Weather History for Half Moon Bay, CA

Friday, December 21, 2012 — View Current Weather Conditions
Friday, December 21, 2012
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Daily Weekly Monthly Custom
  Actual Average Record
Temperature
Mean Temperature 52 °F -  
Max Temperature 53 °F 56 °F 62 °F (2011)
Min Temperature 51 °F 41 °F 32 °F (2011)
Degree Days
Heating Degree Days 13    
Growing Degree Days 2 (Base 50)    
Moisture
Dew Point 50 °F    
Average Humidity 87    
Maximum Humidity 100    
Minimum Humidity 77    
Precipitation
Precipitation 0.29 in - - ()
Sea Level Pressure
Sea Level Pressure 29.93 in    
Wind
Wind Speed 24 mph (South)    
Max Wind Speed 32 mph    
Max Gust Speed 45 mph    
Visibility 5 miles    
Events Rain    
Averages and records for this station are not official NWS values.
T = Trace of Precipitation, MM = Missing Value Source: NWS Daily Summary
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Local Photos
Welcome to Alcatraz
Mother Nature couldn't have picked more appropriate weather for a visit to this infamous prison if she tried.
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Astronomy
Dec. 21, 2012 Rise Set
Actual Time 7:21 AM PST 4:55 PM PST
Civil Twilight 6:51 AM PST 5:24 PM PST
Nautical Twilight 6:19 AM PST 5:57 PM PST
Astronomical Twilight 5:47 AM PST 6:29 PM PST
Moon 12:41 PM PST (12/21) 1:18 AM PST (12/21)
Length Of Visible Light 10h 33m
Length of Day
9h 34m
Waxing Gibbous, 66% of the Moon is Illuminated
Dec 21
Waxing Gibbous
Dec 28
Full
Jan 4
Last Quarter
Jan 11
New
Jan 18
First Quarter
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Hourly Weather History & Observations
Time (PST) Temp. Dew Point Humidity Pressure Visibility Wind Dir Wind Speed Gust Speed Precip Events Conditions
12:15 AM 53.6 °F 48.2 °F 82% 30.00 in 8.0 mi South 21.9 mph - N/A   Overcast
12:35 AM 53.6 °F 48.2 °F 82% 30.00 in 8.0 mi South 20.7 mph 31.1 mph N/A   Overcast
12:55 AM 53.6 °F 48.2 °F 82% 30.00 in 8.0 mi South 21.9 mph 33.4 mph N/A   Overcast
1:15 AM 53.6 °F 48.2 °F 82% 29.99 in 8.0 mi South 23.0 mph 31.1 mph N/A   Overcast
1:35 AM 53.6 °F 48.2 °F 82% 29.98 in 7.0 mi South 24.2 mph 34.5 mph N/A   Overcast
1:55 AM 53.6 °F 48.2 °F 82% 29.98 in 7.0 mi South 23.0 mph 33.4 mph N/A   Overcast
2:15 AM 53.6 °F 46.4 °F 77% 29.97 in 8.0 mi South 21.9 mph 33.4 mph N/A   Overcast
2:35 AM 53.6 °F 46.4 °F 77% 29.97 in 9.0 mi South 25.3 mph 32.2 mph N/A   Overcast
3:15 AM 53.6 °F 46.4 °F 77% 29.96 in 10.0 mi South 25.3 mph 31.1 mph N/A   Overcast
3:35 AM 53.6 °F 46.4 °F 77% 29.96 in 9.0 mi South 18.4 mph 29.9 mph N/A   Overcast
