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's arrival coincides with a drop in the average high-temperature, decreasing from November's chilly 45.5°F (7.5°C) to a cold 34.7°F (1.5°C). Throughout December, the average low-temperature in Mount Prospect, Illinois, records at a freezing cold 25°F (-3.9°C).Humidity
The average relative humidity in December is 80%.Rainfall
The month with the least rainfall in Mount Prospect, Illinois, is December, when the rain falls for 8.5 days and typically collects 1.46" (37mm) of precipitation.Snowfall
Months with snowfall are January through May, October through December. In Mount Prospect, Illinois, during December, snow falls for 9.5 days and regularly aggregates up to 2.52" (64mm) of snow. Throughout the year, there are 43.6 snowfall days, and 17.95" (456mm) of snow is accumulated.Daylight
December has the shortest days of the year in Mount Prospect, with an average of 9h and 12min of daylight.On the first day of December, sunrise is at 7:01 am and sunset at 4:21 pm. On the last day of the month, sunrise is at 7:19 am and sunset at 4:30 pm CST.
Sunshine
In December, the average sunshine is 4h.UV index
The month with the lowest UV index is December, with an average maximum UV index of 1. A UV Index estimate of 2, and below, represents a low threat to health from exposure to the Sun's UV radiation for the average person.Note: The UV index of 1 during December leads to these advisories:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to be protected. To protect against the Sun's most potent rays, avoid direct exposure around midday. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Take to heart! Snow reflection can almost magnify the Sun's UV radiation twofold.
Frequently asked questions
How cold is December in Mount Prospect?
What is the average humidity in December in Mount Prospect?
What is the driest month in Mount Prospect?
How much does it rain in Mount Prospect in December?
How much does it snow in Mount Prospect in December?
What is the month with the shortest days in Mount Prospect?
What is the average length of the day in December in Mount Prospect?
When is the sunrise / sunset in December in Mount Prospect?
How long on average sun shines in December in Mount Prospect?
What is the month with the lowest UV index in Mount Prospect?
What is the UV index intensity in December in Mount Prospect?
Average temperature in December
Mount Prospect, IL
- Average high temperature in December: 34.7°F
The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (28.2°F).
- Average low temperature in December: 25°F
The month with the highest average low temperature is July (66.4°F).
The coldest month (with the lowest average low temperature) is January (18°F).
Average pressure in December
Mount Prospect, IL
- Average pressure in December: 30.09"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in December
Mount Prospect, IL
- Average wind speed in December: 9.7mph
The windiest month (with the highest average wind speed) is January (10.4mph).
The calmest month (with the lowest average wind speed) is August (6.5mph).
Average humidity in December
Mount Prospect, IL
- Average humidity in December: 80%
The months with the highest relative humidity are January and February (82%).
The month with the lowest relative humidity is October (72%).
Average rainfall in December
Mount Prospect, IL
- Average rainfall in December: 1.46"
The wettest month (with the highest rainfall) is May (3.9").
The driest month (with the least rainfall) is December (1.46").
Average rainfall days in December
Mount Prospect, IL
- Average rainfall days in December: 8.5 days
The month with the highest number of rainy days is May (18 days).
The month with the least rainy days is February (5.6 days).
Average snowfall in December
Mount Prospect, IL
- Average snowfall in December: 2.52"
The month with the highest snowfall is January (4.96").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Mount Prospect, IL
- Average snowfall days in December: 9.5 days
The month with the highest number of snowfall days is January (11.8 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 Prospect, IL
- Average daylight in December: 9h and 1min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in December: 4h and 0min
The month with the most sunshine is July (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in December
Mount Prospect, IL
- Average sunshine days in December: 15.7 days
The month with the most sunshine days is November (16.3 days).
The month with the least sunshine days is June (10.7 days).
Average UV index in December
Mount Prospect, IL
- Average UV index in December: 1
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in December
Mount Prospect, IL
- Average cloud cover in December: 59
The month with the most cloud cover is January (Cloud cover 61).
The month with the least cloud cover is August (Cloud cover 29).
Average visibility in December
Mount Prospect, 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).
Mount Prospect, Illinois, USA
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