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
Setting in of December comes with a decrease in the average high-temperature, moving from a chilly 46.2°F (7.9°C) in November to a cold 36.7°F (2.6°C). The low-temperature average for South Williamsport during December stands at a freezing cold 26.6°F (-3°C).Humidity
The average relative humidity in December in South Williamsport is 83%.Rainfall
In South Williamsport, in December, during 10.6 rainfall days, 1.14" (29mm) of precipitation is typically accumulated. In South Williamsport, Pennsylvania, during the entire year, the rain falls for 145.2 days and collects up to 16.57" (421mm) of precipitation.Snowfall
January through April, October through December are months with snowfall in South Williamsport. In South Williamsport, in December, snow falls for 8.1 days, with typically accumulated 1.38" (35mm) of snow. In South 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 South 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, in South Williamsport, sunrise is at 7:33 am and sunset at 4:49 pm EST.
Sunshine
In December, the average sunshine 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 value of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV rays for the ordinary person.Note: In December, the UV index of 2 transforms into the following advice:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. Around midday, solar radiation is most harmful; hence, exposure should be limited. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage. Be watchful! The reflection of snow can enhance the intensity of the Sun's UV radiation nearly double.
Frequently asked questions
How cold is December in South Williamsport?
What is the average humidity in December in South Williamsport?
How many days does it rain in December in South Williamsport?
How much does it snow in South Williamsport in December?
What is the month with the shortest days in South Williamsport?
What is the average length of the day in December in South Williamsport?
What time are sunrise and sunset in December in South Williamsport?
How long on average sun shines in December in South Williamsport?
What is the month with the lowest UV index in South Williamsport?
How high is the UV index in December in South Williamsport?
Average temperature in December
South 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
South 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
South 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
South 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
South 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
South 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
South 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
South 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
South 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
South 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
South 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
South 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
South 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).
South Williamsport, Pennsylvania, USA
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