December weather forecastRichardson, TX
December
Weather in December
Rounding off the year, December in Richardson is synonymous with diminished daylight, increased cloudiness, and a proportional reduction in sunshine. The likelihood for a white Christmas is minimal, with rare bouts of snowfall. It is during these chilly last days of December that Richardson experiences temperatures swaying from 41.5°F (5.3°C) to a relatively mild 55°F (12.8°C).Temperature
In Richardson, entering December brings a temperature decrement, reducing from November's enjoyable 64°F (17.8°C) to a fresh 55°F (12.8°C). During the month of December, an average low-temperature of 41.5°F (5.3°C) is recorded.Humidity
The average relative humidity in December is 69%.Rainfall
In Richardson, during December, the rain falls for 8.1 days and regularly aggregates up to 0.94" (24mm) of precipitation. Throughout the year, there are 118.4 rainfall days, and 15.51" (394mm) of precipitation is accumulated.Snowfall
January, February, November and December are months with snowfall. In Richardson, during December, snow falls for 0.3 days and regularly aggregates up to 0.04" (1mm) of snow. In Richardson, during the entire year, snow falls for 2.3 days and aggregates up to 0.51" (13mm) of snow.Daylight
With an average of 10h and 0min of daylight, December has the shortest days of the year in Richardson.On the first day of December, sunrise is at 7:12 am and sunset at 5:20 pm. On the last day of the month, sunrise is at 7:29 am and sunset at 5:30 pm CST.
Sunshine
The month with the least sunshine is December, with an average of 5.6h of sunshine.UV index
January and December, with an average maximum UV index of 3, are months with the lowest UV index. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for the average person.Note: The maximum UV index of 3 during December leads to these instructions:
Undertake precautions - It is suggested to shield oneself from sunburn. Direct exposure to the Sun's intense radiation around midday should be avoided for health reasons. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays. Alert! The snow's reflection can amplify the UV radiation of the Sun nearly twice.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Richardson, TX
- Average high temperature in December: 55°F
The warmest month (with the highest average high temperature) is August (95.7°F).
The month with the lowest average high temperature is January (54°F).
- Average low temperature in December: 41.5°F
The month with the highest average low temperature is August (76.5°F).
The coldest month (with the lowest average low temperature) is January (38.7°F).
Average pressure in December
Richardson, TX
- Average pressure in December: 30.13"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in December
Richardson, TX
- Average wind speed in December: 8.5mph
The windiest months (with the highest average wind speed) are March and April (9.9mph).
The calmest month (with the lowest average wind speed) is September (6.7mph).
Average humidity in December
Richardson, TX
- Average humidity in December: 69%
The month with the highest relative humidity is May (73%).
The month with the lowest relative humidity is August (56%).
Average rainfall in December
Richardson, TX
- Average rainfall in December: 0.94"
The wettest month (with the highest rainfall) is May (1.97").
The driest month (with the least rainfall) is February (0.75").
Average rainfall days in December
Richardson, TX
- Average rainfall days in December: 8.1 days
The month with the highest number of rainy days is September (13.1 days).
The month with the least rainy days is January (5.4 days).
Average snowfall in December
Richardson, TX
- Average snowfall in December: 0.04"
The month with the highest snowfall is February (0.31").
The months with the least snowfall are March, April, May, June, July, August, September and October (0").
Average snowfall days in December
Richardson, TX
- Average snowfall days in December: 0.3 days
The month with the highest number of snowfall days is February (1.3 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
Richardson, 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 36min
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 36min).
Average sunshine days in December
Richardson, TX
- Average sunshine days in December: 20.8 days
The month with the most sunshine days is January (23.7 days).
The month with the least sunshine days is September (14.5 days).
Average UV index in December
Richardson, TX
- Average UV index in December: 3
The months with the highest UV index are May, 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
Richardson, TX
- Average cloud cover in December: 38
The months with the most cloud cover are February and March (Cloud cover 41).
The month with the least cloud cover is August (Cloud cover 20).
Average visibility in December
Richardson, TX
- 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).
