December weather forecastKeller, TX
December
Weather in December
The first month of the winter, December, is also a moderate month in Keller, Texas, with temperature in the range of an average low of 40.6°F (4.8°C) and an average high of 55.4°F (13°C).Temperature
The arrival of December corresponds with a shift in temperature, down from a refreshing 64.6°F (18.1°C) in November to a moderate 55.4°F (13°C). During December, Keller records an average temperature of 40.6°F (4.8°C) at night.Humidity
In Keller, the average relative humidity in December is 67%.Rainfall
The month with the least rainfall is December, when the rain falls for 5.5 days and typically collects 0.55" (14mm) of precipitation.Snowfall
February, March and December are months with snowfall. December is the first month it typically snows. Throughout December, in the average 0.4 snowfall days, it receives 0.04" (1mm) of snow. In Keller, during the entire year, snow falls for 1.4 days and aggregates up to 0.39" (10mm) of snow.Daylight
The month with the shortest days is December, with an average of 10h and 0min of daylight.On the first day of December, sunrise is at 7:14 am and sunset at 5:22 pm. On the last day of the month, sunrise is at 7:31 am and sunset at 5:32 pm CST.
Sunshine
December has the least sunshine of the year, with an average of 5.7h 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 of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for the average person.Note: The daily high UV index of 3 during December translates into the following recommendations:
Exercise caution. The susceptibility of light skin individuals to burns is less than 30 minutes. Solar radiation is at its peak intensity during midday, so it's advisable to stay indoors or in the shade. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays. Mark this! Snow reflection can nearly double the UV radiation intensity from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Keller, TX
- Average high temperature in December: 55.4°F
The warmest month (with the highest average high temperature) is August (95.9°F).
The month with the lowest average high temperature is January (54.5°F).
- Average low temperature in December: 40.6°F
The months with the highest average low temperature are July and August (75.7°F).
The coldest month (with the lowest average low temperature) is January (38.3°F).
Average pressure in December
Keller, 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 (29.9"Hg).
Average wind speed in December
Keller, TX
- Average wind speed in December: 8.8mph
The windiest month (with the highest average wind speed) is April (10.4mph).
The calmest month (with the lowest average wind speed) is September (6.8mph).
Average humidity in December
Keller, TX
- Average humidity in December: 67%
The month with the highest relative humidity is May (73%).
The month with the lowest relative humidity is August (55%).
Average rainfall in December
Keller, TX
- Average rainfall in December: 0.55"
The wettest month (with the highest rainfall) is May (2.09").
The driest month (with the least rainfall) is December (0.55").
Average rainfall days in December
Keller, TX
- Average rainfall days in December: 5.5 days
The month with the highest number of rainy days is May (11.9 days).
The month with the least rainy days is January (4 days).
Average snowfall in December
Keller, TX
- Average snowfall in December: 0.04"
The month with the highest snowfall is February (0.31").
The months with the least snowfall are January, April, May, June, July, August, September, October and November (0").
Average snowfall days in December
Keller, TX
- Average snowfall days in December: 0.4 days
The month with the highest number of snowfall days is February (0.8 days).
The months with the least snowfall days are January, April, May, June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
Keller, 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 42min
The month with the most sunshine is July (Average sunshine: 11h and 6min).
The month with the least sunshine is December (Average sunshine: 5h and 42min).
Average sunshine days in December
Keller, TX
- Average sunshine days in December: 24.3 days
The month with the most sunshine days is January (26.2 days).
The month with the least sunshine days is May (15.9 days).
Average UV index in December
Keller, 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
Keller, TX
- Average cloud cover in December: 35
The month with the most cloud cover is March (Cloud cover 38).
The month with the least cloud cover is August (Cloud cover 19).
Average visibility in December
Keller, 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).
