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
The transition into December involves a decrease in the average high-temperature, falling from a cool 52.2°F (11.2°C) in November to a cold 41.9°F (5.5°C). The average temperature during December nights dips to a freezing cold 30.6°F (-0.8°C).Humidity
In Vernon, the average relative humidity in December is 78%.Rainfall
In Vernon, during December, the rain falls for 8.7 days and regularly aggregates up to 1.85" (47mm) of precipitation. Throughout the year, there are 145.5 rainfall days, and 28.39" (721mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through April, November and December. In December, in Vernon, it is snowing for 3.6 days. Throughout December, 1.06" (27mm) of snow is accumulated. In Vernon, during the entire year, snow falls for 17.7 days and aggregates up to 5.91" (150mm) of snow.Daylight
The month with the shortest days is December, with an average of 9h and 30min of daylight.On the first day of the month, sunrise is at 6:56 am and sunset at 4:34 pm. On the last day of December, sunrise is at 7:14 am and sunset at 4:44 pm CST.
Sunshine
The average sunshine in December in Vernon is 4.8h.UV index
January, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Vernon. A UV Index of 2, and less, symbolizes a low health risk from unsafe exposure to UV radiation for ordinary individuals.Note: In December, the UV index of 2 transforms into the following advice:
Apart from children, who require continuous protection, most can endure sun exposure for up to an hour without experiencing burns. The Sun's most harmful UV rays are emitted around midday; avoid staying outdoors for long during this time. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun. Attention! Nearly twice the Sun's UV radiation can be reflected by snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold does it get in December?
What is the average humidity in December?
How much does it rain in December?
How many days does it snow in December?
What is the month with the shortest days in Vernon?
What is the average length of the day in December in Vernon?
What time are sunrise and sunset in December?
How many hours of sunshine does Vernon have in December?
What are the months with the lowest UV index?
What is the UV index intensity in December?
Average temperature in December
Vernon, IL
- Average high temperature in December: 41.9°F
The warmest month (with the highest average high temperature) is July (84.7°F).
The month with the lowest average high temperature is January (37°F).
- Average low temperature in December: 30.6°F
The month with the highest average low temperature is July (67.5°F).
The coldest month (with the lowest average low temperature) is January (24.3°F).
Average pressure in December
Vernon, IL
- 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 (29.93"Hg).
Average wind speed in December
Vernon, IL
- Average wind speed in December: 9.2mph
The windiest months (with the highest average wind speed) are January and February (10mph).
The calmest month (with the lowest average wind speed) is July (5.8mph).
Average humidity in December
Vernon, IL
- Average humidity in December: 78%
The months with the highest relative humidity are May, July and August (80%).
The month with the lowest relative humidity is October (71%).
Average rainfall in December
Vernon, IL
- Average rainfall in December: 1.85"
The wettest month (with the highest rainfall) is June (3.43").
The driest month (with the least rainfall) is February (1.46").
Average rainfall days in December
Vernon, IL
- Average rainfall days in December: 8.7 days
The month with the highest number of rainy days is May (16.7 days).
The month with the least rainy days is January (7.2 days).
Average snowfall in December
Vernon, IL
- Average snowfall in December: 1.06"
The month with the highest snowfall is January (1.77").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Vernon, IL
- Average snowfall days in December: 3.6 days
The month with the highest number of snowfall days is January (5.8 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
Vernon, IL
- Average daylight in December: 9h and 3min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in December: 4h and 5min
The month with the most sunshine is June (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 4h and 30min).
Average sunshine days in December
Vernon, IL
- Average sunshine days in December: 19.1 days
The month with the most sunshine days is October (19.5 days).
The month with the least sunshine days is May (11.5 days).
Average UV index in December
Vernon, IL
- Average UV index in December: 2
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, November and December (UV index 2).
Average cloud cover in December
Vernon, IL
- Average cloud cover in December: 49
The months with the most cloud cover are January and February (Cloud cover 51).
The months with the least cloud cover are June and August (Cloud cover 28).
Average visibility in December
Vernon, IL
- 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).
Vernon, Illinois, USA
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