December weather forecastGrapevine, TX
December
Weather in December
December, the first month of the winter in Grapevine, is also a moderate month, with an average temperature fluctuating between 55.6°F (13.1°C) and 41.5°F (5.3°C).Temperature
A moderate decline in the average high-temperature is seen during December, decreasing from 64.6°F (18.1°C) in November to a still refreshing 55.6°F (13.1°C). The nighttime temperature dips to a cold 41.5°F (5.3°C) on average during December.Humidity
In Grapevine, the average relative humidity in December is 67%.Rainfall
In December, the rain falls for 6 days. Throughout December, 0.55" (14mm) of precipitation is accumulated. In Grapevine, during the entire year, the rain falls for 97.8 days and collects up to 9.29" (236mm) of precipitation.Snowfall
In Grapevine, snow does not fall in April through December.Daylight
The month with the shortest days is December, with an average of 10h and 0min of daylight.On the first day of the month, sunrise is at 7:13 am and sunset at 5:21 pm. On the last day of December, sunrise is at 7:30 am and sunset at 5:32 pm CST.
Sunshine
The month with the least sunshine is December, 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 value of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for the average person.Note: The maximum daily UV index of 3 in December converts into the following recommendations:
Be vigilant - A duty to shield skin and eyes from injury exists. The Sun's most harmful UV rays are emitted around midday; avoid staying outdoors for long during this time. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation. Be attentive! The reflective property of snow can nearly double the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Grapevine, TX
- Average high temperature in December: 55.6°F
The warmest month (with the highest average high temperature) is August (96.4°F).
The month with the lowest average high temperature is January (54.5°F).
- Average low temperature in December: 41.5°F
The month with the highest average low temperature is August (77.2°F).
The coldest month (with the lowest average low temperature) is January (38.8°F).
Average pressure in December
Grapevine, 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
Grapevine, TX
- Average wind speed in December: 8.6mph
The windiest months (with the highest average wind speed) are March and April (10.1mph).
The calmest month (with the lowest average wind speed) is September (6.7mph).
Average humidity in December
Grapevine, TX
- Average humidity in December: 67%
The month with the highest relative humidity is May (71%).
The month with the lowest relative humidity is August (54%).
Average rainfall in December
Grapevine, TX
- Average rainfall in December: 0.55"
The wettest month (with the highest rainfall) is May (1.34").
The driest month (with the least rainfall) is February (0.39").
Average rainfall days in December
Grapevine, TX
- Average rainfall days in December: 6 days
The month with the highest number of rainy days is September (10.5 days).
The month with the least rainy days is January (4.5 days).
Average snowfall in December
Grapevine, TX
- Average snowfall in December: 0"
The month with the highest snowfall is February (0.16").
The months with the least snowfall are April, May, June, July, August, September, October, November and December (0").
Average snowfall days in December
Grapevine, TX
- Average snowfall days in December: 0.3 days
The month with the highest number of snowfall days is February (0.9 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
Grapevine, 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
Grapevine, TX
- Average sunshine days in December: 23.4 days
The month with the most sunshine days is January (25.1 days).
The month with the least sunshine days is September (16.8 days).
Average UV index in December
Grapevine, 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
Grapevine, TX
- Average cloud cover in December: 36
The month with the most cloud cover is March (Cloud cover 40).
The month with the least cloud cover is August (Cloud cover 19).
Average visibility in December
Grapevine, 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).
