Weather History for Livermore, CA

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Tuesday, December 20, 2011

  Actual Average Record
Temperature  
Mean Temperature 46 °F 46 °F  
Max Temperature 60 °F 56 °F 67 °F (1935)
Min Temperature 31 °F 37 °F 23 °F (1978)
Degree Days  
Heating Degree Days 19 19  
Month to date heating degree days 348 352  
Since 1 July heating degree days 816 824  
Cooling Degree Days 0 0  
Month to date cooling degree days 0 0  
Year to date cooling degree days 792 830  
Moisture  
Dew Point 30 °F    
Average Humidity 56    
Maximum Humidity 75    
Minimum Humidity 36    
Precipitation  
Precipitation 0.00 in 0.10 in 0.71 in (1981)
Month to date precipitation 0.02 1.53  
Year to date precipitation 11.68 14.56  
Since 1 July precipitation 1.91 4.66  
Sea Level Pressure  
Sea Level Pressure 30.07 in    
Wind  
Wind Speed 2 mph (ENE)    
Max Wind Speed 9 mph    
Max Gust Speed 10 mph    
Visibility 10 miles    
Events      
T = Trace of Precipitation, MM = Missing Value Source: NWS Daily Summary

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Date:

Astronomy

Dec. 20, 2011 Rise Set
Actual Time 7:18 AM PST 4:51 PM PST
Civil Twilight 6:48 AM PST 5:20 PM PST
Nautical Twilight 6:15 AM PST 5:53 PM PST
Astronomical Twilight 5:43 AM PST 6:25 PM PST
Moon 2:48 AM PST (12/20) 1:29 PM PST (12/20)
Length of Visible Light 10h 32m
Length of Day
9h 33m
Waning Crescent, 20% of the Moon is Illuminated
Dec 20
Waning Crescent
Dec 24
New
Dec 31
First Quarter
Jan 8
Full
Jan 16
Last Quarter

Hourly Weather History & Observations

Time (PST) Temp. Windchill Dew Point Humidity Pressure Visibility Wind Dir Wind Speed Gust Speed Precip Events Conditions
12:53 AM 42.1 °F - 27.0 °F 55% 30.08 in 10.0 mi Calm Calm - N/A   Clear
1:53 AM 39.0 °F 36.8 °F 27.0 °F 62% 30.08 in 10.0 mi East 3.5 mph - N/A   Clear
2:53 AM 37.0 °F - 26.1 °F 65% 30.08 in 10.0 mi Calm Calm - N/A   Clear
3:53 AM 36.0 °F 32.1 °F 26.1 °F 67% 30.08 in 10.0 mi ENE 4.6 mph - N/A   Clear
4:53 AM 33.1 °F 27.7 °F 26.1 °F 75% 30.08 in 10.0 mi East 5.8 mph - N/A   Clear
5:53 AM 32.0 °F - 25.0 °F 75% 30.08 in 10.0 mi Calm Calm - N/A   Clear
6:53 AM 32.0 °F 27.5 °F 25.0 °F 75% 30.09 in 10.0 mi East 4.6 mph - N/A   Clear
7:53 AM 33.1 °F - 26.1 °F 75% 30.10 in 10.0 mi Calm Calm - N/A   Clear
8:53 AM 39.9 °F - 30.9 °F 70% 30.11 in 10.0 mi Calm Calm - N/A   Clear
9:53 AM 45.0 °F - 30.9 °F 58% 30.11 in 10.0 mi Calm Calm - N/A   Clear
10:53 AM 51.1 °F - 32.0 °F 48% 30.10 in 10.0 mi WNW 5.8 mph - N/A   Clear
11:53 AM 55.9 °F - 33.1 °F 42% 30.08 in 10.0 mi Calm Calm - N/A   Clear
12:53 PM 57.0 °F - 36.0 °F 45% 30.06 in 7.0 mi Calm Calm - N/A   Clear
1:53 PM 57.9 °F - 35.1 °F 42% 30.04 in 9.0 mi Calm Calm - N/A   Clear
2:53 PM 60.1 °F - 34.0 °F 38% 30.02 in 10.0 mi SW 4.6 mph - N/A   Clear
3:53 PM 60.1 °F - 33.1 °F 36% 30.03 in 10.0 mi Calm Calm - N/A   Clear
4:53 PM 53.1 °F - 35.1 °F 50% 30.04 in 8.0 mi ENE 6.9 mph - N/A   Clear
5:53 PM 48.0 °F - 34.0 °F 58% 30.05 in 9.0 mi ENE 3.5 mph - N/A   Clear
6:53 PM 45.0 °F - 33.1 °F 63% 30.05 in 9.0 mi Calm Calm - N/A   Clear
7:53 PM 42.1 °F 39.2 °F 32.0 °F 67% 30.05 in 8.0 mi ENE 4.6 mph - N/A   Clear
8:53 PM 42.1 °F 40.2 °F 30.0 °F 62% 30.04 in 10.0 mi East 3.5 mph - N/A   Clear
9:53 PM 37.9 °F - 28.0 °F 68% 30.06 in 10.0 mi Calm Calm - N/A   Clear
10:53 PM 39.0 °F - 28.0 °F 65% 30.07 in 10.0 mi Calm Calm - N/A   Clear
11:53 PM 36.0 °F 33.3 °F 27.0 °F 70% 30.06 in 10.0 mi ENE 3.5 mph - N/A   Clear