Weather History for San Francisco, CA

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Month of December, 2011

  Max Avg Min Sum
Temperature  
Max Temperature 71 °F 57 °F 51 °F
Mean Temperature 63 °F 49 °F 44 °F
Min Temperature 56 °F 42 °F 36 °F
Degree Days  
Heating Degree Days (base 65) 21 16 2 482
Cooling Degree Days (base 65) 0 0 0 0
Growing Degree Days (base 50) 13 1 0 32
Dew Point  
Dew Point 52 °F 38 °F 13 °F
Precipitation  
Precipitation 0.06 in 0.00 in 0.00 in 0.13 in
Snowdepth - - - -
Wind  
Wind 30 mph 5 mph 0 mph
Gust Wind 36 mph 28 mph 18 mph
Sea Level Pressure  
Sea Level Pressure 30.58 in 30.20 in 29.75 in

Monthly Weather History Graph

Monthly Weather History Graph

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Date:

Astronomy

Dec. 14, 2011 Rise Set
Actual Time 7:16 AM PST 4:51 PM PST
Civil Twilight 6:47 AM PST 5:21 PM PST
Nautical Twilight 6:14 AM PST 5:53 PM PST
Astronomical Twilight 5:42 AM PST 6:25 PM PST
Moon 9:14 PM PST (12/14) 10:07 AM PST (12/14)
Length of Visible Light 10h 33m
Length of Day
9h 35m
Waning Gibbous, 82% of the Moon is Illuminated
Dec 14
Waning Gibbous
Dec 17
Last Quarter
Dec 24
New
Dec 31
First Quarter
Jan 8
Full

Weather History Calendar

Precipitation Actual month total 0.13 Normal Month Total: 4.03
Sunday Monday Tuesday Wednesday Thursday Friday Saturday
 
Clear
Actual:
63 | 56 0.00
Average:
59 | 46 0.11
Scattered Clouds
Actual:
71 | 54 0.00
Average:
59 | 46 0.10
Clear
Actual:
61 | 47 0.00
Average:
58 | 46 0.11
Scattered Clouds
Actual:
58 | 42 0.00
Average:
58 | 46 0.11
Scattered Clouds
Actual:
57 | 41 0.00
Average:
58 | 46 0.11
Partly Cloudy
Actual:
54 | 39 0.00
Average:
58 | 46 0.11
Scattered Clouds
Actual:
55 | 39 0.00
Average:
58 | 45 0.13
Partly Cloudy
Actual:
57 | 39 0.00
Average:
57 | 45 0.12
Clear
Actual:
58 | 39 0.00
Average:
57 | 45 0.12
Scattered Clouds
Actual:
57 | 40 0.00
Average:
57 | 45 0.11
Rain
Actual:
53 | 43 0.01
Average:
57 | 45 0.12
Rain
Actual:
51 | 43 0.06
Average:
57 | 45 0.12
Scattered Clouds
Actual:
56 | 39 0.00
Average:
57 | 45 0.12
Partly Cloudy
Actual:
52 | 40 0.00
Average:
57 | 45 0.13
Rain
Actual:
53 | 43 0.06
Average:
56 | 45 0.13
Scattered Clouds
Actual:
62 | 38 0.00
Average:
56 | 44 0.13
Clear
Actual:
55 | 39 0.00
Average:
56 | 44 0.13
Fog
Actual:
53 | 40 0.00
Average:
56 | 44 0.14
Rain
Actual:
59 | 45 T
Average:
56 | 44 0.14
Scattered Clouds
Actual:
60 | 40 0.00
Average:
56 | 44 0.15
Clear
Actual:
60 | 39 0.00
Average:
56 | 44 0.15
Scattered Clouds
Actual:
57 | 39 0.00
Average:
56 | 44 0.15
Scattered Clouds
Actual:
52 | 36 0.00
Average:
56 | 44 0.15
Scattered Clouds
Actual:
57 | 36 0.00
Average:
56 | 44 0.15
Scattered Clouds
Actual:
52 | 36 0.00
Average:
56 | 44 0.15
Partly Cloudy
Actual:
52 | 39 0.00
Average:
56 | 44 0.14
Partly Cloudy
Actual:
57 | 45 0.00
Average:
56 | 44 0.14
Partly Cloudy
Actual:
59 | 43 0.00
Average:
56 | 44 0.14
Fog
Actual:
56 | 46 0.00
Average:
56 | 44 0.14
Partly Cloudy
Actual:
54 | 49 0.00
Average:
56 | 44 0.14
Partly Cloudy
Actual:
57 | 43 0.00
Average:
56 | 44 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

