Weather History for Half Moon Bay, CA

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Month of December, 2011

  Max Avg Min Sum
Temperature  
Max Temperature 66 °F 57 °F 50 °F
Mean Temperature 60 °F 47 °F 42 °F
Min Temperature 55 °F 38 °F 32 °F
Degree Days  
Heating Degree Days (base 65) 23 17 4 538
Cooling Degree Days (base 65) 0 0 0 0
Growing Degree Days (base 50) 10 1 0 22
Dew Point  
Dew Point 55 °F 37 °F 7 °F
Precipitation  
Precipitation 0.00 in 0.00 in 0.00 in 0.00 in
Snowdepth - - - -
Wind  
Wind 33 mph 5 mph 0 mph
Gust Wind 46 mph 22 mph 16 mph
Sea Level Pressure  
Sea Level Pressure 30.58 in 30.19 in 29.74 in

Monthly Weather History Graph

Monthly Weather History Graph

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Date:

Astronomy

Dec. 13, 2011 Rise Set
Actual Time 7:15 AM PST 4:52 PM PST
Civil Twilight 6:46 AM PST 5:21 PM PST
Nautical Twilight 6:13 AM PST 5:54 PM PST
Astronomical Twilight 5:42 AM PST 6:26 PM PST
Moon 8:10 PM PST (12/13) 9:31 AM PST (12/13)
Length of Visible Light 10h 34m
Length of Day
9h 36m
Waning Gibbous, 90% of the Moon is Illuminated
Dec 13
Waning Gibbous
Dec 17
Last Quarter
Dec 24
New
Dec 31
First Quarter
Jan 8
Full

Weather History Calendar

Precipitation Actual month total 0.00 Average Month Total: 3.94
Sunday Monday Tuesday Wednesday Thursday Friday Saturday
 
Clear
Actual:
66 | 55 0.00
Average:
61 | 43 0.10
Scattered Clouds
Actual:
66 | 51 0.00
Average:
60 | 45 0.20
Clear
Actual:
64 | 44 0.00
Average:
60 | 44 0.15
Scattered Clouds
Actual:
53 | 35 0.00
Average:
60 | 44 0.18
Clear
Actual:
59 | 37 0.00
Average:
61 | 44 0.10
Clear
Actual:
57 | 35 0.00
Average:
59 | 44 0.13
Clear
Actual:
57 | 32 0.00
Average:
60 | 45 0.10
Clear
Actual:
57 | 33 0.00
Average:
60 | 44 0.09
Rain
Actual:
57 | 33 0.00
Average:
59 | 45 0.09
Partly Cloudy
Actual:
55 | 35 0.00
Average:
58 | 43 0.11
Rain
Actual:
51 | 42 0.00
Average:
58 | 43 0.09
Rain
Actual:
51 | 42 0.00
Average:
58 | 43 0.08
Partly Cloudy
Actual:
53 | 35 0.00
Average:
58 | 42 0.07
Scattered Clouds
Actual:
53 | 37 0.00
Average:
58 | 43 0.13
Rain
Actual:
53 | 37 0.00
Average:
58 | 43 0.16
Clear
Actual:
60 | 33 0.00
Average:
59 | 43 0.08
Clear
Actual:
59 | 35 0.00
Average:
60 | 44 0.12
Partly Cloudy
Actual:
51 | 33 0.00
Average:
58 | 42 0.06
Scattered Clouds
Actual:
53 | 39 0.00
Average:
57 | 41 0.11
Fog
Actual:
59 | 35 0.00
Average:
57 | 41 0.18
Partly Cloudy
Actual:
62 | 32 0.00
Average:
56 | 41 0.20
Clear
Actual:
59 | 41 0.00
Average:
55 | 41 0.30
Scattered Clouds
Actual:
55 | 32 0.00
Average:
56 | 40 0.09
Clear
Actual:
57 | 33 0.00
Average:
57 | 41 0.09
Scattered Clouds
Actual:
57 | 33 0.00
Average:
59 | 41 0.11
Overcast
Actual:
50 | 44 0.00
Average:
58 | 42 0.07
Scattered Clouds
Actual:
59 | 39 0.00
Average:
58 | 43 0.24
Fog
Actual:
55 | 41 0.00
Average:
57 | 43 0.16
Fog
Actual:
55 | 46 0.00
Average:
58 | 42 0.16
Rain
Actual:
53 | 48 0.00
Average:
58 | 42 0.13
Clear
Actual:
59 | 42 0.00
Average:
57 | 42 0.06
 

