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 start of December comes with a reduction in the average high-temperature, receding from a chilly 49.1°F (9.5°C) in November to a wintry 37°F (2.8°C). In the month of December, the average temperature dips to a freezing cold 25.9°F (-3.4°C) during the night.Humidity
The average relative humidity in December in Colchester is 79%.Rainfall
The month with the least rainfall is December, when the rain falls for 4.3 days and typically collects 0.35" (9mm) of precipitation.Snowfall
January through April, October through December are months with snowfall. In Colchester, in December, snow falls for 3.7 days, with typically accumulated 0.24" (6mm) of snow. In Colchester, during the entire year, snow falls for 20.5 days and aggregates up to 2.44" (62mm) of snow.Daylight
The month with the shortest days is December, with an average of 9h and 18min of daylight.On the first day of December in Colchester, Illinois, sunrise is at 7:07 am and sunset at 4:37 pm. On the last day of the month, sunrise is at 7:26 am and sunset at 4:46 pm CST.
Sunshine
The average sunshine in December is 4.6h.UV index
In December, the average daily maximum UV index in Colchester is 2. A UV Index reading of 2, and below, represents a low health risk from exposure to the Sun's UV rays for the average person.Note: The UV index of 2 in December translates into these instructions:
Many can withstand an hour in the sun without burning, yet children must always have protection against sunlight. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance. Consider this! The reflection from snow can almost double the intensity of the Sun's UV radiation.
Frequently asked questions
How cold is December in Colchester?
What is the average humidity in December in Colchester?
What is the driest month in Colchester?
How much does it rain in Colchester in December?
How much does it snow in Colchester in December?
What is the month with the shortest days in Colchester?
How many hours of daylight does Colchester have in December?
What time are sunrise and sunset in December in Colchester?
How long on average sun shines in December in Colchester?
What is the UV index intensity in December in Colchester?
Average temperature in December
Colchester, IL
- Average high temperature in December: 37°F
The warmest month (with the highest average high temperature) is July (82.6°F).
The month with the lowest average high temperature is January (31.1°F).
- Average low temperature in December: 25.9°F
The month with the highest average low temperature is July (66.2°F).
The coldest month (with the lowest average low temperature) is January (19°F).
Average pressure in December
Colchester, 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 (29.9"Hg).
Average wind speed in December
Colchester, IL
- Average wind speed in December: 9.9mph
The windiest month (with the highest average wind speed) is January (10.5mph).
The calmest months (with the lowest average wind speed) are July and August (6.6mph).
Average humidity in December
Colchester, IL
- Average humidity in December: 79%
The month with the highest relative humidity is July (83%).
The month with the lowest relative humidity is October (71%).
Average rainfall in December
Colchester, IL
- Average rainfall in December: 0.35"
The wettest month (with the highest rainfall) is May (1.1").
The driest month (with the least rainfall) is December (0.35").
Average rainfall days in December
Colchester, IL
- Average rainfall days in December: 4.3 days
The month with the highest number of rainy days is May (12.3 days).
The month with the least rainy days is January (3.3 days).
Average snowfall in December
Colchester, IL
- Average snowfall in December: 0.24"
The month with the highest snowfall is January (0.67").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Colchester, IL
- Average snowfall days in December: 3.7 days
The month with the highest number of snowfall days is January (6.3 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
Colchester, 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 18min).
- Average sunshine in December: 4h and 4min
The months with the most sunshine are June and July (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).
Average sunshine days in December
Colchester, IL
- Average sunshine days in December: 23.5 days
The month with the most sunshine days is December (23.5 days).
The month with the least sunshine days is June (13.9 days).
Average UV index in December
Colchester, IL
- Average UV index in December: 2
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover in December
Colchester, IL
- Average cloud cover in December: 51
The month with the most cloud cover is January (Cloud cover 55).
The month with the least cloud cover is August (Cloud cover 29).
Average visibility in December
Colchester, IL
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Colchester, Illinois, USA
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