Weather History for Seattle, WA

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Tuesday, December 18, 2012

  Actual Average Record
Temperature  
Mean Temperature 36 °F 40 °F  
Max Temperature 39 °F 45 °F 54 °F (1958)
Min Temperature 33 °F 35 °F 18 °F (1964)
Degree Days  
Heating Degree Days 29 25  
Month to date heating degree days 398 435  
Since 1 July heating degree days 1425 1618  
Cooling Degree Days 0 0  
Month to date cooling degree days 0 0  
Year to date cooling degree days 177 189  
Moisture  
Dew Point 30 °F    
Average Humidity 80    
Maximum Humidity 89    
Minimum Humidity 70    
Precipitation  
Precipitation 0.13 in 0.16 in 1.23 in (1960)
Month to date precipitation 4.39 3.19  
Year to date precipitation 45.80 35.33  
Snow  
Snow 0.60 in - 5.10 in (1968)
Month to date snowfall 0.6  
Since 1 July snowfall 0.6  
Snow Depth 1.00 in    
Sea Level Pressure  
Sea Level Pressure 29.95 in    
Wind  
Wind Speed 12 mph (South)    
Max Wind Speed 20 mph    
Max Gust Speed 25 mph    
Visibility 8 miles    
Events Snow    
T = Trace of Precipitation, MM = Missing Value Source: NWS Daily Summary

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Date:

Astronomy

Dec. 18, 2012 Rise Set
Actual Time 7:52 AM PST 4:19 PM PST
Civil Twilight 7:16 AM PST 4:55 PM PST
Nautical Twilight 6:37 AM PST 5:34 PM PST
Astronomical Twilight 6:00 AM PST 6:12 PM PST
Moon 11:12 AM PST (12/18) 11:16 PM PST (12/18)
Length of Visible Light 9h 39m
Length of Day
8h 27m
Waxing Crescent, 36% of the Moon is Illuminated
Dec 18
Waxing Crescent
Dec 19
First Quarter
Dec 28
Full
Jan 4
Last Quarter
Jan 11
New

