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
Transition from November to December is accompanied by a temperature drop, with average high-temperatures decreasing from a fresh 50.5°F (10.3°C) to an icy 40.5°F (4.7°C). During December, the average low-temperature in Williamsport is a subzero cold 29.7°F (-1.3°C).Humidity
In Williamsport, Ohio, the average relative humidity in December is 81%.Rainfall
In Williamsport, Ohio, during December, the rain falls for 11.7 days and regularly aggregates up to 2.8" (71mm) of precipitation. In Williamsport, during the entire year, the rain falls for 168.9 days and collects up to 32.4" (823mm) of precipitation.Snowfall
January through April, October through December are months with snowfall. In Williamsport, in December, during 8.4 snowfall days, 2.64" (67mm) of snow is typically accumulated. In Williamsport, Ohio, during the entire year, snow falls for 39.4 days and aggregates up to 13.58" (345mm) of snow.Daylight
With an average of 9h and 24min of daylight, December has the shortest days of the year in Williamsport, Ohio.On the first day of the month, sunrise is at 7:34 am and sunset at 5:08 pm. On the last day of December, sunrise is at 7:52 am and sunset at 5:18 pm EST.
Sunshine
In Williamsport, the average sunshine in December is 4.2h.UV index
The months with the lowest UV index in Williamsport are January, February, November and December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a minimal health hazard from unprotected exposure to Sun's UV rays for the average person.Note: A maximum daily UV index of 2 during December morphs into the following directions:
Prolonged exposure to sunlight rarely troubles the majority, but constant protection is vital for babies, children, and fair-skinned people. UV radiation is strongest from the Sun during midday; protect yourself by staying in shaded areas. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation. Take precaution! The reflection from snow can almost double the UV radiation of the Sun.
Frequently asked questions
Is it cold in Williamsport during December?
What is the average humidity in December in Williamsport?
How much does it rain in Williamsport in December?
How many days does it snow in December in Williamsport?
What is the month with the shortest days in Williamsport?
What is the average length of the day in December in Williamsport?
What time are sunrise and sunset in December in Williamsport?
How many hours of sunshine does Williamsport have in December?
What are the months with the lowest UV index in Williamsport?
What is the UV index reading in December in Williamsport?
Average temperature in December
Williamsport, OH
- Average high temperature in December: 40.5°F
The warmest month (with the highest average high temperature) is July (82.8°F).
The month with the lowest average high temperature is January (34.9°F).
- Average low temperature in December: 29.7°F
The month with the highest average low temperature is July (64.2°F).
The coldest month (with the lowest average low temperature) is January (22.3°F).
Average pressure in December
Williamsport, OH
- Average pressure in December: 30.13"Hg
The months with the highest atmospheric pressure are January and November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in December
Williamsport, OH
- Average wind speed in December: 8.3mph
The windiest month (with the highest average wind speed) is January (8.9mph).
The calmest months (with the lowest average wind speed) are July and August (5.2mph).
Average humidity in December
Williamsport, OH
- Average humidity in December: 81%
The months with the highest relative humidity are January and February (82%).
The months with the lowest relative humidity are October and November (75%).
Average rainfall in December
Williamsport, OH
- Average rainfall in December: 2.8"
The wettest month (with the highest rainfall) is May (3.74").
The driest month (with the least rainfall) is September (1.93").
Average rainfall days in December
Williamsport, OH
- Average rainfall days in December: 11.7 days
The month with the highest number of rainy days is May (18.8 days).
The month with the least rainy days is January (9.7 days).
Average snowfall in December
Williamsport, OH
- Average snowfall in December: 2.64"
The months with the highest snowfall are January and February (3.43").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Williamsport, OH
- Average snowfall days in December: 8.4 days
The month with the highest number of snowfall days is January (11.9 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, OH
- Average daylight in December: 9h and 2min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in December: 4h and 1min
The month with the most sunshine is August (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in December
Williamsport, OH
- Average sunshine days in December: 12.9 days
The month with the most sunshine days is November (17.3 days).
The month with the least sunshine days is May (9.2 days).
Average UV index in December
Williamsport, OH
- Average UV index in December: 2
The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in December
Williamsport, OH
- Average cloud cover in December: 57
The month with the most cloud cover is January (Cloud cover 61).
The month with the least cloud cover is August (Cloud cover 28).
Average visibility in December
Williamsport, OH
- Average visibility in December: 6mi
The months with the highest visibility are March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January and February (5mi).
Williamsport, Ohio, USA
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