2001 SAN FRANCISCO, CALIFORNIA INTERNATIONAL AIRPORT (SFO)



The station is located in the central Terminal Building of the San Francisco International Airport, which is on flat filled tideland on the west shore of San Francisco Bay. The bay borders the airport from the north to the south–southeast. San Bruno Mountain, 5 miles to the north–northwest, rises to 1,300 feet. A north–south trending ridge of coastal mountains, 4 miles to the west, varies in elevation from 700 to 1,900 feet, being highest southward along the peninsula. The Pacific Ocean west of the ridge is 6 miles from the airport. A broad gap to the northwest of the station, between San Bruno Mountain and the coastal mountains, allows a strong flow of marine air over the station and dominate the local climate.

San Francisco Airport enjoys a marine–type climate characterized by mild and moderately wet winters and by dry, cool summers. Winter rains, occurring from November through March, account for over 80 percent of the annual rainfall, and measurable precipitation occurs on an average of 10 days per month during this period. However, there are frequent dry periods lasting well over a week. Severe winter storms with gale winds and heavy rains occur only occasionally. Thunderstorms average two a year and may occur in any month.

The daily and annual range in temperature is small. A few frosty mornings occur during the winter but the temperature seldom drops below freezing. Winter temperatures generally rise to the high 50s in the early afternoon.

The summer weather is dominated by a cool sea breeze resulting in an average summer wind speed of nearly 15 mph. Winds are light in the early morning but normally reach 20 to 25 mph in the afternoon.

A sea fog, arriving over the station during the late evening or night as a low cloud, is another persistent feature of the summer weather. This high fog, occasionally producing drizzle or mist, usually disappears during the late forenoon. Despite the morning overcast, summer days are sunny. On the average a total of only 14 days during the four months from June through September are classified as cloudy.

Daytime temperatures are held down both by the morning low overcast and the afternoon strengthening sea breeze, resulting in daily maximum readings averaging about 70 degrees from May through August. However, during these months occasional hot spells, lasting a few days, are experienced without the usual high fog and sea breeze. September, when the sea breeze becomes less pronounced, is the warmest month with highs in the 70s. Low temperatures during the summer are in the mid–50s.

A strong temperature inversion with its base usually about 1,500 feet persists throughout the summer. Inversions close to the ground are infrequent in summer but rather common in fall and winter. As a consequence of these factors and the continued population and economic growth of the area, atmospheric pollution has become a problem of increasing importance.

NORMALS, MEANS, AND EXTREMES

SAN FRANCISCO, CA (SFO)

LATITUDE:    LONGITUDE:     ELEVATION (FT):    TIME ZONE:    WBAN: 23234

37 37′ 11″ N  122 23′ 53″ W  GRND: 86  BARO: 89  PACIFIC (UTC + 8)

