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H
I S T O R I C A L
W
E A T H E R
D
A T A
Average Temperature
Year
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
°F
60
35.9
40.9
50.3
60.4
68.4
76.7
82
81.1
73
62
49.6
39.3
°C
15
2
4
10
15
20
24
27
27
22
16
9
4
Years Charted: 30
Source:
National Weather Service, San Francisco
Results based on data collected from 1961 - 1990
Average High Temperature
Year
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
°F
71.1
46.7
52.1
62
71.9
79.1
87.3
93.4
92.5
83.8
73.6
60.4
49.9
°C
21
8
11
16
22
26
30
34
33
28
23
15
9
Years Charted: 30
Source:
National Weather Service, San Francisco
Results based on data collected from 1961 - 1990
Average Low Temperature
Year
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
°F
48.8
25.2
29.6
38.5
48.8
57.7
66.1
70.6
69.6
62.2
50.4
38.6
28.6
°C
9
-3
-1
3
9
14
18
21
20
16
10
3
-1
Years Charted: 30
Source:
National Weather Service, San Francisco
Results based on data collected from 1961 - 1990
Highest Recorded Temperature
Year
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
°F
110
80
84
93
100
104
105
109
110
102
96
87
86
°C
43
26
28
33
37
40
40
42
43
38
35
30
30
Years Charted: 40
Source:
National Weather Service, San Francisco
Results based on data collected through 1993
Lowest Recorded Temperature
Year
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
°F
-8
-4
-3
3
20
37
47
53
51
36
16
11
-8
°C
-22
-20
-19
-16
-6
2
8
11
10
2
-8
-11
-22
Years Charted: 40
Source:
National Weather Service, San Francisco
Results based on data collected through 1993
Mean Number of Days Below 32°F/0°C
Total
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
Days
76
23
16
8
1
0
0
0
0
0
1
9
20
Years Charted: 28
Source:
National Weather Service, San Francisco
Results based on data collected through 1993
Average Precipitation
Year
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
in.
33.36
1.13
1.56
2.71
2.77
5.22
4.31
2.61
2.6
3.84
3.23
1.98
1.4
mm
847
28
39
68
70
132
109
66
66
97
82
50
35
Years Charted: 30
Source:
National Weather Service, San Francisco
Results based on data collected from 1961 - 1990
Average Snowfall
Year
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
in.
9.1
3
2.4
1.4
0
0
0
0
0
0
0
0.5
1.8
mm
231
76
60
35
0
0
0
0
0
0
0
12
45
Years Charted: 54
Source:
National Weather Service, San Francisco
Results based on data collected through 1993
Average Wind Speed
Year
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
mph
12.3
12.6
13.1
14.5
14.2
12.6
11.9
10.9
10.4
11
11.8
12.4
12.4
km/h
19
20
21
23
22
20
19
17
16
17
18
19
19
Years Charted: 45
Source:
National Weather Service, San Francisco
Results based on data collected through 1993
Average Days of Precipitation
Total
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
Days
83
6
6
7
8
10
9
6
7
7
6
5
6
Years Charted: 54
Source:
National Weather Service, San Francisco
Results based on data collected through 1993
Days With Sunshine
Year
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
%
68
60
60
65
67
67
75
79
79
73
70
61
59
Years Charted: 39
Source:
National Weather Service, San Francisco
Results based on data collected through 1993
Mean Number of Cloudy Days
Total
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
Days
130
14
12
13
13
12
9
7
7
9
10
11
13
Years Charted: 44
Source:
National Weather Service, San Francisco
Results based on data collected through 1993
Mean Number of Partly Cloudy Days
Total
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
Days
96
6
7
8
8
10
11
9
10
8
7
7
6
Years Charted: 44
Source:
National Weather Service, San Francisco
Results based on data collected through 1993
Mean Number of Clear Days
Total
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
Days
139
11
9
10
9
9
10
15
14
13
14
12
12
Years Charted: 44
Source:
National Weather Service, San Francisco
Results based on data collected through 1993
Average Morning Relative Humidity
Year
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
%
80
78
78
76
77
83
84
80
80
84
79
79
78
Years Charted: 28
Source:
National Weather Service, San Francisco
Results based on data collected through 1993
Average Afternoon Relative Humidity
Year
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
%
55
60
58
53
52
58
56
50
50
55
52
56
58
Years Charted: 28
Source:
National Weather Service, San Francisco
Results based on data collected through 1993
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