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
December's arrival correlates with a reduction in the average high-temperature, down from a frosty 47.5°F (8.6°C) in November to a cold 36°F (2.2°C). During the month of December, an average low-temperature of 25.7°F (-3.5°C) is recorded.Humidity
In December, the average relative humidity is 81%.Rainfall
In Chillicothe, during December, the rain falls for 5.7 days and regularly aggregates up to 0.75" (19mm) of precipitation. In Chillicothe, during the entire year, the rain falls for 123.4 days and collects up to 15.12" (384mm) of precipitation.Snowfall
January through April, October through December are months with snowfall. In Chillicothe, in December, during 6.3 snowfall days, 0.94" (24mm) of snow is typically accumulated. Throughout the year, there are 27.8 snowfall days, and 6.46" (164mm) of snow is accumulated.Daylight
December has the shortest days of the year, 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 4:30 pm. On the last day of December, sunrise is at 7:22 am and sunset at 4:40 pm CST.
Sunshine
In Chillicothe, the average sunshine in December is 4.3h.UV index
The months with the lowest UV index are January and December, with an average maximum UV index of 1. A UV Index of 2, and less, symbolizes a low health risk from unprotected exposure to Sun's UV rays for the average person.Note: In December, the average maximum UV index of 1 translates into the following recommendations:
Though extended exposure to the sun typically does not concern most people, it is crucial to always shield children, infants, and those with sensitive skin. Direct exposure to the Sun's intense radiation around midday should be avoided for health reasons. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days. Be mindful! The reflection from snow can increase the Sun's UV radiation nearly twice.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is it in Chillicothe in December?
What is the average humidity in December?
How many days does it rain in December?
How many days does it snow in December in Chillicothe?
What is the month with the shortest days?
How many hours of daylight does Chillicothe have in December?
What time are sunrise and sunset in December?
How long on average sun shines in December?
When is the lowest UV index?
What is the UV index reading in December?
Average temperature in December
Chillicothe, IL
- Average high temperature in December: 36°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 (29.8°F).
- Average low temperature in December: 25.7°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 (18.1°F).
Average pressure in December
Chillicothe, 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
Chillicothe, IL
- Average wind speed in December: 9.8mph
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
Chillicothe, IL
- Average humidity in December: 81%
The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is October (72%).
Average rainfall in December
Chillicothe, IL
- Average rainfall in December: 0.75"
The wettest month (with the highest rainfall) is May (2.36").
The driest month (with the least rainfall) is January (0.67").
Average rainfall days in December
Chillicothe, IL
- Average rainfall days in December: 5.7 days
The month with the highest number of rainy days is May (16.2 days).
The month with the least rainy days is February (4.5 days).
Average snowfall in December
Chillicothe, IL
- Average snowfall in December: 0.94"
The month with the highest snowfall is January (1.93").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Chillicothe, IL
- Average snowfall days in December: 6.3 days
The month with the highest number of snowfall days is January (9.2 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
Chillicothe, IL
- Average daylight in December: 9h and 2min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in December: 4h and 2min
The month with the most sunshine is June (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).
Average sunshine days in December
Chillicothe, IL
- Average sunshine days in December: 19.9 days
The month with the most sunshine days is November (20.2 days).
The month with the least sunshine days is May (12.4 days).
Average UV index in December
Chillicothe, IL
- Average UV index in December: 1
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in December
Chillicothe, 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
Chillicothe, 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).
Chillicothe, Illinois, USA
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