December weather forecastSun Valley, TN
December
Weather in December
The first month of the winter, December, is still a chilly month in Sun Valley, Tennessee, with an average temperature ranging between min 34.7°F (1.5°C) and max 48.2°F (9°C).Temperature
The arrival of December suggests a slight decrease in the average high-temperature, moving from a moderate 56.3°F (13.5°C) in November to a frosty 48.2°F (9°C). The low-temperature average for Sun Valley during December stands at an icy 34.7°F (1.5°C).Humidity
February, March and December, with an average relative humidity of 79%, are the most humid months.Rainfall
In Sun Valley, in December, during 13.6 rainfall days, 3.11" (79mm) of precipitation is typically accumulated. In Sun Valley, during the entire year, the rain falls for 173.9 days and collects up to 38.31" (973mm) of precipitation.Snowfall
Months with snowfall are January through April, November and December. In Sun Valley, Tennessee, in December, snow falls for 2.6 days, with typically accumulated 0.51" (13mm) of snow. Throughout the year, there are 13.7 snowfall days, and 2.99" (76mm) of snow is accumulated.Daylight
The month with the shortest days is December, with an average of 9h and 42min of daylight.On the first day of December, sunrise is at 6:35 am and sunset at 4:27 pm. On the last day of the month, sunrise is at 6:53 am and sunset at 4:37 pm CST.
Sunshine
In December, the average sunshine in Sun Valley is 4.7h.UV index
January, February and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index of 2, and less, symbolizes a low health risk from exposure to the Sun's UV radiation for average individuals.Note: A maximum high daily UV index of 2 during December translates into the following directions:
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. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes. Attention! Nearly twice the Sun's UV radiation can be reflected by snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Sun Valley, TN
- Average high temperature in December: 48.2°F
The warmest month (with the highest average high temperature) is July (86.5°F).
The month with the lowest average high temperature is January (43.5°F).
- Average low temperature in December: 34.7°F
The month with the highest average low temperature is July (65.5°F).
The coldest month (with the lowest average low temperature) is January (29.3°F).
Average pressure in December
Sun Valley, TN
- Average pressure in December: 30.14"Hg
The months with the highest atmospheric pressure are January and November (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.97"Hg).
Average wind speed in December
Sun Valley, TN
- Average wind speed in December: 6.8mph
The windiest month (with the highest average wind speed) is February (7.5mph).
The calmest months (with the lowest average wind speed) are July and August (4.3mph).
Average humidity in December
Sun Valley, TN
- Average humidity in December: 79%
The months with the highest relative humidity are February, March and December (79%).
The month with the lowest relative humidity is November (75%).
Average rainfall in December
Sun Valley, TN
- Average rainfall in December: 3.11"
The wettest month (with the highest rainfall) is February (4.09").
The driest month (with the least rainfall) is September (2.01").
Average rainfall days in December
Sun Valley, TN
- Average rainfall days in December: 13.6 days
The month with the highest number of rainy days is July (18.1 days).
The month with the least rainy days is November (10.8 days).
Average snowfall in December
Sun Valley, TN
- Average snowfall in December: 0.51"
The month with the highest snowfall is February (1.02").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Sun Valley, TN
- Average snowfall days in December: 2.6 days
The month with the highest number of snowfall days is January (4.6 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
Sun Valley, TN
- Average daylight in December: 9h and 42min
The month with the longest days is June (Average daylight: 14h and 36min).
The month with the shortest days is December (Average daylight: 9h and 42min).
- Average sunshine in December: 4h and 42min
The month with the most sunshine is June (Average sunshine: 10h and 36min).
The month with the least sunshine is February (Average sunshine: 4h and 24min).
Average sunshine days in December
Sun Valley, TN
- Average sunshine days in December: 15.2 days
The month with the most sunshine days is October (18.2 days).
The months with the least sunshine days are February and July (11.3 days).
Average UV index in December
Sun Valley, TN
- 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 and December (UV index 2).
Average cloud cover in December
Sun Valley, TN
- Average cloud cover in December: 51
The month with the most cloud cover is February (Cloud cover 54).
The month with the least cloud cover is June (Cloud cover 29).
Average visibility in December
Sun Valley, TN
- Average visibility in December: 6mi
The months with the highest visibility are February, March, April, June, October, November and December (6mi).
The months with the lowest visibility are January, May, July, August and September (5mi).
