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 transition into December is accompanied by a temperature decrease, with the average high-temperature shifting from a cool 50°F (10°C) in November to a cold 40.1°F (4.5°C). William Penn Manor's temperature tends to fall to an average low of 28.8°F (-1.8°C) during the nights of December.Humidity
In December, the average relative humidity in William Penn Manor is 80%.Rainfall
In December, in William Penn Manor, the rain falls for 10.7 days. Throughout December, 2.24" (57mm) of precipitation is accumulated. In William Penn Manor, during the entire year, the rain falls for 153 days and collects up to 26.81" (681mm) of precipitation.Snowfall
January through May, October through December are months with snowfall. In William Penn Manor, in December, snow falls for 4.8 days, with typically accumulated 2.48" (63mm) of snow. In William Penn Manor, Pennsylvania, during the entire year, snow falls for 26.7 days and aggregates up to 14.49" (368mm) of snow.Daylight
With an average of 9h and 18min of daylight, December has the shortest days of the year in William Penn Manor.On the first day of December in William Penn Manor, sunrise is at 7:06 am and sunset at 4:34 pm. On the last day of the month, sunrise is at 7:25 am and sunset at 4:44 pm EST.
Sunshine
The average sunshine in December in William Penn Manor is 4.7h.UV index
The months with the lowest UV index in William Penn Manor, Pennsylvania, are January through March, November and December, with an average maximum UV index of 2. A UV Index value of 2, and less, symbolizes a minimal health hazard from unsafe exposure to UV radiation for the ordinary person.Note: In December, a regular UV index of 2 translates into these guidelines:
Children, babies, and those with sensitive skin should always be shielded from long periods of sun exposure. When the Sun is at its strongest around midday, find shade and limit exposure. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage. Watch out! The Sun's UV radiation can be nearly magnified twofold due to snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Is December cold in William Penn Manor?
What is the average humidity in December in William Penn Manor?
How much does it rain in William Penn Manor in December?
How much does it snow in William Penn Manor in December?
What is the month with the shortest days in William Penn Manor?
How many hours of daylight does William Penn Manor have in December?
What time are sunrise and sunset in December in William Penn Manor?
How many hours of sunshine does William Penn Manor have in December?
What is the month with the lowest UV index in William Penn Manor?
What is the UV index reading in December in William Penn Manor?
Average temperature in December
William Penn Manor, PA
- Average high temperature in December: 40.1°F
The warmest month (with the highest average high temperature) is July (83.5°F).
The month with the lowest average high temperature is January (34°F).
- Average low temperature in December: 28.8°F
The month with the highest average low temperature is July (63.5°F).
The coldest month (with the lowest average low temperature) is January (21.6°F).
Average pressure in December
William Penn Manor, PA
- Average pressure in December: 30.09"Hg
The month with the highest atmospheric pressure is November (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in December
William Penn Manor, PA
- Average wind speed in December: 7.6mph
The windiest month (with the highest average wind speed) is March (8.1mph).
The calmest month (with the lowest average wind speed) is August (5mph).
Average humidity in December
William Penn Manor, PA
- Average humidity in December: 80%
The month with the highest relative humidity is February (82%).
The months with the lowest relative humidity are April and July (76%).
Average rainfall in December
William Penn Manor, PA
- Average rainfall in December: 2.24"
The wettest month (with the highest rainfall) is July (2.91").
The driest month (with the least rainfall) is September (1.57").
Average rainfall days in December
William Penn Manor, PA
- Average rainfall days in December: 10.7 days
The month with the highest number of rainy days is May (17.8 days).
The month with the least rainy days is January (7.8 days).
Average snowfall in December
William Penn Manor, PA
- Average snowfall in December: 2.48"
The month with the highest snowfall is March (4.13").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
William Penn Manor, PA
- Average snowfall days in December: 4.8 days
The months with the highest number of snowfall days are January and February (7.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
William Penn Manor, 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 18min).
- Average sunshine in December: 4h and 4min
The month with the most sunshine is July (Average sunshine: 10h and 24min).
The month with the least sunshine is February (Average sunshine: 4h and 30min).
Average sunshine days in December
William Penn Manor, PA
- Average sunshine days in December: 17.2 days
The month with the most sunshine days is November (18.9 days).
The month with the least sunshine days is May (11 days).
Average UV index in December
William Penn Manor, 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
William Penn Manor, PA
- Average cloud cover in December: 50
The month with the most cloud cover is February (Cloud cover 51).
The month with the least cloud cover is July (Cloud cover 34).
Average visibility in December
William Penn Manor, PA
- Average visibility in December: 5mi
The months with the highest visibility are April, June and November (6mi).
The months with the lowest visibility are January, February, March, May, July, August, September, October and December (5mi).
William Penn Manor, Pennsylvania, USA
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