San Francisco, CA: Clear/Cloudy Skies, and Daylight Hours
Average Number of Clear Days
San Francisco, CA
U.S. Avg.
Difference
January
19
17
+2
February
19
16
+3
March
20
17
+3
April
22
17
+5
May
22
18
+4
June
23
19
+4
July
23
20
+3
August
22
20
+2
September
22
19
+3
October
23
19
+4
November
21
18
+3
December
19
17
+2
Average Number of Cloudy Days
San Francisco, CA
U.S. Avg.
Difference
January
12
14
-2
February
9
12
-3
March
11
14
-3
April
8
13
-5
May
9
13
-4
June
7
11
-4
July
8
11
-3
August
9
11
-2
September
8
11
-3
October
8
12
-4
November
9
12
-3
December
12
14
-2
Average Daylight Hours per Day
San Francisco, CA
U.S. Avg.
Difference
January
10
10
No difference
February
11
11
No difference
March
12
12
No difference
April
13
13
No difference
May
14
14
No difference
June
15
15
No difference
July
14
15
-1
August
14
14
No difference
September
13
13
No difference
October
12
12
No difference
November
10
10
No difference
December
10
10
No difference
San Francisco, CA: Rainy Days, Snow Days, and Humidity
Average Number of Rainy Days
San Francisco, CA
U.S. Avg.
Difference
January
9
9
No difference
February
10
8
+2
March
10
9
+1
April
6
7
-1
May
3
7
-4
June
2
7
-5
July
1
7
-6
August
1
6
-5
September
2
7
-5
October
3
7
-4
November
8
8
No difference
December
9
8
+1
Average Number of Snow Days
San Francisco, CA
U.S. Avg.
Difference
January
0
2
-2
February
0
2
-2
March
0
1
-1
April
0
0
No difference
May
0
0
No difference
June
0
0
No difference
July
0
0
No difference
August
0
0
No difference
September
0
0
No difference
October
0
0
No difference
November
0
1
-1
December
0
2
-2
Average Humidity (%)
San Francisco, CA
U.S. Avg.
Difference
January
75
68
+7%
February
76
66
+10%
March
72
63
+9%
April
67
59
+8%
May
64
61
+3%
June
63
60
+3%
July
64
61
+3%
August
65
62
+3%
September
67
63
+4%
October
69
63
+6%
November
72
65
+7%
December
74
68
+6%
The assessments presented on this website, including those related to crime, safety, cost of living, and other location characteristics (e.g., states, cities, towns, villages, neighborhoods, areas, landmarks), are based on various sources and our internal research methods. These assessments are not guaranteed to be accurate or complete and should not be used as the sole basis for making any decisions.