2001 Concord, New Hampshire (CON)

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2001 CONCORD, NEW HAMPSHIRE (CON)

Concord, the Capital of New Hampshire, is situated near the geographical center of New England at an altitude of approximately 300 feet above sea level on the Merrimack River. Its surroundings are hilly with many lakes and ponds. The countryside is generously wooded, mostly on land reclaimed from fields which were formerly cleared for farming. From the coast about 50 miles to the southeast, the terrain slopes gently upward to the city. West of the city, the land rises some 2,000 feet higher in only half that distance. Mount Washington, at an elevation of 6,288 feet is in the White Mountains 75 miles north of town.

Northwesterly winds are prevalent. They bring cold, dry air during the winter and pleasantly cool, dry air in the summer. Stronger southerly winds occur during July and August, and easterly winds usually accompany summer and winter storms. Winter breezes are somewhat lighter, and winds are frequently calm during the night and early morning hours. Low temperatures, as a rule, do not interrupt normal out–of–doors activity because winds are calm or light, producing a low wind chill factor.

Very hot summer weather is infrequent. During any month, temperatures considerably above the average maxima and much below the normal minima are observed.

The average amount of precipitation for the warmer half of the year differs little from that for the colder half. Precipitation occurrences average approximately one day of three for the year, with a somewhat higher frequency for the April–May period, offsetting the lower frequency of August–October. The more significant rains and heavier snowfalls are associated with easterly winds, especially northeasterly winds. The first snowfall of an inch or more is likely to come between the middle of November and the middle of December. The snow cover normally lasts from mid–December until the last week of March, but bare ground is not rare in the winter, nor is a snowscape rare earlier or later in the season. Rain, sleet, or freezing rain may also occur.

Agriculture is neither intensive nor large–scale in the vicinity of the station. Potatoes and other frost–resistant vegetables, hardy fruits such as apples, forage for the dairy industry, and maple sugar are the principal crops.

Based on the 1951–1980 period, the average first occurrence of 32 degrees Fahrenheit in the fall is September 22 and the average last occurrence in the spring is May 23. Freezing temperatures have occurred as late as June and as early as August.

NORMALS, MEANS, AND EXTREMES

CONCORD, NH (CON)

LATITUDE:    LONGITUDE:    ELEVATION (FT):    TIME ZONE:    WBAN: 14745

43 11′ 43″ N  71 30′ 04″ W  GRND: 340 BARO: 343  EASTERN (UTC + 5)

ELEMENTPORJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECYEAR
TEMPERATURE FNORMAL DAILY MAXIMUM3029.833.042.856.368.977.382.479.871.660.747.134.257.0
MEAN DAILY MAXIMUM5431.034.042.756.769.077.882.480.472.061.147.635.357.5
HIGHEST DAILY MAXIMUM6068678995979810210198908073102
YEAR OF OCCURRENCE195019971998197619621995196619751953196319501998JUL 1966
MEAN OF EXTREME MAXS.5450.652.364.878.888.392.494.092.188.279.567.955.475.4
NORMAL DAILY MINIMUM307.410.422.131.541.451.256.554.746.034.927.014.433.1
MEAN DAILY MINIMUM549.712.022.232.141.951.756.754.946.435.627.715.833.9
LOWEST DAILY MINIMUM60–33–37–168213035292110–5–22–37
YEAR OF OCCURRENCE198419431967196919661972196519651947197219891951FEB 1943
MEAN OF EXTREME MINS.54–13.7–11.61.018.027.536.643.340.329.619.410.2–6.516.2
NORMAL DRY BULB3018.621.832.443.955.264.269.567.358.847.837.124.345.1
MEAN DRY BULB5420.222.932.344.355.464.769.767.659.048.337.725.545.6
MEAN WET BULB1719.821.829.239.350.158.963.762.454.741.734.624.641.7
MEAN DEW POINT1713.013.820.731.043.353.959.458.550.836.828.818.535.7
NORMAL NO. DAYS WITH:
MAXIMUM 90300.00.00.00.20.92.24.62.50.7*0.00.011.1
MAXIMUM 323017.813.14.10.20.00.00.00.00.0*1.513.650.3
MINIMUM 323030.527.126.116.95.50.20.00.12.413.621.729.2173.3
MINIMUM 0309.66.91.10.00.00.00.00.00.00.00.25.223.0
H/CNORMAL HEATING DEG. DAYS3014381210101163331270133919653383712627554
NORMAL COOLING DEG. DAYS30000084615311110000328
RHNORMAL (PERCENT)3068666562657172747673737270
HOUR 01 LST3074737476828889909085817882
HOUR 07 LST3074757675768284889087837981
HOUR 13 LST3058555246465251535452596253
HOUR 19 LST3066625954566364707572727065
SPERCENT POSSIBLE SUNSHINE5852555352545763605653434754
W/OMEAN NO. DAYS WITH:
HEAVY FOG(VISBY 1/4 MI)612.52.13.01.93.13.74.96.48.56.13.62.848.6
THUNDERSTORMS610.00.10.20.92.44.65.43.71.80.60.10.019.8
CLOUDINESSMEAN:
SUNRISE–SUNSET (OKTAS)555.05.05.15.35.45.04.94.64.74.65.35.05.0
MIDNIGHT–MIDNIGHT (OKTAS)324.74.64.74.95.04.74.64.44.64.45.04.84.7
MEAN NO. DAYS WITH:
CLEAR559.07.57.77.06.16.16.58.18.49.06.27.789.3
PARTLY CLOUDY557.17.68.08.19.911.612.211.18.98.77.57.7108.4
CLOUDY5514.913.215.314.915.012.211.711.312.212.715.815.1164.3
PRMEAN STATION PRESSURE(IN)2929.6129.6029.6029.6029.6029.5929.6029.7029.6929.7029.6929.5929.63
MEAN SEA–LEVEL PRES. (IN)1730.0430.0329.9929.9629.9729.9429.9630.0230.0730.0930.0530.0330.01
WINDSMEAN SPEED (MPH)377.07.58.07.76.86.45.75.25.45.96.56.66.6
PREVAIL. DIR (TENS OF DEGS)2131313131323231323231313131
MAXIMUM 2–MINUTE:
SPEED (MPH)538403938333143263637363943
DIR. (TENS OF DEGS)33313020293532260631343232
YEAR OF OCCURRENCE200020011997200020011997199919971999199819971999JUL 1999
MAXIMUM 5–SECOND:
SPEED (MPH)547495149434652334449445252
DIR. (TENS OF DEGS)29283420303532243229343232
YEAR OF OCCURRENCE199720011999200019971997199919971999199819971999DEC 1999
PRECIPITATIONNORMAL (IN)302.512.532.722.913.143.153.233.322.813.233.663.1636.37
MAXIMUM MONTHLY (IN)608.097.777.816.119.5210.106.537.269.448.787.367.5210.10
YEAR OF OCCURRENCE197919811953199619841944198819911999196219831973JUN 1944
MINIMUM MONTHLY (IN)600.400.030.860.830.600.640.960.060.410.590.750.580.03
YEAR OF OCCURRENCE197019871981199919651979195519961948194719761943FEB 1987
MAXIMUM IN 24 HOURS (IN)602.122.262.482.402.594.472.543.974.124.872.893.314.87
YEAR OF OCCURRENCE197919812001199619841944197119911960199619471969OCT 1996
NORMAL NO. DAYS WITH:
PRECIPITATION 0.013010.09.010.611.211.711.010.110.58.68.711.611.2124.2
PRECIPITATION 1.00300.40.50.50.50.50.51.00.80.81.00.80.88.1
SNOWFALLNORMAL (IN)3017.715.610.02.60.*0.00.00.00.00.14.514.665.1
MAXIMUM MONTHLY (IN)6045.449.838.315.35.0T0.00.0T2.118.438.149.8
YEAR OF OCCURRENCE1987196919561982194519931992196919711956FEB 1969
MAXIMUM IN 24 HOURS (IN)6019.014.218.113.95.0T0.00.0T2.19.514.619.0
YEAR OF OCCURRENCE1944197220011982194519931992196919611946JAN 1944
MAXIMUM SNOW DEPTH (IN)5325373417100002102637
