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)

2001 San Juan, Puerto Rico (SJU)

ELEMENT POR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC YEAR
TEMPERATURE F NORMAL DAILY MAXIMUM 30 83.2 83.6 84.4 85.8 87.2 88.6 88.5 88.7 88.8 88.3 85.9 83.8 86.4
MEAN DAILY MAXIMUM 46 83.2 83.6 84.6 85.8 87.1 88.5 88.4 88.8 88.8 88.4 85.9 83.9 86.4
HIGHEST DAILY MAXIMUM 47 92 96 96 97 96 97 95 97 97 98 96 94 98
YEAR OF OCCURRENCE 1983 1983 1983 1983 1980 1988 1981 1980 1981 1981 1981 1989 OCT 1981
MEAN OF EXTREME MAXS. 46 87.2 87.8 89.7 91.2 92.1 92.7 91.8 92.2 92.6 92.6 90.0 87.6 90.6
NORMAL DAILY MINIMUM 30 70.8 70.6 71.6 72.9 74.5 76.1 76.8 76.7 76.2 75.5 74.0 72.4 74.0
MEAN DAILY MINIMUM 46 70.5 70.4 71.1 72.7 74.3 75.8 76.5 76.5 76.0 75.2 73.7 72.0 73.7
LOWEST DAILY MINIMUM 47 61 62 60 64 66 69 69 70 69 46 66 63 46
YEAR OF OCCURRENCE 1962 1968 1957 1968 1962 1957 1959 1956 1960 2001 1969 1964 OCT 2001
MEAN OF EXTREME MINS. 46 66.0 66.1 66.9 68.9 71.1 72.9 73.1 73.4 73.2 71.7 70.1 68.2 70.1
NORMAL DRY BULB 30 77.0 77.1 78.0 79.4 80.9 82.3 82.6 82.7 82.5 81.9 80.0 78.1 80.2
MEAN DRY BULB 46 76.8 77.0 77.9 79.3 80.7 82.2 82.4 82.6 82.4 81.8 79.9 78.1 80.1
MEAN WET BULB 16 71.3 70.7 71.1 72.9 70.8 71.5 72.5 77.1 76.6 76.0 74.5 72.6 73.1
MEAN DEW POINT 16 68.6 67.7 67.9 69.8 68.3 69.1 70.1 74.8 74.3 73.9 72.3 70.1 70.6
NORMAL NO. DAYS WITH:
MAXIMUM 90 30 0.4 0.9 1.9 3.6 6.2 9.4 8.8 10.3 11.1 9.2 1.9 0.6 64.3
MAXIMUM 32 30 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
MINIMUM 32 30 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
MINIMUM 0 30 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
H/C NORMAL HEATING DEG. DAYS 30 0 0 0 0 0 0 0 0 0 0 0 0 0
NORMAL COOLING DEG. DAYS 30 372 339 403 432 493 519 546 549 525 524 450 406 5558
RH NORMAL (PERCENT) 30 74 72 71 71 75 76 76 76 76 77 76 75 75
HOUR 02 LST 30 80 79 78 79 83 84 83 84 84 84 83 81 82
HOUR 08 LST 30 80 79 76 74 76 77 78 79 79 80 80 80 78
HOUR 14 LST 30 63 62 60 61 65 66 66 67 67 66 67 65 65
HOUR 20 LST 30 75 73 72 73 76 77 78 78 78 79 77 76 76
S PERCENT POSSIBLE SUNSHINE 46 69 70 76 72 64 65 69 68 62 64 60 62 67
W/O MEAN NO. DAYS WITH:
HEAVY FOG(VISBY 1/4 MI) 46 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
THUNDERSTORMS 46 0.3 0.3 0.3 1.0 4.4 4.9 5.1 6.1 8.3 7.7 3.2 0.9 42.5
CLOUDINESS MEAN:
SUNRISE-SUNSET (OKTAS) 41 3.9 4.0 3.9 4.3 5.1 4.8 4.6 4.5 4.8 4.7 4.4 4.2 4.4
