Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall in December
- Average snowfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
The commencement of December includes a gentle temperature shift, with the average high-temperature dropping a bit from a refreshing 57.9°F (14.4°C) in November to a cool 50.2°F (10.1°C). Rockville reports a consistent average low-temperature of 36.1°F (2.3°C) throughout December nights.Humidity
December is the most humid month, with an average relative humidity of 79%.Rainfall
In Rockville, in December, during 12.3 rainfall days, 3.7" (94mm) of precipitation is typically accumulated. Throughout the year, in Rockville, there are 159.4 rainfall days, and 35.71" (907mm) of precipitation is accumulated.Snowfall
January through April, October through December are months with snowfall. In Rockville, during December, snow falls for 2.4 days and regularly aggregates up to 0.51" (13mm) of snow. Throughout the year, there are 12.9 snowfall days, and 3.46" (88mm) of snow is accumulated.Daylight
December has the shortest days of the year in Rockville, with an average of 9h and 48min of daylight.On the first day of December, sunrise is at 7:29 am and sunset at 5:24 pm. On the last day of the month, sunrise is at 7:46 am and sunset at 5:34 pm EST.
Sunshine
The months with the least sunshine in Rockville are January and December, with an average of 5.1h of sunshine.UV index
January, February and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index of 2, and less, symbolizes a low threat to health from exposure to the Sun's UV radiation for average individuals.Note: In December, the maximum UV index of 2 translates into these guidelines:
Those with sensitive skin, infants, and children require constant safeguarding from prolonged sun exposure. To avoid the Sun's strongest rays, limit exposure around the mid-day period. Experience reduced UV exposure by about half when donning a wide-brim hat. Notice! The UV radiation of the Sun can be intensified nearly twofold due to the reflective quality of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in December in Rockville?
What is the most humid month in Rockville?
What is the average humidity in December in Rockville?
How much does it rain in Rockville in December?
How much does it snow in Rockville in December?
What is the month with the shortest days in Rockville?
How many hours of daylight does Rockville have in December?
When are sunrise and sunset in December in Rockville?
What is the month with the least sunshine in Rockville?
How long on average sun shines in December in Rockville?
When is the lowest UV index in Rockville?
How high is the UV index in December in Rockville?
Average temperature in December
Rockville, TN
- Average high temperature in December: 50.2°F
The warmest month (with the highest average high temperature) is July (87.3°F).
The month with the lowest average high temperature is January (45.7°F).
- Average low temperature in December: 36.1°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
Rockville, 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
Rockville, TN
- Average wind speed in December: 5.8mph
The windiest month (with the highest average wind speed) is April (6.5mph).
The calmest months (with the lowest average wind speed) are July and August (4mph).
Average humidity in December
Rockville, 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 (74%).
Average rainfall in December
Rockville, TN
- Average rainfall in December: 3.7"
The wettest month (with the highest rainfall) is February (3.9").
The driest month (with the least rainfall) is September (1.93").
Average rainfall days in December
Rockville, TN
- Average rainfall days in December: 12.3 days
The month with the highest number of rainy days is July (17.4 days).
The month with the least rainy days is November (8.8 days).
Average snowfall in December
Rockville, TN
- Average snowfall in December: 0.51"
The month with the highest snowfall is January (1.1").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Rockville, TN
- Average snowfall days in December: 2.4 days
The month with the highest number of snowfall days is January (4.1 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
Rockville, TN
- Average daylight in December: 9h and 5min
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 1min
The month with the most sunshine is June (Average sunshine: 10h and 42min).
The months with the least sunshine are January and December (Average sunshine: 5h and 6min).
Average sunshine days in December
Rockville, TN
- Average sunshine days in December: 16.8 days
The month with the most sunshine days is October (19.6 days).
The month with the least sunshine days is July (11.6 days).
Average UV index in December
Rockville, 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
Rockville, TN
- Average cloud cover in December: 48
The month with the most cloud cover is February (Cloud cover 51).
The month with the least cloud cover is June (Cloud cover 27).
Average visibility in December
Rockville, 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).
Rockville, Tennessee, USA
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