YEAR OF OCCURRENCE19521969196919561966196919711970FEB 1969
NORMAL NO. DAYS WITH:
SNOWFALL 1.0304.53.72.90.60.*0.00.00.00.00.11.44.517.7
PRECIPITATION (inches) 2001 CONCORD, NH (CON)
YEARJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECANNUAL
19721.442.604.162.714.203.545.402.122.552.236.574.5542.07
19732.441.912.584.554.204.861.056.881.772.461.827.5242.04
19742.802.323.982.583.741.821.412.204.741.643.204.0234.45
19754.122.363.122.471.223.873.713.945.154.294.913.1242.28
19763.402.362.022.433.902.743.202.662.734.050.752.2732.51
19772.162.024.514.042.443.471.263.515.645.523.074.0041.64
19786.320.672.162.062.673.181.082.870.462.721.772.9128.87
19798.092.292.853.104.860.643.454.203.153.792.921.9341.27
19800.430.783.373.720.862.832.353.992.192.633.120.7927.06
19810.487.770.863.123.212.815.543.254.616.513.514.1745.84
19823.982.882.473.081.917.842.832.541.851.522.930.9134.74
19833.922.177.075.885.192.522.072.071.213.287.365.3548.09
19841.895.062.923.749.522.834.440.971.084.422.672.7042.24
19850.951.992.861.022.053.052.832.513.783.624.581.6530.89
19864.782.233.581.851.444.954.773.722.271.714.484.5040.28
19873.000.033.474.711.085.773.772.843.944.142.501.5536.80
19881.972.241.322.753.350.806.535.441.561.235.061.0533.30
19890.742.052.183.405.114.253.623.554.224.863.340.9138.23
19902.822.631.643.005.092.511.797.192.314.933.254.1241.28
19911.851.423.012.612.511.721.807.265.523.324.843.6239.48
19921.971.302.771.782.393.283.502.132.482.413.542.2329.78
19931.511.633.043.770.971.952.101.974.013.583.723.3631.61
19943.480.805.032.384.331.944.022.853.550.912.674.1936.15
19953.392.032.461.643.561.364.012.422.707.315.581.9538.41
19964.872.581.556.114.813.095.170.063.058.112.065.8447.30
19973.292.204.043.662.290.703.803.671.681.445.631.9534.35
19983.622.853.702.213.977.951.901.411.633.582.200.9235.94
19995.382.842.820.832.791.944.353.459.442.472.661.3540.32
20002.262.833.344.822.893.144.331.893.542.293.422.9937.74
20011.442.576.440.842.335.743.290.673.510.991.102.2431.16
POR=147 YRS2.912.583.102.993.173.293.523.353.333.193.382.9937.80
AVERAGE TEMPERATURE (F) 2001 CONCORD, NH (CON)
YEARJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECANNUAL
197222.021.227.940.256.862.869.364.157.542.331.223.443.2
197321.020.235.545.052.966.970.372.358.848.236.128.946.3
197421.421.131.845.851.162.867.567.058.942.535.926.744.4
197521.621.530.140.461.365.072.966.556.147.639.921.945.4
197610.924.731.946.753.668.966.865.357.245.031.716.143.2
197710.620.536.745.158.362.969.068.058.547.039.421.044.8
197817.513.528.040.657.565.269.769.655.946.735.322.743.5
197923.315.137.644.256.363.871.267.559.847.442.229.446.5
198022.419.131.844.455.662.870.668.458.245.134.819.244.4
198112.530.834.247.157.566.169.966.658.745.237.825.446.0
198210.920.830.241.657.360.969.565.460.247.641.732.444.9
198323.126.135.945.253.165.170.169.362.348.239.423.446.8
198416.030.528.244.652.965.968.769.357.850.438.330.346.1
198515.925.835.745.256.162.270.366.760.549.238.522.045.7
198623.021.335.548.257.561.367.366.157.347.434.129.045.7
198720.022.034.546.856.764.470.665.158.745.836.928.145.8
198818.523.533.443.957.362.972.670.557.844.939.123.245.6
198925.722.631.841.458.365.069.567.760.849.135.811.945.0
199028.624.634.745.652.865.370.869.859.751.840.130.947.9
199120.228.336.047.660.265.669.269.957.750.839.725.547.6
199223.326.030.242.555.064.066.067.159.744.935.626.545.1
199323.515.730.545.756.964.971.470.058.845.336.426.845.5
199411.316.731.945.854.467.973.466.458.249.341.530.645.6
199528.120.736.041.555.166.173.069.456.952.034.222.946.3
199621.223.429.643.953.765.268.469.360.646.333.431.345.5
199721.828.329.842.351.665.969.168.159.846.836.228.045.6
199827.330.936.846.359.264.369.869.661.249.439.031.148.7
199920.727.834.544.957.068.471.767.263.446.341.929.747.8
200020.125.438.545.455.265.167.267.458.649.238.422.546.1
200119.523.529.444.056.466.766.672.160.349.240.832.146.7
POR=131 YRS21.122.932.244.456.164.870.067.359.648.837.525.545.8