MIDNIGHT-MIDNIGHT (OKTAS) 32 3.5 3.6 3.6 3.7 4.5 4.1 4.2 4.0 4.2 4.0 4.0 3.8 3.9
MEAN NO. DAYS WITH:
CLEAR 41 9.0 7.5 9.4 7.5 3.7 4.4 5.2 5.5 4.0 4.7 5.4 6.7 73.0
PARTLY CLOUDY 41 18.0 16.3 17.2 16.4 15.5 15.8 17.2 17.4 16.6 17.0 17.6 18.2 203.2
CLOUDY 41 4.0 4.4 4.4 6.1 11.8 9.8 8.6 8.1 9.4 9.4 6.9 6.1 89.0
PR MEAN STATION PRESSURE(IN) 27 29.97 29.97 29.95 29.92 29.92 29.96 29.98 29.94 29.90 29.87 29.89 29.94 29.93
MEAN SEA-LEVEL PRES. (IN) 16 30.04 30.03 30.01 29.97 29.97 30.02 30.04 30.00 29.95 29.92 29.93 30.01 29.99
WINDS MEAN SPEED (MPH) 33 7.9 8.3 8.6 8.5 8.0 8.7 9.4 8.5 7.4 6.5 7.3 7.7 8.1
PREVAIL. DIR (TENS OF DEGS) 25 09 09 07 07 07 09 09 07 07 09 07 07 07
MAXIMUM 2-MINUTE:
SPEED (MPH) 5 28 29 32 26 26 32 28 34 79 37 33 30 79
DIR. (TENS OF DEGS) 05 06 07 07 07 07 07 04 05 04 36 07 05
YEAR OF OCCURRENCE 2000 1997 1997 2000 1997 1998 1997 1998 1998 2001 1999 2000 SEP 1998
MAXIMUM 5-SECOND:
SPEED (MPH) 5 37 40 36 32 30 45 37 47 93 43 39 36 93
DIR. (TENS OF DEGS) 02 06 06 06 14 06 07 07 07 04 36 07 07
YEAR OF OCCURRENCE 2000 2001 1997 1999 2001 1998 1997 1998 1998 2001 1999 2000 SEP 1998
PRECIPITATION NORMAL (IN) 30 2.81 2.15 2.35 3.76 5.93 4.00 4.37 5.32 5.28 5.71 5.94 4.72 52.34
MAXIMUM MONTHLY (IN) 47 7.60 6.69 5.41 10.37 14.99 10.96 9.35 11.76 15.15 15.06 15.96 16.81 16.81
YEAR OF OCCURRENCE 1977 1982 1958 1988 1965 1965 1961 1955 1996 1970 1979 1981 DEC 1981
MINIMUM MONTHLY (IN) 47 0.61 0.20 0.72 0.08 0.44 0.29 1.12 1.83 1.73 1.17 1.91 0.68 0.08
YEAR OF OCCURRENCE 1978 1983 1970 1997 1972 1985 1974 1994 1987 1979 1980 1963 APR 1997
MAXIMUM IN 24 HOURS (IN) 47 5.08 2.75 3.91 7.20 4.74 3.55 2.91 5.30 8.84 5.04 7.07 8.40 8.84
YEAR OF OCCURRENCE 1969 1989 1969 1988 1986 1965 1993 2000 1989 1985 1979 1981 SEP 1989
NORMAL NO. DAYS WITH:
PRECIPITATION 0.01 30 17.3 13.0 12.6 12.1 16.1 14.9 18.8 18.6 16.7 17.5 17.6 18.7 193.9
PRECIPITATION 1.00 30 0.2 0.2 0.4 0.8 1.7 0.8 1.0 1.0 1.2 1.2 1.3 1.2 11.0
SNOWFALL NORMAL (IN) 30 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
MAXIMUM MONTHLY (IN) 47 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 T 0.0 0.0 0.0 T
YEAR OF OCCURRENCE 1989 SEP 1989
MAXIMUM IN 24 HOURS (IN) 47 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 T 0.0 0.0 0.0 T
YEAR OF OCCURRENCE 1989 SEP 1989
MAXIMUM SNOW DEPTH (IN) 45 0 0 0 0 0 0 0 0 0 0 0 0 0
YEAR OF OCCURRENCE
NORMAL NO. DAYS WITH:
SNOWFALL 1.0 30 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0

