December weather forecastDecatur, TN
December
Weather in December
December, the first month of the winter in Decatur, is also a fresh month, with an average temperature varying between 50°F (10°C) and 35.8°F (2.1°C).Temperature
The shift from November to December coincides with a small decrease in the average high-temperature, down to a cool 50°F (10°C) from a mild 57.6°F (14.2°C). Throughout December, the temperature in Decatur, Tennessee, falls to an average low of 35.8°F (2.1°C).Humidity
The most humid month in Decatur is December, with an average relative humidity of 80%.Rainfall
The wettest months in Decatur are July and December, with an average 4.29" (109mm) of rainfall.Snowfall
Months with snowfall are January through April, November and December. In Decatur, Tennessee, during December, snow falls for 2.2 days and regularly aggregates up to 0.55" (14mm) of snow. In Decatur, Tennessee, during the entire year, snow falls for 14.8 days and aggregates up to 3.07" (78mm) of snow.Daylight
December has the shortest days of the year in Decatur, with an average of 9h and 48min of daylight.On the first day of December, sunrise is at 7:30 am and sunset at 5:26 pm. On the last day of the month, sunrise is at 7:48 am and sunset at 5:36 pm EST.
Sunshine
The month with the least sunshine in Decatur is December, with an average of 5h of sunshine.UV index
The months with the lowest UV index are January, February and December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a minimal health hazard from unprotected exposure to Sun's UV rays for ordinary individuals.Note: In December, a regular UV index of 2 translates into these guidelines:
Protection from prolonged sun exposure is necessary for babies, children, and individuals with sensitive skin. Considering the harmful UV rays from the Sun during midday, it's essential to reduce exposure. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation. Keep in mind! Snow's reflective quality can nearly double the intensity of the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Decatur, TN
- Average high temperature in December: 50°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 (45.5°F).
- Average low temperature in December: 35.8°F
The month with the highest average low temperature is July (65.8°F).
The coldest month (with the lowest average low temperature) is January (30.6°F).
Average pressure in December
Decatur, TN
- Average pressure in December: 30.15"Hg
The months with the highest atmospheric pressure are January and November (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.98"Hg).
Average wind speed in December
Decatur, TN
- Average wind speed in December: 5.8mph
The windiest months (with the highest average wind speed) are February, March and April (6.5mph).
The calmest months (with the lowest average wind speed) are July and August (3.9mph).
Average humidity in December
Decatur, TN
- Average humidity in December: 80%
The month with the highest relative humidity is December (80%).
The months with the lowest relative humidity are June, August, October and November (75%).
Average rainfall in December
Decatur, TN
- Average rainfall in December: 4.29"
The wettest months (with the highest rainfall) are July and December (4.29").
The driest month (with the least rainfall) is September (2.32").
Average rainfall days in December
Decatur, TN
- Average rainfall days in December: 13.6 days
The month with the highest number of rainy days is July (18.3 days).
The month with the least rainy days is November (9.5 days).
Average snowfall in December
Decatur, TN
- Average snowfall in December: 0.55"
The month with the highest snowfall is January (1.02").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Decatur, TN
- Average snowfall days in December: 2.2 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
Decatur, 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: 5h and 0min
The months with the most sunshine are June and July (Average sunshine: 10h and 24min).
The month with the least sunshine is December (Average sunshine: 5h and 0min).
Average sunshine days in December
Decatur, TN
- Average sunshine days in December: 15.7 days
The month with the most sunshine days is October (18.6 days).
The month with the least sunshine days is July (10.2 days).
Average UV index in December
Decatur, 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
Decatur, TN
- Average cloud cover in December: 48
The month with the most cloud cover is February (Cloud cover 52).
The month with the least cloud cover is June (Cloud cover 30).
Average visibility in December
Decatur, TN
- Average visibility in December: 6mi
The months with the highest visibility are February, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January and March (5mi).