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 CONCORD, NH (CON)
YEARJULAUGSEPOCTNOVDECJANFEBMARAPRMAYJUNTOTAL
1972–7327822236951007128413571250905596370787874
1973–741592445188601112134512231025573432997455
1974–7534262136948651182133912181075730152987626
1975–7610782605327471330167211621019565356607791
1976–7737842346159921506168312428705942591198235
1977–7837582225517601360146614351138725270728094
1978–794534275563882130412841392841617280997616
1979–80336419954667510981317132410226102901237301
1980–81133324561189914171626953951530267407585
1981–82124319260881012221674123310726952461367943
1982–832566169535692100712911086895588364826800
1983–841433167521760128315169931135607382857496
1984–8519272384467921072151410929015882861067081
1985–869381664857851326129512169074992671407133
1986–874167251538919110913901199939542296777368
1987–8818892015898371138143611949716262541377490
1988–8919602196227691289121111821022703219807395
1989–90653169484865163911211121933585369677412
1990–912215183409737104913811024893517186586474
1991–921972384387541216128611231070669319907229
1992–9352332036178751190127713721062574248857588
1993–946152296008511177166113451021568338507861
1994–95154210479699105911371235893697309466819
1995–966172573979181298135211981093625358547573
1996–971061715729431038133410231086675409837350
1997–98161817856085811381161950870554186916580
1998–99515144475773104413651037940598249516696
1999–001038116571687108713871142815583316986850
2000–0120262174867901310140311571095627276687475
2001–4311674847191011
COOLING DEGREE DAYS (base 65 F) 2001 CONCORD, NH (CON)
YEARJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECANNUAL
197200001752167605000301
19730003214518424267200645
197400039401189240000302
19750000481082631340000553
1976000189184100998100419
19770005576416815638000488
1978000046831981868000521
19790001156923215046600519
1980000056419314551000458
19810000388017210111000402
1982000011171718731000317
1983000029317917293500544
198400001511713916528000464
1985000016271849336100357
19860000443711810923000331
1987000145641989621000425
1988000019812622387400611
19890000178715314150000448
19900001008021017030800508
19910002448415716629400486
1992000215669010552000330
1993000079021217649000534
199400001814326910411000545
1995000098426415922000538
19960002156512214948000401
19970000211314911928300414
19980050138015716536000456
19990000915722811276000582
20000000201069310732000358
200100051812310122632000505
SNOWFALL (inches) 2001 CONCORD, NH (CON)
YEARJULAUGSEPOCTNOVDECJANFEBMARAPRMAYJUNTOTAL
1972–730.00.00.00.012.923.213.15.60.13.40.00.058.3
1973–740.00.00.00.0T6.615.47.06.53.90.00.039.4
1974–750.00.00.00.02.918.319.517.14.75.50.00.068.0
1975–760.00.00.00.02.225.114.78.424.3T0.00.074.7
1976–770.00.00.0T3.111.637.111.722.30.5T0.086.3
1977–780.00.00.00.01.520.237.113.511.50.4T0.084.2
1978–790.00.00.00.010.516.242.34.50.25.10.00.078.8
1979–800.00.00.01.3T2.13.111.98.6T0.00.027.0
1980–810.00.00.0T9.49.89.220.95.4T0.00.054.7
1981–820.00.00.00.0T33.026.29.06.515.30.00.090.0
1982–830.00.00.00.01.33.69.020.84.0TT0.038.7
1983–840.00.00.00.0T17.520.412.725.0TT0.075.6
1984–850.00.00.00.0T16.511.611.012.41.00.00.052.5
1985–860.00.00.00.08.311.215.111.54.4TT0.050.5
1986–870.00.00.00.014.47.745.40.67.09.40.00.084.5
1987–880.00.00.00.05.812.019.323.74.60.10.00.065.5
1988–890.00.00.0T0.55.05.67.010.20.8T0.029.1
1989–900.00.00.00.04.712.023.122.01.3T0.00.063.1
1990–910.00.00.00.00.68.811.26.86.00.20.00.033.6
1991–920.00.00.00.01.313.53.85.36.84.50.00.035.2
1992–930.00.0TT1.110.919.724.035.86.60.0T98.1
1993–940.00.00.0T0.210.036.814.423.6T0.00.085.0
1994–950.00.00.00.04.33.28.118.20.7T0.00.034.5
1995–960.00.00.00.07.028.027.315.614.3T0.0
1996–970.00.00.00.02.220.014.314.122.73.40.00.076.7
1997–980.00.00.00.012.417.316.33.39.60.00.00.058.9
1998–990.00.00.00.00.65.518.01.912.5T0.00.038.5
1999–000.00.00.00.0TT16.615.1
2000–0113.520.937.5T0.00.0
2001–0.00.00.00.00.06.0
POR=58 YRS0.00.0T0.13.813.317.614.111.52.50.1T63.0

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