2001 San Juan, Puerto Rico (SJU)

PRECIPITATION (inches) 2001 SAN JUAN, PR (SJU)
YEAR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANNUAL
1972 2.76 2.00 3.40 2.79 0.44 1.58 2.24 3.06 3.68 5.46 2.78 7.53 37.72
1973 2.27 0.92 4.66 8.48 0.48 4.71 2.44 7.00 3.13 3.29 3.01 4.16 44.55
1974 2.92 0.82 1.92 1.20 2.42 2.34 1.12 6.57 3.67 8.23 6.55 3.92 41.68
1975 2.69 0.71 1.13 1.01 1.04 2.64 3.35 4.08 9.29 6.60 10.90 7.82 51.26
1976 1.50 2.18 2.05 3.94 2.96 2.96 2.48 5.12 11.44 7.69 2.77 2.11 47.20
1977 7.60 1.02 1.73 0.96 4.04 1.49 4.64 4.42 4.71 5.94 12.44 3.82 52.81
1978 0.61 1.56 3.52 8.27 7.14 2.86 3.46 3.21 6.34 4.88 5.40 2.61 49.86
1979 1.29 1.80 2.25 4.28 12.13 5.76 6.61 9.38 10.11 1.17 15.96 3.81 74.55
1980 1.75 1.67 1.47 2.55 5.19 1.31 2.19 3.17 4.85 6.71 1.91 3.18 35.95
1981 2.55 2.72 4.39 2.89 11.02 5.48 7.04 3.32 2.98 9.32 4.94 16.81 73.46
1982 2.53 6.69 0.98 1.01 10.26 5.24 2.33 1.93 2.87 2.06 4.34 4.76 45.00
1983 0.69 0.20 1.47 8.54 3.85 1.91 6.53 5.15 2.75 4.06 3.25 3.50 41.90
1984 1.96 3.13 0.82 0.28 3.75 6.85 2.66 6.04 3.16 5.10 5.65 4.69 44.09
1985 2.80 2.40 1.84 1.02 5.95 0.29 2.85 4.33 5.44 11.10 4.54 2.80 45.36
1986 2.18 1.13 1.61 8.93 12.80 1.52 1.94 5.19 1.98 8.54 5.87 3.59 55.28
1987 2.16 1.20 5.17 8.88 12.17 7.07 3.26 2.48 1.73 2.70 7.49 7.69 62.00
1988 3.83 2.27 1.76 10.37 6.06 1.45 4.02 11.31 5.49 4.12 5.68 4.07 60.43
1989 2.96 6.05 3.39 2.63 4.88 2.97 5.54 7.88 14.83 2.09 4.95 2.50 60.67
1990 4.56 3.02 3.14 1.05 2.44 4.32 5.76 3.42 2.23 8.65 5.33 5.03 48.95
1991 2.57 2.26 1.99 1.76 3.23 2.77 3.30 1.94 5.00 1.84 6.16 2.71 35.53
1992 4.03 1.19 1.47 2.12 8.76 5.55 4.38 4.00 5.35 1.74 11.98 4.72 55.29
1993 2.35 0.51 0.78 6.55 4.48 5.46 7.34 3.01 4.36 2.78 4.34 3.00 44.96
1994 3.39 1.69 1.38 2.75 1.69 4.49 3.58 1.83 5.30 3.52 8.32 3.04 40.98
1995 3.69 3.57 1.29 2.98 9.47 4.66 4.93 5.15 7.17 6.11 3.09 3.84 55.95
1996 5.74 2.44 2.06 5.04 2.39 6.02 7.64 6.94 15.15 2.55 7.98 3.29 67.24
1997 4.01 4.58 1.83 0.08 3.38 0.98 4.75 6.86 3.56 6.82 1.02
1998 7.29 3.72 3.48 4.14 3.67 3.25 7.18 7.80 10.47 6.82 6.74 7.99 72.55
1999 3.24 2.74 0.75 2.53 3.99 5.53 5.81 7.34 5.82 7.38 9.84 6.15 61.12
2000 2.37 1.01 0.78 1.20 4.72 2.97 3.67 9.52 2.96 3.73 3.76 3.08 39.77
2001 2.91 3.27 1.59 2.27 5.90 2.01 3.57 6.44 5.05 5.00 6.25 11.79 56.05
POR=51 YRS 3.15 2.38 0.65 1.46 3.63 2.49 3.78 3.33 6.50 1.90 3.27 1.63 34.17

