December weather forecastRiver Forest, IN
December
Weather in December
December, the first month of the winter in River Forest, is also an icy month, with temperature in the range of an average high of 38.1°F (3.4°C) and an average low of 27.5°F (-2.5°C).Temperature
With December's onset, the average high-temperature recedes from November's frosty 48.6°F (9.2°C) to an icy 38.1°F (3.4°C). An average minimum temperature of 27.5°F (-2.5°C) is recorded during the month of December.Humidity
January and December, with an average relative humidity of 83%, are the most humid months.Rainfall
In River Forest, in December, during 8.3 rainfall days, 1.46" (37mm) of precipitation is typically accumulated. In River Forest, during the entire year, the rain falls for 142.1 days and collects up to 20.91" (531mm) of precipitation.Snowfall
Months with snowfall are January through April, October through December. The months with the most snowfall are February and December, with an average 2.17" (55mm) of accumulated snow.Daylight
The month with the shortest days is December, with an average of 9h and 24min of daylight.On the first day of December, sunrise is at 7:46 am and sunset at 5:17 pm. On the last day of the month, sunrise is at 8:04 am and sunset at 5:27 pm EST.
Sunshine
In December, the average sunshine is 4.1h.UV index
The months with the lowest UV index are January, February, October through December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV rays for ordinary individuals.Note: In December, the maximum UV index of 2 suggests this advice:
While most individuals can withstand prolonged sun exposure, it is imperative that babies, children, and those with sensitive skin always be shielded. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. Enhance your sun protection with tightly woven, yet airy clothing. Be careful! The Sun's UV radiation can nearly be doubled by the reflective quality of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
River Forest, IN
- Average high temperature in December: 38.1°F
The warmest month (with the highest average high temperature) is July (81.3°F).
The month with the lowest average high temperature is January (32.2°F).
- Average low temperature in December: 27.5°F
The month with the highest average low temperature is July (64.8°F).
The coldest month (with the lowest average low temperature) is January (20.5°F).
Average pressure in December
River Forest, IN
- Average pressure in December: 30.11"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in December
River Forest, IN
- Average wind speed in December: 9.5mph
The windiest month (with the highest average wind speed) is January (10.3mph).
The calmest month (with the lowest average wind speed) is August (5.9mph).
Average humidity in December
River Forest, IN
- Average humidity in December: 83%
The months with the highest relative humidity are January and December (83%).
The month with the lowest relative humidity is October (74%).
Average rainfall in December
River Forest, IN
- Average rainfall in December: 1.46"
The wettest month (with the highest rainfall) is May (2.68").
The driest months (with the least rainfall) are February and November (1.14").
Average rainfall days in December
River Forest, IN
- Average rainfall days in December: 8.3 days
The month with the highest number of rainy days is May (17.6 days).
The month with the least rainy days is February (6.1 days).
Average snowfall in December
River Forest, IN
- Average snowfall in December: 2.17"
The months with the highest snowfall are February and December (2.17").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
River Forest, IN
- Average snowfall days in December: 7.7 days
The month with the highest number of snowfall days is January (10.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
River Forest, IN
- Average daylight in December: 9h and 24min
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 6min
The month with the most sunshine is June (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in December
River Forest, IN
- Average sunshine days in December: 15.9 days
The month with the most sunshine days is November (18.5 days).
The month with the least sunshine days is May (10.7 days).
Average UV index in December
River Forest, IN
- 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, October, November and December (UV index 2).
Average cloud cover in December
River Forest, IN
- Average cloud cover in December: 58
The month with the most cloud cover is January (Cloud cover 62).
The months with the least cloud cover are June, July and August (Cloud cover 32).
Average visibility in December
River Forest, IN
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, September, October, November and December (6mi).
The month with the lowest visibility is August (5mi).
