December weather forecastMount Vernon, MO
December
Weather in December
December, the first month of the winter in Mount Vernon, is also a frosty month, with an average temperature ranging between max 45.5°F (7.5°C) and min 30.7°F (-0.7°C).Temperature
During the transition into December, Mount Vernon observes a decrease in the average high-temperature, falling from a fresh 55.2°F (12.9°C) in November to a frosty 45.5°F (7.5°C). In Mount Vernon, the December nights cool down to an average low of 30.7°F (-0.7°C).Humidity
The average relative humidity in December is 75%.Rainfall
In Mount Vernon, during December, the rain falls for 7.8 days and regularly aggregates up to 1.81" (46mm) of precipitation. In Mount Vernon, Missouri, during the entire year, the rain falls for 155.3 days and collects up to 35.59" (904mm) of precipitation.Snowfall
January through May, November and December are months with snowfall. In Mount Vernon, in December, during 3 snowfall days, 0.83" (21mm) of snow is typically accumulated. In Mount Vernon, during the entire year, snow falls for 17.9 days and aggregates up to 6.93" (176mm) of snow.Daylight
With an average of 9h and 42min of daylight, December has the shortest days of the year.On the first day of December, sunrise is at 7:10 am and sunset at 4:58 pm. On the last day of the month, sunrise is at 7:28 am and sunset at 5:08 pm CST.
Sunshine
In Mount Vernon, the average sunshine in December is 5.5h.UV index
January and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index of 2, and less, symbolizes a low threat to health from unprotected exposure to Sun's UV rays for average individuals.Note: A daily high UV index of 2 in December leads to these guidelines:
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. Direct Sun exposure should be minimized especially during midday when radiation is most intense. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes. Be watchful! The reflection of snow can enhance the intensity of the Sun's UV radiation nearly double.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Mount Vernon, MO
- Average high temperature in December: 45.5°F
The warmest month (with the highest average high temperature) is July (88.7°F).
The month with the lowest average high temperature is January (42.3°F).
- Average low temperature in December: 30.7°F
The month with the highest average low temperature is July (68.9°F).
The coldest month (with the lowest average low temperature) is January (26.6°F).
Average pressure in December
Mount Vernon, MO
- Average pressure in December: 30.14"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The months with the lowest atmospheric pressure are April and June (29.93"Hg).
Average wind speed in December
Mount Vernon, MO
- Average wind speed in December: 9.3mph
The windiest months (with the highest average wind speed) are March and April (10.3mph).
The calmest month (with the lowest average wind speed) is July (6.6mph).
Average humidity in December
Mount Vernon, MO
- Average humidity in December: 75%
The month with the highest relative humidity is May (78%).
The months with the lowest relative humidity are January, July, August and October (73%).
Average rainfall in December
Mount Vernon, MO
- Average rainfall in December: 1.81"
The wettest month (with the highest rainfall) is May (5.31").
The driest month (with the least rainfall) is February (1.69").
Average rainfall days in December
Mount Vernon, MO
- Average rainfall days in December: 7.8 days
The month with the highest number of rainy days is May (17.8 days).
The month with the least rainy days is January (7.3 days).
Average snowfall in December
Mount Vernon, MO
- Average snowfall in December: 0.83"
The month with the highest snowfall is February (2.24").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days in December
Mount Vernon, MO
- Average snowfall days in December: 3 days
The month with the highest number of snowfall days is February (5.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Mount Vernon, MO
- Average daylight in December: 9h and 42min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 42min).
- Average sunshine in December: 5h and 30min
The month with the most sunshine is June (Average sunshine: 10h and 42min).
The month with the least sunshine is January (Average sunshine: 5h and 18min).
Average sunshine days in December
Mount Vernon, MO
- Average sunshine days in December: 20.7 days
The month with the most sunshine days is December (20.7 days).
The month with the least sunshine days is July (10.6 days).
Average UV index in December
Mount Vernon, MO
- Average UV index in December: 2
The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January and December (UV index 2).
Average cloud cover in December
Mount Vernon, MO
- Average cloud cover in December: 42
The month with the most cloud cover is March (Cloud cover 47).
The month with the least cloud cover is August (Cloud cover 26).
Average visibility in December
Mount Vernon, MO
- 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).
