Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall in December
- Average snowfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
The decrease of average high-temperatures is mild in December, with a decline from a cool 50.2°F (10.1°C) in November to an icy 41.2°F (5.1°C). Lower Allen reports an average low-temperature of 29.8°F (-1.2°C) during the nights of December.Humidity
The average relative humidity in December is 79%.Rainfall
In Lower Allen, in December, during 10.5 rainfall days, 1.38" (35mm) of precipitation is typically accumulated. Throughout the year, in Lower Allen, there are 146 rainfall days, and 19.53" (496mm) of precipitation is accumulated.Snowfall
January through April, November and December are months with snowfall in Lower Allen. In Lower Allen, in December, during 4.5 snowfall days, 1.06" (27mm) of snow is typically accumulated. Throughout the year, there are 23.2 snowfall days, and 8.39" (213mm) of snow is accumulated.Daylight
With an average of 9h and 24min of daylight, December has the shortest days of the year.On the first day of December in Lower Allen, sunrise is at 7:11 am and sunset at 4:42 pm. On the last day of the month, sunrise is at 7:29 am and sunset at 4:51 pm EST.
Sunshine
The average sunshine in December in Lower Allen is 4.7h.UV index
The months with the lowest UV index in Lower Allen are January through March, November and December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a minimal health vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The UV index of 2 during December leads to these advisories:
Children, infants, and individuals with sensitive skin should be constantly protected from extended sun exposure. Considering the strength of solar radiation at midday, one should avoid direct Sun exposure. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage. Mind you! Snow reflection can increase the intensity of the Sun's UV radiation nearly twofold.
Frequently asked questions
Is December cold in Lower Allen?
What is the average humidity in December in Lower Allen?
How much does it rain in Lower Allen in December?
How many days does it snow in December in Lower Allen?
What is the month with the shortest days in Lower Allen?
What is the average length of the day in December in Lower Allen?
What time are sunrise and sunset in December in Lower Allen?
How many hours of sunshine does Lower Allen have in December?
When is the lowest UV index in Lower Allen?
What is the UV index intensity in December in Lower Allen?
Average temperature in December
Lower Allen, PA
- Average high temperature in December: 41.2°F
The warmest month (with the highest average high temperature) is July (83.7°F).
The month with the lowest average high temperature is January (35.2°F).
- Average low temperature in December: 29.8°F
The month with the highest average low temperature is July (64°F).
The coldest month (with the lowest average low temperature) is January (22.3°F).
Average pressure in December
Lower Allen, PA
- Average pressure in December: 30.1"Hg
The month with the highest atmospheric pressure is November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).
Average wind speed in December
Lower Allen, PA
- Average wind speed in December: 7.8mph
The windiest month (with the highest average wind speed) is March (8.4mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).
Average humidity in December
Lower Allen, PA
- Average humidity in December: 79%
The months with the highest relative humidity are February and May (80%).
The month with the lowest relative humidity is April (75%).
Average rainfall in December
Lower Allen, PA
- Average rainfall in December: 1.38"
The wettest months (with the highest rainfall) are May and August (2.09").
The driest months (with the least rainfall) are January and September (1.3").
Average rainfall days in December
Lower Allen, PA
- Average rainfall days in December: 10.5 days
The month with the highest number of rainy days is May (17 days).
The month with the least rainy days is January (7.3 days).
Average snowfall in December
Lower Allen, PA
- Average snowfall in December: 1.06"
The month with the highest snowfall is January (2.4").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Lower Allen, PA
- Average snowfall days in December: 4.5 days
The month with the highest number of snowfall days is January (7.1 days).
The months with the least snowfall days are June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
Lower Allen, PA
- Average daylight in December: 9h and 2min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in December: 4h and 4min
The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is February (Average sunshine: 4h and 30min).
Average sunshine days in December
Lower Allen, PA
- Average sunshine days in December: 17.5 days
The month with the most sunshine days is November (19.6 days).
The month with the least sunshine days is May (12 days).
Average UV index in December
Lower Allen, PA
- Average UV index in December: 2
The months with the highest UV index are May, June and July (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in December
Lower Allen, PA
- Average cloud cover in December: 49
The month with the most cloud cover is February (Cloud cover 50).
The month with the least cloud cover is July (Cloud cover 31).
Average visibility in December
Lower Allen, PA
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, June, July, August, October, November and December (6mi).
The months with the lowest visibility are May and September (5mi).
Lower Allen, Pennsylvania, USA
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