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 onset of December brings a small shift in high-temperatures, falling from a refreshing 57.4°F (14.1°C) in November to a chilly 49.6°F (9.8°C). Throughout December, the nighttime temperature averages to an icy 35.8°F (2.1°C).Humidity
The months with the highest humidity are March and December, with an average relative humidity of 79%.Rainfall
In Williamsport, in December, during 12.7 rainfall days, 3.11" (79mm) of precipitation is typically accumulated. Throughout the year, in Williamsport, there are 172.4 rainfall days, and 38.43" (976mm) of precipitation is accumulated.Snowfall
January through April, November and December are months with snowfall. In December, it is snowing for 1.4 days. Throughout December, 0.43" (11mm) of snow is accumulated. In Williamsport, during the entire year, snow falls for 8.9 days and aggregates up to 2.8" (71mm) of snow.Daylight
December has the shortest days of the year, with an average of 9h and 48min of daylight.On the first day of the month, sunrise is at 6:40 am and sunset at 4:35 pm. On the last day of December, sunrise is at 6:58 am and sunset at 4:45 pm CST.
Sunshine
In Williamsport, the average sunshine in December is 4.7h.UV index
With an average maximum UV index of 2, December is the month with the lowest UV index. A UV Index of 2, and less, symbolizes a low health risk from exposure to the Sun's UV rays for the average person.Note: A maximum high UV index of 2 in December translates into the following recommendations:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. The Sun's radiation is especially intense around midday; try to stay in shade during this period. A wide-brimmed hat provides unparalleled sun protection for sensitive areas like the eyes, ears, and neck. On your guard! Snow's reflection can almost double the intensity of the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in December?
What is the most humid month?
What is the average humidity in December?
How many days does it rain in December?
How much 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?
How high is the UV index in December?
Average temperature in December
Williamsport, TN
- Average high temperature in December: 49.6°F
The warmest month (with the highest average high temperature) is July (87.4°F).
The month with the lowest average high temperature is January (45.3°F).
- Average low temperature in December: 35.8°F
The month with the highest average low temperature is July (68.5°F).
The coldest month (with the lowest average low temperature) is January (30.9°F).
Average pressure in December
Williamsport, TN
- Average pressure in December: 30.15"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.97"Hg).
Average wind speed in December
Williamsport, TN
- Average wind speed in December: 8mph
The windiest month (with the highest average wind speed) is February (8.5mph).
The calmest months (with the lowest average wind speed) are July and August (4.7mph).
Average humidity in December
Williamsport, TN
- Average humidity in December: 79%
The months with the highest relative humidity are March and December (79%).
The month with the lowest relative humidity is October (74%).
Average rainfall in December
Williamsport, TN
- Average rainfall in December: 3.11"
The wettest months (with the highest rainfall) are February and July (4.06").
The driest month (with the least rainfall) is September (2.36").
Average rainfall days in December
Williamsport, TN
- Average rainfall days in December: 12.7 days
The month with the highest number of rainy days is July (19.6 days).
The month with the least rainy days is November (9.9 days).
Average snowfall in December
Williamsport, TN
- Average snowfall in December: 0.43"
The month with the highest snowfall is February (1.06").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Williamsport, TN
- Average snowfall days in December: 1.4 days
The months with the highest number of snowfall days are January and February (2.8 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Williamsport, TN
- Average daylight in December: 9h and 5min
The month with the longest days is June (Average daylight: 14h and 30min).
The month with the shortest days is December (Average daylight: 9h and 48min).
- Average sunshine in December: 4h and 4min
The month with the most sunshine is June (Average sunshine: 10h and 18min).
The months with the least sunshine are January and February (Average sunshine: 4h and 36min).
Average sunshine days in December
Williamsport, TN
- Average sunshine days in December: 15.5 days
The month with the most sunshine days is October (18.5 days).
The month with the least sunshine days is July (9.9 days).
Average UV index in December
Williamsport, TN
- Average UV index in December: 2
The months with the highest UV index are May, June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 2).
Average cloud cover in December
Williamsport, TN
- Average cloud cover in December: 51
The month with the most cloud cover is February (Cloud cover 53).
The month with the least cloud cover is June (Cloud cover 30).
Average visibility in December
Williamsport, TN
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, August, September, October, November and December (6mi).
The month with the lowest visibility is July (5mi).
Williamsport, Tennessee, USA
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