December weather forecastMount Morris, IL
December
Weather in December
December, the first month of the winter in Mount Morris, is also an icy month, with an average temperature varying between 32.4°F (0.2°C) and 22.3°F (-5.4°C).Temperature
December implies a gentle temperature shift, with average high-temperatures reducing from November's chilly 44.8°F (7.1°C) to a cold 32.4°F (0.2°C). The average low-temperature in Mount Morris, Illinois, during December nights is a freezing cold 22.3°F (-5.4°C).Humidity
The average relative humidity in December in Mount Morris, Illinois, is 83%.Rainfall
In December, in Mount Morris, the rain falls for 7.5 days. Throughout December, 1.69" (43mm) of precipitation is accumulated. Throughout the year, in Mount Morris, there are 154.8 rainfall days, and 32.36" (822mm) of precipitation is accumulated.Snowfall
January through May, October through December are months with snowfall in Mount Morris. In December, in Mount Morris, it is snowing for 9.5 days. Throughout December, 3.19" (81mm) of snow is accumulated. Throughout the year, in Mount Morris, there are 45.5 snowfall days, and 19.25" (489mm) of snow is accumulated.Daylight
The month with the shortest days is December, with an average of 9h and 12min of daylight.On the first day of the month, sunrise is at 7:07 am and sunset at 4:27 pm. On the last day of December, in Mount Morris, sunrise is at 7:25 am and sunset at 4:36 pm CST.
Sunshine
In December, the average sunshine is 3.9h.UV index
January and December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to Sun's UV rays for the average person.Note: The daily high UV index of 1 during December translates into the following recommendations:
Extended exposure to the sun should always be avoided by children, infants, and those with sensitive skin. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. Enhance your sun protection with tightly woven, yet airy clothing. Note this! The Sun's UV radiation can nearly be doubled by the reflection off snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Mount Morris, IL
- Average high temperature in December: 32.4°F
The warmest month (with the highest average high temperature) is July (79.9°F).
The month with the lowest average high temperature is January (26.1°F).
- Average low temperature in December: 22.3°F
The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is January (13.8°F).
Average pressure in December
Mount Morris, IL
- Average pressure in December: 30.1"Hg
The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in December
Mount Morris, IL
- Average wind speed in December: 9.4mph
The windiest month (with the highest average wind speed) is April (10.3mph).
The calmest month (with the lowest average wind speed) is August (6.4mph).
Average humidity in December
Mount Morris, IL
- Average humidity in December: 83%
The month with the highest relative humidity is January (86%).
The months with the lowest relative humidity are April and October (75%).
Average rainfall in December
Mount Morris, IL
- Average rainfall in December: 1.69"
The wettest month (with the highest rainfall) is May (4.53").
The driest month (with the least rainfall) is February (1.57").
Average rainfall days in December
Mount Morris, IL
- Average rainfall days in December: 7.5 days
The month with the highest number of rainy days is May (19.1 days).
The month with the least rainy days is February (5.3 days).
Average snowfall in December
Mount Morris, IL
- Average snowfall in December: 3.19"
The month with the highest snowfall is January (5.79").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Mount Morris, IL
- Average snowfall days in December: 9.5 days
The month with the highest number of snowfall days is January (12.1 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 Morris, IL
- Average daylight in December: 9h and 12min
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: 3h and 54min
The month with the most sunshine is July (Average sunshine: 9h and 30min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).
Average sunshine days in December
Mount Morris, IL
- Average sunshine days in December: 15.6 days
The month with the most sunshine days is November (17 days).
The month with the least sunshine days is June (9.2 days).
Average UV index in December
Mount Morris, IL
- Average UV index in December: 1
The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in December
Mount Morris, IL
- Average cloud cover in December: 60
The month with the most cloud cover is January (Cloud cover 63).
The month with the least cloud cover is September (Cloud cover 34).
Average visibility in December
Mount Morris, IL
- Average visibility in December: 6mi
The months with the highest visibility are March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are January, February, July and August (5mi).
