2001 San Juan, Puerto Rico (SJU)

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2001 SAN JUAN, PUERTO RICO (SJU)

San Juan, located on the north coast of the island of Puerto Rico, is surrounded by the waters of the Atlantic Ocean and San Juan Bay. Local custom assigns the name San Juan to the old city which lies right on the coast, but the modern metropolitan area extends inland about 12 miles. These inland sections have a temperature and rainfall regime significantly different from the coastal area. Isla Verde Airport, where weather observations are made, lies on the coast about 7 miles east of old San Juan. The surrounding terrain is level with a gradual upslope inland. Mountain ranges, with peak elevations of 4,000 feet, extend east and west through the central portion of Puerto Rico, and are located 15 to 20 miles east and south of San Juan. These mountain ranges have a decided influence on the rainfall of the San Juan metropolitan area, and on the entire island in general.

The climate is tropical maritime, characteristic of all tropical islands. The predominant easterly trade winds, modified by local effects such as the land and sea breeze and the particular island topography, are a primary feature of the climate of San Juan and have a significant influence on the temperature and rainfall. During daylight hours the wind blows almost constantly off the ocean. Usually, after sunset the wind shifts to the south or southeast, off land. This daily wind variation is a contributing factor to the delightful climate of the city. The annual temperature range is small with about a 5–6 degree difference between the temperatures of the warmest and coldest months. The inland sectors have warmer afternoons and cooler nights. In the interior mountain and valley regions even greater daily and annual ranges of temperature occur. The highest temperatures recorded in Puerto Rico have exceeded 105 degrees and the lowest have been near 40. Sea water temperatures range from 78 degrees in March to about 83 degrees in September.

Although rainfall in San Juan is nearly 60 inches, the geographical distribution of rainfall over the island shows the heaviest rainfall, of about 180 inches per year, in the Luquillo Range, only 23 miles distant from San Juan. The driest area, with annual rainfall of 30 to 35 inches, is located in the southwest corner of the island. Rain showers occur mostly in the afternoon and at night. The nocturnal showers, usually light, are a characteristic feature of the San Juan rainfall pattern. Rainfall is generally of the brief showery type except for the continuous rains occuring with the passage of tropical disturbances, or when the trailing edge of a cold front out of the United States reaches Puerto Rico. This normally occurs from about November to April.

Puerto Rico is in the tropical hurricane region of the eastern Caribbean. The hurricane season begins June 1 and ends November 30. Only a few hurricanes have passed close enough to San Juan to produce hurricane force winds or damage.

Mild temperatures, refreshing sea breezes in the daytime, plenty of sunshine, and adequate rainfall make the climate of San Juan most enjoyable for tourists and residents alike.

NORMALS, MEANS, AND EXTREMES

SAN JUAN, PR (SJU)

LATITUDE:    LONGITUDE:    ELEVATION (FT):    TIME ZONE:    WBAN: 11641

18 26′ 29″ N  66 00′ 08″ W  GRND:  7  BARO:  10  ATLANTIC (UTC + 4)

ELEMENTPORJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECYEAR
TEMPERATURE FNORMAL DAILY MAXIMUM3083.283.684.485.887.288.688.588.788.888.385.983.886.4
MEAN DAILY MAXIMUM4683.283.684.685.887.188.588.488.888.888.485.983.986.4
HIGHEST DAILY MAXIMUM4792969697969795979798969498
YEAR OF OCCURRENCE198319831983198319801988198119801981198119811989OCT 1981
MEAN OF EXTREME MAXS.4687.287.889.791.292.192.791.892.292.692.690.087.690.6
NORMAL DAILY MINIMUM3070.870.671.672.974.576.176.876.776.275.574.072.474.0
MEAN DAILY MINIMUM4670.570.471.172.774.375.876.576.576.075.273.772.073.7
LOWEST DAILY MINIMUM4761626064666969706946666346
YEAR OF OCCURRENCE196219681957196819621957195919561960200119691964OCT 2001
MEAN OF EXTREME MINS.4666.066.166.968.971.172.973.173.473.271.770.168.270.1
NORMAL DRY BULB3077.077.178.079.480.982.382.682.782.581.980.078.180.2
MEAN DRY BULB4676.877.077.979.380.782.282.482.682.481.879.978.180.1
MEAN WET BULB1671.370.771.172.970.871.572.577.176.676.074.572.673.1
MEAN DEW POINT1668.667.767.969.868.369.170.174.874.373.972.370.170.6
NORMAL NO. DAYS WITH:
MAXIMUM 90300.40.91.93.66.29.48.810.311.19.21.90.664.3
MAXIMUM 32300.00.00.00.00.00.00.00.00.00.00.00.00.0
MINIMUM 32300.00.00.00.00.00.00.00.00.00.00.00.00.0
MINIMUM 0300.00.00.00.00.00.00.00.00.00.00.00.00.0
H/CNORMAL HEATING DEG. DAYS300000000000000
NORMAL COOLING DEG. DAYS303723394034324935195465495255244504065558
RHNORMAL (PERCENT)3074727171757676767677767575
HOUR 02 LST3080797879838483848484838182
HOUR 08 LST3080797674767778797980808078
HOUR 14 LST3063626061656666676766676565
HOUR 20 LST3075737273767778787879777676
SPERCENT POSSIBLE SUNSHINE4669707672646569686264606267
W/OMEAN NO. DAYS WITH:
HEAVY FOG(VISBY 1/4 MI)460.00.00.00.00.00.00.00.00.00.00.00.00.0
THUNDERSTORMS460.30.30.31.04.44.95.16.18.37.73.20.942.5
CLOUDINESSMEAN:
SUNRISE-SUNSET (OKTAS)413.94.03.94.35.14.84.64.54.84.74.44.24.4
MIDNIGHT-MIDNIGHT (OKTAS)323.53.63.63.74.54.14.24.04.24.04.03.83.9
MEAN NO. DAYS WITH:
CLEAR419.07.59.47.53.74.45.25.54.04.75.46.773.0
PARTLY CLOUDY4118.016.317.216.415.515.817.217.416.617.017.618.2203.2
CLOUDY414.04.44.46.111.89.88.68.19.49.46.96.189.0
PRMEAN STATION PRESSURE(IN)2729.9729.9729.9529.9229.9229.9629.9829.9429.9029.8729.8929.9429.93
MEAN SEA-LEVEL PRES. (IN)1630.0430.0330.0129.9729.9730.0230.0430.0029.9529.9229.9330.0129.99
WINDSMEAN SPEED (MPH)337.98.38.68.58.08.79.48.57.46.57.37.78.1
PREVAIL. DIR (TENS OF DEGS)2509090707070909070709070707
MAXIMUM 2-MINUTE:
SPEED (MPH)528293226263228347937333079
DIR. (TENS OF DEGS)05060707070707040504360705
YEAR OF OCCURRENCE200019971997200019971998199719981998200119992000SEP 1998
MAXIMUM 5-SECOND:
SPEED (MPH)537403632304537479343393693
DIR. (TENS OF DEGS)02060606140607070704360707
YEAR OF OCCURRENCE200020011997199920011998199719981998200119992000SEP 1998
PRECIPITATIONNORMAL (IN)302.812.152.353.765.934.004.375.325.285.715.944.7252.34
MAXIMUM MONTHLY (IN)477.606.695.4110.3714.9910.969.3511.7615.1515.0615.9616.8116.81
YEAR OF OCCURRENCE197719821958198819651965196119551996197019791981DEC 1981
MINIMUM MONTHLY (IN)470.610.200.720.080.440.291.121.831.731.171.910.680.08
YEAR OF OCCURRENCE197819831970199719721985197419941987197919801963APR 1997
MAXIMUM IN 24 HOURS (IN)475.082.753.917.204.743.552.915.308.845.047.078.408.84
YEAR OF OCCURRENCE196919891969198819861965199320001989198519791981SEP 1989
NORMAL NO. DAYS WITH:
PRECIPITATION 0.013017.313.012.612.116.114.918.818.616.717.517.618.7193.9
PRECIPITATION 1.00300.20.20.40.81.70.81.01.01.21.21.31.211.0
SNOWFALLNORMAL (IN)300.00.00.00.00.00.00.00.00.00.00.00.00.0
MAXIMUM MONTHLY (IN)470.00.00.00.00.00.00.00.0T0.00.00.0T
YEAR OF OCCURRENCE1989SEP 1989
MAXIMUM IN 24 HOURS (IN)470.00.00.00.00.00.00.00.0T0.00.00.0T
YEAR OF OCCURRENCE1989SEP 1989
MAXIMUM SNOW DEPTH (IN)450000000000000
YEAR OF OCCURRENCE
NORMAL NO. DAYS WITH:
