December weather forecastMercer, TN
December
Weather in December
The first month of the winter, December, is still a chilly month in Mercer, Tennessee, with an average temperature ranging between max 49.5°F (9.7°C) and min 36.7°F (2.6°C).Temperature
Mercer's weather in December involves a mild decrease in the average high-temperature, moving down slightly from November's moderate 57.7°F (14.3°C) to a chilly 49.5°F (9.7°C). During the month of December, an average temperature of 36.7°F (2.6°C) is noted during the nights in Mercer.Humidity
The average relative humidity in December is 78%.Rainfall
In Mercer, during December, the rain falls for 9.7 days and regularly aggregates up to 1.57" (40mm) of precipitation. In Mercer, during the entire year, the rain falls for 125.3 days and collects up to 15.47" (393mm) of precipitation.Snowfall
January through March, November and December are months with snowfall in Mercer. December is the month with the most snowfall in Mercer, Tennessee. Snow falls for 0.9 days and accumulates 0.31" (8mm) of snow.Daylight
With an average of 9h and 48min of daylight, December has the shortest days of the year in Mercer.On the first day of December, sunrise is at 6:47 am and sunset at 4:43 pm. On the last day of the month, sunrise is at 7:05 am and sunset at 4:53 pm CST.
Sunshine
In December, the average sunshine in Mercer is 4.9h.UV index
December is the month with the lowest UV index, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a minimal health hazard from exposure to the Sun's UV radiation for ordinary individuals.Note: A maximum UV index of 2 in December translates into the following recommendations:
Prolonged exposure to sunlight rarely troubles the majority, but constant protection is vital for babies, children, and fair-skinned people. To prevent harmful UV exposure, minimize direct contact with the Sun around midday. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized. Take into account! The reflection from snow can nearly double the Sun's UV radiation intensity.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Mercer, TN
- Average high temperature in December: 49.5°F
The warmest month (with the highest average high temperature) is July (87.6°F).
The month with the lowest average high temperature is January (45.7°F).
- Average low temperature in December: 36.7°F
The month with the highest average low temperature is July (70°F).
The coldest month (with the lowest average low temperature) is January (32°F).
Average pressure in December
Mercer, TN
- Average pressure in December: 30.14"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).
Average wind speed in December
Mercer, TN
- Average wind speed in December: 8.3mph
The windiest month (with the highest average wind speed) is February (9.1mph).
The calmest month (with the lowest average wind speed) is July (5.2mph).
Average humidity in December
Mercer, TN
- Average humidity in December: 78%
The month with the highest relative humidity is March (80%).
The month with the lowest relative humidity is October (71%).
Average rainfall in December
Mercer, TN
- Average rainfall in December: 1.57"
The wettest month (with the highest rainfall) is July (1.85").
The driest month (with the least rainfall) is September (0.67").
Average rainfall days in December
Mercer, TN
- Average rainfall days in December: 9.7 days
The month with the highest number of rainy days is July (14.3 days).
The month with the least rainy days is November (7.1 days).
Average snowfall in December
Mercer, TN
- Average snowfall in December: 0.31"
The month with the highest snowfall is December (0.31").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in December
Mercer, TN
- Average snowfall days in December: 0.9 days
The month with the highest number of snowfall days is February (2.2 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
Mercer, TN
- Average daylight in December: 9h and 48min
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 54min
The month with the most sunshine is June (Average sunshine: 10h and 42min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).
Average sunshine days in December
Mercer, TN
- Average sunshine days in December: 19.7 days
The month with the most sunshine days is October (20.8 days).
The month with the least sunshine days is July (13.8 days).
Average UV index in December
Mercer, TN
- Average UV index in December: 2
The months with the highest UV index are June and July (UV index 7).
The month with the lowest UV index is December (UV index 2).
Average cloud cover in December
Mercer, TN
- Average cloud cover in December: 48
The month with the most cloud cover is February (Cloud cover 49).
The month with the least cloud cover is June (Cloud cover 26).
Average visibility in December
Mercer, 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).
