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
The arrival of December indicates a decrease in the average high-temperature, moving from a frosty 49.3°F (9.6°C) in November to a cold 38.1°F (3.4°C). The average temperature drops to a freezing cold 27.5°F (-2.5°C) during the night in the month of December.Humidity
In December, the average relative humidity in Forsyth is 79%.Rainfall
The month with the least rainfall is December, when the rain falls for 8.1 days and typically collects 1.06" (27mm) of precipitation.Snowfall
January through April, November and December are months with snowfall. In Forsyth, in December, during 7.1 snowfall days, 1.14" (29mm) of snow is typically accumulated. Throughout the year, there are 30.3 snowfall days, and 6.89" (175mm) of snow is accumulated.Daylight
December has the shortest days of the year, with an average of 9h and 24min of daylight.On the first day of the month, sunrise is at 6:58 am and sunset at 4:31 pm. On the last day of December, in Forsyth, sunrise is at 7:17 am and sunset at 4:40 pm CST.
Sunshine
The average sunshine in December is 4.4h.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 unprotected exposure to Sun's UV rays for average individuals.Note: A typical high UV index of 2 in December suggests the following recommendations:
Long-term sun exposure is typically not a concern for most. However, those with sensitive skin, infants, and children must always have protection. Considering the Sun's intensity during midday, it's wise to minimize direct exposure. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear. Take precaution! The reflection from snow can almost double the UV radiation of the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold does it get in December?
What is the average humidity in December?
What is the driest month?
How many days does it rain in December?
How much does it snow in December?
What is the month with the shortest days in Forsyth?
How many hours of daylight does Forsyth have in December?
When is the sunrise / sunset in December?
How long on average sun shines in December?
What is the month with the lowest UV index in Forsyth?
What is the UV index intensity in December?
Average temperature in December
Forsyth, IL
- Average high temperature in December: 38.1°F
The warmest month (with the highest average high temperature) is July (81.9°F).
The month with the lowest average high temperature is January (32.4°F).
- Average low temperature in December: 27.5°F
The month with the highest average low temperature is July (65.3°F).
The coldest month (with the lowest average low temperature) is January (20.1°F).
Average pressure in December
Forsyth, IL
- Average pressure in December: 30.12"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in December
Forsyth, IL
- Average wind speed in December: 10.1mph
The windiest months (with the highest average wind speed) are January, February and April (10.7mph).
The calmest month (with the lowest average wind speed) is August (6.4mph).
Average humidity in December
Forsyth, IL
- Average humidity in December: 79%
The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is October (70%).
Average rainfall in December
Forsyth, IL
- Average rainfall in December: 1.06"
The wettest month (with the highest rainfall) is May (2.52").
The driest month (with the least rainfall) is December (1.06").
Average rainfall days in December
Forsyth, IL
- Average rainfall days in December: 8.1 days
The month with the highest number of rainy days is May (17.2 days).
The month with the least rainy days is January (6.2 days).
Average snowfall in December
Forsyth, IL
- Average snowfall in December: 1.14"
The month with the highest snowfall is January (2.13").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Forsyth, IL
- Average snowfall days in December: 7.1 days
The month with the highest number of snowfall days is January (9.3 days).
The months with the least snowfall days are May, June, July and August (0 days).
Average daylight in December /
Average sunshine in December
Forsyth, IL
- Average daylight in December: 9h and 2min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in December: 4h and 2min
The month with the most sunshine is June (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).
Average sunshine days in December
Forsyth, IL
- Average sunshine days in December: 16.7 days
The month with the most sunshine days is November (18.8 days).
The month with the least sunshine days is July (10.3 days).
Average UV index in December
Forsyth, IL
- Average UV index in December: 2
The months with the highest UV index are 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
Forsyth, IL
- Average cloud cover in December: 54
The month with the most cloud cover is January (Cloud cover 58).
The month with the least cloud cover is September (Cloud cover 31).
Average visibility in December
Forsyth, IL
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are July and August (5mi).
Forsyth, Illinois, USA
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