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
December
Weather in December
Temperature
In December, the meteorological conditions alter, with the average high-temperature shifting from a comfortable 17.8°C in November to a cool 12.8°C. December witnesses an average low-temperature hovering around an icy 5.1°C.Humidity
In December, the average relative humidity is 72%.Rainfall
In Rockwall, in December, it is raining for 9.9 days, with typically 58mm of accumulated precipitation. Throughout the year, there are 146.2 rainfall days, and 836mm of precipitation is accumulated.Snowfall
March through October and December are months without snowfall.Daylight
December has the shortest days of the year, with an average of 10h and 0min of daylight.On the first day of December, sunrise is at 7:11 am and sunset at 5:19 pm. On the last day of the month, sunrise is at 7:28 am and sunset at 5:29 pm CST.
Sunshine
December has the least sunshine of the year in Rockwall, with an average of 5.4h of sunshine.UV index
The months with the lowest UV index are January and December, with an average maximum UV index of 3. A UV Index estimate of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The UV index of 3 during December leads to these advisories:
Exercise prudence. Persons with fair skin could be burned in under 30 minutes. Exposing oneself to the midday Sun can be harmful due to the strong UV radiation; limit your time outside. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses. Heed this! Snow reflection can almost augment the UV radiation of the sun by double.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in December?
What is the average humidity in December?
How much does it rain in December?
When it does not snow in Rockwall?
Does it snow in December?
What is the month with the shortest days?
How many hours of daylight does Rockwall have in December?
What time are sunrise and sunset in December?
What is the month with the least sunshine?
How many hours of sunshine does Rockwall have in December?
What is the month with the lowest UV index?
How high is the UV index in December?
Average temperature in December
Rockwall, TX
- Average high temperature in December: 12.8°C
The warmest month (with the highest average high temperature) is August (35°C).
The month with the lowest average high temperature is January (12.2°C).
- Average low temperature in December: 5.1°C
The months with the highest average low temperature are July and August (23.8°C).
The coldest month (with the lowest average low temperature) is January (3.6°C).
Average pressure in December
Rockwall, TX
- Average pressure in December: 1020.2mbar
The month with the highest atmospheric pressure is January (1021.5mbar).
The month with the lowest atmospheric pressure is June (1012.9mbar).
Average wind speed in December
Rockwall, TX
- Average wind speed in December: 13.6km/h
The windiest month (with the highest average wind speed) is March (15.5km/h).
The calmest month (with the lowest average wind speed) is September (10.6km/h).
Average humidity in December
Rockwall, TX
- Average humidity in December: 72%
The month with the highest relative humidity is May (77%).
The month with the lowest relative humidity is August (60%).
Average rainfall in December
Rockwall, TX
- Average rainfall in December: 58mm
The wettest month (with the highest rainfall) is October (107mm).
The driest month (with the least rainfall) is January (46mm).
Average rainfall days in December
Rockwall, TX
- Average rainfall days in December: 9.9 days
The month with the highest number of rainy days is September (15.2 days).
The month with the least rainy days is January (7.8 days).
Average snowfall in December
Rockwall, TX
- Average snowfall in December: 0mm
The month with the highest snowfall is February (22mm).
The months with the least snowfall are March, April, May, June, July, August, September, October and December (0mm).
Average snowfall days in December
Rockwall, TX
- Average snowfall days in December: 0.2 days
The month with the highest number of snowfall days is February (1.4 days).
The months with the least snowfall days are March, April, May, June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
Rockwall, TX
- Average daylight in December: 10h and 0min
The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 0min).
- Average sunshine in December: 5h and 2min
The month with the most sunshine is August (Average sunshine: 11h and 6min).
The month with the least sunshine is December (Average sunshine: 5h and 24min).
Average sunshine days in December
Rockwall, TX
- Average sunshine days in December: 18.6 days
The month with the most sunshine days is January (21.4 days).
The month with the least sunshine days is September (13.4 days).
Average UV index in December
Rockwall, TX
- Average UV index in December: 3
The months with the highest UV index are June, July and August (UV index 7).
The months with the lowest UV index are January and December (UV index 3).
Average cloud cover in December
Rockwall, TX
- Average cloud cover in December: 40
The months with the most cloud cover are February and March (Cloud cover 43).
The month with the least cloud cover is August (Cloud cover 21).
Average visibility in December
Rockwall, TX
- Average visibility in December: 9km
The months with the highest visibility are June and August (10km).
The months with the lowest visibility are January, February, March, April, May, July, September, October, November and December (9km).