3:55 AM 53.6 °F 46.4 °F 77% 29.95 in 9.0 mi South 25.3 mph 31.1 mph N/A   Overcast
4:15 AM 53.6 °F 46.4 °F 77% 29.94 in 10.0 mi South 24.2 mph 31.1 mph N/A   Overcast
4:35 AM 53.6 °F 46.4 °F 77% 29.94 in 9.0 mi South 21.9 mph 33.4 mph N/A   Overcast
4:55 AM 53.6 °F 46.4 °F 77% 29.93 in 10.0 mi South 24.2 mph 32.2 mph N/A   Overcast
5:15 AM 53.6 °F 46.4 °F 77% 29.93 in 9.0 mi South 20.7 mph 34.5 mph N/A   Overcast
5:35 AM 53.6 °F 46.4 °F 77% 29.93 in 10.0 mi South 21.9 mph 32.2 mph N/A   Overcast
5:55 AM 53.6 °F 46.4 °F 77% 29.93 in 9.0 mi South 23.0 mph 31.1 mph N/A   Overcast
6:15 AM 53.6 °F 46.4 °F 77% 29.93 in 9.0 mi South 25.3 mph 34.5 mph N/A   Overcast
6:35 AM 53.6 °F 46.4 °F 77% 29.94 in 10.0 mi South 25.3 mph 34.5 mph N/A   Overcast
6:55 AM 53.6 °F 46.4 °F 77% 29.94 in 8.0 mi South 28.8 mph 32.2 mph N/A   Overcast
7:15 AM 53.6 °F 48.2 °F 82% 29.93 in 7.0 mi South 26.5 mph 34.5 mph N/A   Overcast
7:35 AM 53.6 °F 46.4 °F 77% 29.92 in 7.0 mi South 26.5 mph 36.8 mph N/A   Overcast
7:55 AM 53.6 °F 46.4 °F 77% 29.91 in 7.0 mi South 29.9 mph 40.3 mph N/A   Mostly Cloudy
8:15 AM 53.6 °F 48.2 °F 82% 29.93 in 5.0 mi South 25.3 mph 36.8 mph N/A   Haze
8:35 AM 53.6 °F 48.2 °F 82% 29.92 in 5.0 mi South 27.6 mph 34.5 mph N/A   Haze
8:55 AM 53.6 °F 48.2 °F 82% 29.92 in 5.0 mi South 32.2 mph 38.0 mph N/A   Haze
9:15 AM 53.6 °F 48.2 °F 82% 29.92 in 5.0 mi South 27.6 mph 35.7 mph N/A   Haze
9:35 AM 53.6 °F 48.2 °F 82% 29.93 in 5.0 mi South 24.2 mph 32.2 mph N/A   Haze
9:55 AM 53.6 °F 48.2 °F 82% 29.95 in 1.2 mi South 21.9 mph 35.7 mph 0.02 in Rain Rain
10:15 AM 51.8 °F 50.0 °F 94% 29.94 in 1.8 mi South 28.8 mph 39.1 mph 0.01 in Rain Light Rain
10:35 AM 53.6 °F 50.0 °F 88% 29.94 in 2.5 mi South 25.3 mph 36.8 mph 0.02 in Rain Light Rain
10:55 AM 53.6 °F 50.0 °F 88% 29.94 in 1.2 mi South 27.6 mph 38.0 mph 0.02 in Rain Light Rain
11:15 AM 53.6 °F 50.0 °F 88% 29.94 in 1.5 mi South 31.1 mph 36.8 mph 0.02 in Rain Light Rain
11:35 AM 51.8 °F 50.0 °F 94% 29.94 in 1.0 mi South 26.5 mph 35.7 mph 0.05 in Rain Light Rain
11:55 AM 51.8 °F 50.0 °F 94% 29.93 in 0.8 mi South 25.3 mph 33.4 mph 0.06 in Rain Light Rain
12:15 PM 53.6 °F 50.0 °F 88% 29.92 in 1.0 mi South 27.6 mph 35.7 mph N/A Rain Light Rain
12:35 PM 53.6 °F 50.0 °F 88% 29.91 in 3.0 mi South 26.5 mph 36.8 mph N/A   Mostly Cloudy
12:55 PM 51.8 °F 50.0 °F 94% 29.92 in 0.8 mi SSW 19.6 mph 38.0 mph N/A   Overcast
1:15 PM 51.8 °F 50.0 °F 94% 29.90 in 0.8 mi South 24.2 mph 36.8 mph 0.01 in Rain Light Rain
1:35 PM 53.6 °F 50.0 °F 88% 29.91 in 0.8 mi South 23.0 mph 40.3 mph 0.02 in Rain Light Rain
1:55 PM 53.6 °F 50.0 °F 88% 29.90 in 1.2 mi South 26.5 mph 38.0 mph 0.03 in Rain Light Rain
