December weather forecastRound Rock, TN
December
Weather in December
The first month of the winter, December, is still a chilly month in Round Rock, Tennessee, with an average temperature varying between 47.8°F (8.8°C) and 34.3°F (1.3°C).Temperature
The advent of December brings a subtle shift in temperature, with the average high moving from a refreshing 55.8°F (13.2°C) in November to a frosty 47.8°F (8.8°C). Throughout the month of December, the nighttime temperature in Round Rock dips to an average of 34.3°F (1.3°C).Humidity
February and December, with an average relative humidity of 80%, are the most humid months in Round Rock.Rainfall
In Round Rock, during December, the rain falls for 15.1 days and regularly aggregates up to 3.58" (91mm) of precipitation. Throughout the year, there are 184.3 rainfall days, and 40.16" (1020mm) of precipitation is accumulated.Snowfall
January through April, October through December are months with snowfall. In Round Rock, in December, snow falls for 4.5 days, with typically accumulated 1.06" (27mm) of snow. In Round Rock, during the entire year, snow falls for 22.9 days and aggregates up to 6.61" (168mm) of snow.Daylight
December has the shortest days of the year, with an average of 9h and 42min of daylight.On the first day of the month, sunrise is at 7:30 am and sunset at 5:22 pm. On the last day of December, in Round Rock, sunrise is at 7:48 am and sunset at 5:32 pm EST.
Sunshine
The average sunshine in December in Round Rock is 4.9h.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 unprotected exposure to Sun's UV rays for average individuals.Note: A daily maximum UV index of 2 in December translates into the following instructions:
While extended sun exposure does not significantly affect most people, those with sensitive skin, children, and infants should always be protected. Direct exposure to the Sun's intense radiation around midday should be avoided for health reasons. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear. Stay alert! Snow's reflective properties can almost double the UV radiation from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Round Rock, TN
- Average high temperature in December: 47.8°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 (43.2°F).
- Average low temperature in December: 34.3°F
The month with the highest average low temperature is July (64.4°F).
The coldest month (with the lowest average low temperature) is January (28.9°F).
Average pressure in December
Round Rock, 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 (29.98"Hg).
Average wind speed in December
Round Rock, TN
- Average wind speed in December: 5.2mph
The windiest month (with the highest average wind speed) is April (6mph).
The calmest month (with the lowest average wind speed) is August (3.5mph).
Average humidity in December
Round Rock, TN
- Average humidity in December: 80%
The months with the highest relative humidity are February and December (80%).
The months with the lowest relative humidity are June, July and August (75%).
Average rainfall in December
Round Rock, TN
- Average rainfall in December: 3.58"
The wettest month (with the highest rainfall) is February (4.8").
The driest month (with the least rainfall) is September (2.2").
Average rainfall days in December
Round Rock, TN
- Average rainfall days in December: 15.1 days
The month with the highest number of rainy days is July (19.3 days).
The month with the least rainy days is November (10.7 days).
Average snowfall in December
Round Rock, TN
- Average snowfall in December: 1.06"
The month with the highest snowfall is February (2.2").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Round Rock, TN
- Average snowfall days in December: 4.5 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
Round Rock, 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 54min
The month with the most sunshine is June (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 4h and 48min).
Average sunshine days in December
Round Rock, TN
- Average sunshine days in December: 14.4 days
The month with the most sunshine days is November (16.9 days).
The month with the least sunshine days is July (9.8 days).
Average UV index in December
Round Rock, 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
Round Rock, TN
- Average cloud cover in December: 50
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
Round Rock, TN
- Average visibility in December: 5mi
The months with the highest visibility are April, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February, March, May and December (5mi).
