Weather History for Allentown, PA

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Wednesday, December 21, 2011

  Actual Average Record
Temperature  
Mean Temperature 47 °F 31 °F  
Max Temperature 55 °F 39 °F 57 °F (1957)
Min Temperature 38 °F 23 °F -3 °F (1942)
Degree Days  
Heating Degree Days 18 34  
Month to date heating degree days 540 658  
Since 1 July heating degree days 1477 1838  
Cooling Degree Days 0 0  
Month to date cooling degree days 0 0  
Year to date cooling degree days 1075 757  
Moisture  
Dew Point 42 °F    
Average Humidity 96    
Maximum Humidity 100    
Minimum Humidity 92    
Precipitation  
Precipitation 0.31 in 0.10 in 1.44 in (2012)
Month to date precipitation 2.56 2.57  
Year to date precipitation 70.10 44.34  
Snow  
Snow 0.00 in 0.10 in 4.10 in (1959)
Month to date snowfall T 3.0  
Since 1 July snowfall 6.8 3.7  
Snow Depth 0.00 in    
Sea Level Pressure  
Sea Level Pressure 29.94 in    
Wind  
Wind Speed 3 mph (NNE)    
Max Wind Speed 20 mph    
Max Gust Speed 26 mph    
Visibility 4 miles    
Events Fog , Rain    
T = Trace of Precipitation, MM = Missing Value Source: NWS Daily Summary

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Date:

