Weather History for KSFO - January, 2011

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Month of January, 2011

  Max Avg Min Sum
Temperature  
Max Temperature 68 °F 57 °F 47 °F
Mean Temperature 56 °F 51 °F 43 °F
Min Temperature 50 °F 44 °F 36 °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 2 0 52
Dew Point  
Dew Point 54 °F 43 °F 27 °F
Precipitation  
Precipitation 0.35 in 0.03 in 0.00 in 0.94 in
Snowdepth - - - -
Wind  
Wind 26 mph 5 mph 0 mph
Gust Wind 70 mph 25 mph 20 mph
Sea Level Pressure  
Sea Level Pressure 30.42 in 30.16 in 29.90 in

Monthly Weather History Graph

Monthly Weather History Graph

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Astronomy

Jan. 23, 2011 Rise Set
Actual Time 7:19 AM PST 5:23 PM PST
Civil Twilight 6:51 AM PST 5:51 PM PST
Nautical Twilight 6:19 AM PST 6:23 PM PST
Astronomical Twilight 5:48 AM PST 6:54 PM PST
Moon 10:23 PM PST (1/23) 9:25 AM PST (1/23)
Length of Visible Light 10h 59m
Length of Day
10h 03m
Waning Gibbous, 79% of the Moon is Illuminated
Jan 23
Waning Gibbous
Jan 26
Last Quarter
Feb 2
New
Feb 10
First Quarter
Feb 18
Full

Daily Weather History & Observations

2011 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 52 50 47 46 44 41 93 85 77 30.09 30.01 29.95 10 10 7 20 9 25 0.09 Rain
2 51 50 48 47 45 42 93 87 80 30.01 29.95 29.90 10 10 5 22 9 25 0.35 Rain
3 53 49 45 46 44 42 92 82 71 30.20 30.08 30.01 10 9 8 12 4 13 0.00  
4 53 46 39 43 41 37 92 80 68 30.31 30.26 30.20 10 10 7 8 1 12 0.00  
5 55 47 38 45 40 36 92 78 63 30.37 30.30 30.26 10 10 9 14 5 15 0.00  
6 52 45 37 43 39 34 92 78 63 30.28 30.21 30.14 10 10 6 13 5 17 0.00  
7 47 43 39 43 39 36 92 84 76 30.17 30.11 30.06 8 7 4 10 3 13 0.00  
8 49 46 43 43 42 40 96 88 80 30.12 30.07 30.02 10 6 3 13 5 15 0.00  
9 48 44 39 39 35 32 86 70 54 30.19 30.14 30.08 10 10 10 14 5 17 0.00  
10 49 43 36 35 32 27 85 64 42 30.24 30.19 30.17 10 10 10 18 8 21 0.00  
11 49 46 43 44 37 32 86 70 53 30.26 30.20 30.14 10 10 7 12 3 14 0.04 Rain
12 55 52 48 46 44 41 86 76 66 30.38 30.33 30.26 10 10 8 9 3 14 T  
13 56 51 45 54 49 44 100 90 80 30.40 30.36 30.34 10 4 0 12 2 13 0.15 Fog , Rain
14 60 55 50 52 50 48 100 84 67 30.42 30.37 30.32 10 8 1 14 4 16 0.00  
15 63 55 47 50 49 46 100 83 65 30.33 30.27 30.22 10 10 6 15 4 - 0.00  
16 57 52 47 52 48 46 100 89 77 30.29 30.24 30.21 10 3 0 21 4 24 0.00 Fog
17 57 53 48 51 48 46 100 90 80 30.26 30.20 30.14 10 2 0 15 3 17 0.00 Fog
18 59 53 46 49 47 45 100 81 62 30.15 30.11 30.06 10 6 0 18 4 23 0.00 Fog
19 61 55 48 49 47 43 83 74 64 30.13 30.09 30.04 10 10 10 26 11 32 0.00  
20 63 54 45 44 39 33 86 60 34 30.21 30.16 30.10 10 10 10 17 4 23 0.00  
21 60 52 43 49 44 39 93 74 55 30.17 30.11 30.07 10 8 5 15 3 18 0.00  
22 67 56 44 50 44 39 93 72 51 30.06 30.02 29.97 10 10 10 12 3 14 0.00  
23 63 55 47 47 38 30 67 53 39 30.19 30.13 30.00 10 10 10 14 4 24 0.00  
24 63 53 43 48 43 37 86 69 51 30.18 30.15 30.11 10 10 6 18 4 22 0.00  
25 68 56 44 48 44 42 93 69 44 30.17 30.11 30.06 10 10 8 14 2 15 0.00  
26 65 56 46 49 44 40 86 67 47 30.22 30.15 30.10 10 10 9 9 3 22 0.00  
27 62 53 44 50 47 41 86 75 64 30.29 30.22 30.17 10 9 6 13 3 70 0.00  
28 53 50 46 47 45 43 100 86 71 30.19 30.14 30.09 10 6 0 15 7 17 0.00 Fog
29 56 53 50 50 48 45 89 83 77 30.12 30.08 30.02 10 10 7 23 8 29 0.06 Rain
30 57 52 46 49 46 42 86 79 71 30.22 30.07 29.98 10 10 7 18 9 23 0.25 Rain
31 56 49 41 47 45 39 93 83 72 30.31 30.25 30.22 10 10 10 25 9 31 0.00