2001 San Francisco, California international Airport (SFO)

ELEMENT POR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC YEAR
TEMPERATURE F NORMAL DAILY MAXIMUM 30 55.6 59.4 60.8 63.9 66.5 70.3 71.6 72.3 73.6 70.1 62.4 56.1 65.2
MEAN DAILY MAXIMUM 56 55.6 59.0 60.9 63.8 66.4 69.9 71.2 71.9 73.3 70.1 62.7 56.3 65.1
HIGHEST DAILY MAXIMUM 74 72 78 85 92 97 106 105 100 103 99 85 75 106
YEAR OF OCCURRENCE 1948 1930 1952 1989 1984 1961 1988 1993 1971 1987 1967 1958 JUN 1961
MEAN OF EXTREME MAXS. 56 64.5 68.3 72.9 78.9 84.1 88.4 86.6 86.0 90.1 85.9 74.0 64.6 78.7
NORMAL DAILY MINIMUM 30 41.8 45.0 45.8 47.2 49.7 52.6 53.9 55.0 55.2 51.8 47.1 42.7 49.0
MEAN DAILY MINIMUM 56 42.0 44.6 45.8 47.4 49.9 52.4 53.7 54.6 54.4 51.6 47.1 42.8 48.9
LOWEST DAILY MINIMUM 74 24 25 30 31 36 41 43 42 38 34 25 20 20
YEAR OF OCCURRENCE 1928 1929 1929 1929 1929 1932 1928 1935 1929 1929 1931 1932 DEC 1932
MEAN OF EXTREME MINS. 56 33.5 36.8 38.7 41.3 44.7 48.1 50.0 50.6 49.4 45.0 39.0 34.7 42.7
NORMAL DRY BULB 30 48.7 52.2 53.3 55.6 58.1 61.5 62.7 63.7 64.5 61.0 54.8 49.4 57.1
MEAN DRY BULB 56 48.9 51.8 53.4 55.6 58.3 61.2 62.5 63.3 63.9 60.9 54.9 49.5 57.0
MEAN WET BULB 17 47.3 48.7 50.2 51.2 53.2 55.4 57.0 57.8 57.3 55.2 50.8 46.7 52.6
MEAN DEW POINT 17 44.0 45.1 46.2 46.8 48.7 50.9 53.0 54.2 53.7 50.9 46.4 42.9 48.6
NORMAL NO. DAYS WITH:
MAXIMUM 90 30 0.0 0.0 0.0 0.1 0.4 0.9 0.7 0.3 1.4 0.4 0.0 0.0 4.2
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 1.2 0.1 * 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 1.0 2.3
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 30 505 358 363 287 218 121 92 68 79 135 306 484 3016
NORMAL COOLING DEG. DAYS 30 0 0 0 5 0 16 21 28 64 11 0 0 145
RH NORMAL (PERCENT) 30 78 76 73 71 71 71 73 74 72 72 75 78 74
HOUR 04 LST 30 86 84 81 81 83 84 86 86 83 82 84 85 84
HOUR 10 LST 30 79 75 70 65 63 63 65 67 65 68 72 77 69
HOUR 16 LST 30 66 64 62 59 59 58 59 61 58 59 63 67 61
HOUR 22 LST 30 80 78 77 76 78 79 82 82 78 77 77 80 79
S PERCENT POSSIBLE SUNSHINE
W/O MEAN NO. DAYS WITH:
HEAVY FOG (VISBY 1/4 MI) 64 3.3 2.6 0.4 0.1 0.1 0.0 0.0 0.2 0.6 1.3 2.1 3.0 13.7
THUNDERSTORMS 74 0.4 0.4 0.3 0.2 0.1 0.1 0.1 0.1 0.2 0.3 0.1 0.2 2.5
CLOUDINESS MEAN:
SUNRISE–SUNSET (OKTAS) 55 5.0 5.0 4.6 4.2 3.6 3.0 2.4 2.6 2.6 3.1 4.2 4.7 3.8
MIDNIGHT–MIDNIGHT (OKTAS) 32 4.7 4.9 4.6 3.9 3.4 3.2 2.6 2.8 2.6 3.0 4.0 4.3 3.7
MEAN NO. DAYS WITH:
CLEAR 69 8.5 7.8 9.5 10.8 13.5 16.2 20.3 18.8 17.9 15.5 11.1 9.4 159.3
PARTLY CLOUDY 69 7.5 7.3 8.7 9.3 9.7 8.6 7.5 8.6 8.2 8.9 8.3 7.5 100.1
CLOUDY 69 15.0 13.1 12.8 9.9 7.8 5.2 2.8 3.3 3.6 6.5 10.6 14.1 104.7
PR MEAN STATION PRESSURE(IN) 28 30.09 30.05 30.03 30.03 29.97 29.95 29.95 29.94 29.93 30.00 30.08 30.11 30.01
MEAN SEA–LEVEL PRES. (IN) 17 30.12 30.08 30.06 30.05 30.00 29.96 29.96 29.96 29.94 30.01 30.11 30.13 30.03
WINDS MEAN SPEED (MPH) 43 7.7 9.0 11.0 12.5 13.9 14.1 13.7 12.8 11.4 9.7 8.1 7.7 11.0
PREVAIL. DIR (TENS OF DEGS) 27 14 30 29 29 28 28 30 30 30 30 30 14 30
MAXIMUM 2–MINUTE:
SPEED (MPH) 5 43 44 46 45 46 43 38 37 32 40 46 45 46
DIR. (TENS OF DEGS) 17 27 26 26 26 26 26 26 26 26 24 16 24
YEAR OF OCCURRENCE 1997 2001 2000 2001 1999 1997 1997 1999 1997 1997 2001 2001 NOV 2001
MAXIMUM 5–SECOND:
SPEED (MPH) 5 56 59 51 54 54 53 44 46 39 49 55 55 59
DIR. (TENS OF DEGS) 16 18 26 28 26 26 26 26 25 29 24 16 18
YEAR OF OCCURRENCE 1997 1999 2000 1999 1999 1997 1997 2001 1997 1997 2001 2001 FEB 1999
PRECIPITATION NORMAL (IN) 30 4.35 3.17 3.06 1.37 0.19 0.11 0.03 0.05 0.20 1.22 2.86 3.09 19.70
MAXIMUM MONTHLY (IN) 74 11.26 13.64 9.01 6.36 3.81 0.86 0.35 0.66 2.30 7.30 7.94 12.30 13.64
YEAR OF OCCURRENCE 1993 1998 1958 1958 1957 1967 1977 1976 1959 1962 1973 1955 FEB 1998
MINIMUM MONTHLY (IN) 74 0.24 T T T 0.00 0.00 0.00 0.00 T T 0.00 0.01 0.00
YEAR OF OCCURRENCE 1991 1953 1934 1977 2001 1928 1930 1996 1995 1978 1929 1989 MAY 2001
MAXIMUM IN 24 HOURS (IN) 74 5.71 3.41 2.46 2.66 1.54 0.83 0.35 0.60 2.30 3.74 2.43 3.33 5.71
YEAR OF OCCURRENCE 1982 1998 1982 1958 1957 1967 1977 1997 1959 1962 1994 1955 JAN 1982
NORMAL NO. DAYS WITH:
PRECIPITATION 0.01 30 9.8 8.9 10.4 6.1 2.3 0.7 0.4 0.6 1.4 3.6 8.1 9.4 61.7
PRECIPITATION 1.00 30 1.4 0.8 0.5 0.2 0.0 0.0 0.0 0.0 0.0 0.4 0.6 0.7 4.6
SNOWFALL NORMAL (IN) 30 0.1 T 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 T 0.1
MAXIMUM MONTHLY (IN) 69 1.5 T T 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 1.0 1.5
YEAR OF OCCURRENCE 1962 1996 1995 1932 JAN 1962
MAXIMUM IN 24 HOURS (IN) 69 1.5 T T T 0.0 0.0 0.0 0.0 0.0 0.0 0.0 1.0 1.5
YEAR OF OCCURRENCE 1962 1996 1995 1987 1932 JAN 1962
MAXIMUM SNOW DEPTH (IN) 48 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

