December weather forecastGrimsley, TN
December
Weather in December
The first month of the winter, December, is also a frosty month in Grimsley, Tennessee, with an average temperature varying between 33.6°F (0.9°C) and 46.9°F (8.3°C).Temperature
With the arrival of December, Grimsley experiences a modest decline in average high-temperatures, transitioning from a cool 54.7°F (12.6°C) in November to a chilly 46.9°F (8.3°C). In December, Grimsley encounters an average low-temperature of 33.6°F (0.9°C) during the night.Humidity
With an average relative humidity of 81%, December is the most humid month.Rainfall
In Grimsley, in December, it is raining for 12.8 days, with typically 3.19" (81mm) of accumulated precipitation. In Grimsley, during the entire year, the rain falls for 170.9 days and collects up to 37.68" (957mm) of precipitation.Snowfall
Months with snowfall are January through April, October through December. In Grimsley, in December, snow falls for 5.2 days, with typically accumulated 1.65" (42mm) of snow. In Grimsley, during the entire year, snow falls for 26.1 days and aggregates up to 9.72" (247mm) of snow.Daylight
With an average of 9h and 42min of daylight, December has the shortest days of the year.On the first day of the month, sunrise is at 6:33 am and sunset at 4:25 pm. On the last day of December, sunrise is at 6:51 am and sunset at 4:35 pm CST.
Sunshine
In December, the average sunshine is 4.5h.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 reading of 2, and below, represents a low health risk from exposure to the Sun's UV radiation for the average person.Note: The maximum daily UV index of 2 during December translates into the following directions:
Extended sunlight exposure does not pose significant problems for most people, except for children, infants, and people with fair skin who always need shielding. The midday Sun can be harmful due to its potent UV radiation; seek shade and reduce exposure. Stay sun-safe with clothing that is both closely woven and worn loosely. Remember! The Sun's UV radiation can be magnified almost twofold by the reflection of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Grimsley, TN
- Average high temperature in December: 46.9°F
The warmest month (with the highest average high temperature) is July (85.6°F).
The month with the lowest average high temperature is January (41.7°F).
- Average low temperature in December: 33.6°F
The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (27.7°F).
Average pressure in December
Grimsley, TN
- Average pressure in December: 30.14"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.97"Hg).
Average wind speed in December
Grimsley, TN
- Average wind speed in December: 6.6mph
The windiest month (with the highest average wind speed) is February (7.3mph).
The calmest month (with the lowest average wind speed) is August (4mph).
Average humidity in December
Grimsley, TN
- Average humidity in December: 81%
The month with the highest relative humidity is December (81%).
The months with the lowest relative humidity are April, June, August, October and November (77%).
Average rainfall in December
Grimsley, TN
- Average rainfall in December: 3.19"
The wettest month (with the highest rainfall) is February (4.13").
The driest month (with the least rainfall) is September (2.32").
Average rainfall days in December
Grimsley, TN
- Average rainfall days in December: 12.8 days
The month with the highest number of rainy days is July (18.2 days).
The month with the least rainy days is November (10.4 days).
Average snowfall in December
Grimsley, TN
- Average snowfall in December: 1.65"
The month with the highest snowfall is February (3.94").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Grimsley, TN
- Average snowfall days in December: 5.2 days
The month with the highest number of snowfall days is January (7.1 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
Grimsley, 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 30min
The month with the most sunshine is June (Average sunshine: 10h and 18min).
The month with the least sunshine is February (Average sunshine: 4h and 12min).
Average sunshine days in December
Grimsley, TN
- Average sunshine days in December: 13.5 days
The month with the most sunshine days is October (18 days).
The month with the least sunshine days is July (10.5 days).
Average UV index in December
Grimsley, 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
Grimsley, TN
- Average cloud cover in December: 54
The month with the most cloud cover is February (Cloud cover 57).
The month with the least cloud cover is June (Cloud cover 32).
Average visibility in December
Grimsley, TN
- Average visibility in December: 5mi
The months with the highest visibility are April and November (6mi).
The months with the lowest visibility are January, February, March, May, June, July, August, September, October and December (5mi).