2001 San Juan, Puerto Rico (SJU)

AVERAGE TEMPERATURE (F) 2001 SAN JUAN, PR (SJU)
YEAR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANNUAL
1972 77.7 77.8 78.7 80.1 81.7 83.8 83.9 83.4 82.9 82.6 81.1 79.2 81.1
1973 78.9 78.3 78.6 80.0 82.9 83.2 83.4 83.2 82.7 83.5 80.7 77.9 81.1
1974 77.3 78.0 78.5 79.6 81.4 83.4 83.7 83.2 82.9 82.5 80.0 78.3 80.7
1975 76.9 77.2 78.4 79.6 81.0 82.9 83.0 82.7 82.1 81.6 79.8 77.5 80.2
1976 76.3 76.6 76.8 78.5 80.5 81.7 83.1 83.5 83.3 82.5 80.9 78.3 80.2
1977 77.0 77.6 78.3 80.2 80.9 81.9 80.6 81.0 81.1 81.9 80.3 79.3 80.0
1978 78.3 79.2 79.8 80.1 80.8 82.3 83.1 83.2 83.9 82.7 81.8 79.6 81.2
1979 78.5 78.7 77.8 79.4 81.3 83.8 83.5 83.0 81.8 83.0 80.6 78.7 80.8
1980 78.2 78.6 79.2 80.8 83.8 85.1 85.2 85.1 84.5 84.4 82.2 80.7 82.3
1981 79.8 79.4 80.9 80.3 83.4 84.2 85.0 83.8 84.3 83.3 81.6 78.7 82.1
1982 78.5 77.8 78.0 80.4 81.0 82.9 83.3 84.6 84.6 83.8 80.2 78.0 81.1
1983 78.5 79.9 82.2 81.8 83.2 85.4 84.2 84.0 84.3 83.6 81.4 79.9 82.4
1984 78.1 77.8 80.2 81.8 81.1 82.4 82.6 82.6 82.2 81.3 78.7 77.3 80.5
1985 76.1 77.3 76.7 78.3 80.4 83.0 83.5 83.4 81.7 79.6 79.0 76.8 79.7
1986 75.5 76.0 77.4 79.0 79.1 81.6 82.0 82.2 82.5 81.4 79.1 77.7 79.5
1987 76.7 77.4 78.0 81.2 81.6 81.7 82.7 83.7 83.8 83.3 80.6 79.7 80.9
1988 76.9 76.6 77.8 80.4 82.4 84.3 83.6 82.8 82.2 81.6 79.8 76.9 80.4
1989 76.2 76.0 76.1 78.8 80.3 81.2 81.8 82.3 82.3 81.7 80.0 79.2 79.7
1990 77.1 76.4 76.5 79.1 81.8 82.4 82.6 82.9 83.4 82.1 80.7 77.5 80.2
1991 77.0 77.8 78.6 79.2 81.0 83.2 83.1 83.9 83.3 82.4 79.9 77.0 80.5
1992 77.1 78.2 78.9 80.8 81.3 83.4 82.4 82.7 82.3 84.0 80.8 79.3 80.9
1993 77.3 78.5 79.3 80.3 82.1 83.3 82.8 84.2 83.0 82.7 80.9 78.9 81.1
1994 77.9 78.0 79.3 79.7 82.8 82.8 82.9 83.8 83.3 82.8 81.1 79.7 81.2
1995 78.0 78.7 77.2 80.6 81.5 83.3 84.2 84.5 84.9 82.3 80.9 80.0 81.3
1996 78.2 77.9 79.1 79.1 80.3 81.3 81.6 81.8 81.8 81.6 78.8 76.7 79.9
1997 76.2 76.0 76.6 80.3 81.5 83.4 83.1 83.1 83.2 82.4 80.9 80.1 80.6
1998 78.7 78.7 78.2 79.6 81.7 83.1 82.6 83.7 82.8 82.2 80.2 78.6 80.8
1999 76.9 75.4 77.7 79.5 82.4 82.1 81.5 82.7 83.1 81.5 79.8 76.9 80.0
2000 75.7 76.7 76.6 79.4 80.6 82.0 82.9 82.8 82.0 81.8 79.5 78.4 79.9
2001 77.3 76.9 79.2 80.2 82.7 82.8 82.9 83.2 82.9 82.1 79.4 78.3 80.7
POR=51 YRS 76.6 76.8 77.6 79.0 80.6 82.0 82.2 82.5 82.2 81.6 79.7 77.9 79.9

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.