2001 San Francisco, California international Airport (SFO)

PRECIPITATION (inches) 2001 SAN FRANCISCO, CALIFORNIA CA (SFO)
YEAR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANNUAL
1972 1.09 1.35 0.18 1.20 T 0.06 T T 0.30 5.24 5.15 2.40 16.97
1973 8.32 6.82 2.93 0.11 0.07 T T T 0.04 1.60 7.94 3.55 31.38
1974 3.21 1.70 4.21 2.32 T 0.14 0.23 T T 0.93 0.50 2.36 15.60
1975 2.60 3.94 5.91 1.66 0.02 0.04 0.13 0.21 T 2.27 0.26 0.21 17.25
1976 0.37 2.13 1.22 0.92 T 0.01 T 0.66 0.30 0.34 1.37 2.70 10.02
1977 2.22 1.04 2.01 T 0.41 T 0.35 T 0.47 0.15 2.20 3.69 12.54
1978 8.90 4.92 4.90 4.50 0.02 T T T 0.26 T 1.67 0.64 25.81
1979 6.61 5.87 2.74 0.69 0.13 T 0.09 T T 2.20 1.94 4.30 24.57
1980 4.85 7.62 2.65 0.90 0.24 0.03 0.10 T T 0.10 0.12 1.73 18.34
1981 5.92 2.21 3.60 0.24 0.07 T T T 0.28 2.35 4.89 3.91 23.47
1982 8.81 2.82 7.63 3.25 T 0.06 T T 0.96 1.95 5.34 3.99 34.81
1983 6.83 6.64 8.50 3.11 0.32 T 0.01 T 0.57 0.10 6.03 6.23 38.34
1984 0.46 1.47 1.36 0.68 T 0.03 T 0.11 0.05 1.96 6.12 1.89 14.13
1985 0.74 2.35 3.30 0.12 0.05 0.29 0.03 0.02 0.18 0.69 3.19 1.61 12.57
1986 4.04 8.09 5.84 0.39 0.15 T 0.01 T 0.47 0.02 0.06 1.66 20.73
1987 2.80 3.52 1.98 0.16 0.06 T T T T 0.93 1.64 4.51 15.60
1988 3.92 0.38 0.05 2.02 0.29 0.60 T T 0.03 0.42 2.31 3.65 13.67
1989 1.25 1.28 4.00 0.78 0.04 0.01 T T 1.24 1.40 1.34 0.01 11.35
1990 3.06 2.28 0.79 0.20 1.55 T 0.01 T 0.20 0.19 0.28 1.79 10.35
1991 0.24 3.76 6.07 0.61 0.21 0.11 T 0.27 0.04 1.73 0.23 2.70 15.97
1992 2.04 6.44 4.12 0.25 T 0.39 0.00 0.14 T 1.12 0.15 6.04 20.69
1993 11.26 4.68 2.34 0.41 0.55 0.16 T T T 0.45 1.47 2.19 23.51
1994 2.50 5.26 0.24 1.12 1.52 0.03 T T 0.10 0.33 5.73 2.49 19.32
1995 8.89 0.38 8.75 1.41 0.93 0.60 T T T 0.03 0.02 6.41 27.42
1996 6.92 6.03 2.89 1.40 1.24 T T 0.00 T 0.76 2.56 6.97 28.77
1997 7.52 0.31 0.25 0.30 0.21 0.24 T 0.60 T 0.68 6.41 3.87 20.39
1998 8.20 13.64 2.05 2.24 2.37 0.03 T 0.00 0.09 0.62 2.43 0.96 32.63
1999 2.96 4.59 2.80 2.18 0.10 0.18 0.00 0.06 0.27 0.46 1.47 0.43 15.50
2000 5.83 8.46 1.74 1.30 0.53 0.14 0.00 0.01 0.07 2.14 0.91 0.44 21.57
2001 3.87 6.12 1.02 1.56 0.00 0.10 0.00 0.00 0.11 0.31 4.51 8.54 26.14
POR=74 YRS 4.47 3.50 2.88 1.33 0.39 0.13 0.02 0.05 0.20 0.97 2.40 3.42 19.76