SNOWFALL 1.0300.00.00.00.00.00.00.00.00.00.00.00.00.0
PRECIPITATION (inches) 2001 SAN JUAN, PR (SJU)
YEARJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECANNUAL
19722.762.003.402.790.441.582.243.063.685.462.787.5337.72
19732.270.924.668.480.484.712.447.003.133.293.014.1644.55
19742.920.821.921.202.422.341.126.573.678.236.553.9241.68
19752.690.711.131.011.042.643.354.089.296.6010.907.8251.26
19761.502.182.053.942.962.962.485.1211.447.692.772.1147.20
19777.601.021.730.964.041.494.644.424.715.9412.443.8252.81
19780.611.563.528.277.142.863.463.216.344.885.402.6149.86
19791.291.802.254.2812.135.766.619.3810.111.1715.963.8174.55
19801.751.671.472.555.191.312.193.174.856.711.913.1835.95
19812.552.724.392.8911.025.487.043.322.989.324.9416.8173.46
19822.536.690.981.0110.265.242.331.932.872.064.344.7645.00
19830.690.201.478.543.851.916.535.152.754.063.253.5041.90
19841.963.130.820.283.756.852.666.043.165.105.654.6944.09
19852.802.401.841.025.950.292.854.335.4411.104.542.8045.36
19862.181.131.618.9312.801.521.945.191.988.545.873.5955.28
19872.161.205.178.8812.177.073.262.481.732.707.497.6962.00
19883.832.271.7610.376.061.454.0211.315.494.125.684.0760.43
19892.966.053.392.634.882.975.547.8814.832.094.952.5060.67
19904.563.023.141.052.444.325.763.422.238.655.335.0348.95
19912.572.261.991.763.232.773.301.945.001.846.162.7135.53
19924.031.191.472.128.765.554.384.005.351.7411.984.7255.29
19932.350.510.786.554.485.467.343.014.362.784.343.0044.96
19943.391.691.382.751.694.493.581.835.303.528.323.0440.98
19953.693.571.292.989.474.664.935.157.176.113.093.8455.95
19965.742.442.065.042.396.027.646.9415.152.557.983.2967.24
19974.014.581.830.083.380.984.756.863.566.821.02
19987.293.723.484.143.673.257.187.8010.476.826.747.9972.55
19993.242.740.752.533.995.535.817.345.827.389.846.1561.12
20002.371.010.781.204.722.973.679.522.963.733.763.0839.77
20012.913.271.592.275.902.013.576.445.055.006.2511.7956.05
POR=51 YRS3.152.380.651.463.632.493.783.336.501.903.271.6334.17
AVERAGE TEMPERATURE (F) 2001 SAN JUAN, PR (SJU)
YEARJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECANNUAL
197277.777.878.780.181.783.883.983.482.982.681.179.281.1
197378.978.378.680.082.983.283.483.282.783.580.777.981.1
197477.378.078.579.681.483.483.783.282.982.580.078.380.7
197576.977.278.479.681.082.983.082.782.181.679.877.580.2
197676.376.676.878.580.581.783.183.583.382.580.978.380.2
197777.077.678.380.280.981.980.681.081.181.980.379.380.0
197878.379.279.880.180.882.383.183.283.982.781.879.681.2
197978.578.777.879.481.383.883.583.081.883.080.678.780.8
198078.278.679.280.883.885.185.285.184.584.482.280.782.3
198179.879.480.980.383.484.285.083.884.383.381.678.782.1
198278.577.878.080.481.082.983.384.684.683.880.278.081.1
198378.579.982.281.883.285.484.284.084.383.681.479.982.4
198478.177.880.281.881.182.482.682.682.281.378.777.380.5
198576.177.376.778.380.483.083.583.481.779.679.076.879.7
198675.576.077.479.079.181.682.082.282.581.479.177.779.5
198776.777.478.081.281.681.782.783.783.883.380.679.780.9
198876.976.677.880.482.484.383.682.882.281.679.876.980.4
198976.276.076.178.880.381.281.882.382.381.780.079.279.7
199077.176.476.579.181.882.482.682.983.482.180.777.580.2
199177.077.878.679.281.083.283.183.983.382.479.977.080.5
199277.178.278.980.881.383.482.482.782.384.080.879.380.9
199377.378.579.380.382.183.382.884.283.082.780.978.981.1
199477.978.079.379.782.882.882.983.883.382.881.179.781.2
199578.078.777.280.681.583.384.284.584.982.380.980.081.3
199678.277.979.179.180.381.381.681.881.881.678.876.779.9
199776.276.076.680.381.583.483.183.183.282.480.980.180.6
199878.778.778.279.681.783.182.683.782.882.280.278.680.8
199976.975.477.779.582.482.181.582.783.181.579.876.980.0
200075.776.776.679.480.682.082.982.882.081.879.578.479.9
200177.376.979.280.282.782.882.983.282.982.179.478.380.7
POR=51 YRS76.676.877.679.080.682.082.282.582.281.679.777.979.9

