Weather History for San Francisco, CA

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Month of January, 2004

  Max Avg Min Sum
Temperature  
Max Temperature 61 °F 55 °F 48 °F
Mean Temperature 56 °F 50 °F 42 °F
Min Temperature 51 °F 45 °F 35 °F
Degree Days  
Heating Degree Days (base 65) 24 15 9 461
Cooling Degree Days (base 65) 0 0 0 0
Growing Degree Days (base 50) 6 1 0 40
Dew Point  
Dew Point 55 °F 45 °F 31 °F
Precipitation  
Precipitation 2.16 in 0.10 in 0.00 in 3.03 in
Snowdepth - - - -
Wind  
Wind 44 mph 6 mph 0 mph
Gust Wind 54 mph 26 mph 16 mph
Sea Level Pressure  
Sea Level Pressure 30.42 in 30.15 in 29.83 in

Monthly Weather History Graph

Monthly Weather History Graph

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Date:

Astronomy

Jan. 21, 2004 Rise Set
Actual Time 7:21 AM PST 5:20 PM PST
Civil Twilight 6:52 AM PST 5:49 PM PST
Nautical Twilight 6:20 AM PST 6:20 PM PST
Astronomical Twilight 5:49 AM PST 6:52 PM PST
Moon 7:38 AM PST (1/21) 5:14 PM PST (1/21)
Length of Visible Light 10h 56m
Length of Day
9h 59m
Waning Crescent, 0% of the Moon is Illuminated
Jan 21
Waning Crescent
Jan 21
New
Jan 28
First Quarter
Feb 6
Full
Feb 13
Last Quarter

Weather History Calendar

Precipitation Actual month total 3.03 Average Month Total: 4.60
Sunday Monday Tuesday Wednesday Thursday Friday Saturday
 
Rain
Actual:
55 | 45 2.16
Average:
54 | 40 0.11
Rain
Actual:
51 | 39 0.26
Average:
53 | 40 0.14
Scattered Clouds
Actual:
50 | 39 0.00
Average:
54 | 40 0.14
Partly Cloudy
Actual:
48 | 35 0.00
Average:
53 | 40 0.35
Partly Cloudy
Actual:
53 | 39 0.00
Average:
54 | 41 0.07
Rain
Actual:
51 | 45 0.06
Average:
53 | 40 0.11
Rain
Actual:
57 | 46 0.00
Average:
53 | 41 0.07
Mostly Cloudy
Actual:
60 | 51 0.00
Average:
54 | 42 0.12
Rain
Actual:
61 | 51 0.16
Average:
54 | 42 0.13
Rain
Actual:
59 | 51 0.01
Average:
55 | 42 0.11
Partly Cloudy
Actual:
60 | 46 0.00
Average:
54 | 42 0.17
Fog
Actual:
54 | 46 0.01
Average:
55 | 43 0.18
Fog
Actual:
55 | 46 0.00
Average:
56 | 42 0.20
Rain
Actual:
50 | 46 0.02
Average:
56 | 42 0.24
Mostly Cloudy
Actual:
54 | 46 0.00
Average:
56 | 43 0.13
Mostly Cloudy
Actual:
53 | 50 0.00
Average:
57 | 44 0.20
Partly Cloudy
Actual:
54 | 48 0.00
Average:
56 | 43 0.11
Partly Cloudy
Actual:
55 | 48 0.00
Average:
57 | 43 0.23
Mostly Cloudy
Actual:
54 | 50 0.00
Average:
56 | 43 0.05
Partly Cloudy
Actual:
55 | 46 0.01
Average:
56 | 43 0.17
Clear
Actual:
57 | 45 0.00
Average:
57 | 43 0.19
Clear
Actual:
59 | 39 0.00
Average:
57 | 43 0.15
Rain
Actual:
52 | 42 0.05
Average:
56 | 42 0.15
Rain
Actual:
55 | 48 0.20
Average:
57 | 42 0.17
Partly Cloudy
Actual:
54 | 44 0.00
Average:
57 | 42 0.11
Mostly Cloudy
Actual:
55 | 46 0.00
Average:
57 | 43 0.12
Rain
Actual:
57 | 50 0.04
Average:
56 | 42 0.11
Partly Cloudy
Actual:
57 | 44 0.00
Average:
56 | 42 0.11
Overcast
Actual:
52 | 48 0.00
Average:
56 | 42 0.21
Rain
Actual:
55 | 48 0.05
Average:
56 | 42 0.14
Scattered Clouds
Actual:
55 | 42 0.00
Average:
56 | 42 0.11
 

