Weather History for KSEA - December, 2011

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Sunday, December 18, 2011

  Actual Average Record
Temperature  
Mean Temperature 41 °F 40 °F  
Max Temperature 46 °F 45 °F 54 °F (1958)
Min Temperature 35 °F 35 °F 18 °F (1964)
Degree Days  
Heating Degree Days 24 25  
Month to date heating degree days 500 435  
Since 1 July heating degree days 1692 1618  
Cooling Degree Days 0 0  
Month to date cooling degree days 0 0  
Year to date cooling degree days 148 189  
Moisture  
Dew Point 41 °F    
Average Humidity 88    
Maximum Humidity 100    
Minimum Humidity 76    
Precipitation  
Precipitation 0.19 in 0.16 in 1.23 in (1960)
Month to date precipitation 0.25 3.19  
Year to date precipitation 34.41 35.33  
Snow  
Snow 0.00 in - 5.10 in (1968)
Month to date snowfall 0.0  
Since 1 July snowfall T  
Snow Depth 0.00 in    
Sea Level Pressure  
Sea Level Pressure 30.25 in    
Wind  
Wind Speed 4 mph (WNW)    
Max Wind Speed 14 mph    
Max Gust Speed 16 mph    
Visibility 6 miles    
Events Rain    
T = Trace of Precipitation, MM = Missing Value Source: NWS Daily Summary

