December weather forecastSwannsylvania, TN
December
Weather in December
The first month of the winter, December, is still a chilly month in Swannsylvania, Tennessee, with an average temperature ranging between max 48.7°F (9.3°C) and min 34.5°F (1.4°C).Temperature
A minor decrease in the average high-temperature is observed during December, shifting from a moderate 56.5°F (13.6°C) in November to a frosty 48.7°F (9.3°C). In the month of December, the average low-temperature usually rests at a cold 34.5°F (1.4°C).Humidity
December is the most humid month, with an average relative humidity of 79%.Rainfall
In Swannsylvania, in December, it is raining for 11.5 days, with typically 2.52" (64mm) of accumulated precipitation. In Swannsylvania, during the entire year, the rain falls for 150.7 days and collects up to 23.5" (597mm) of precipitation.Snowfall
Months with snowfall are January through April, October through December. In December, it is snowing for 3.1 days. Throughout December, 1.34" (34mm) of snow is accumulated. In Swannsylvania, during the entire year, snow falls for 17.2 days and aggregates up to 5.39" (137mm) 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 7:25 am and sunset at 5:19 pm. On the last day of December, in Swannsylvania, sunrise is at 7:43 am and sunset at 5:29 pm EST.
Sunshine
In Swannsylvania, the average sunshine in December is 5.5h.UV index
January, February and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.Note: A maximum UV index of 2 in December translates into the following recommendations:
Unlike children, who always need sun protection, most individuals can remain in the sun for up to an hour without getting burnt. For health reasons, it's advisable to reduce direct sun exposure during peak hours around midday. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation. Be mindful! The reflection from snow can increase the Sun's UV radiation nearly twice.
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Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Swannsylvania, TN
- Average high temperature in December: 48.7°F
The warmest month (with the highest average high temperature) is July (87.1°F).
The month with the lowest average high temperature is January (44.2°F).
- Average low temperature in December: 34.5°F
The month with the highest average low temperature is July (64°F).
The coldest month (with the lowest average low temperature) is January (28.6°F).
Average pressure in December
Swannsylvania, 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 (29.99"Hg).
Average wind speed in December
Swannsylvania, TN
- Average wind speed in December: 5.2mph
The windiest month (with the highest average wind speed) is April (6.1mph).
The calmest month (with the lowest average wind speed) is August (3.7mph).
Average humidity in December
Swannsylvania, TN
- Average humidity in December: 79%
The month with the highest relative humidity is December (79%).
The month with the lowest relative humidity is August (72%).
Average rainfall in December
Swannsylvania, TN
- Average rainfall in December: 2.52"
The wettest month (with the highest rainfall) is February (2.99").
The driest month (with the least rainfall) is September (1.22").
Average rainfall days in December
Swannsylvania, TN
- Average rainfall days in December: 11.5 days
The months with the highest number of rainy days are May and July (15.3 days).
The month with the least rainy days is November (9.1 days).
Average snowfall in December
Swannsylvania, TN
- Average snowfall in December: 1.34"
The month with the highest snowfall is January (1.46").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Swannsylvania, TN
- Average snowfall days in December: 3.1 days
The month with the highest number of snowfall days is January (4.8 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
Swannsylvania, TN
- Average daylight in December: 9h and 48min
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 48min).
- Average sunshine in December: 5h and 30min
The months with the most sunshine are June and July (Average sunshine: 10h and 54min).
The month with the least sunshine is January (Average sunshine: 5h and 12min).
Average sunshine days in December
Swannsylvania, TN
- Average sunshine days in December: 16.6 days
The month with the most sunshine days is October (19.8 days).
The month with the least sunshine days is July (12.3 days).
Average UV index in December
Swannsylvania, 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
Swannsylvania, TN
- Average cloud cover in December: 44
The month with the most cloud cover is February (Cloud cover 49).
The months with the least cloud cover are June and August (Cloud cover 26).
Average visibility in December
Swannsylvania, TN
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