2001 San Juan, Puerto Rico (SJU)

HEATING DEGREE DAYS (base 65 F) 2001 SAN JUAN, PR (SJU)
1983-84 0 0 0 0 0 0 0 0 0 0 0 0 0
1984-85 0 0 0 0 0 0 0 0 0 0 0 0 0
1985-86 0 0 0 0 0 0 0 0 0 0 0 0 0
1986-87 0 0 0 0 0 0 0 0 0 0 0 0 0
1987-88 0 0 0 0 0 0 0 0 0 0 0 0 0
1988-89 0 0 0 0 0 0 0 0 0 0 0 0 0
1989-90 0 0 0 0 0 0 0 0 0 0 0 0 0
1990-91 0 0 0 0 0 0 0 0 0 0 0 0 0
1991-92 0 0 0 0 0 0 0 0 0 0 0 0 0
1992-93 0 0 0 0 0 0 0 0 0 0 0 0 0
1993-94 0 0 0 0 0 0 0 0 0 0 0 0 0
1994-95 0 0 0 0 0 0 0 0 0 0 0 0 0
1995-96 0 0 0 0 0 0 0 0 0 0 0 0 0
1996-97 0 0 0 0 0 0 0 0 0 0 0 0 0
1997-98 0 0 0 0 0 0 0 0 0 0 0 0 0
1998-99 0 0 0 0 0 0 0 0 0 0 0 0 0
1999-00 0 0 0 0 0 0 0 0 0 0 0 0 0
2000-01 0 0 0 0 0 0 0 0 0 0 0 0 0
2001- 0 0 0 0 0 0

2001 San Juan, Puerto Rico (SJU)

COOLING DEGREE DAYS (base 65 F) 2001 SAN JUAN, PR (SJU)
YEAR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANNUAL
1972 400 376 431 458 525 569 592 578 543 554 490 446 5962
1973 438 379 428 458 562 553 578 570 539 579 475 406 5965
1974 390 368 424 442 511 558 586 575 544 549 455 418 5820
1975 375 346 420 446 501 543 565 556 521 519 450 395 5637
1976 357 342 375 413 485 506 566 579 557 548 485 419 5632
1977 382 360 419 463 499 514 491 502 487 532 469 452 5570
1978 420 404 464 462 499 526 566 570 575 555 513 459 6013
1979 426 393 404 436 512 571 582 564 511 569 477 432 5877
1980 414 402 446 479 590 610 633 628 591 608 522 494 6417
1981 467 407 499 468 578 584 626 587 588 574 505 429 6312
1982 423 364 412 470 504 543 573 615 593 590 466 405 5958
1983 426 424 541 509 573 621 604 593 583 582 502 468 6426
1984 415 377 479 508 503 528 553 553 522 517 417 389 5761
1985 352 349 368 403 483 547 579 577 508 459 429 371 5425
1986 329 315 390 428 444 501 535 538 534 517 429 401 5361
1987 366 354 407 490 521 508 556 588 571 575 477 464 5877
1988 377 341 403 470 547 587 581 558 523 522 453 375 5737
1989 354 313 353 421 482 495 529 543 525 526 456 443 5440
1990 383 325 362 430 526 526 551 561 559 539 478 392 5632
1991 379 363 428 430 503 551 571 593 558 547 455 380 5758
1992 383 393 435 479 512 556 547 555 524 596 482 454 5916
1993 391 383 450 469 535 557 561 603 550 557 483 440 5979
1994 404 370 449 448 559 541 563 592 556 562 493 461 5998
1995 412 389 387 475 518 557 602 611 603 545 486 472 6057
1996 414 381 444 430 480 495 519 529 510 524 421 372 5519
1997 353 316 369 467 518 561 569 567 555 545 485 473 5778
1998 430 391 415 446 523 550 555 589 538 541 462 428 5868
1999 374 297 402 443 547 515 519 558 549 516 449 379 5548
2000 339 345 366 443 492 517 560 557 516 530 443 424 5532
2001 388 342 448 464 555 540 563 569 544 535 437 421 5806

2001 San Juan, Puerto Rico (SJU)

SNOWFALL (inches) 2001 SAN JUAN, PR (SJU)
YEAR JUL AUG SEP OCT NOV DEC JAN FEB MAR APR MAY JUN TOTAL
1972-73 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
1973-74 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
1974-75 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
1975-76 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
1976-77 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
1977-78 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
1978-79 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
1979-80 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
1980-81 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
1981-82 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
1982-83 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
1983-84 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
1984-85 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
1985-86 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
1986-87 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
1987-88 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
1988-89 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
1989-90 0.0 0.0 T 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 T
1990-91 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
1991-92 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
1992-93 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
1993-94 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
1994-95 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
1995-96 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
1996-97 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
1997-98 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
1998-99 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
1999-00 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
2000-01 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
2001- 0.0 0.0 0.0 0.0 0.0 0.0
POR=45 YRS 0.0 0.0 T 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 T



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2001 San Juan, Puerto Rico (SJU) forum