2001 San Francisco, California international Airport (SFO)

AVERAGE TEMPERATURE (F) 2001 SAN FRANCISCO, CALIFORNIA CA (SFO)
YEAR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANNUAL
1972 45.6 52.0 55.3 55.4 57.6 60.9 64.3 64.0 62.6 61.0 53.2 44.9 56.4
1973 48.0 52.9 51.4 56.7 58.7 63.5 62.1 60.7 63.5 60.7 53.9 50.0 56.8
1974 48.6 49.7 53.4 54.8 56.2 60.4 63.0 63.7 62.5 62.0 53.8 48.6 56.4
1975 47.4 50.9 51.4 50.6 58.4 59.8 61.8 63.0 61.4 58.8 52.2 49.3 55.4
1976 48.5 50.5 51.0 53.3 58.3 63.2 62.5 64.3 63.3 61.3 57.0 48.8 56.8
1977 47.0 53.2 50.9 55.5 55.8 60.4 62.4 64.1 63.5 60.5 55.3 52.3 56.7
1978 52.5 52.8 57.0 54.9 60.4 60.4 61.4 63.2 65.8 61.1 52.5 46.0 57.3
1979 47.5 50.3 54.5 55.5 60.4 61.0 63.8 63.7 67.3 62.6 54.1 50.9 57.6
1980 50.5 54.4 53.0 55.9 56.3 59.9 63.0 61.5 63.2 61.2 55.6 50.7 57.1
1981 51.1 54.0 53.2 56.2 59.0 65.0 61.7 63.0 62.7 58.6 56.3 52.2 57.8
1982 45.1 51.7 51.3 54.6 57.4 59.7 61.7 63.3 64.0 61.1 52.3 48.9 55.9
1983 48.0 53.4 54.1 54.7 57.8 61.5 65.1 66.9 68.3 64.4 55.5 53.4 58.6
1984 51.3 52.9 57.0 56.0 61.8 61.3 65.6 64.4 69.7 60.4 53.8 47.7 58.5
1985 46.4 51.6 51.4 59.0 58.6 65.2 64.8 64.0 63.2 60.7 52.0 47.1 57.0
1986 53.7 56.3 57.1 56.2 58.6 62.5 62.4 61.2 62.9 61.4 57.1 50.3 58.3
1987 49.3 53.3 54.9 59.2 61.6 62.4 63.1 65.1 64.0 63.9 57.0 50.5 58.7
1988 50.6 54.5 56.5 58.1 59.5 62.5 65.3 65.0 63.1 61.4 56.5 50.4 58.6
1989 48.3 48.4 54.9 60.8 59.8 62.7 62.8 64.0 61.4 60.8 56.4 50.1 57.5
1990 49.9 49.2 53.3 58.5 59.0 62.4 64.5 66.3 66.4 63.1 56.0 46.4 57.9
1991 50.1 55.3 52.2 55.7 56.9 59.4 63.7 64.4 62.9 62.8 57.5 50.8 57.6
1992 48.9 56.1 57.4 60.6 63.4 63.6 65.8 63.8 65.3 65.4 56.8 49.8 59.7
1993 49.3 52.5 57.5 58.1 62.2 64.8 64.8 67.3 63.1 63.4 56.3 50.1 59.1
1994 51.5 50.6 56.0 56.8 58.5 61.5 62.1 64.5 64.1 60.1 49.9 48.0 57.0
1995 52.2 54.1 53.9 55.0 57.0 60.8 64.8 63.0 63.2 62.5 58.4 53.7 58.2
1996 51.8 54.9 56.0 59.1 60.4 61.5 63.2 62.7 63.0 60.9 56.3 53.9 58.6
1997 50.9 53.4 56.1 58.2 64.4 62.3 64.0 66.9 68.3 61.8 57.7 51.1 59.6
1998 52.8 52.3 55.0 55.7 57.7 61.6 62.8 64.3 64.3 60.3 54.2 47.0 57.3
1999 49.3 50.4 51.0 54.6 55.5 59.6 61.9 63.8 63.6 62.5 57.1 51.1 56.7
2000 52.4 53.5 54.4 58.2 60.2 62.9 61.4 63.6 66.2 60.0 52.6 51.6 58.1
2001 48.8 51.0 55.7 53.6 62.6 62.6 62.7 63.2 62.9 62.4 57.3 51.7 57.9
POR=74 YRS 48.7 51.5 53.3 55.2 58.0 60.8 62.1 62.7 63.4 60.5 54.6 49.6 56.7

