 1.9 | 0.5 | 0.0 | 0.0 | 0.0 | 22.3 |
1981-82 | 0.0 | 0.0 | 0.0 | 0.0 | T | 17.6 | 18.0 | 7.6 | 5.3 | 13.3 | 0.0 | 0.0 | 61.8 |
1982-83 | 0.0 | 0.0 | 0.0 | 0.0 | T | 5.5 | 4.7 | 22.3 | 0.2 | T | 0.0 | 0.0 | 32.7 |
1983-84 | 0.0 | 0.0 | 0.0 | 0.0 | T | 2.6 | 21.1 | 0.3 | 19.0 | T | 0.0 | 0.0 | 43.0 |
1984-85 | 0.0 | 0.0 | 0.0 | 0.0 | T | 3.7 | 7.0 | 10.2 | 3.7 | 2.0 | 0.0 | 0.0 | 26.6 |
1985-86 | 0.0 | 0.0 | 0.0 | 0.0 | 3.0 | 1.3 | 0.8 | 10.4 | 2.6 | T | 0.0 | 0.0 | 18.1 |
1986-87 | 0.0 | 0.0 | 0.0 | 0.0 | 3.5 | 3.4 | 24.3 | 3.7 | 3.5 | 4.1 | 0.0 | 0.0 | 42.5 |
1987-88 | 0.0 | 0.0 | 0.0 | 0.0 | 9.0 | 7.5 | 17.0 | 14.1 | 5.0 | T | 0.0 | 0.0 | 52.6 |
1988-89 | 0.0 | 0.0 | 0.0 | T | 0.0 | 3.7 | 1.5 | 6.7 | 3.2 | 0.4 | 0.0 | 0.0 | 15.5 |
1989-90 | 0.0 | 0.0 | 0.0 | 0.0 | 4.5 | 6.2 | 7.0 | 16.9 | 4.1 | 0.5 | 0.0 | 0.0 | 39.2 |
1990-91 | 0.0 | 0.0 | 0.0 | 0.0 | T | 1.2 | 11.7 | 2.8 | 3.4 | 0.0 | 0.0 | 0.0 | 19.1 |
1991-92 | 0.0 | 0.0 | 0.0 | 0.0 | T | 5.8 | 0.4 | 4.0 | 10.8 | 1.0 | 0.0 | 0.0 | 22.0 |
1992-93 | 0.0 | 0.0 | 0.0 | 0.0 | 0.6 | 9.7 | 12.9 | 19.6 | 38.9 | 2.2 | 0.0 | 0.0 | 83.9 |
1993-94 | 0.0 | 0.0 | 0.0 | 0.0 | T | 11.6 | 33.7 | 36.2 | 14.8 | 0.0 | 0.0 | 0.0 | 96.3 |
1994-95 | 0.0 | T | 0.0 | 0.0 | 0.1 | 1.5 | 4.4 | 8.5 | 0.4 | T | 0.0 | 0.0 | 14.9 |
1995-96 | 0.0 | 0.0 | 0.0 | 0.0 | 4.1 | 24.1 | 39.8 | 15.5 | 16.8 | ||||
1996-97 | 1.6 | ||||||||||||
1997-98 | |||||||||||||
1998-99 | 16.8 | 7.4 | 11.4 | 0.0 | 0.0 | 0.0 | |||||||
1999-00 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 13.7 | 9.2 | 2.0 | T | 0.0 | 0.0 | 24.9 |
2000-01 | 0.0 | 0.0 | 0.0 | T | T | 4.5 | 12.4 | 9.8 | 19.2 | T | 0.0 | 0.0 | 45.9 |
2001- | 0.0 | 0.0 | 0.0 | T | 0.0 | 5.0 | |||||||
POR=63 YRS | 0.0 | T | 0.0 | 0.0 | 1.3 | 7.5 | 12.6 | 11.4 | 8.1 | 0.9 | 0.0 | 0.0 | 41.8 |