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 onset of December is marked by a decrease in temperature, transitioning from a fresh 51.8°F (11°C) in November to a wintry 40.6°F (4.8°C). Jerseyville's average low-temperature in December is measured at a freezing cold 29.3°F (-1.5°C).Humidity
The average relative humidity in December in Jerseyville is 77%.Rainfall
In Jerseyville, in December, it is raining for 7.5 days, with typically 1.3" (33mm) of accumulated precipitation. In Jerseyville, Illinois, during the entire year, the rain falls for 136.5 days and collects up to 23.11" (587mm) of precipitation.Snowfall
January through March, November and December are months with snowfall. In December, it is snowing for 4.4 days. Throughout December, 1.18" (30mm) of snow is accumulated. In Jerseyville, Illinois, during the entire year, snow falls for 20.9 days and aggregates up to 6.26" (159mm) of snow.Daylight
December has the shortest days of the year, with an average of 9h and 30min of daylight.On the first day of December, sunrise is at 7:02 am and sunset at 4:39 pm. On the last day of the month, sunrise is at 7:20 am and sunset at 4:48 pm CST.
Sunshine
In December, the average sunshine in Jerseyville is 4.9h.UV index
The months with the lowest UV index in Jerseyville are January, February, November and December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a minimal health hazard from unsafe exposure to UV radiation for average individuals.Note: In December, a daily maximum UV index of 2 leads to the following instructions:
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. When the Sun's UV radiation is most intense during midday, it's best to find shade and limit exposure. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is December in Jerseyville?
What is the average humidity in December in Jerseyville?
How many days does it rain in December in Jerseyville?
How much does it snow in Jerseyville in December?
What is the month with the shortest days in Jerseyville?
How many hours of daylight does Jerseyville have in December?
When are sunrise and sunset in December in Jerseyville?
How long on average sun shines in December in Jerseyville?
When is the lowest UV index in Jerseyville?
What is the UV index reading in December in Jerseyville?
Average temperature in December
Jerseyville, IL
- Average high temperature in December: 40.6°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 (35.6°F).
- Average low temperature in December: 29.3°F
The month with the highest average low temperature is July (67.6°F).
The coldest month (with the lowest average low temperature) is January (22.6°F).
Average pressure in December
Jerseyville, IL
- Average pressure in December: 30.13"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in December
Jerseyville, IL
- Average wind speed in December: 9.1mph
The windiest months (with the highest average wind speed) are January and February (9.6mph).
The calmest month (with the lowest average wind speed) is July (5.7mph).
Average humidity in December
Jerseyville, IL
- Average humidity in December: 77%
The month with the highest relative humidity is July (80%).
The month with the lowest relative humidity is October (71%).
Average rainfall in December
Jerseyville, IL
- Average rainfall in December: 1.3"
The wettest month (with the highest rainfall) is June (3.07").
The driest month (with the least rainfall) is January (1.06").
Average rainfall days in December
Jerseyville, IL
- Average rainfall days in December: 7.5 days
The month with the highest number of rainy days is May (16.5 days).
The month with the least rainy days is January (5.9 days).
Average snowfall in December
Jerseyville, IL
- Average snowfall in December: 1.18"
The month with the highest snowfall is February (2.17").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in December
Jerseyville, IL
- Average snowfall days in December: 4.4 days
The month with the highest number of snowfall days is January (6.2 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Jerseyville, IL
- Average daylight in December: 9h and 3min
The month with the longest days is June (Average daylight: 14h and 54min).
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 24min).
The month with the least sunshine is January (Average sunshine: 4h and 30min).
Average sunshine days in December
Jerseyville, IL
- Average sunshine days in December: 19.4 days
The month with the most sunshine days is January (20.3 days).
The months with the least sunshine days are May and June (12.3 days).
Average UV index in December
Jerseyville, IL
- 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, February, November and December (UV index 2).
Average cloud cover in December
Jerseyville, IL
- Average cloud cover in December: 48
The month with the most cloud cover is January (Cloud cover 51).
The months with the least cloud cover are August and September (Cloud cover 28).
Average visibility in December
Jerseyville, 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).
Jerseyville, Illinois, USA
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