SAN FRANCISCO, CALIFORNIA, INTERNATIONAL AIRPORT
NORMALS, MEANS, AND EXTREMES

LATITUDE: 37 Deg. 37 Min. N LONGITUDE: 122 Deg. 23 Min. W ELEVATION: FT. GRND 8 BARO 90 TIME ZONE: PACIFIC WBAN: 23234

(a)
JAN
FEB
MAR
APR
MAY
JUN
JUL
AUG
SEP
OCT
NOV
DEC
YEAR
TEMPERATURE (Deg. F)
Normals
-Daily Maximum
-Daily Minimum
-Monthly
Extremes
-Record Highest
-Year
-Record Lowest
-Year






68

68



55.6
41.8
48.7

72
1948
24
1928


59.4
45.0
52.2

78
1930
25
1929


60.8
45.8
53.3

85
1952
30
1929


63.9
47.2
55.6

92
1989
31
1929


66.5
49.7
58.1

97
1984
36
1929


70.3
52.6
61.5

106
1961
41
1932


71.6
53.9
62.7

105
1988
43
1928


72.3
55.0
63.7

100
1993
42
1935


73.6
55.2
64.5

103
1971
38
1929


70.1
51.8
61.0

99
1987
34
1929


62.4
47.1
54.8

85
1967
25
1931


56.1
42.7
49.4

75
1958
20
1932


65.2
49.0
57.1

106
JUN 1961
20
DEC 1932
NORMAL DEGREE DAYS
Heating (base 65 Deg. F)
Cooling (base 65 Deg. F)




505
0

358
0

363
0

287
5

218
0

121
16

92
21

68
28

79
64

135
11

306
0

484
0

3016
145
% OF POSSIBLE SUNSHINE














MEAN SKY COVER(tenths)
Sunrise - Sunset
MEAN NUMBER OF DAYS:
Sunrise to Sunset
-Clear
-Partly Cloudy
-Cloudy
Precipitation
.01 inches or more
Snow, Ice Pellets, Hail
1.0 inches or more
Thunderstorms
Heavy Fog Visibility
1/4 mile or less
Temperature Deg. F
-Maximum
90 Deg. F and above
32 Deg. F and below
-Minimum
32 Deg. F and below
0 Deg. F and below

54


68
68
68

68

68
68

58


36
36

36
36

6.2


8.5
7.6
14.9

10.8

0.*
0.4

3.5


0.0
0.0

1.0
0.0

6.2


7.8
7.4
13.1

9.6

0.0
0.4

2.6


0.0
0.0

0.1
0.0

5.8


9.6
8.6
12.9

10.0

0.0
0.3

0.4


0.0
0.0

0..
0.0

5.2


10.8
9.3
9.9

5.9

0.0
0.2

0.1


0.1
0.0

0.0
0.0

4.5


13.5
9.7
7.8

2.9

0.0
0.1

0.1


0.3
0.0

0.0
0.0

3.7


16.1
8.6
5.3

1.2

0.0
0.1

0.*


1.0
0.0

0.0
0.0

3.0


20.6
7.6
2.8

0.3

0.0
0.1

0.*


0.7
0.0

0.0
0.0

3.3


19.0
8.7
3.3

0.5

0.0
0.1

0.2


0.3
0.0

0.0
0.0

3.2


18.1
8.3
3.6

1.0

0.0
0.2

0.6


1.2
0.0

0.0
0.0

4.0


15.5
8.9
6.5

3.5

0.0
0.3

1.3


0.4
0.0

0.0
0.0

5.4


11.1
8.3
10.6

7.0

0.0
0.1

2.1


0.0
0.0

0.0
0.0

6.0


9.4
7.5
14.1

9.9

0.*
0.2

3.2


0.0
0.0

0.8
0.0

4.7


160.1
100.4
104.8

62.5

0.*
2.5

14.2


4.0
0.0

1.9
0.0
AV. STATION PRES. (mb)
23
1019.1
1018.1
1016.8
1016.9
1015.0
1014.3
1014.2
1013.9
1013.6
1015.8
1018.5
1019.6
1016.3
RELATIVE HUMIDITY (%)
Hour 04
Hour 10 (Local Time)
Hour 16
Hour 22

36
36
36
36

86
79
67
81

85
76
65
79

82
71
63
77

82
65
60
77

84
64
60
79

85
63
58
80

86
65
59
82

87
67
61
83

84
66
59
80

82
68
59
77

84
72
63
77

85
77
67
80

84
69
62
79
PRECIPITATION (in.)
Water Equivalent
-Normal
-Maximum Monthly
-Year
-Minimum Monthly
-Year
-Maximum in 24 hrs
-Year
Snow, Ice Pellets, Hail
-Maximum Monthly
-Year
-Maximum in 24 hrs
-Year



68

68

68


68

68



4.35
11.26
1993
0.24
1991
5.71
1982

1.5
1962
1.5
1962


3.17
9.52
1958
T
1953
2.64
1987

T
1994
T
1994


3.06
9.01
1958
T
1934
2.46
1982

T
1995
T
1995


1.37
6.36
1958
T
1977
2.66
1958

0.0

T
1987


0.19
3.81
1957
T
1992
1.54
1957

0.0

0.0



0.11
0.86
1967
0.00
1928
0.83
1967

0.0

0.0



0.03
0.35
1977
0.00
1930
0.35
1977

0.0

0.0



0.05
0.66
1976
T
1995
0.36
1976

0.0

0.0



0.20
2.30
1959
T
1995
2.30
1959

0.0

0.0



1.22
7.30
1962
T
1978
3.74
1962

0.0

0.0



2.86
7.94
1973
0.00
1929
2.43
1994

0.0

0.0



3.09
12.30
1955
0.01
1989
3.33
1955

1.0
1932
1.0
1932


19.70
12.30
DEC 1955
0.00
JUL 1930
5.71
JAN 1982

1.5
JAN 1962
1.5
JAN 1962
WIND
Mean Speed (mph)
Prevailing Direction
through 1964
Fastest Mile
-Direction(!!)
-Speed(mph)
-Year
Peak Gust
-Direction(!!)
-Speed(mph)
-Date

68



46



12
12


7.2

WNW

16
58
1963

S
61
1995

8.6

WNW

22
55
1990

S
69
1986

10.5

WNW

17
41
1995

S
64
1995

12.2

WNW

18
47
1992

NW
54
1984

13.4

W

31
41
1984

NW
58
1984

14.0

W

28
44
1969

W
51
1984

13.6

NW

28
40
1993

W
52
1987

12.8

NW

27
36
1974

W
45
1992

11.1

NW

28
38
1968

NW
44
1994

9.4

WNW

25
44
1950

S
58
1989

7.5

WNW

20
47
1953

S
60
1984

7.1

WNW

22
54
1995

SW
74
1995

10.6

WNW

16
58
JAN 1963

SW
74
DEC 1995
(a) - Length of Record in Years, although individual months may be missing.
0.* or * - The value is between 0.0 and 0.05.
Normals - Based on the 1961 - 1990 record period.
Extremes - Dates are the most recent occurrence.
Wind Dir.- Numerals show tens of degrees clockwise from true north. "00" indicates calm.
Resultant Directions are given to whole degrees.