December weather forecastMountain Valley, AR
December
Weather in December
The first month of the winter, December, is still a cool month in Mountain Valley, Arkansas, with an average temperature fluctuating between 36.5°F (2.5°C) and 50.9°F (10.5°C).Temperature
The transition into December is accompanied by a slight temperature decrease, with the average high-temperature shifting from a refreshing 59.5°F (15.3°C) in November to a cool 50.9°F (10.5°C). Mountain Valley's average low-temperature during December nights is observed to be an icy 36.5°F (2.5°C).Humidity
In December, the average relative humidity is 79%.Rainfall
In December, the rain falls for 12.1 days. Throughout December, 3.31" (84mm) of precipitation is accumulated. Throughout the year, there are 161.4 rainfall days, and 38.94" (989mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through March, November and December. In Mountain Valley, during December, snow falls for 0.8 days and regularly aggregates up to 0.35" (9mm) of snow. Throughout the year, there are 6.3 snowfall days, and 2.99" (76mm) of snow is accumulated.Daylight
December has the shortest days of the year, with an average of 9h and 54min of daylight.On the first day of the month, sunrise is at 7:01 am and sunset at 5:01 pm. On the last day of December, sunrise is at 7:19 am and sunset at 5:12 pm CST.
Sunshine
The average sunshine in December is 5.2h.UV index
December is the month with the lowest UV index, with an average maximum UV index of 2. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to Sun's UV rays for the average person.Note: A typical high UV index of 2 in December suggests the following recommendations:
In contrast to children, who must always be shielded from the sun, most people can tolerate up to an hour of sun exposure without any burns. Solar radiation peaks around mid-day, so it's wise to limit exposure to the Sun at this time. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage. Be alert! Nearly double the UV rays from the Sun can be reflected by snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Mountain Valley, AR
- Average high temperature in December: 50.9°F
The warmest month (with the highest average high temperature) is July (91.9°F).
The month with the lowest average high temperature is January (48.7°F).
- Average low temperature in December: 36.5°F
The month with the highest average low temperature is July (70.5°F).
The coldest month (with the lowest average low temperature) is January (33.1°F).
Average pressure in December
Mountain Valley, AR
- Average pressure in December: 30.14"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in December
Mountain Valley, AR
- Average wind speed in December: 6mph
The windiest month (with the highest average wind speed) is April (7.4mph).
The calmest month (with the lowest average wind speed) is August (4.5mph).
Average humidity in December
Mountain Valley, AR
- Average humidity in December: 79%
The month with the highest relative humidity is March (80%).
The month with the lowest relative humidity is October (72%).
Average rainfall in December
Mountain Valley, AR
- Average rainfall in December: 3.31"
The wettest month (with the highest rainfall) is April (4.53").
The driest month (with the least rainfall) is September (2.17").
Average rainfall days in December
Mountain Valley, AR
- Average rainfall days in December: 12.1 days
The month with the highest number of rainy days is July (17.3 days).
The month with the least rainy days is November (10.2 days).
Average snowfall in December
Mountain Valley, AR
- Average snowfall in December: 0.35"
The month with the highest snowfall is February (1.26").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in December
Mountain Valley, AR
- Average snowfall days in December: 0.8 days
The month with the highest number of snowfall days is February (2.5 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
Mountain Valley, AR
- Average daylight in December: 9h and 54min
The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).
- Average sunshine in December: 5h and 12min
The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is February (Average sunshine: 5h and 6min).
Average sunshine days in December
Mountain Valley, AR
- Average sunshine days in December: 17.4 days
The month with the most sunshine days is October (18.5 days).
The month with the least sunshine days is July (11.8 days).
Average UV index in December
Mountain Valley, AR
- Average UV index in December: 2
The months with the highest UV index are June and July (UV index 7).
The month with the lowest UV index is December (UV index 2).
Average cloud cover in December
Mountain Valley, AR
- Average cloud cover in December: 44
The months with the most cloud cover are February and March (Cloud cover 47).
The months with the least cloud cover are June, July, August and September (Cloud cover 29).
Average visibility in December
Mountain Valley, AR
- Average visibility in December: 5mi
The months with the highest visibility are April, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February, March, May and December (5mi).