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 35.1 °F 26.9 °F 30.0 °F 82% 29.92 in 10.0 mi South 11.5 mph - N/A   Mostly Cloudy
1:43 AM 35.6 °F 27.1 °F 30.2 °F 81% 29.89 in 6.0 mi South 12.7 mph 18.4 mph 0.00 in Snow Light Snow
1:53 AM 36.0 °F 28.0 °F 30.0 °F 79% 29.91 in 9.0 mi South 11.5 mph - 0.00 in   Overcast
2:37 AM 33.8 °F 25.8 °F 30.2 °F 87% 29.89 in 2.0 mi South 10.4 mph - 0.01 in Snow Light Snow
2:53 AM 33.1 °F 24.9 °F 30.9 °F 92% 29.91 in 1.8 mi South 10.4 mph - 0.03 in Snow Light Snow
3:05 AM 33.8 °F 27.0 °F 30.2 °F 87% 29.89 in 1.2 mi South 8.1 mph - 0.02 in Snow Light Snow
3:22 AM 33.8 °F 25.8 °F 30.2 °F 87% 29.88 in 1.2 mi South 10.4 mph - 0.04 in Snow Light Snow
3:29 AM 33.8 °F 25.8 °F 30.2 °F 87% 29.88 in 0.8 mi SSE 10.4 mph - 0.06 in Snow Light Snow
3:45 AM 33.8 °F 26.4 °F 30.2 °F 87% 29.88 in 1.8 mi South 9.2 mph - 0.08 in Snow Light Snow
3:53 AM 33.1 °F 23.9 °F 30.9 °F 92% 29.91 in 3.0 mi South 12.7 mph - 0.08 in Snow Light Snow
4:02 AM 33.8 °F 23.9 °F 30.2 °F 87% 29.87 in 3.0 mi South 15.0 mph - 0.01 in Snow Light Snow
4:13 AM 33.8 °F 23.9 °F 30.2 °F 87% 29.88 in 3.0 mi South 15.0 mph - 0.01 in Snow Light Snow
4:53 AM 34.0 °F 25.5 °F 30.9 °F 89% 29.91 in 9.0 mi South 11.5 mph - 0.02 in Snow Light Snow
5:53 AM 34.0 °F 24.6 °F 30.9 °F 89% 29.91 in 10.0 mi South 13.8 mph 20.7 mph 0.00 in   Mostly Cloudy
6:53 AM 34.0 °F 26.0 °F 30.9 °F 89% 29.92 in 10.0 mi SSW 10.4 mph - N/A   Overcast
7:53 AM 34.0 °F 24.2 °F 30.9 °F 89% 29.94 in 10.0 mi South 15.0 mph - N/A   Mostly Cloudy
8:53 AM 34.0 °F 25.0 °F 30.9 °F 89% 29.95 in 10.0 mi SSW 12.7 mph 23.0 mph N/A   Mostly Cloudy
9:53 AM 35.1 °F 26.9 °F 32.0 °F 89% 29.96 in 10.0 mi South 11.5 mph - N/A   Mostly Cloudy
10:53 AM 36.0 °F 27.5 °F 32.0 °F 86% 29.98 in 10.0 mi SSW 12.7 mph 20.7 mph N/A   Mostly Cloudy
11:17 AM 37.4 °F 28.9 °F 32.0 °F 81% 29.94 in 10.0 mi South 13.8 mph 19.6 mph N/A   Mostly Cloudy
11:53 AM 37.0 °F 28.1 °F 30.9 °F 79% 29.98 in 10.0 mi SSW 15.0 mph - N/A   Mostly Cloudy
12:53 PM 37.0 °F 28.1 °F 32.0 °F 82% 29.98 in 10.0 mi SSW 15.0 mph - 0.00 in   Mostly Cloudy
1:53 PM 37.9 °F 29.2 °F 32.0 °F 79% 29.97 in 10.0 mi SSW 15.0 mph 24.2 mph N/A   Mostly Cloudy
2:06 PM 37.4 °F 27.8 °F 32.0 °F 81% 29.94 in 10.0 mi SSW 17.3 mph 23.0 mph N/A   Mostly Cloudy
2:53 PM 37.9 °F 29.6 °F 30.9 °F 76% 29.99 in 10.0 mi SSW 13.8 mph 21.9 mph N/A   Mostly Cloudy
3:53 PM 37.0 °F 28.5 °F 30.0 °F 76% 29.99 in 10.0 mi SSW 13.8 mph - N/A   Mostly Cloudy
4:53 PM 37.0 °F 28.1 °F 28.9 °F 73% 30.00 in 10.0 mi SSW 15.0 mph 25.3 mph N/A   Overcast
5:53 PM 37.0 °F 28.9 °F 30.0 °F 76% 30.01 in 10.0 mi South 12.7 mph - N/A   Overcast
6:53 PM 37.0 °F 29.8 °F 30.0 °F 76% 30.01 in 10.0 mi South 10.4 mph - N/A   Overcast
7:14 PM 37.4 °F 31.4 °F 30.2 °F 75% 29.98 in 10.0 mi South 8.1 mph 17.3 mph N/A   Overcast
7:53 PM 36.0 °F 28.5 °F 30.0 °F 79% 30.01 in 10.0 mi South 10.4 mph - N/A   Overcast
8:53 PM 36.0 °F 29.0 °F 28.9 °F 76% 30.01 in 10.0 mi South 9.2 mph - N/A   Overcast
9:23 PM 35.6 °F 28.0 °F 28.4 °F 75% 29.98 in 10.0 mi South 10.4 mph - N/A   Overcast
9:53 PM 36.0 °F 29.0 °F 28.0 °F 73% 30.01 in 10.0 mi South 9.2 mph - N/A   Mostly Cloudy
10:53 PM 36.0 °F 30.3 °F 28.0 °F 73% 30.00 in 10.0 mi SE 6.9 mph - N/A   Mostly Cloudy
11:53 PM 35.1 °F 29.3 °F 27.0 °F 72% 29.99 in 10.0 mi SE 6.9 mph - N/A   Overcast