December weather forecastExeter, IL
December
Weather in December
The first month of the winter, December, is still a cold month in Exeter, Illinois, with an average temperature ranging between max 39.2°F (4°C) and min 27.9°F (-2.3°C).Temperature
December brings a drop in Exeter's average high-temperature, falling from a fresh 51.1°F (10.6°C) in November to a wintry 39.2°F (4°C). Exeter, in December, witnesses an average low-temperature of 27.9°F (-2.3°C).Humidity
In December, the average relative humidity is 77%.Rainfall
The months with the least rainfall are January, February and December Rain falls for 8.1 days and accumulates 1.73" (44mm) of rain.Snowfall
Months with snowfall in Exeter are January through April, October through December. In Exeter, in December, during 5.9 snowfall days, 1.54" (39mm) of snow is typically accumulated. Throughout the year, in Exeter, there are 30.2 snowfall days, and 10.75" (273mm) 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 7:04 am and sunset at 4:38 pm. On the last day of December, in Exeter, sunrise is at 7:22 am and sunset at 4:47 pm CST.
Sunshine
In Exeter, Illinois, the average sunshine in December is 4.8h.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 of 2, and less, symbolizes a low threat to health from unprotected exposure to Sun's UV rays for average individuals.Note: A daily high UV index of 2 in December leads to these guidelines:
Children, infants, and individuals with sensitive skin should be constantly protected from extended sun exposure. Exposing oneself to the midday Sun can be harmful due to the strong UV radiation; limit your time outside. Boost your sun resistance with garments that are densely woven yet spacious. Heads up! The UV radiation from the Sun can almost be doubled by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Exeter, IL
- Average high temperature in December: 39.2°F
The warmest month (with the highest average high temperature) is July (84°F).
The month with the lowest average high temperature is January (33.8°F).
- Average low temperature in December: 27.9°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 (21.6°F).
Average pressure in December
Exeter, IL
- Average pressure in December: 30.12"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in December
Exeter, IL
- Average wind speed in December: 9.4mph
The windiest months (with the highest average wind speed) are January and April (9.9mph).
The calmest month (with the lowest average wind speed) is July (6mph).
Average humidity in December
Exeter, IL
- Average humidity in December: 77%
The month with the highest relative humidity is July (82%).
The month with the lowest relative humidity is October (71%).
Average rainfall in December
Exeter, IL
- Average rainfall in December: 1.73"
The wettest month (with the highest rainfall) is May (4.02").
The driest months (with the least rainfall) are January, February and December (1.73").
Average rainfall days in December
Exeter, IL
- Average rainfall days in December: 8.1 days
The month with the highest number of rainy days is May (18.8 days).
The month with the least rainy days is February (7.2 days).
Average snowfall in December
Exeter, IL
- Average snowfall in December: 1.54"
The month with the highest snowfall is January (3.46").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Exeter, IL
- Average snowfall days in December: 5.9 days
The month with the highest number of snowfall days is January (9.8 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
Exeter, IL
- Average daylight in December: 9h and 24min
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 24min).
- Average sunshine in December: 4h and 48min
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 18min).
Average sunshine days in December
Exeter, IL
- Average sunshine days in December: 17.9 days
The month with the most sunshine days is November (18.5 days).
The month with the least sunshine days is June (8.6 days).
Average UV index in December
Exeter, 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
Exeter, IL
- Average cloud cover in December: 49
The month with the most cloud cover is January (Cloud cover 52).
The months with the least cloud cover are June, July, August and September (Cloud cover 30).
Average visibility in December
Exeter, IL
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, August, September, October, November and December (6mi).
The month with the lowest visibility is July (5mi).