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

2004 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 55 50 45 52 47 42 90 84 71 30.10 29.95 29.83 10 6 1 44 17 54 2.16 Rain
2 51 45 39 45 41 36 97 83 68 30.13 30.07 30.02 10 10 5 15 5 - 0.26 Rain
3 50 46 39 38 35 32 89 70 50 30.34 30.26 30.13 10 10 10 9 5 - 0.00  
4 48 42 35 40 37 34 97 80 66 30.42 30.36 30.32 10 10 10 9 3 - 0.00  
5 53 46 39 39 35 31 83 65 45 30.35 30.28 30.20 10 10 10 13 7 - 0.00  
6 51 48 45 44 39 36 83 71 59 30.19 30.07 29.98 10 9 8 9 3 - 0.06 Rain
7 57 52 46 49 44 36 90 73 51 30.08 30.03 29.95 10 10 8 17 7 - 0.00 Rain
8 60 56 51 50 46 40 92 74 55 30.11 30.08 30.06 10 10 8 18 5 24 0.00  
9 61 56 51 55 51 42 100 86 60 30.22 30.15 30.06 10 7 2 21 7 30 0.16 Rain
10 59 55 51 54 51 50 100 90 75 30.20 30.15 30.07 10 8 2 7 2 - 0.01 Rain
11 60 53 46 52 50 46 100 88 67 30.06 30.02 29.97 10 9 6 8 3 - 0.00  
12 54 50 46 51 49 46 100 94 88 30.25 30.15 30.04 5 3 0 6 3 - 0.01 Fog
13 55 50 46 48 47 45 100 91 72 30.28 30.25 30.21 9 4 0 10 5 - 0.00 Fog
14 50 48 46 48 45 44 93 89 83 30.21 30.15 30.10 7 5 3 8 4 - 0.02 Fog , Rain
15 54 50 46 51 49 45 97 92 86 30.10 30.06 30.01 10 7 3 12 2 - 0.00  
16 53 52 50 52 48 44 100 86 71 30.10 30.05 30.02 10 8 5 10 5 - 0.00  
17 54 51 48 46 44 42 83 78 69 30.13 30.09 30.05 9 8 6 15 7 - 0.00  
18 55 52 48 50 46 44 93 82 69 30.20 30.17 30.12 9 7 4 10 7 - 0.00  
19 54 52 50 50 49 47 100 92 83 30.21 30.16 30.10 10 6 2 9 6 - 0.00  
20 55 52 46 50 47 44 96 84 72 30.16 30.10 30.08 10 10 5 14 6 - 0.01  
21 57 51 45 47 41 35 93 72 42 30.33 30.25 30.17 10 10 8 14 3 - 0.00  
22 59 49 39 48 42 35 89 78 41 30.38 30.31 30.27 10 10 10 13 4 - 0.00  
23 52 47 42 48 44 41 97 87 71 30.27 30.17 30.05 10 8 4 15 5 - 0.05 Rain
24 55 52 48 50 47 41 97 88 74 30.07 30.03 29.97 10 6 2 26 8 32 0.20 Rain
25 54 49 44 43 39 36 86 71 54 30.22 30.16 30.08 10 10 10 12 6 - 0.00  
26 55 50 46 47 44 42 90 79 64 30.25 30.21 30.17 10 10 10 15 5 - 0.00  
27 57 54 50 53 50 46 100 90 82 30.24 30.18 30.14 10 9 5 16 10 23 0.04 Rain
28 57 50 44 49 47 43 97 89 74 30.31 30.26 30.23 10 10 7 17 5 21 0.00  
29 52 50 48 50 49 48 97 92 86 30.28 30.23 30.19 10 8 4 9 4 - 0.00  
30 55 52 48 51 46 39 100 83 64 30.21 30.16 30.10 10 9 2 21 8 25 0.05 Rain
31 55 48 42 43 39 35 80 67 51 30.13 30.10 30.06 10 10 9 22 10 28 0.00