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Astronomy

Dec. 18, 2011 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 5:59 AM PST 6:12 PM PST
Moon 12:38 AM PST (12/18) 12:06 PM PST (12/18)
Length of Visible Light 9h 39m
Length of Day
8h 27m
Last Quarter, 41% of the Moon is Illuminated
Dec 18
Last Quarter
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
12:12 AM 44.6 °F 39.7 °F 37.4 °F 76% 30.08 in 10.0 mi SW 9.2 mph - 0.00 in Rain Light Rain
12:53 AM 44.1 °F 41.5 °F 39.0 °F 82% 30.10 in 3.0 mi West 4.6 mph - 0.03 in Rain Light Rain
1:10 AM 44.6 °F 41.4 °F 41.0 °F 87% 30.09 in 8.0 mi WSW 5.8 mph - N/A Rain Light Rain
1:53 AM 43.0 °F 37.7 °F 41.0 °F 93% 30.12 in 9.0 mi SSW 9.2 mph - 0.05 in Rain Light Rain
2:22 AM 44.6 °F 40.7 °F 41.0 °F 87% 30.10 in 10.0 mi SSW 6.9 mph - 0.00 in   Mostly Cloudy
2:53 AM 43.0 °F 38.2 °F 41.0 °F 93% 30.12 in 10.0 mi South 8.1 mph - 0.00 in   Overcast
3:53 AM 44.6 °F 40.7 °F 42.8 °F 93% 30.10 in 10.0 mi SSW 6.9 mph - N/A   Overcast
4:49 AM 44.6 °F 39.7 °F 42.8 °F 93% 30.11 in 2.5 mi SW 9.2 mph - 0.00 in   Light Drizzle
4:53 AM 44.1 °F 39.0 °F 42.1 °F 93% 30.14 in 2.5 mi SW 9.2 mph - 0.00 in   Light Drizzle
5:34 AM 44.6 °F 41.4 °F 42.8 °F 93% 30.12 in 1.8 mi SW 5.8 mph - 0.00 in Rain Light Rain
5:44 AM 44.6 °F 40.7 °F 42.8 °F 93% 30.13 in 2.0 mi SW 6.9 mph - N/A   Light Drizzle
5:53 AM 44.1 °F 40.8 °F 42.1 °F 93% 30.16 in 2.5 mi SW 5.8 mph - 0.00 in   Light Drizzle
6:41 AM 42.8 °F 41.1 °F 42.8 °F 100% 30.14 in 0.5 mi WSW 3.5 mph - 0.00 in Rain Light Rain
6:51 AM 42.8 °F 40.1 °F 42.8 °F 100% 30.15 in 0.5 mi WSW 4.6 mph - 0.01 in Rain Light Rain
6:53 AM 43.0 °F 41.3 °F 42.1 °F 97% 30.18 in 0.5 mi WSW 3.5 mph - 0.01 in Rain Light Rain
7:04 AM 42.8 °F 40.1 °F 42.8 °F 100% 30.15 in 0.5 mi SW 4.6 mph - 0.00 in   Overcast
7:53 AM 43.0 °F 41.3 °F 42.1 °F 97% 30.20 in 0.5 mi WSW 3.5 mph - 0.02 in Rain Light Rain
8:53 AM 43.0 °F - 43.0 °F 100% 30.23 in 0.5 mi Calm Calm - 0.03 in Rain Light Rain
9:09 AM 42.8 °F - 42.8 °F 100% 30.21 in 1.2 mi Calm Calm - 0.02 in Rain Light Rain
9:31 AM 44.6 °F - 42.8 °F 93% 30.22 in 1.2 mi Calm Calm - N/A   Overcast
9:53 AM 44.6 °F - 42.8 °F 93% 30.23 in 1.2 mi Calm Calm - N/A Rain Light Rain
10:53 AM 44.6 °F - 42.8 °F 93% 30.25 in 1.2 mi Calm Calm - N/A Rain Light Rain
11:53 AM 45.0 °F - 43.0 °F 93% 30.29 in 2.0 mi Calm Calm - 0.01 in   Overcast
12:31 PM 44.6 °F - 42.8 °F 93% 30.26 in 3.0 mi Calm Calm - N/A   Overcast
12:41 PM 46.4 °F - 42.8 °F 87% 30.26 in 3.0 mi Calm Calm - N/A   Overcast
12:53 PM 46.0 °F 44.8 °F 43.0 °F 89% 30.30 in 3.0 mi NNW 3.5 mph - N/A   Overcast
1:53 PM 46.0 °F 43.1 °F 43.0 °F 89% 30.32 in 9.0 mi North 5.8 mph - N/A   Overcast
2:17 PM 46.4 °F 44.3 °F 42.8 °F 87% 30.31 in 9.0 mi North 4.6 mph - N/A   Overcast
2:53 PM 45.0 °F 41.2 °F 42.1 °F 90% 30.36 in 10.0 mi North 6.9 mph - N/A   Overcast
3:25 PM 46.4 °F 41.9 °F 41.0 °F 81% 30.33 in 10.0 mi NNE 9.2 mph - N/A   Overcast
3:49 PM 44.6 °F 42.2 °F 41.0 °F 87% 30.33 in 10.0 mi ENE 4.6 mph - N/A   Scattered Clouds
3:53 PM 45.0 °F 42.6 °F 41.0 °F 86% 30.35 in 10.0 mi ENE 4.6 mph - N/A   Scattered Clouds
4:53 PM 43.0 °F 41.3 °F 39.9 °F 89% 30.37 in 10.0 mi NNE 3.5 mph - N/A   Scattered Clouds
5:53 PM 39.9 °F - 37.9 °F 93% 30.39 in 10.0 mi Calm Calm - N/A   Partly Cloudy
6:19 PM 39.2 °F 37.0 °F 39.2 °F 100% 30.36 in 10.0 mi North 3.5 mph - N/A   Mostly Cloudy
6:36 PM 39.2 °F 37.0 °F 39.2 °F 100% 30.37 in 10.0 mi NNE 3.5 mph - N/A   Scattered Clouds
6:53 PM 39.9 °F 37.8 °F 37.9 °F 93% 30.41 in 10.0 mi North 3.5 mph - N/A   Partly Cloudy
7:53 PM 39.0 °F 34.8 °F 37.9 °F 96% 30.43 in 10.0 mi North 5.8 mph - N/A   Scattered Clouds
8:53 PM 42.1 °F 39.2 °F 39.0 °F 89% 30.44 in 10.0 mi NNE 4.6 mph - N/A   Mostly Cloudy
9:53 PM 39.9 °F 35.1 °F 37.9 °F 93% 30.45 in 8.0 mi NNE 6.9 mph - N/A   Mostly Cloudy
10:53 PM 39.9 °F 35.8 °F 37.9 °F 93% 30.46 in 9.0 mi NNE 5.8 mph - N/A   Mostly Cloudy
11:53 PM 39.9 °F - 37.0 °F 89% 30.46 in 10.0 mi Calm Calm - N/A   Scattered Clouds