Weather History for San Francisco, CA

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Month of January, 2012

  Max Avg Min Sum
Temperature  
Max Temperature 65 °F 58 °F 50 °F
Mean Temperature 56 °F 51 °F 43 °F
Min Temperature 50 °F 43 °F 34 °F
Degree Days  
Heating Degree Days (base 65) 22 14 9 441
Cooling Degree Days (base 65) 0 0 0 0
Growing Degree Days (base 50) 6 1 0 46
Dew Point  
Dew Point 56 °F 41 °F 23 °F
Precipitation  
Precipitation 1.22 in 0.07 in 0.00 in 2.16 in
Snowdepth - - - -
Wind  
Wind 40 mph 6 mph 0 mph
Gust Wind 56 mph 27 mph 16 mph
Sea Level Pressure  
Sea Level Pressure 30.45 in 30.19 in 29.69 in

Monthly Weather History Graph

Monthly Weather History Graph

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Date:

Astronomy

Jan. 31, 2012 Rise Set
Actual Time 7:14 AM PST 5:31 PM PST
Civil Twilight 6:46 AM PST 5:59 PM PST
Nautical Twilight 6:15 AM PST 6:30 PM PST
Astronomical Twilight 5:44 AM PST 7:01 PM PST
Moon 11:26 AM PST (1/31) 1:06 AM PST (1/31)
Length of Visible Light 11h 12m
Length of Day
10h 17m
First Quarter, 56% of the Moon is Illuminated
Jan 31
First Quarter
Feb 7
Full
Feb 14
Last Quarter
Feb 21
New
Feb 29
First Quarter

Weather History Calendar

Precipitation Actual month total 2.16 Normal Month Total: 4.19
Sunday Monday Tuesday Wednesday Thursday Friday Saturday
Scattered Clouds
Actual:
58 | 43 0.00
Average:
56 | 44 0.14
Partly Cloudy
Actual:
55 | 45 0.00
Average:
56 | 44 0.14
Fog
Actual:
53 | 48 0.00
Average:
56 | 44 0.13
Partly Cloudy
Actual:
57 | 43 0.00
Average:
56 | 44 0.14
Scattered Clouds
Actual:
61 | 43 0.00
Average:
56 | 44 0.14
Partly Cloudy
Actual:
56 | 44 0.00
Average:
56 | 44 0.13
Scattered Clouds
Actual:
64 | 41 0.00
Average:
56 | 44 0.14
Scattered Clouds
Actual:
65 | 46 0.00
Average:
56 | 44 0.14
Scattered Clouds
Actual:
60 | 41 0.00
Average:
56 | 44 0.14
Partly Cloudy
Actual:
59 | 40 0.00
Average:
56 | 44 0.15
Scattered Clouds
Actual:
65 | 39 0.00
Average:
56 | 44 0.15
Clear
Actual:
63 | 40 0.00
Average:
56 | 44 0.14
Scattered Clouds
Actual:
62 | 40 0.00
Average:
56 | 44 0.14
Scattered Clouds
Actual:
60 | 40 0.00
Average:
56 | 44 0.15
Partly Cloudy
Actual:
52 | 44 0.00
Average:
56 | 44 0.14
Clear
Actual:
50 | 35 0.00
Average:
56 | 44 0.13
Partly Cloudy
Actual:
51 | 34 0.00
Average:
56 | 44 0.14
Partly Cloudy
Actual:
53 | 35 0.00
Average:
56 | 44 0.13
Rain
Actual:
52 | 38 0.08
Average:
56 | 44 0.12
Rain
Actual:
59 | 49 1.22
Average:
57 | 44 0.12
Rain
Actual:
57 | 45 0.08
Average:
57 | 44 0.13
Rain
Actual:
53 | 44 0.29
Average:
57 | 45 0.12
Rain
Actual:
57 | 49 0.49
Average:
57 | 45 0.13
Partly Cloudy
Actual:
58 | 46 0.00
Average:
57 | 45 0.13
Fog
Actual:
61 | 49 0.00
Average:
57 | 45 0.13
Fog
Actual:
60 | 50 0.00
Average:
57 | 45 0.13
Fog
Actual:
65 | 46 0.00
Average:
57 | 45 0.13
Scattered Clouds
Actual:
61 | 40 0.00
Average:
57 | 45 0.13
Partly Cloudy
Actual:
60 | 43 0.00
Average:
58 | 45 0.13
Partly Cloudy
Actual:
56 | 49 T
Average:
58 | 45 0.14
Mostly Cloudy
Actual:
57 | 45 T
Average:
58 | 45 0.14
 

