December weather forecastGroveland, IL
December
Weather in December
The first month of the winter, December, is still a cold month in Groveland, Illinois, with an average temperature varying between 26.2°F (-3.2°C) and 36.5°F (2.5°C).Temperature
The start of December comes with a reduction in the average high-temperature, receding from a chilly 48.4°F (9.1°C) in November to an icy 36.5°F (2.5°C). During December, Groveland records a consistent average nighttime temperature of 26.2°F (-3.2°C).Humidity
The average relative humidity in December in Groveland, Illinois, is 80%.Rainfall
February and December are months with the least rain in Groveland when the rain falls for 6 days and typically aggregates up to 0.83" (21mm) of rain.Snowfall
January through April, November and December are months with snowfall in Groveland. In Groveland, during December, snow falls for 6 days and regularly aggregates up to 1.02" (26mm) of snow. In Groveland, Illinois, during the entire year, snow falls for 27.6 days and aggregates up to 6.46" (164mm) of snow.Daylight
December has the shortest days of the year in Groveland, with an average of 9h and 18min of daylight.On the first day of the month, sunrise is at 7:03 am and sunset at 4:31 pm. On the last day of December, sunrise is at 7:21 am and sunset at 4:41 pm CST.
Sunshine
The average sunshine in December in Groveland, Illinois, 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 reading of 2, and below, represents a minimal health hazard from exposure to the Sun's UV rays for the average person.Note: The daily maximum UV index of 2 in December interprets into the following advice:
Although the majority can endure up to an hour in the sun without burns, children always require sun protection. During midday, the Sun's radiation is strongest, and it's advisable to reduce direct exposure. Loose clothes with a tight weave are optimal for safeguarding yourself against the Sun's rays. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Groveland, IL
- Average high temperature in December: 36.5°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 (31.1°F).
- Average low temperature in December: 26.2°F
The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (18.9°F).
Average pressure in December
Groveland, IL
- Average pressure in December: 30.11"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in December
Groveland, IL
- Average wind speed in December: 9.9mph
The windiest month (with the highest average wind speed) is April (10.6mph).
The calmest month (with the lowest average wind speed) is August (6.5mph).
Average humidity in December
Groveland, IL
- Average humidity in December: 80%
The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is October (71%).
Average rainfall in December
Groveland, IL
- Average rainfall in December: 0.83"
The wettest month (with the highest rainfall) is May (2.48").
The driest months (with the least rainfall) are February and December (0.83").
Average rainfall days in December
Groveland, IL
- Average rainfall days in December: 6 days
The month with the highest number of rainy days is May (17.2 days).
The month with the least rainy days is February (4.8 days).
Average snowfall in December
Groveland, IL
- Average snowfall in December: 1.02"
The month with the highest snowfall is January (2.24").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Groveland, IL
- Average snowfall days in December: 6 days
The month with the highest number of snowfall days is January (8.7 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Groveland, IL
- Average daylight in December: 9h and 18min
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 18min).
- Average sunshine in December: 4h and 24min
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
Groveland, IL
- Average sunshine days in December: 19.7 days
The month with the most sunshine days is December (19.7 days).
The month with the least sunshine days is May (11.4 days).
Average UV index in December
Groveland, IL
- Average UV index in December: 2
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in December
Groveland, IL
- Average cloud cover in December: 53
The month with the most cloud cover is January (Cloud cover 58).
The month with the least cloud cover is September (Cloud cover 30).
Average visibility in December
Groveland, 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).
