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
Stepping into December, Williamsport observes a temperature decline, with the average high falling from November's chilly 46.2°F (7.9°C) to an icy 36.7°F (2.6°C). December nights cool down to an average low-temperature of 26.6°F (-3°C).Humidity
The average relative humidity in December is 83%.Rainfall
In Williamsport, in December, during 10.6 rainfall days, 1.14" (29mm) of precipitation is typically accumulated. In Williamsport, during the entire year, the rain falls for 145.2 days and collects up to 16.57" (421mm) of precipitation.Snowfall
Months with snowfall in Williamsport are January through April, October through December. In Williamsport, in December, during 8.1 snowfall days, 1.38" (35mm) of snow is typically accumulated. In Williamsport, during the entire year, snow falls for 39.1 days and aggregates up to 7.56" (192mm) of snow.Daylight
With an average of 9h and 18min of daylight, December has the shortest days of the year in Williamsport.On the first day of the month, sunrise is at 7:14 am and sunset at 4:39 pm. On the last day of December, sunrise is at 7:33 am and sunset at 4:49 pm EST.
Sunshine
The average sunshine in December in Williamsport is 3.9h.UV index
January through March, October through December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index estimate of 2, and below, represents a minimal health hazard from unsafe exposure to UV radiation for the average person.Note: In December, the maximum UV index of 2 suggests these recommendations:
Unlike children, who always need sun protection, most individuals can remain in the sun for up to an hour without getting burnt. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation. Foresee this! The reflection from snow can nearly double the intensity of UV radiation from the Sun.
Frequently asked questions
How cold is it in Williamsport in December?
What is the average humidity in December in Williamsport?
How much does it rain in Williamsport in December?
How much does it snow in Williamsport in December?
What is the month with the shortest days in Williamsport?
How many hours of daylight does Williamsport have in December?
When is the sunrise / sunset in December in Williamsport?
How long on average sun shines in December in Williamsport?
What is the month with the lowest UV index in Williamsport?
What is the UV index reading in December in Williamsport?
Average temperature in December
Williamsport, PA
- Average high temperature in December: 36.7°F
The warmest month (with the highest average high temperature) is July (81.7°F).
The month with the lowest average high temperature is January (30.6°F).
- Average low temperature in December: 26.6°F
The month with the highest average low temperature is July (59.2°F).
The coldest month (with the lowest average low temperature) is January (18.9°F).
Average pressure in December
Williamsport, PA
- Average pressure in December: 30.09"Hg
The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in December
Williamsport, PA
- Average wind speed in December: 7mph
The windiest months (with the highest average wind speed) are January, March and April (7.5mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).
Average humidity in December
Williamsport, PA
- Average humidity in December: 83%
The month with the highest relative humidity is February (84%).
The months with the lowest relative humidity are April and July (77%).
Average rainfall in December
Williamsport, PA
- Average rainfall in December: 1.14"
The wettest month (with the highest rainfall) is April (1.93").
The driest month (with the least rainfall) is November (0.94").
Average rainfall days in December
Williamsport, PA
- Average rainfall days in December: 10.6 days
The month with the highest number of rainy days is May (16.6 days).
The month with the least rainy days is February (7.5 days).
Average snowfall in December
Williamsport, PA
- Average snowfall in December: 1.38"
The month with the highest snowfall is February (2.28").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Williamsport, PA
- Average snowfall days in December: 8.1 days
The month with the highest number of snowfall days is January (11.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Williamsport, PA
- Average daylight in December: 9h and 2min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in December: 3h and 5min
The month with the most sunshine is July (Average sunshine: 10h and 6min).
The months with the least sunshine are January and February (Average sunshine: 3h and 42min).
Average sunshine days in December
Williamsport, PA
- Average sunshine days in December: 15.5 days
The month with the most sunshine days is November (18.7 days).
The month with the least sunshine days is May (11.8 days).
Average UV index in December
Williamsport, PA
- Average UV index in December: 2
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, March, October, November and December (UV index 2).
Average cloud cover in December
Williamsport, PA
- Average cloud cover in December: 59
The months with the most cloud cover are January and February (Cloud cover 60).
The month with the least cloud cover is July (Cloud cover 35).
Average visibility in December
Williamsport, PA
- Average visibility in December: 5mi
The month with the highest visibility is April (6mi).
The month with the lowest visibility is September (4mi).
Williamsport, Pennsylvania, USA
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