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
December weather is marked by a drop in the average high-temperature, falling from a cool 52.9°F (11.6°C) in November to a frosty 43.2°F (6.2°C). West Salem, during the nights of December, experiences an average temperature drop to a freezing cold 31.3°F (-0.4°C).Humidity
In December, the average relative humidity 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
Months with snowfall in West Salem are January through March, November and December. In West Salem, in December, during 2 snowfall days, 0.28" (7mm) of snow is typically accumulated. In West Salem, Illinois, during the entire year, snow falls for 12.4 days and aggregates up to 1.38" (35mm) of snow.Daylight
With an average of 9h and 30min of daylight, December has the shortest days of the year.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, in West Salem, sunrise is at 7:09 am and sunset at 4:41 pm CST.
Sunshine
In West Salem, the average sunshine in December is 4.6h.UV index
The months with the lowest UV index 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 exposure to the Sun's UV radiation for ordinary individuals.Note: In December, an average UV index of 2 transforms into the following instructions:
While most people are not greatly affected by extended sun exposure, those with fair skin, babies, and children must always have protection. Minimize direct exposure to the Sun during midday when its radiation is at its peak. Boost your sun resistance with garments that are densely woven yet spacious. Mind this! Nearly twice the UV radiation from the Sun can be reflected by the snow.
Frequently asked questions
How cold does it get in West Salem in December?
What is the average humidity in December in West Salem?
How many days does it rain in December in West Salem?
How much does it snow in West Salem in December?
What is the month with the shortest days in West Salem?
What is the average length of the day in December in West Salem?
What time are sunrise and sunset in December in West Salem?
How long on average sun shines in December in West Salem?
What are the months with the lowest UV index in West Salem?
What is the UV index intensity in December in West Salem?
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 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 4min
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).
West Salem, Illinois, USA
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