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 Francisco, California international Airport (SFO)

HEATING DEGREE DAYS (base 65 F) 2001 SAN FRANCISCO, CALIFORNIA CA (SFO)
YEAR JUL AUG SEP OCT NOV DEC JAN FEB MAR APR MAY JUN TOTAL
1972–73 64 42 75 131 350 613 521 334 416 241 197 103 3087
1973–74 100 129 76 128 327 459 501 424 354 298 270 145 3211
1974–75 83 54 101 117 329 499 540 387 415 424 220 151 3320
1975–76 109 75 120 188 377 480 504 415 427 344 222 136 3397
1976–77 72 38 79 127 231 494 549 326 432 278 278 141 3045
1977–78 103 48 55 139 284 385 381 335 238 295 161 135 2559
1978–79 111 65 32 143 371 581 536 406 319 277 148 132 3121
1979–80 55 56 13 85 320 431 441 298 366 269 261 155 2750
1980–81 76 109 74 145 275 436 424 301 358 279 180 53 2710
1981–82 112 65 71 197 252 389 611 364 416 307 241 154 3179
1982–83 100 63 47 130 376 491 521 322 330 301 225 113 3019
1983–84 33 1 18 43 281 354 415 342 242 269 124 115 2237
1984–85 43 34 5 147 328 527 570 370 416 180 192 27 2839
1985–86 49 51 60 158 382 546 343 236 239 260 191 78 2593
1986–87 77 113 62 122 228 447 477 320 309 168 128 85 2536
1987–88 60 16 40 70 233 445 440 296 259 212 184 78 2333
1988-89 40 29 71 128 246 447 511 455 308 162 160 94 2651
1989-90 70 38 103 138 249 454 459 437 356 189 185 94 2772
1990-91 33 13 8 77 262 570 454 265 387 273 244 166 2752
1991–92 57 44 65 96 223 434 494 252 226 133 52 58 2134
1992-93 20 49 34 40 235 466 480 346 225 201 100 54 2250
1993–94 33 11 71 67 256 455 408 396 273 238 200 118 2526
1994–95 91 43 46 154 446 522 388 301 338 293 242 143 3007
1995–96 48 79 73 98 192 344 398 289 270 187 149 128 2255
1996–97 75 73 71 155 255 333 431 317 270 194 76 74 2324
1997–98 32 8 2 109 222 422 370 348 301 269 218 109 2410
1998–99 81 59 57 147 320 550 483 403 428 315 289 170 3302
1999–00 104 47 75 92 229 423 381 327 328 207 169 94 2476
2000–01 106 56 32 151 367 409 497 384 282 334 107 95 2820
2001– 76 60 74 100 225 408

