Weather History for Livermore, CA

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Saturday, September 17, 2011

  Actual Average Record
Temperature  
Mean Temperature 68 °F 70 °F  
Max Temperature 86 °F 84 °F 99 °F (1991)
Min Temperature 50 °F 56 °F 44 °F (1959)
Degree Days  
Heating Degree Days 0 0  
Month to date heating degree days 0 0  
Since 1 July heating degree days 9 7  
Cooling Degree Days 3 5  
Month to date cooling degree days 129 107  
Year to date cooling degree days 635 732  
Growing Degree Days 17 (Base 50)    
Moisture  
Dew Point 49 °F    
Average Humidity 62    
Maximum Humidity 93    
Minimum Humidity 31    
Precipitation  
Precipitation 0.00 in 0.00 in 0.22 in (1940)
Month to date precipitation T 0.06  
Year to date precipitation 9.77 9.97  
Since 1 July precipitation T 0.07  
Sea Level Pressure  
Sea Level Pressure 29.99 in    
Wind  
Wind Speed 4 mph (West)    
Max Wind Speed 14 mph    
Max Gust Speed 16 mph    
Visibility 10 miles    
Events      
T = Trace of Precipitation, MM = Missing Value Source: NWS Daily Summary

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Date:

Astronomy

Sep. 17, 2011 Rise Set
Actual Time 6:50 AM PDT 7:12 PM PDT
Civil Twilight 6:24 AM PDT 7:38 PM PDT
Nautical Twilight 5:53 AM PDT 8:09 PM PDT
Astronomical Twilight 5:22 AM PDT 8:40 PM PDT
Moon 9:53 PM PDT (9/17) 11:50 AM PDT (9/17)
Length of Visible Light 13h 14m
Length of Day
12h 21m
Waning Gibbous, 76% of the Moon is Illuminated
Sep 17
Waning Gibbous
Sep 20
Last Quarter
Sep 27
New
Oct 3
First Quarter
Oct 11
Full

Hourly Weather History & Observations

Time (PDT) Temp. Heat Index Dew Point Humidity Pressure Visibility Wind Dir Wind Speed Gust Speed Precip Events Conditions
12:53 AM 55.9 °F - 51.1 °F 84% 29.97 in 10.0 mi NNW 3.5 mph - N/A   Clear
1:53 AM 54.0 °F - 50.0 °F 86% 29.97 in 10.0 mi West 5.8 mph - N/A   Clear
2:53 AM 54.0 °F - 50.0 °F 86% 29.98 in 10.0 mi WNW 3.5 mph - N/A   Clear
5:53 AM 51.1 °F - 46.9 °F 86% 29.99 in 10.0 mi Calm Calm - N/A   Clear
6:20 AM 50.0 °F - 44.6 °F 82% 29.99 in 10.0 mi Calm Calm - N/A   Scattered Clouds
6:28 AM 51.8 °F - 44.6 °F 76% 29.99 in 10.0 mi Calm Calm - N/A   Mostly Cloudy
6:53 AM 50.0 °F - 45.0 °F 83% 30.00 in 10.0 mi Calm Calm - N/A   Partly Cloudy
7:53 AM 53.1 °F - 46.0 °F 77% 30.02 in 10.0 mi Calm Calm - N/A   Clear
7:55 AM 53.6 °F - 46.4 °F 77% 30.02 in 10.0 mi Calm Calm - N/A   Clear
9:53 AM 61.0 °F - 50.0 °F 67% 30.04 in 10.0 mi SW 3.5 mph - N/A   Clear
11:53 AM 72.0 °F - 48.9 °F 44% 30.04 in 10.0 mi SSW 5.8 mph - N/A   Clear
12:53 PM 75.9 °F - 51.1 °F 42% 30.02 in 10.0 mi SW 3.5 mph - N/A   Clear
1:53 PM 80.1 °F - 51.1 °F 36% 30.00 in 10.0 mi Variable 3.5 mph - N/A   Clear
2:53 PM 84.0 °F - 50.0 °F 31% 29.98 in 10.0 mi SW 4.6 mph - N/A   Clear
3:53 PM 84.9 °F - 52.0 °F 32% 29.96 in 10.0 mi West 11.5 mph - N/A   Clear
5:53 PM 80.1 °F 79.9 °F 53.1 °F 39% 29.97 in 10.0 mi West 11.5 mph - N/A   Clear
6:53 PM 73.9 °F - 50.0 °F 43% 29.97 in 10.0 mi West 10.4 mph - N/A   Clear
7:53 PM 72.0 °F - 48.9 °F 44% 29.98 in 10.0 mi WNW 6.9 mph - N/A   Clear
8:53 PM 70.0 °F - 46.9 °F 44% 29.99 in 10.0 mi Calm Calm - N/A   Clear
9:53 PM 66.9 °F - 48.9 °F 52% 30.00 in 10.0 mi Calm Calm - N/A   Clear
11:53 PM 61.0 °F - 48.0 °F 62% 30.01 in 10.0 mi Calm Calm - N/A   Clear