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
With December's onset, the weather reveals a slight temperature decrease, transitioning from a mild 57.4°F (14.1°C) in November to a frosty 49.6°F (9.8°C). During December, the temperature in Williamsport tends to dip to an average of 35.8°F (2.1°C) at night.Humidity
The months with the highest humidity in Williamsport are March and December, with an average relative humidity of 79%.Rainfall
In Williamsport, in December, it is raining for 12.7 days, with typically 3.11" (79mm) of accumulated precipitation. In Williamsport, during the entire year, the rain falls for 172.4 days and collects up to 38.43" (976mm) of precipitation.Snowfall
Months with snowfall are January through April, November and December. In Williamsport, Tennessee, in December, during 1.4 snowfall days, 0.43" (11mm) of snow is typically 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, in Williamsport, 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 in Williamsport. A UV Index estimate of 2, and below, represents a minimal health hazard from unsafe exposure to UV radiation for average individuals.Note: In December, a daily maximum UV index of 2 leads to the following instructions:
Most people face no serious problems with extended sun exposure, but those with fair skin, infants, and children always need protection. Direct exposure to the Sun's intense radiation around midday should be avoided for health reasons. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Warning! The reflection from snow can nearly magnify the Sun's UV radiation twofold.
Frequently asked questions
What is the usual temperature for Williamsport in December?
What is the most humid month in Williamsport?
What is the average humidity in December in Williamsport?
How many days does it rain in December in Williamsport?
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 long on average sun shines in December in Williamsport?
When is the lowest UV index in Williamsport?
How high is the UV index in December in Williamsport?
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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