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 SAN JUAN, PR (SJU)
1983-840000000000000
1984-850000000000000
1985-860000000000000
1986-870000000000000
1987-880000000000000
1988-890000000000000
1989-900000000000000
1990-910000000000000
1991-920000000000000
1992-930000000000000
1993-940000000000000
1994-950000000000000
1995-960000000000000
1996-970000000000000
1997-980000000000000
1998-990000000000000
1999-000000000000000
2000-010000000000000
2001-000000
COOLING DEGREE DAYS (base 65 F) 2001 SAN JUAN, PR (SJU)
YEARJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECANNUAL
19724003764314585255695925785435544904465962
19734383794284585625535785705395794754065965
19743903684244425115585865755445494554185820
19753753464204465015435655565215194503955637
19763573423754134855065665795575484854195632
19773823604194634995144915024875324694525570
19784204044644624995265665705755555134596013
19794263934044365125715825645115694774325877
19804144024464795906106336285916085224946417
19814674074994685785846265875885745054296312
19824233644124705045435736155935904664055958
19834264245415095736216045935835825024686426
19844153774795085035285535535225174173895761
19853523493684034835475795775084594293715425
19863293153904284445015355385345174294015361
19873663544074905215085565885715754774645877
19883773414034705475875815585235224533755737
19893543133534214824955295435255264564435440
19903833253624305265265515615595394783925632
19913793634284305035515715935585474553805758
19923833934354795125565475555245964824545916
19933913834504695355575616035505574834405979
19944043704494485595415635925565624934615998
19954123893874755185576026116035454864726057
19964143814444304804955195295105244213725519
19973533163694675185615695675555454854735778
19984303914154465235505555895385414624285868
19993742974024435475155195585495164493795548
20003393453664434925175605575165304434245532
20013883424484645555405635695445354374215806
SNOWFALL (inches) 2001 SAN JUAN, PR (SJU)
YEARJULAUGSEPOCTNOVDECJANFEBMARAPRMAYJUNTOTAL
1972-730.00.00.00.00.00.00.00.00.00.00.00.00.0
1973-740.00.00.00.00.00.00.00.00.00.00.00.00.0
1974-750.00.00.00.00.00.00.00.00.00.00.00.00.0
1975-760.00.00.00.00.00.00.00.00.00.00.00.00.0
1976-770.00.00.00.00.00.00.00.00.00.00.00.00.0
1977-780.00.00.00.00.00.00.00.00.00.00.00.00.0
1978-790.00.00.00.00.00.00.00.00.00.00.00.00.0
1979-800.00.00.00.00.00.00.00.00.00.00.00.00.0
1980-810.00.00.00.00.00.00.00.00.00.00.00.00.0
1981-820.00.00.00.00.00.00.00.00.00.00.00.00.0
1982-830.00.00.00.00.00.00.00.00.00.00.00.00.0
1983-840.00.00.00.00.00.00.00.00.00.00.00.00.0
1984-850.00.00.00.00.00.00.00.00.00.00.00.00.0
1985-860.00.00.00.00.00.00.00.00.00.00.00.00.0
1986-870.00.00.00.00.00.00.00.00.00.00.00.00.0
1987-880.00.00.00.00.00.00.00.00.00.00.00.00.0
1988-890.00.00.00.00.00.00.00.00.00.00.00.00.0
1989-900.00.0T0.00.00.00.00.00.00.00.00.0T
1990-910.00.00.00.00.00.00.00.00.00.00.00.00.0
1991-920.00.00.00.00.00.00.00.00.00.00.00.00.0
1992-930.00.00.00.00.00.00.00.00.00.00.00.00.0
1993-940.00.00.00.00.00.00.00.00.00.00.00.00.0
1994-950.00.00.00.00.00.00.00.00.00.00.00.00.0
1995-960.00.00.00.00.00.00.00.00.00.00.00.00.0
1996-970.00.00.00.00.00.00.00.00.00.00.00.00.0
1997-980.00.00.00.00.00.00.00.00.00.00.00.00.0
1998-990.00.00.00.00.00.00.00.00.00.00.00.00.0
1999-000.00.00.00.00.00.00.00.00.00.00.00.00.0
2000-010.00.00.00.00.00.00.00.00.00.00.00.00.0
2001-0.00.00.00.00.00.0
POR=45 YRS0.00.0T0.00.00.00.00.00.00.00.00.0T

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