Calendar Legend

Sunny
Clear
Mostly Cloudy
Partly Sunny
Partly Cloudy
Mostly Sunny
Cloudy Rain Snow
Hail
Flurries
Thunderstorms Hazy
Fog
Sleet '?' denotes
'chance of'
Unknown

Daily Weather History & Observations

2012 Temp. (°F) Dew Point (°F) Humidity (%) Sea Level Press. (in) Visibility (mi) Wind (mph) Precip. (in) Events
Jan high avg low high avg low high avg low high avg low high avg low high avg high sum  
1 58 51 43 47 43 39 89 75 61 30.21 30.16 30.12 10 10 9 14 4 16 0.00  
2 55 50 45 48 46 42 93 85 77 30.32 30.27 30.18 10 8 5 15 3 17 0.00  
3 53 51 48 48 47 44 100 89 77 30.38 30.32 30.28 9 3 0 12 2 14 0.00 Fog
4 57 50 43 48 45 41 93 77 61 30.40 30.33 30.29 10 9 5 24 4 28 0.00  
5 61 52 43 49 45 40 93 76 59 30.33 30.25 30.18 10 10 7 24 10 31 0.00  
6 56 50 44 45 44 41 93 77 61 30.22 30.16 30.13 10 9 7 18 7 23 0.00  
7 64 53 41 43 36 28 89 59 29 30.25 30.18 30.13 10 10 10 25 7 30 0.00  
8 65 56 46 39 31 23 61 43 24 30.25 30.21 30.18 10 10 10 18 6 28 0.00  
9 60 51 41 46 39 30 83 65 47 30.27 30.21 30.17 10 10 7 12 3 14 0.00  
10 59 50 40 43 39 36 89 67 44 30.19 30.14 30.09 10 8 6 13 3 15 0.00  
11 65 52 39 47 39 33 86 65 43 30.16 30.09 30.04 10 10 10 9 2 12 0.00  
12 63 52 40 40 34 28 86 58 29 30.14 30.09 30.05 10 10 9 7 1 8 0.00  
13 62 51 40 44 36 31 89 62 35 30.24 30.18 30.15 10 10 8 7 2 7 0.00  
14 60 50 40 44 39 34 86 69 51 30.22 30.15 30.10 10 9 8 16 4 20 0.00  
15 52 48 44 43 37 26 86 66 45 30.18 30.10 30.07 10 10 10 33 15 40 0.00  
16 50 43 35 32 27 23 70 53 36 30.34 30.28 30.19 10 10 10 13 5 15 0.00  
17 51 43 34 36 33 29 76 64 52 30.44 30.38 30.35 10 10 10 14 4 17 0.00  
18 53 44 35 42 37 32 89 77 64 30.43 30.36 30.28 10 10 10 9 4 12 0.00  
19 52 45 38 47 41 35 93 82 71 30.27 30.15 30.05 10 9 5 15 7 20 0.08 Rain
20 59 54 49 56 52 46 93 88 83 30.04 29.88 29.72 10 5 2 40 15 56 1.22 Rain
21 57 51 45 54 44 39 93 76 59 30.17 29.98 29.75 10 9 3 33 18 43 0.08 Rain
22 53 49 44 49 43 37 89 80 71 30.18 30.05 29.80 10 8 2 18 9 25 0.29 Rain
23 57 53 49 54 48 43 100 87 74 30.17 29.89 29.69 10 7 2 33 19 49 0.49 Rain
24 58 52 46 46 43 38 93 75 57 30.44 30.32 30.17 10 10 9 15 5 17 0.00  
25 61 55 49 54 49 43 93 76 59 30.45 30.40 30.34 10 10 6 17 5 21 0.00 Fog
26 60 55 50 54 51 48 96 88 80 30.36 30.30 30.25 10 8 4 21 8 24 0.00 Fog
27 65 56 46 50 45 27 100 62 24 30.30 30.26 30.22 10 4 0 16 2 18 0.00 Fog
28 61 51 40 47 36 24 77 53 28 30.35 30.29 30.24 10 10 10 10 3 12 0.00  
29 60 52 43 46 43 39 89 72 55 30.28 30.22 30.14 10 10 8 17 4 20 0.00  
30 56 53 49 47 46 40 86 76 66 30.13 30.08 30.04 10 10 10 20 8 23 T  
31 57 51 45 46 44 40 86 77 67 30.22 30.15 30.09 10 10 9 20 8 23 T