Weather History for Seattle, WA

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Saturday, December 31, 2011

  Actual Average Record
Temperature  
Mean Temperature 38 °F 41 °F  
Max Temperature 43 °F 46 °F 56 °F (1963)
Min Temperature 32 °F 36 °F 13 °F (1968)
Degree Days  
Heating Degree Days 27 24  
Month to date heating degree days 791 757  
Since 1 July heating degree days 1983 1938  
Cooling Degree Days 0 0  
Month to date cooling degree days 0 0  
Year to date cooling degree days 148 189  
Moisture  
Dew Point 29 °F    
Average Humidity 70    
Maximum Humidity 89    
Minimum Humidity 51    
Precipitation  
Precipitation 0.00 in 0.16 in 1.30 in (1996)
Month to date precipitation 2.24 5.35  
Year to date precipitation 36.40 37.49  
Snow  
Snow 0.00 in - 9.30 in (1968)
Month to date snowfall 0.0  
Since 1 July snowfall T  
Snow Depth 0.00 in    
Sea Level Pressure  
Sea Level Pressure 30.35 in    
Wind  
Wind Speed 6 mph (ESE)    
Max Wind Speed 15 mph    
Max Gust Speed 20 mph    
Visibility 10 miles    
Events      
T = Trace of Precipitation, MM = Missing Value Source: NWS Daily Summary

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Date:

Astronomy

Dec. 31, 2011 Rise Set
Actual Time 7:56 AM PST 4:27 PM PST
Civil Twilight 7:21 AM PST 5:03 PM PST
Nautical Twilight 6:42 AM PST 5:42 PM PST
Astronomical Twilight 6:04 AM PST 6:19 PM PST
Moon 11:12 AM PST (12/31) No Moon Set
Length of Visible Light 9h 42m
Length of Day
8h 31m
Waxing Crescent, 46% of the Moon is Illuminated
Dec 31
Waxing Crescent
Dec 31
First Quarter
Jan 8
Full
Jan 16
Last Quarter
Jan 22
New

Hourly Weather History & Observations

Time (PST) Temp. Windchill Dew Point Humidity Pressure Visibility Wind Dir Wind Speed Gust Speed Precip Events Conditions
12:39 AM 39.2 °F 33.6 °F 33.8 °F 81% 30.24 in 10.0 mi SSW 8.1 mph - N/A   Mostly Cloudy
12:53 AM 39.0 °F 32.3 °F 33.1 °F 79% 30.28 in 10.0 mi SSW 10.4 mph - N/A   Mostly Cloudy
1:53 AM 37.9 °F 31.5 °F 32.0 °F 79% 30.33 in 10.0 mi SW 9.2 mph - N/A   Mostly Cloudy
2:53 AM 36.0 °F 27.1 °F 30.9 °F 82% 30.36 in 10.0 mi SSW 13.8 mph - N/A   Mostly Cloudy
3:53 AM 35.6 °F 29.9 °F 30.2 °F 81% 30.35 in 10.0 mi SSW 6.9 mph - N/A   Mostly Cloudy
4:29 AM 35.6 °F 32.8 °F 30.2 °F 81% 30.35 in 10.0 mi South 3.5 mph - N/A   Scattered Clouds
4:53 AM 34.0 °F 28.0 °F 30.0 °F 85% 30.38 in 10.0 mi SE 6.9 mph - N/A   Partly Cloudy
5:27 AM 33.8 °F 28.6 °F 30.2 °F 87% 30.35 in 10.0 mi ESE 5.8 mph - N/A   Mostly Cloudy
5:53 AM 34.0 °F 26.6 °F 30.0 °F 85% 30.38 in 10.0 mi SE 9.2 mph - N/A   Mostly Cloudy
6:53 AM 32.0 °F 27.5 °F 28.9 °F 88% 30.39 in 10.0 mi SSE 4.6 mph - N/A   Scattered Clouds
7:53 AM 34.0 °F 31.0 °F 30.0 °F 85% 30.39 in 10.0 mi SE 3.5 mph - N/A   Scattered Clouds
8:53 AM 34.0 °F - 30.0 °F 85% 30.43 in 10.0 mi Calm Calm - N/A   Overcast
9:53 AM 37.9 °F - 30.9 °F 76% 30.43 in 10.0 mi Calm Calm - N/A   Mostly Cloudy
10:53 AM 37.9 °F 34.4 °F 28.9 °F 70% 30.44 in 10.0 mi ESE 4.6 mph - N/A   Scattered Clouds
11:53 AM 39.9 °F - 28.9 °F 65% 30.43 in 10.0 mi Calm Calm - N/A   Scattered Clouds
12:53 PM 41.0 °F 38.0 °F 28.0 °F 60% 30.42 in 10.0 mi ESE 4.6 mph - N/A   Mostly Cloudy
1:53 PM 42.1 °F 38.4 °F 28.0 °F 58% 30.40 in 10.0 mi East 5.8 mph - N/A   Mostly Cloudy
2:53 PM 43.0 °F 38.8 °F 26.1 °F 51% 30.38 in 10.0 mi ENE 6.9 mph - N/A   Mostly Cloudy
3:53 PM 41.0 °F 35.8 °F 30.0 °F 65% 30.35 in 10.0 mi North 8.1 mph - N/A   Mostly Cloudy
4:53 PM 39.9 °F 33.9 °F 28.9 °F 65% 30.34 in 10.0 mi NNE 9.2 mph - N/A   Mostly Cloudy
5:53 PM 37.9 °F 31.5 °F 30.0 °F 73% 30.32 in 10.0 mi North 9.2 mph - N/A   Mostly Cloudy
6:53 PM 37.9 °F 31.5 °F 30.9 °F 76% 30.30 in 10.0 mi NNE 9.2 mph - N/A   Mostly Cloudy
7:53 PM 39.9 °F 37.8 °F 25.0 °F 55% 30.31 in 10.0 mi ENE 3.5 mph - N/A   Overcast
8:53 PM 41.0 °F 36.4 °F 24.8 °F 53% 30.26 in 10.0 mi ESE 6.9 mph - N/A   Overcast
9:53 PM 39.9 °F 37.8 °F 25.0 °F 55% 30.30 in 10.0 mi North 3.5 mph - N/A   Overcast
10:53 PM 41.0 °F 38.0 °F 26.1 °F 55% 30.31 in 10.0 mi NE 4.6 mph - N/A   Overcast
11:53 PM 42.8 °F 36.6 °F 24.8 °F 49% 30.28 in 10.0 mi East 11.5 mph 19.6 mph N/A   Overcast