Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall in December
- Average snowfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
A subtle decrease in the average high-temperature marks December, falling from November's fresh 55.2°F (12.9°C) to a frosty 45.5°F (7.5°C). In December, Mount Vernon experiences a temperature dip to an average of 30.7°F (-0.7°C) at night.Humidity
The average relative humidity in December is 75%.Rainfall
In December, in Mount Vernon, Missouri, the rain falls for 7.8 days. Throughout December, 1.81" (46mm) of precipitation is accumulated. In Mount Vernon, 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 Mount Vernon, in December, snow falls for 3 days, with typically accumulated 0.83" (21mm) of snow. Throughout the year, there are 17.9 snowfall days, and 6.93" (176mm) of snow is accumulated.Daylight
December has the shortest days of the year in Mount Vernon, with an average of 9h and 42min of daylight.On the first day of December in Mount Vernon, 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
The months with the lowest UV index in Mount Vernon are January and December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a low threat to health from unsafe exposure to UV radiation for ordinary individuals.Note: The UV index of 2 in December translates into these instructions:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. Stay safe from the Sun's strongest UV rays by limiting exposure during midday. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes. Be aware! The intensity of the Sun's UV radiation can be amplified nearly twice due to snow reflection.
Frequently asked questions
What are the temperatures in Mount Vernon in December?
What is the average humidity in December in Mount Vernon?
How much does it rain in Mount Vernon in December?
How many days does it snow in December in Mount Vernon?
What is the month with the shortest days in Mount Vernon?
How many hours of daylight does Mount Vernon have in December?
What time are sunrise and sunset in December in Mount Vernon?
How long on average sun shines in December in Mount Vernon?
When is the lowest UV index in Mount Vernon?
What is the UV index reading in December in Mount Vernon?
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 4min
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 3min
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).
Mount Vernon, Missouri, USA
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