Weather History for Portland, ME

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Monday, December 31, 2012

  Actual Average Record
Temperature  
Mean Temperature 23 °F 24 °F  
Max Temperature 35 °F 33 °F 53 °F (1990)
Min Temperature 11 °F 15 °F -21 °F (1963)
Degree Days  
Heating Degree Days 42 41  
Month to date heating degree days 1013 1120  
Since 1 July heating degree days 2350 2612  
Cooling Degree Days 0 0  
Month to date cooling degree days 0 0  
Year to date cooling degree days 492 359  
Moisture  
Dew Point 13 °F    
Average Humidity 63    
Maximum Humidity 75    
Minimum Humidity 51    
Precipitation  
Precipitation 0.00 in 0.11 in 1.49 in (1972)
Month to date precipitation 8.30 4.02  
Year to date precipitation 54.47 47.25  
Snow  
Snow 0.00 in 0.60 in 7.70 in (2007)
Month to date snowfall 24.8 13.2  
Since 1 July snowfall 27.7 15.1  
Snow Depth 11.00 in    
Sea Level Pressure  
Sea Level Pressure 29.84 in    
Wind  
Wind Speed 6 mph (WSW)    
Max Wind Speed 14 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, 2012 Rise Set
Actual Time 7:14 AM EST 4:14 PM EST
Civil Twilight 6:42 AM EST 4:47 PM EST
Nautical Twilight 6:05 AM EST 5:23 PM EST
Astronomical Twilight 5:31 AM EST 5:58 PM EST
Moon 7:48 PM EST (12/31) 8:48 AM EST (12/31)
Length of Visible Light 10h 05m
Length of Day
8h 59m
Waning Gibbous, 90% of the Moon is Illuminated
Dec 31
Waning Gibbous
Jan 4
Last Quarter
Jan 11
New
Jan 18
First Quarter
Jan 26
Full

Hourly Weather History & Observations

Time (EST) Temp. Windchill Dew Point Humidity Pressure Visibility Wind Dir Wind Speed Gust Speed Precip Events Conditions
12:51 AM 15.1 °F 2.5 °F 3.0 °F 59% 29.86 in 10.0 mi WNW 10.4 mph - N/A   Clear
1:51 AM 17.1 °F 8.7 °F 3.0 °F 54% 29.87 in 10.0 mi NNW 5.8 mph - N/A   Clear
2:51 AM 18.0 °F 8.7 °F 3.0 °F 52% 29.88 in 10.0 mi West 6.9 mph - N/A   Clear
3:51 AM 19.0 °F 7.5 °F 5.0 °F 54% 29.87 in 10.0 mi West 10.4 mph - N/A   Clear
4:51 AM 19.9 °F 11.1 °F 6.1 °F 55% 29.88 in 10.0 mi NW 6.9 mph - N/A   Clear
5:51 AM 18.0 °F 7.7 °F 6.1 °F 60% 29.88 in 10.0 mi NW 8.1 mph - N/A   Clear
6:51 AM 19.0 °F - 6.1 °F 57% 29.91 in 10.0 mi Calm Calm - N/A   Clear
7:51 AM 16.0 °F - 6.1 °F 65% 29.91 in 10.0 mi Calm Calm - N/A   Clear
8:51 AM 21.9 °F 11.0 °F 10.0 °F 60% 29.92 in 10.0 mi SSW 10.4 mph - N/A   Clear
9:51 AM 25.0 °F 17.1 °F 12.9 °F 60% 29.93 in 10.0 mi SSW 6.9 mph - N/A   Clear
10:51 AM 28.0 °F 22.8 °F 15.1 °F 58% 29.90 in 10.0 mi South 4.6 mph - N/A   Clear
11:51 AM 30.9 °F - 16.0 °F 54% 29.87 in 10.0 mi Calm Calm - N/A   Clear
12:51 PM 32.0 °F 25.6 °F 17.1 °F 54% 29.85 in 10.0 mi NE 6.9 mph - N/A   Scattered Clouds
1:51 PM 32.0 °F 27.5 °F 18.0 °F 56% 29.83 in 10.0 mi ESE 4.6 mph - N/A   Scattered Clouds
2:51 PM 33.1 °F 30.0 °F 19.0 °F 56% 29.83 in 10.0 mi South 3.5 mph - N/A   Partly Cloudy
3:51 PM 33.1 °F - 19.0 °F 56% 29.83 in 10.0 mi North - - N/A   Clear
4:51 PM 30.9 °F 25.2 °F 19.9 °F 64% 29.83 in 10.0 mi WSW 5.8 mph - N/A   Clear
5:51 PM 30.2 °F 23.4 °F 19.4 °F 64% 29.81 in 10.0 mi SW 6.9 mph - N/A   Clear
6:51 PM 28.9 °F 23.9 °F 19.9 °F 69% 29.80 in 10.0 mi SW 4.6 mph - N/A   Clear
7:51 PM 28.9 °F 22.8 °F 21.0 °F 72% 29.79 in 10.0 mi SW 5.8 mph - N/A   Clear
8:51 PM 28.9 °F 20.4 °F 21.0 °F 72% 29.77 in 10.0 mi WSW 9.2 mph - N/A   Clear
9:51 PM 28.9 °F 23.9 °F 21.9 °F 75% 29.75 in 10.0 mi SW 4.6 mph - N/A   Clear
10:51 PM 28.9 °F 23.9 °F 21.9 °F 75% 29.73 in 10.0 mi SSW 4.6 mph - N/A   Clear
11:51 PM 30.0 °F 21.1 °F 21.9 °F 72% 29.70 in 10.0 mi WSW 10.4 mph - N/A   Overcast