December weather forecastWest Salem, IL
December
Weather in December
The first month of the winter, December, is still a chilly month in West Salem, Illinois, with an average temperature fluctuating between 31.3°F (-0.4°C) and 43.2°F (6.2°C).Temperature
West Salem's weather in December involves a decrease in the average high-temperature, moving down from November's cool 52.9°F (11.6°C) to a frosty 43.2°F (6.2°C). In the month of December, the nighttime temperature dips to a steady average of 31.3°F (-0.4°C).Humidity
In West Salem, the average relative humidity in December is 78%.Rainfall
In West Salem, in December, it is raining for 6.6 days, with typically 0.75" (19mm) of accumulated precipitation. Throughout the year, there are 109.3 rainfall days, and 10.83" (275mm) of precipitation is accumulated.Snowfall
January through March, November and December are months with snowfall. In West Salem, during December, snow falls for 2 days and regularly aggregates up to 0.28" (7mm) of snow. In West Salem, during the entire year, snow falls for 12.4 days and aggregates up to 1.38" (35mm) 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 6:51 am and sunset at 4:31 pm. On the last day of December, sunrise is at 7:09 am and sunset at 4:41 pm CST.
Sunshine
In December, the average sunshine is 4.6h.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index reading of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV radiation for the ordinary person.Note: In December, the maximum UV index of 2 transforms into these recommendations:
Although the majority can endure up to an hour in the sun without burns, children always require sun protection. Avoiding the Sun's peak radiation during midday hours is essential for health and safety. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades. Notice! The UV radiation of the Sun can be intensified nearly twofold due to the reflective quality of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
West Salem, IL
- Average high temperature in December: 43.2°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 (37.8°F).
- Average low temperature in December: 31.3°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 (25°F).
Average pressure in December
West Salem, IL
- Average pressure in December: 30.14"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in December
West Salem, IL
- Average wind speed in December: 9.4mph
The windiest months (with the highest average wind speed) are January and February (10.1mph).
The calmest month (with the lowest average wind speed) is July (5.9mph).
Average humidity in December
West Salem, IL
- Average humidity in December: 78%
The month with the highest relative humidity is July (80%).
The month with the lowest relative humidity is October (70%).
Average rainfall in December
West Salem, IL
- Average rainfall in December: 0.75"
The wettest month (with the highest rainfall) is April (1.3").
The driest month (with the least rainfall) is September (0.47").
Average rainfall days in December
West Salem, IL
- Average rainfall days in December: 6.6 days
The month with the highest number of rainy days is May (14 days).
The month with the least rainy days is January (5.1 days).
Average snowfall in December
West Salem, IL
- Average snowfall in December: 0.28"
The month with the highest snowfall is January (0.39").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in December
West Salem, IL
- Average snowfall days in December: 2 days
The month with the highest number of snowfall days is January (3.8 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
West Salem, IL
- Average daylight in December: 9h and 30min
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 36min
The month with the most sunshine is June (Average sunshine: 10h and 36min).
The month with the least sunshine is January (Average sunshine: 4h and 24min).
Average sunshine days in December
West Salem, IL
- Average sunshine days in December: 22.4 days
The month with the most sunshine days is October (23.2 days).
The months with the least sunshine days are May and June (14.3 days).
Average UV index in December
West Salem, 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
West Salem, IL
- Average cloud cover in December: 50
The month with the most cloud cover is January (Cloud cover 52).
The month with the least cloud cover is June (Cloud cover 27).
Average visibility in December
West Salem, 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).
