Weather History for San Francisco, CA

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Month of December, 2012

  Max Avg Min Sum
Temperature  
Max Temperature 66 °F 57 °F 49 °F
Mean Temperature 61 °F 52 °F 44 °F
Min Temperature 58 °F 46 °F 36 °F
Degree Days  
Heating Degree Days (base 65) 21 13 4 400
Cooling Degree Days (base 65) 0 0 0 0
Growing Degree Days (base 50) 10 3 0 87
Dew Point  
Dew Point 59 °F 43 °F 18 °F
Precipitation  
Precipitation 1.35 in 0.23 in 0.00 in 6.24 in
Snowdepth - - - -
Wind  
Wind 44 mph 8 mph 0 mph
Gust Wind 53 mph 28 mph 16 mph
Sea Level Pressure  
Sea Level Pressure 30.32 in 30.06 in 29.76 in

Monthly Weather History Graph

Monthly Weather History Graph

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Date:

Astronomy

Dec. 31, 2012 Rise Set
Actual Time 7:24 AM PST 5:01 PM PST
Civil Twilight 6:55 AM PST 5:30 PM PST
Nautical Twilight 6:22 AM PST 6:03 PM PST
Astronomical Twilight 5:50 AM PST 6:35 PM PST
Moon 8:33 PM PST (12/31) 9:12 AM PST (12/31)
Length of Visible Light 10h 35m
Length of Day
9h 36m
Waning Gibbous, 89% of the Moon is Illuminated
Dec 31
Waning Gibbous
Jan 4
Last Quarter
Jan 11
New
Jan 18
First Quarter
Jan 26
Full

Weather History Calendar

Precipitation Actual month total 6.24 Normal Month Total: 4.03
Sunday Monday Tuesday Wednesday Thursday Friday Saturday
 
Rain
Actual:
64 | 58 0.82
Average:
59 | 46 0.11
Rain
Actual:
64 | 51 0.92
Average:
59 | 46 0.10
Partly Cloudy
Actual:
59 | 46 0.00
Average:
58 | 46 0.11
Rain
Actual:
62 | 52 T
Average:
58 | 46 0.11
Rain
Actual:
62 | 58 0.50
Average:
58 | 46 0.11
Partly Cloudy
Actual:
60 | 51 0.00
Average:
58 | 46 0.11
Scattered Clouds
Actual:
60 | 46 0.00
Average:
58 | 45 0.13
Partly Cloudy
Actual:
59 | 46 0.00
Average:
57 | 45 0.12
Scattered Clouds
Actual:
65 | 46 0.00
Average:
57 | 45 0.12
Clear
Actual:
66 | 52 0.00
Average:
57 | 45 0.11
Rain
Actual:
58 | 46 T
Average:
57 | 45 0.12
Rain
Actual:
55 | 46 0.10
Average:
57 | 45 0.12
Scattered Clouds
Actual:
54 | 42 0.00
Average:
57 | 45 0.12
Partly Cloudy
Actual:
53 | 42 T
Average:
57 | 45 0.13
Rain
Actual:
49 | 40 0.12
Average:
56 | 45 0.13
Rain
Actual:
57 | 47 0.01
Average:
56 | 44 0.13
Rain
Actual:
59 | 50 0.15
Average:
56 | 44 0.13
Scattered Clouds
Actual:
53 | 44 0.00
Average:
56 | 44 0.14
Scattered Clouds
Actual:
51 | 36 0.00
Average:
56 | 44 0.14
Partly Cloudy
Actual:
60 | 37 0.00
Average:
56 | 44 0.15
Rain
Actual:
58 | 52 0.32
Average:
56 | 44 0.15
Rain
Actual:
59 | 50 0.57
Average:
56 | 44 0.15
Rain
Actual:
61 | 51 1.35
Average:
56 | 44 0.15
Partly Cloudy
Actual:
56 | 46 T
Average:
56 | 44 0.15
Rain
Actual:
54 | 44 0.90
Average:
56 | 44 0.15
Rain
Actual:
55 | 48 0.20
Average:
56 | 44 0.14
Partly Cloudy
Actual:
54 | 46 0.00
Average:
56 | 44 0.14
Rain
Actual:
50 | 41 0.17
Average:
56 | 44 0.14
Rain
Actual:
54 | 44 0.11
Average:
56 | 44 0.14
Scattered Clouds
Actual:
55 | 40 0.00
Average:
56 | 44 0.14
Partly Cloudy
Actual:
53 | 37 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

