Weather History for Seattle, WA

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Saturday, December 17, 2011

  Actual Average Record
Temperature  
Mean Temperature 42 °F 40 °F  
Max Temperature 50 °F 45 °F 57 °F (1994)
Min Temperature 33 °F 35 °F 11 °F (1964)
Degree Days  
Heating Degree Days 23 25  
Month to date heating degree days 476 410  
Since 1 July heating degree days 1668 1593  
Cooling Degree Days 0 0  
Month to date cooling degree days 0 0  
Year to date cooling degree days 148 189  
Moisture  
Dew Point 36 °F    
Average Humidity 83    
Maximum Humidity 100    
Minimum Humidity 66    
Precipitation  
Precipitation 0.00 in 0.16 in 1.61 in (1979)
Month to date precipitation 0.06 3.03  
Year to date precipitation 34.22 35.17  
Snow  
Snow 0.00 in - 0.10 in (1992)
Month to date snowfall 0.0  
Since 1 July snowfall T  
Snow Depth 0.00 in    
Sea Level Pressure  
Sea Level Pressure 30.22 in    
Wind  
Wind Speed 5 mph (South)    
Max Wind Speed 18 mph    
Max Gust Speed 24 mph    
Visibility 7 miles    
Events Fog    
T = Trace of Precipitation, MM = Missing Value Source: NWS Daily Summary

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Astronomy

Dec. 17, 2011 Rise Set
Actual Time 7:51 AM PST 4:19 PM PST
Civil Twilight 7:15 AM PST 4:55 PM PST
Nautical Twilight 6:36 AM PST 5:34 PM PST
Astronomical Twilight 5:58 AM PST 6:11 PM PST
Moon No Moon Rise 11:41 AM PST (12/17)
Length of Visible Light 9h 39m
Length of Day
8h 27m
Waning Gibbous, 52% of the Moon is Illuminated
Dec 17
Waning Gibbous
Dec 17
Last Quarter
Dec 24
New
Dec 31
First Quarter
Jan 8
Full

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 39.9 °F - 36.0 °F 86% 30.41 in 10.0 mi Calm Calm - N/A   Partly Cloudy
1:53 AM 37.9 °F - 35.1 °F 89% 30.39 in 10.0 mi Calm Calm - N/A   Clear
2:53 AM 37.0 °F 34.5 °F 34.0 °F 89% 30.38 in 10.0 mi SE 3.5 mph - N/A   Clear
3:53 AM 37.0 °F - 33.1 °F 86% 30.36 in 10.0 mi Calm Calm - N/A   Clear
4:53 AM 35.6 °F - 33.8 °F 93% 30.31 in 10.0 mi Calm Calm - N/A   Clear
5:53 AM 35.1 °F 31.0 °F 32.0 °F 89% 30.31 in 10.0 mi SE 4.6 mph - N/A   Clear
6:32 AM 35.6 °F 32.8 °F 33.8 °F 93% 30.28 in 10.0 mi SSE 3.5 mph - N/A   Scattered Clouds
6:53 AM 35.1 °F 32.2 °F 35.1 °F 100% 30.31 in 2.5 mi South 3.5 mph - N/A   Scattered Clouds
6:59 AM 35.6 °F - 35.6 °F 100% 30.28 in 0.5 mi Calm Calm - N/A Fog Fog
7:08 AM 35.6 °F - 35.6 °F 100% 30.28 in 0.2 mi Calm Calm - N/A Fog Fog
7:24 AM 35.6 °F - 33.8 °F 93% 30.28 in 0.5 mi Calm Calm - N/A Fog Fog
7:38 AM 35.6 °F - 33.8 °F 93% 30.27 in 0.2 mi Calm Calm - N/A Fog Fog
7:46 AM 35.6 °F - 33.8 °F 93% 30.26 in 4.0 mi Calm Calm - N/A Fog Patches of Fog
7:53 AM 35.1 °F - 34.0 °F 96% 30.29 in 4.0 mi Calm Calm - N/A Fog Patches of Fog
8:41 AM 37.4 °F 32.8 °F 35.6 °F 93% 30.25 in 5.0 mi SSE 5.8 mph - N/A Fog Patches of Fog
8:53 AM 36.0 °F - 36.0 °F 100% 30.29 in 7.0 mi Calm Calm - N/A Fog Patches of Fog
8:57 AM 35.6 °F - 35.6 °F 100% 30.25 in 0.5 mi Calm Calm - N/A Fog Patches of Fog
9:03 AM 35.6 °F - 35.6 °F 100% 30.25 in 0.5 mi Calm Calm - N/A Fog Fog
9:34 AM 37.4 °F - 37.4 °F 100% 30.25 in 0.5 mi Calm Calm - N/A Fog Patches of Fog
9:53 AM 39.0 °F 36.8 °F 37.9 °F 96% 30.27 in 7.0 mi South 3.5 mph - N/A Fog Patches of Fog
10:53 AM 41.0 °F 38.0 °F 37.9 °F 89% 30.25 in 10.0 mi South 4.6 mph - N/A   Mostly Cloudy
11:53 AM 46.9 °F - 37.9 °F 71% 30.22 in 10.0 mi South 5.8 mph - N/A   Mostly Cloudy
12:53 PM 46.9 °F - 39.0 °F 74% 30.17 in 10.0 mi South 6.9 mph - N/A   Scattered Clouds
1:53 PM 48.9 °F - 39.0 °F 69% 30.14 in 10.0 mi South 4.6 mph - N/A   Scattered Clouds
2:53 PM 48.9 °F - 37.9 °F 66% 30.12 in 10.0 mi South 4.6 mph - N/A   Scattered Clouds
3:53 PM 44.6 °F 41.4 °F 39.2 °F 81% 30.07 in 10.0 mi South 5.8 mph - N/A   Scattered Clouds
4:53 PM 44.1 °F 42.5 °F 37.9 °F 79% 30.09 in 10.0 mi South 3.5 mph - N/A   Scattered Clouds
5:53 PM 44.1 °F 40.1 °F 37.0 °F 76% 30.08 in 10.0 mi SSE 6.9 mph - N/A   Partly Cloudy
6:53 PM 45.0 °F 40.6 °F 37.0 °F 74% 30.07 in 10.0 mi SE 8.1 mph - N/A   Partly Cloudy
7:53 PM 45.0 °F 41.2 °F 37.0 °F 74% 30.08 in 10.0 mi South 6.9 mph - N/A   Partly Cloudy
8:53 PM 46.0 °F 41.9 °F 37.0 °F 71% 30.07 in 10.0 mi SSW 8.1 mph - N/A   Scattered Clouds
9:53 PM 46.0 °F 40.2 °F 39.0 °F 76% 30.07 in 10.0 mi SSW 12.7 mph - N/A   Scattered Clouds
10:53 PM 45.0 °F 38.5 °F 39.0 °F 80% 30.07 in 10.0 mi SSW 13.8 mph - N/A   Overcast
11:53 PM 45.0 °F 38.2 °F 37.9 °F 76% 30.09 in 10.0 mi SSW 15.0 mph - N/A   Mostly Cloudy