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
In Williamsport, the average high-temperature in December drops from a fresh 50.5°F (10.3°C) in November to an icy 40.5°F (4.7°C). December brings with it a nighttime average temperature of 29.7°F (-1.3°C).Humidity
In Williamsport, Ohio, the average relative humidity in December is 81%.Rainfall
In Williamsport, during December, the rain falls for 11.7 days and regularly aggregates up to 2.8" (71mm) of precipitation. Throughout the year, there are 168.9 rainfall days, and 32.4" (823mm) of precipitation is accumulated.Snowfall
January through April, October through December are months with snowfall. In December, it is snowing for 8.4 days. Throughout December, 2.64" (67mm) of snow is accumulated. Throughout the year, there are 39.4 snowfall days, and 13.58" (345mm) of snow is accumulated.Daylight
December has the shortest days of the year, with an average of 9h and 24min of daylight.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, in Williamsport, sunrise is at 7:52 am and sunset at 5:18 pm EST.
Sunshine
In December, the average sunshine is 4.2h.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Williamsport. A UV Index reading of 2, and below, represents a low threat to health from unsafe exposure to UV radiation for the ordinary person.Note: In December, an average UV index of 2 transforms into the following instructions:
Despite most people tolerating extended sun exposure, it is critical to always protect those with sensitive skin, infants, and children. To protect against the Sun's most potent rays, avoid direct exposure around midday. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration. Keep in mind! Snow's reflective quality can nearly double the intensity of the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Is it cold during December?
What is the average humidity in December?
How much does it rain in December?
How many days does it snow in December?
What is the month with the shortest days?
How many hours of daylight does Williamsport have in December?
What time are sunrise and sunset in December?
How many hours of sunshine does Williamsport have in December?
What is the month with the lowest UV index?
What is the UV index reading in December?
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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