Astronomy

Dec. 21, 2011 Rise Set
Actual Time 7:21 AM EST 4:37 PM EST
Civil Twilight 6:51 AM EST 5:08 PM EST
Nautical Twilight 6:16 AM EST 5:43 PM EST
Astronomical Twilight 5:43 AM EST 6:16 PM EST
Moon 3:51 AM EST (12/21) 1:55 PM EST (12/21)
Length of Visible Light 10h 17m
Length of Day
9h 15m
Waning Crescent, 12% of the Moon is Illuminated
Dec 21
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 37.9 °F 35.5 °F 37.0 °F 97% 30.14 in 7.0 mi NE 3.5 mph - N/A   Overcast
1:05 AM 37.4 °F - 37.4 °F 100% 30.12 in 7.0 mi Calm Calm - N/A   Overcast
1:16 AM 39.2 °F 37.0 °F 37.4 °F 93% 30.12 in 7.0 mi NE 3.5 mph - N/A   Overcast
1:25 AM 39.2 °F 37.0 °F 37.4 °F 93% 30.12 in 7.0 mi NE 3.5 mph - N/A   Overcast
1:37 AM 39.2 °F 37.0 °F 37.4 °F 93% 30.12 in 7.0 mi NE 3.5 mph - N/A   Overcast
1:59 AM 39.2 °F - 37.4 °F 93% 30.12 in 6.0 mi Calm Calm - N/A   Overcast
2:11 AM 39.2 °F 37.0 °F 37.4 °F 93% 30.12 in 6.0 mi NE 3.5 mph - N/A   Overcast
2:51 AM 39.0 °F 36.8 °F 37.0 °F 93% 30.12 in 6.0 mi ENE 3.5 mph - N/A   Overcast
3:22 AM 39.2 °F 35.9 °F 37.4 °F 93% 30.08 in 6.0 mi NE 4.6 mph - N/A   Overcast
3:51 AM 39.0 °F 35.7 °F 37.0 °F 93% 30.07 in 6.0 mi NE 4.6 mph - N/A   Overcast
4:10 AM 39.2 °F 37.0 °F 37.4 °F 93% 30.06 in 6.0 mi North 3.5 mph - N/A   Overcast
4:51 AM 39.9 °F 36.7 °F 37.9 °F 93% 30.06 in 6.0 mi NE 4.6 mph - 0.00 in Rain Light Rain
5:51 AM 41.0 °F 36.4 °F 37.9 °F 89% 30.04 in 6.0 mi ESE 6.9 mph - 0.00 in   Overcast
6:11 AM 41.0 °F 37.1 °F 37.4 °F 87% 30.03 in 6.0 mi ESE 5.8 mph - N/A   Overcast
6:51 AM 41.0 °F - 37.9 °F 89% 30.03 in 6.0 mi Calm Calm - 0.00 in Rain Light Rain
7:51 AM 41.0 °F - 39.9 °F 96% 30.02 in 5.0 mi Calm Calm - 0.00 in Rain Light Rain
8:07 AM 42.8 °F - 39.2 °F 87% 30.01 in 2.5 mi Calm Calm - 0.01 in Rain Rain
8:21 AM 42.8 °F - 41.0 °F 93% 30.02 in 3.0 mi Calm Calm - 0.02 in Rain Light Rain
8:38 AM 42.8 °F - 39.2 °F 87% 30.00 in 4.0 mi Calm Calm - 0.03 in Rain Light Rain
8:51 AM 43.0 °F - 41.0 °F 93% 30.01 in 3.0 mi Calm Calm - 0.03 in Rain Light Rain
9:03 AM 42.8 °F 41.1 °F 41.0 °F 93% 30.00 in 2.0 mi North 3.5 mph - 0.02 in Rain Rain
9:10 AM 42.8 °F 41.1 °F 39.2 °F 87% 30.00 in 1.5 mi North 3.5 mph - 0.04 in Rain Rain
9:28 AM 42.8 °F - 41.0 °F 93% 30.00 in 2.5 mi Calm Calm - 0.05 in Rain Light Rain
9:59 AM 42.8 °F - 41.0 °F 93% 29.98 in 1.8 mi Calm Calm - 0.00 in Rain Light Rain
10:31 AM 44.6 °F 42.2 °F 42.8 °F 93% 29.95 in 0.5 mi East 4.6 mph - 0.01 in Rain Light Rain
10:51 AM 44.1 °F 41.5 °F 43.0 °F 96% 29.95 in 0.5 mi East 4.6 mph - 0.01 in   Overcast
11:20 AM 44.6 °F 43.1 °F 44.6 °F 100% 29.92 in 0.5 mi ESE 3.5 mph - 0.00 in Fog , Rain Light Rain
11:51 AM 45.0 °F - 45.0 °F 100% 29.91 in 0.5 mi Calm Calm - 0.00 in Fog Fog
12:31 PM 44.6 °F 43.1 °F 44.6 °F 100% 29.87 in 0.2 mi NW 3.5 mph - N/A Fog Fog
12:40 PM 44.6 °F - 44.6 °F 100% 29.87 in 0.5 mi Calm Calm - N/A Fog Fog
12:51 PM 45.0 °F 43.5 °F 44.1 °F 97% 29.88 in 0.5 mi NW 3.5 mph - N/A Fog Fog
1:07 PM 44.6 °F 43.1 °F 44.6 °F 100% 29.86 in 0.2 mi NNW 3.5 mph - N/A Fog Fog
1:15 PM 44.6 °F 43.1 °F 44.6 °F 100% 29.86 in 0.5 mi NNW 3.5 mph - N/A Fog Fog
1:51 PM 46.0 °F - 45.0 °F 96% 29.84 in 0.5 mi Calm Calm - 0.00 in Fog , Rain Light Rain
2:51 PM 46.0 °F - 45.0 °F 96% 29.83 in 0.5 mi Calm Calm - 0.02 in Fog , Rain Light Rain
3:51 PM 46.9 °F - 46.0 °F 97% 29.81 in 0.8 mi Calm Calm - 0.00 in   Overcast
4:51 PM 46.9 °F - 45.0 °F 93% 29.78 in 2.5 mi Calm Calm - N/A   Overcast
5:27 PM 46.4 °F - 46.4 °F 100% 29.74 in 1.5 mi Calm Calm - N/A   Overcast
5:51 PM 46.9 °F - 46.0 °F 97% 29.75 in 1.5 mi NW 3.5 mph - N/A   Overcast
5:55 PM 46.4 °F 44.3 °F 46.4 °F 100% 29.75 in 3.0 mi NW 4.6 mph - N/A   Overcast
6:58 PM 46.4 °F 44.3 °F 46.4 °F 100% 29.73 in 4.0 mi NNW 4.6 mph - N/A   Overcast
7:51 PM 46.9 °F - 46.0 °F 97% 29.73 in 4.0 mi Calm Calm - N/A   Overcast
8:51 PM 48.0 °F - 46.9 °F 96% 29.72 in 4.0 mi Calm Calm - N/A   Overcast
9:20 PM 51.8 °F - 50.0 °F 94% 29.75 in 2.5 mi WSW 10.4 mph 25.3 mph 0.14 in Rain Rain
9:23 PM 51.8 °F - 50.0 °F 94% 29.75 in 3.0 mi WSW 11.5 mph 25.3 mph 0.15 in Rain Rain
9:51 PM 54.0 °F - 51.1 °F 90% 29.76 in 10.0 mi WSW 11.5 mph - 0.18 in Rain Light Rain
10:51 PM 54.0 °F - 46.9 °F 77% 29.81 in 10.0 mi WSW 16.1 mph 21.9 mph 0.01 in   Partly Cloudy
11:51 PM 52.0 °F - 45.0 °F 77% 29.84 in 10.0 mi WSW 10.4 mph - N/A   Clear