December weather forecastStoy, IL
December
Weather in December
The first month of the winter, December, is still a cold month in Stoy, Illinois, with an average temperature varying between 29.7°F (-1.3°C) and 41°F (5°C).Temperature
In December, the average high-temperature goes from a fresh 51.3°F (10.7°C) in November to a cold 41°F (5°C). During December, the average low-temperature is a freezing cold 29.7°F (-1.3°C).Humidity
In Stoy, the average relative humidity in December is 79%.Rainfall
In Stoy, in December, during 9.8 rainfall days, 2.24" (57mm) of precipitation is typically accumulated. Throughout the year, there are 147.2 rainfall days, and 27.87" (708mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through April, November and December. In Stoy, during December, snow falls for 5 days and regularly aggregates up to 1.3" (33mm) of snow. Throughout the year, there are 21.1 snowfall days, and 5.16" (131mm) of snow is accumulated.Daylight
The month with the shortest days is December, with an average of 9h and 30min of daylight.On the first day of December, sunrise is at 6:51 am and sunset at 4:29 pm. On the last day of the month, sunrise is at 7:10 am and sunset at 4:39 pm CST.
Sunshine
In Stoy, the average sunshine in December is 4.4h.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 value of 2, and less, symbolizes a minimal health hazard from unprotected exposure to Sun's UV rays for average individuals.Note: The daily maximum UV index of 2 in December interprets into the following advice:
Many can withstand an hour in the sun without burning, yet children must always have protection against sunlight. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. 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. Keep in mind! Snow's reflective quality 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
Average temperature in December
Stoy, IL
- Average high temperature in December: 41°F
The warmest month (with the highest average high temperature) is July (83.8°F).
The month with the lowest average high temperature is January (36°F).
- Average low temperature in December: 29.7°F
The month with the highest average low temperature is July (66.7°F).
The coldest month (with the lowest average low temperature) is January (23.4°F).
Average pressure in December
Stoy, 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 (29.93"Hg).
Average wind speed in December
Stoy, IL
- Average wind speed in December: 9.2mph
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
Stoy, IL
- Average humidity in December: 79%
The months with the highest relative humidity are July and August (81%).
The month with the lowest relative humidity is October (71%).
Average rainfall in December
Stoy, IL
- Average rainfall in December: 2.24"
The wettest month (with the highest rainfall) is April (4.13").
The driest month (with the least rainfall) is September (1.46").
Average rainfall days in December
Stoy, IL
- Average rainfall days in December: 9.8 days
The month with the highest number of rainy days is May (17.8 days).
The month with the least rainy days is January (8.3 days).
Average snowfall in December
Stoy, IL
- Average snowfall in December: 1.3"
The month with the highest snowfall is January (1.61").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Stoy, IL
- Average snowfall days in December: 5 days
The month with the highest number of snowfall days is January (6 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
Stoy, IL
- Average daylight in December: 9h and 30min
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 24min
The month with the most sunshine is June (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 4h and 12min).
Average sunshine days in December
Stoy, IL
- Average sunshine days in December: 16.6 days
The month with the most sunshine days is October (18.7 days).
The month with the least sunshine days is May (10.8 days).
Average UV index in December
Stoy, 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
Stoy, IL
- Average cloud cover in December: 53
The months with the most cloud cover are January and February (Cloud cover 54).
The month with the least cloud cover is August (Cloud cover 29).
Average visibility in December
Stoy, 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).