2012 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 64 61 58 58 55 52 93 83 72 30.04 29.97 29.89 10 6 2 25 13 33 0.82 Rain
2 64 58 51 59 53 44 93 77 60 30.11 29.90 29.76 10 8 2 44 17 53 0.92 Rain
3 59 53 46 48 46 42 93 75 57 30.21 30.17 30.12 10 10 10 7 2 7 0.00  
4 62 57 52 56 50 42 83 66 48 30.23 30.19 30.14 10 10 9 18 6 24 T Rain
5 62 60 58 58 57 55 90 87 84 30.17 30.13 30.09 10 8 2 18 7 22 0.50 Rain
6 60 56 51 55 48 45 93 78 62 30.14 30.12 30.08 10 10 6 21 9 24 0.00  
7 60 53 46 50 46 42 86 75 64 30.16 30.11 30.08 10 10 10 15 5 16 0.00  
8 59 53 46 48 45 38 89 67 44 30.12 30.07 30.05 10 10 9 12 4 15 0.00  
9 65 56 46 47 42 38 86 63 40 30.19 30.14 30.10 10 10 10 9 2 10 0.00  
10 66 59 52 49 45 42 77 61 45 30.23 30.17 30.11 10 10 10 17 6 21 0.00  
11 58 52 46 50 46 41 89 80 71 30.10 29.98 29.88 10 8 0 22 7 26 T Fog , Rain
12 55 51 46 49 42 37 89 72 54 29.91 29.88 29.85 10 10 5 18 8 24 0.10 Rain
13 54 48 42 40 38 36 82 64 46 29.94 29.90 29.87 10 10 10 13 5 16 0.00  
14 53 48 42 43 40 37 83 71 59 30.03 29.92 29.83 10 10 10 12 4 13 T  
15 49 45 40 44 40 37 86 79 71 30.09 30.04 30.00 10 10 6 20 6 25 0.12 Rain
16 57 52 47 51 45 41 86 79 71 30.11 30.06 30.03 10 10 3 16 6 23 0.01 Rain
17 59 55 50 54 48 39 93 78 63 30.08 30.02 29.99 10 8 1 21 12 26 0.15 Rain
18 53 49 44 38 31 28 66 54 41 30.21 30.08 30.01 10 10 10 28 13 33 0.00  
19 51 44 36 34 29 18 82 55 27 30.32 30.26 30.21 10 10 10 9 3 10 0.00  
20 60 49 37 41 36 30 79 62 44 30.22 30.10 30.00 10 10 10 30 13 39 0.00  
21 58 55 52 52 47 40 93 74 55 29.99 29.91 29.86 10 8 2 35 17 43 0.32 Rain
22 59 55 50 52 47 44 96 79 62 30.08 29.95 29.84 10 8 4 32 15 52 0.57 Rain
23 61 56 51 57 51 45 93 83 72 30.07 29.95 29.86 10 7 2 38 16 47 1.35 Rain
24 56 51 46 45 42 37 93 74 54 30.22 30.16 30.05 10 10 10 13 5 15 T  
25 54 49 44 48 42 38 86 79 71 30.15 29.96 29.79 10 10 5 26 7 36 0.90 Rain
26 55 52 48 49 43 40 80 73 66 30.12 30.00 29.89 10 9 3 26 14 33 0.20 Rain
27 54 50 46 44 40 36 82 68 54 30.18 30.14 30.10 10 10 10 15 6 20 0.00  
28 50 46 41 41 39 37 89 75 61 30.19 30.12 30.04 10 10 6 13 5 14 0.17 Rain
29 54 49 44 43 40 37 82 71 59 30.09 30.05 30.01 10 9 5 20 8 22 0.11 Rain
30 55 48 40 42 38 32 89 70 50 30.18 30.10 30.06 10 10 10 15 4 17 0.00  
31 53 45 37 39 33 25 76 56 35 30.30 30.26 30.20 10 10 10 9 3 21 0.00