2:15 PM 53.6 °F 51.8 °F 94% 29.90 in 0.8 mi South 23.0 mph 35.7 mph N/A Rain Light Rain
2:35 PM 53.6 °F 51.8 °F 94% 29.89 in 1.5 mi South 29.9 mph 44.9 mph 0.01 in Rain Light Rain
2:55 PM 53.6 °F 51.8 °F 94% 29.90 in 0.8 mi South 26.5 mph 41.4 mph 0.02 in Rain Light Rain
3:15 PM 53.6 °F 51.8 °F 94% 29.90 in 1.0 mi South 26.5 mph 36.8 mph 0.01 in Rain Light Rain
3:35 PM 53.6 °F 51.8 °F 94% 29.91 in 0.8 mi South 23.0 mph 32.2 mph 0.03 in Rain Light Rain
3:55 PM 53.6 °F 51.8 °F 94% 29.92 in 0.8 mi SSW 25.3 mph 34.5 mph 0.07 in Rain Light Rain
4:15 PM 53.6 °F 51.8 °F 94% 29.92 in 1.2 mi South 24.2 mph 35.7 mph 0.01 in Rain Light Rain
4:35 PM 53.6 °F 51.8 °F 94% 29.92 in 3.0 mi SSW 20.7 mph 29.9 mph 0.01 in   Overcast
4:55 PM 53.6 °F 51.8 °F 94% 29.92 in 5.0 mi South 20.7 mph 31.1 mph 0.02 in   Mostly Cloudy
5:15 PM 53.6 °F 51.8 °F 94% 29.92 in 5.0 mi South 23.0 mph 32.2 mph N/A   Overcast
5:35 PM 53.6 °F 51.8 °F 94% 29.92 in 5.0 mi South 21.9 mph 29.9 mph N/A   Overcast
5:55 PM 53.6 °F 51.8 °F 94% 29.92 in 6.0 mi South 19.6 mph 26.5 mph N/A   Mostly Cloudy
6:15 PM 53.6 °F 51.8 °F 94% 29.92 in 6.0 mi South 21.9 mph 27.6 mph N/A   Overcast
6:35 PM 53.6 °F 51.8 °F 94% 29.92 in 5.0 mi South 16.1 mph - N/A   Overcast
6:55 PM 53.6 °F 51.8 °F 94% 29.93 in 5.0 mi South 17.3 mph 21.9 mph N/A   Overcast
7:15 PM 53.6 °F 51.8 °F 94% 29.92 in 5.0 mi South 18.4 mph 23.0 mph N/A   Overcast
7:35 PM 53.6 °F 51.8 °F 94% 29.92 in 5.0 mi South 19.6 mph 25.3 mph N/A   Overcast
7:55 PM 53.6 °F 51.8 °F 94% 29.92 in 2.0 mi South 16.1 mph 27.6 mph N/A Rain Light Rain
8:15 PM 53.6 °F 51.8 °F 94% 29.92 in 5.0 mi SSW 19.6 mph 26.5 mph N/A   Overcast
8:35 PM 53.6 °F 51.8 °F 94% 29.92 in 5.0 mi South 23.0 mph 29.9 mph N/A   Overcast
8:55 PM 53.6 °F 51.8 °F 94% 29.92 in 5.0 mi South 20.7 mph 31.1 mph N/A   Overcast
9:15 PM 53.6 °F 51.8 °F 94% 29.92 in 6.0 mi South 21.9 mph 31.1 mph N/A   Overcast
9:35 PM 53.6 °F 51.8 °F 94% 29.92 in 1.0 mi South 19.6 mph 28.8 mph 0.02 in   Overcast
9:55 PM 53.6 °F 53.6 °F 100% 29.92 in 3.0 mi South 23.0 mph 31.1 mph 0.03 in   Overcast
10:15 PM 53.6 °F 51.8 °F 94% 29.91 in 5.0 mi South 26.5 mph 35.7 mph N/A   Overcast
10:35 PM 53.6 °F 51.8 °F 94% 29.89 in 3.0 mi South 26.5 mph 35.7 mph 0.02 in   Overcast
10:55 PM 53.6 °F 51.8 °F 94% 29.89 in 5.0 mi South 26.5 mph 35.7 mph 0.02 in   Overcast
11:15 PM 53.6 °F 51.8 °F 94% 29.89 in 4.0 mi South 29.9 mph 36.8 mph N/A   Overcast
11:35 PM 53.6 °F 51.8 °F 94% 29.89 in 5.0 mi South 26.5 mph 39.1 mph N/A   Overcast
11:55 PM 53.6 °F 51.8 °F 94% 29.88 in 4.0 mi South 25.3 mph 38.0 mph N/A Rain Light Rain
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