Contents
- Weather in January
- Frequently asked questions
- Average temperature in January
- Average pressure in January
- Average wind speed in January
- Average humidity in January
- Average rainfall in January
- Average rainfall days in January
- Average snowfall in January
- Average snowfall days in January
- Average daylight in January
- Average sunshine in January
- Average sunshine days in January
- Average UV index in January
- Average cloud cover in January
- Average visibility in January
Weather in January
Temperature
With its high average temperature of 39.6°F (4.2°C) and a low of 26.1°F (-3.3°C), January is regarded as the coldest month.Humidity
In January, the average relative humidity is 76%.Rainfall
In Carterville, during January, the rain falls for 8.8 days and regularly aggregates up to 1.42" (36mm) of precipitation. In Carterville, during the entire year, the rain falls for 137.6 days and collects up to 23.03" (585mm) of precipitation.Snowfall
Months with snowfall are January through April, October through December. The months with the most snowfall are January and February, with an average 0.94" (24mm) of accumulated snow.Daylight
The average length of the day in January is 9h and 54min.On the first day of January, sunrise is at 7:11 am and sunset at 4:47 pm. On the last day of the month, sunrise is at 7:01 am and sunset at 5:18 pm CST.
Sunshine
January has the least sunshine of the year, with an average of 4.6h of sunshine.UV index
The months with the lowest UV index are January, February and December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a low health risk from exposure to the Sun's UV radiation for average individuals.Note: The UV index of 2 during January translates into the following guidance:
Long-term sun exposure is typically not a concern for most. However, those with sensitive skin, infants, and children must always have protection. Minimize direct exposure to the Sun during midday when its radiation is at its peak. For minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage. Take heed! The reflection of snow can intensify the Sun's UV radiation nearly double.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What time of the year is the coldest?
Is January cold?
What is the average humidity in January?
How many days does it rain in January?
What is the snowiest month?
How many days does it snow in January?
What is the average length of the day in January?
When is the sunrise / sunset in January?
What is the month with the least sunshine?
How long on average sun shines in January?
What are the months with the lowest UV index?
What is the UV index reading in January?
Average temperature in January
Carterville, IL
- Average high temperature in January: 39.6°F
The warmest month (with the highest average high temperature) is July (87.4°F).
The month with the lowest average high temperature is January (39.6°F).
- Average low temperature in January: 26.1°F
The month with the highest average low temperature is July (68.5°F).
The coldest month (with the lowest average low temperature) is January (26.1°F).
Average pressure in January
Carterville, IL
- Average pressure in January: 30.16"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in January
Carterville, IL
- Average wind speed in January: 9.4mph
The windiest months (with the highest average wind speed) are January and February (9.4mph).
The calmest months (with the lowest average wind speed) are July and August (5.8mph).
Average humidity in January
Carterville, IL
- Average humidity in January: 76%
The month with the highest relative humidity is May (79%).
The month with the lowest relative humidity is October (71%).
Average rainfall in January
Carterville, IL
- Average rainfall in January: 1.42"
The wettest month (with the highest rainfall) is April (3.11").
The driest month (with the least rainfall) is September (1.1").
Average rainfall days in January
Carterville, IL
- Average rainfall days in January: 8.8 days
The month with the highest number of rainy days is July (15.3 days).
The month with the least rainy days is November (7.8 days).
Average snowfall in January
Carterville, IL
- Average snowfall in January: 0.94"
The months with the highest snowfall are January and February (0.94").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in January
Carterville, IL
- Average snowfall days in January: 4.1 days
The month with the highest number of snowfall days is February (4.3 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in January /
Average sunshine in January
Carterville, IL
- Average daylight in January: 9h and 5min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in January: 4h and 4min
The months with the most sunshine are June and July (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 4h and 36min).
Average sunshine days in January
Carterville, IL
- Average sunshine days in January: 18.1 days
The month with the most sunshine days is October (20.6 days).
The month with the least sunshine days is July (12.9 days).
Average UV index in January
Carterville, IL
- Average UV index in January: 2
The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February and December (UV index 2).
Average cloud cover in January
Carterville, IL
- Average cloud cover in January: 50
The month with the most cloud cover is February (Cloud cover 51).
The months with the least cloud cover are June, August and September (Cloud cover 28).
Average visibility in January
Carterville, IL
- Average visibility in January: 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).
Carterville, Illinois, USA
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