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 66 60 55 28 19 14 33 20 13 30.23 30.14 30.03 10 10 10 33 23 46 0.00  
2 66 58 51 50 35 14 94 49 15 30.05 30.00 29.97 10 8 3 18 11 32 0.00  
3 64 54 44 23 14 9 43 19 13 30.25 30.13 30.01 10 10 10 24 14 34 0.00  
4 53 44 35 48 35 19 100 68 38 30.29 30.24 30.16 10 9 4 8 2 - 0.00  
5 59 48 37 45 28 19 87 49 22 30.30 30.22 30.15 10 10 5 15 5 28 0.00  
6 57 46 35 45 35 28 81 65 48 30.40 30.35 30.32 10 10 7 10 3 - 0.00  
7 57 44 32 46 37 28 100 76 36 30.36 30.26 30.17 10 9 5 17 3 22 0.00  
8 57 45 33 48 40 34 100 87 51 30.17 30.14 30.10 10 8 5 12 1 - 0.00  
9 57 45 33 48 38 32 93 79 54 30.20 30.16 30.13 10 7 4 7 1 - 0.00 Rain
10 55 45 35 50 41 32 100 87 67 30.15 30.11 30.04 10 6 2 7 2 - 0.00  
11 51 46 42 46 44 41 100 88 76 30.06 29.95 29.86 10 9 2 7 3 - 0.00 Rain
12 51 48 42 46 43 39 100 84 66 29.85 29.78 29.74 10 9 7 16 4 22 0.00 Rain
13 53 44 35 48 42 36 100 90 72 30.09 30.00 29.89 10 7 2 12 3 - 0.00  
14 53 45 37 46 41 37 100 89 67 30.31 30.25 30.16 10 9 6 13 2 - 0.00  
15 53 46 37 50 44 37 100 90 62 30.30 30.23 30.20 10 9 2 13 5 18 0.00 Rain
16 60 46 33 45 36 34 100 72 36 30.26 30.20 30.15 10 10 8 14 4 20 0.00  
17 59 47 35 46 38 32 100 74 44 30.18 30.13 30.10 10 10 5 9 3 - 0.00  
18 51 42 33 48 42 32 100 89 82 30.23 30.17 30.13 10 9 5 10 2 - 0.00  
19 53 46 39 48 45 37 100 92 72 30.12 30.08 30.03 10 7 4 16 6 - 0.00  
20 59 47 35 46 36 27 100 73 29 30.11 30.07 30.04 10 8 0 17 4 - 0.00 Fog
21 62 47 32 48 37 21 100 70 26 30.12 30.08 30.04 10 8 4 17 4 23 0.00  
22 59 50 41 23 12 7 46 21 13 30.48 30.30 30.13 10 10 6 18 8 33 0.00  
23 55 44 32 46 30 18 77 59 42 30.58 30.51 30.47 10 10 7 12 2 - 0.00  
24 57 45 33 37 26 10 75 45 17 30.50 30.41 30.35 10 9 5 15 3 25 0.00  
25 57 45 33 46 33 25 100 64 41 30.43 30.37 30.32 10 8 3 17 3 21 0.00  
26 50 47 44 50 47 43 100 96 87 30.35 30.32 30.29 10 7 3 12 5 - 0.00  
27 59 49 39 46 43 36 100 82 48 30.36 30.33 30.30 10 9 5 20 5 25 0.00  
28 55 48 41 54 49 39 100 96 82 30.38 30.34 30.29 10 8 0 18 6 23 0.00 Fog
29 55 50 46 55 52 46 100 100 100 30.29 30.21 30.15 10 3 0 15 5 20 0.00 Fog
30 53 50 48 54 53 48 100 100 100 30.24 30.20 30.16 10 3 0 9 2 - 0.00 Fog , Rain
31 59 50 42 48 38 32 100 57 36 30.23 30.16 30.10 10 10 5 28 7 36 0.00