2011 Temp. (°F) Dew Point (°F) Humidity (%) Sea Level Press. (in) Visibility (mi) Wind (mph) Precip. (in) Events
Dec high avg low high avg low high avg low high avg low high avg low high avg high sum  
1 63 60 56 37 33 30 44 38 32 30.24 30.15 30.06 10 10 10 30 18 36 0.00  
2 71 63 54 45 32 21 66 41 16 30.05 30.01 29.96 10 10 9 30 10 33 0.00  
3 61 54 47 39 30 18 55 40 24 30.28 30.16 30.05 10 10 10 25 12 31 0.00  
4 58 50 42 45 35 18 86 56 26 30.30 30.22 30.15 10 10 10 15 5 17 0.00  
5 57 49 41 41 34 26 76 54 32 30.32 30.23 30.17 10 10 10 24 8 28 0.00  
6 54 47 39 41 36 31 82 66 50 30.42 30.36 30.33 10 10 8 12 4 15 0.00  
7 55 47 39 45 38 30 86 67 47 30.35 30.25 30.16 10 9 8 18 5 21 0.00  
8 57 48 39 45 40 36 89 68 47 30.18 30.15 30.11 10 9 6 8 2 12 0.00  
9 58 49 39 44 37 34 92 68 43 30.23 30.18 30.15 10 8 6 6 2 8 0.00  
10 57 49 40 45 41 34 89 78 66 30.17 30.11 30.04 8 6 5 16 4 18 0.00  
11 53 48 43 43 41 38 86 70 54 30.04 29.93 29.84 10 9 6 13 4 16 0.01 Rain
12 51 47 43 43 41 38 86 75 63 29.89 29.80 29.75 10 10 9 14 4 15 0.06 Rain
13 56 48 39 44 40 36 89 78 66 30.15 30.03 29.91 10 8 4 17 5 21 0.00  
14 52 46 40 45 41 37 92 82 71 30.31 30.25 30.17 10 10 8 13 4 15 0.00  
15 53 48 43 45 42 39 93 81 68 30.27 30.23 30.19 10 9 6 18 7 21 0.06 Rain
16 62 50 38 41 37 32 92 64 35 30.27 30.20 30.14 10 10 10 16 4 18 0.00  
17 55 47 39 46 39 34 86 70 54 30.19 30.14 30.10 10 10 9 9 4 12 0.00  
18 53 47 40 45 41 33 89 80 70 30.22 30.16 30.12 10 10 9 15 5 17 0.00 Fog
19 59 52 45 45 42 38 86 67 47 30.12 30.08 30.03 10 10 8 15 4 17 T Rain
20 60 50 40 42 34 28 83 56 29 30.12 30.07 30.04 10 10 10 9 3 12 0.00  
21 60 50 39 41 35 32 82 59 36 30.17 30.10 30.06 10 10 9 9 2 10 0.00  
22 57 48 39 36 24 13 65 41 17 30.49 30.33 30.18 10 10 10 23 8 28 0.00  
23 52 44 36 40 31 25 82 64 46 30.58 30.52 30.48 10 10 10 12 2 13 0.00  
24 57 47 36 41 32 27 85 62 38 30.50 30.44 30.38 10 10 7 10 2 12 0.00  
25 52 44 36 41 35 28 85 73 61 30.45 30.38 30.32 9 7 5 8 2 9 0.00  
26 52 46 39 45 41 34 89 80 71 30.38 30.32 30.30 10 7 3 15 4 18 0.00  
27 57 51 45 46 41 37 86 71 55 30.37 30.34 30.30 10 9 4 14 4 16 0.00  
28 59 51 43 52 45 38 96 77 57 30.39 30.33 30.30 10 10 7 17 4 21 0.00  
29 56 51 46 52 49 45 100 92 83 30.29 30.22 30.14 10 4 0 16 4 18 0.00 Fog
30 54 52 49 52 50 46 96 91 86 30.24 30.19 30.15 10 9 3 18 5 21 0.00  
31 57 50 43 45 39 33 96 68 40 30.24 30.20 30.15 10 10 10 10 5 - 0.00