2001 San Francisco, California international Airport (SFO)

COOLING DEGREE DAYS (base 65 F) 2001 SAN FRANCISCO, CALIFORNIA CA (SFO)
YEAR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANNUAL
1972 0 0 1 0 7 14 49 16 8 14 0 0 109
1973 0 0 0 0 7 64 18 2 37 1 0 0 129
1974 0 0 0 0 6 11 27 22 31 30 0 0 127
1975 0 0 0 0 21 4 15 19 19 2 0 0 80
1976 0 0 0 0 21 88 4 23 33 23 0 0 192
1977 0 0 0 0 0 10 30 26 17 5 0 0 88
1978 0 0 0 0 24 0 7 18 62 33 0 0 144
1979 0 0 0 0 11 19 25 21 88 18 0 0 182
1980 0 0 0 0 0 10 22 7 30 33 1 0 103
1981 0 0 0 17 1 61 17 7 7 3 0 0 113
1982 0 0 0 1 12 5 7 15 23 12 0 0 75
1983 0 0 0 0 7 16 42 66 119 32 0 0 282
1984 0 0 0 4 33 10 70 24 152 9 0 0 302
1985 0 0 0 8 1 38 50 28 11 33 0 0 169
1986 0 0 1 2 0 11 5 0 7 16 0 0 42
1987 0 0 0 4 29 15 9 26 17 43 0 0 143
1988 0 0 0 11 19 8 55 34 23 24 0 0 174
1989 0 0 0 40 6 35 8 15 2 16 0 0 122
1990 0 0 0 1 3 23 23 58 58 24 0 0 190
1991 0 0 0 0 0 6 21 29 13 33 2 0 104
1992 0 0 0 9 10 21 53 18 49 58 0 0 218
1993 0 0 0 0 18 58 33 91 19 26 1 0 246
1994 0 0 0 0 4 18 4 30 27 8 0 0 91
1995 0 0 0 0 0 26 48 26 25 29 0 0 154
1996 0 0 0 18 16 30 22 9 21 36 0 0 152
1997 0 0 1 0 65 1 5 78 107 15 7 0 279
1998 0 0 0 0 0 13 23 44 45 6 0 0 131
1999 0 0 0 9 0 15 17 19 41 24 0 0 125
2000 0 0 2 10 27 36 2 20 73 1 0 0 171
2001 0 0 0 0 38 30 13 10 16 28 0 0 135

2001 San Francisco, California international Airport (SFO)

SNOWFALL (inches) 2001 SAN FRANCISCO, CALIFORNIA CA (SFO)
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 T 0.0 0.0 T 0.0 0.0 0.0 T
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 T 0.0 0.0 0.0 0.0 0.0 T
1975–76 0.0 0.0 0.0 0.0 0.0 0.0 0.0 T T 0.0 0.0 0.0 T
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 T 0.0 0.0 0.0 0.0 0.0 T
1979–80 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 T 0.0 0.0 0.0 T
1980–81 0.0 0.0 0.0 0.0 0.0 0.0 0.0 T 0.0 0.0 0.0 0.0 T
1981–82 0.0 0.0 0.0 0.0 0.0 0.0 T 0.0 T 0.0 0.0 0.0 T
1982–83 0.0 0.0 0.0 0.0 0.0 0.0 0.0 T T 0.0 0.0 0.0 T
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 T 0.0 0.0 0.0 0.0 T
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 T T T 0.0 0.0 0.0 0.0 T
1989-90 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
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 T 0.0 0.0 0.0 T
1992–93 0.0 0.0 0.0 0.0 0.0 T 0.0 0.0 0.0 0.0 0.0 0.0 T
1993–94 0.0 0.0 0.0 0.0 0.0 0.0 0.0 T 0.0 0.0 0.0 0.0 T
1994–95 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 T 0.0 0.0 0.0 T
1995–96 0.0 0.0 0.0 0.0 0.0 0.0 0.0 T 0.0 0.0 0.0 0.0 T
1996–97 0.0 0.0 0.0
1997–98
1998–99
1999–00
2000–01
2001–
POR=68 YRS 0.0 0.0 0.0 0.0 0.0 0.0 0.0 T T 0.0 0.0 0.0 T



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2001 San Francisco, California International Airport (SFO) forum