Weather History for Allentown, PA

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Tuesday, December 20, 2011

  Actual Average Record
Temperature  
Mean Temperature 43 °F 31 °F  
Max Temperature 48 °F 39 °F 63 °F (1957)
Min Temperature 38 °F 23 °F -2 °F (1951)
Degree Days  
Heating Degree Days 22 34  
Month to date heating degree days 522 624  
Since 1 July heating degree days 1459 1804  
Cooling Degree Days 0 0  
Month to date cooling degree days 0 0  
Year to date cooling degree days 1075 757  
Moisture  
Dew Point 34 °F    
Average Humidity 79    
Maximum Humidity 100    
Minimum Humidity 58    
Precipitation  
Precipitation 0.08 in 0.11 in 2.19 in (1957)
Month to date precipitation 2.25 2.47  
Year to date precipitation 69.79 44.24  
Snow  
Snow 0.00 in 0.20 in 6.20 in (1966)
Month to date snowfall T 2.9  
Since 1 July snowfall 6.8 3.6  
Snow Depth 0.00 in    
Sea Level Pressure  
Sea Level Pressure 30.13 in    
Wind  
Wind Speed 5 mph (North)    
Max Wind Speed 13 mph    
Max Gust Speed 17 mph    
Visibility 10 miles    
Events Rain    
T = Trace of Precipitation, MM = Missing Value Source: NWS Daily Summary

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Date:

Astronomy

Dec. 20, 2011 Rise Set
Actual Time 7:21 AM EST 4:37 PM EST
Civil Twilight 6:50 AM EST 5:08 PM EST
Nautical Twilight 6:16 AM EST 5:42 PM EST
Astronomical Twilight 5:42 AM EST 6:15 PM EST
Moon 2:39 AM EST (12/20) 1:12 PM EST (12/20)
Length of Visible Light 10h 17m
Length of Day
9h 15m
Waning Crescent, 21% of the Moon is Illuminated
Dec 20
Waning Crescent
Dec 24
New
Jan 1
First Quarter
Jan 9
Full
Jan 16
Last Quarter

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 44.1 °F 39.0 °F 30.9 °F 60% 30.01 in 10.0 mi WSW 9.2 mph - N/A   Overcast
1:51 AM 44.1 °F 40.8 °F 32.0 °F 63% 30.02 in 10.0 mi WSW 5.8 mph - N/A   Overcast
2:51 AM 43.0 °F 38.8 °F 33.1 °F 68% 30.04 in 10.0 mi SW 6.9 mph - N/A   Overcast
3:51 AM 46.9 °F - 36.0 °F 66% 30.04 in 10.0 mi West 6.9 mph - N/A   Overcast
4:51 AM 48.0 °F - 36.0 °F 63% 30.05 in 10.0 mi West 6.9 mph - N/A   Overcast
5:51 AM 46.9 °F - 37.0 °F 68% 30.07 in 10.0 mi NW 5.8 mph - N/A   Overcast
6:07 AM 44.6 °F 40.2 °F 35.6 °F 71% 30.07 in 10.0 mi North 8.1 mph - N/A   Overcast
6:51 AM 43.0 °F 37.7 °F 34.0 °F 71% 30.12 in 10.0 mi North 9.2 mph - N/A   Overcast
7:51 AM 42.1 °F 36.6 °F 33.1 °F 70% 30.15 in 10.0 mi North 9.2 mph - N/A   Overcast
8:18 AM 42.8 °F 36.6 °F 33.8 °F 70% 30.16 in 10.0 mi NNW 11.5 mph - N/A   Overcast
8:51 AM 42.1 °F 36.1 °F 32.0 °F 67% 30.18 in 10.0 mi North 10.4 mph - N/A   Overcast
9:51 AM 43.0 °F 41.3 °F 30.9 °F 62% 30.20 in 10.0 mi NNW 3.5 mph - N/A   Overcast
10:51 AM 42.1 °F 40.2 °F 30.9 °F 65% 30.18 in 10.0 mi NNE 3.5 mph - N/A   Overcast
11:51 AM 43.0 °F - 30.9 °F 62% 30.17 in 10.0 mi Calm Calm - N/A   Overcast
12:51 PM 43.0 °F - 30.0 °F 60% 30.16 in 10.0 mi Calm Calm - N/A   Partly Cloudy
1:51 PM 43.0 °F - 30.9 °F 62% 30.16 in 10.0 mi Calm Calm - N/A   Mostly Cloudy
2:51 PM 42.1 °F - 30.9 °F 65% 30.16 in 10.0 mi Calm Calm - 0.00 in Rain Light Rain
3:51 PM 39.9 °F - 34.0 °F 79% 30.16 in 10.0 mi Calm Calm - 0.00 in Rain Light Rain
4:51 PM 37.9 °F 35.5 °F 35.1 °F 89% 30.17 in 10.0 mi North 3.5 mph - 0.02 in Rain Light Rain
5:51 PM 37.9 °F - 35.1 °F 89% 30.17 in 10.0 mi Calm Calm - 0.03 in Rain Light Rain
6:58 PM 39.2 °F 37.0 °F 35.6 °F 87% 30.18 in 10.0 mi South 3.5 mph - 0.00 in   Overcast
7:51 PM 39.0 °F - 36.0 °F 89% 30.19 in 10.0 mi Calm Calm - 0.01 in Rain Light Rain
8:51 PM 37.9 °F 33.5 °F 36.0 °F 93% 30.17 in 10.0 mi ENE 5.8 mph - 0.00 in   Overcast
9:51 PM 37.9 °F 34.4 °F 37.0 °F 97% 30.18 in 9.0 mi NE 4.6 mph - N/A   Overcast
10:58 PM 37.4 °F 32.8 °F 35.6 °F 93% 30.16 in 8.0 mi NE 5.8 mph - N/A   Overcast
11:13 PM 39.2 °F 35.0 °F 37.4 °F 93% 30.14 in 8.0 mi East 5.8 mph - N/A   Overcast
11:26 PM 39.2 °F 37.0 °F 37.4 °F 93% 30.14 in 9.0 mi East 3.5 mph - N/A   Overcast
11:51 PM 37.9 °F 33.5 °F 37.0 °F 97% 30.14 in 7.0 mi ENE 5.8 mph - N/A   Overcast