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
The coldest temperatures occur during January, when averages reach a peak of 34°F (1.1°C) and a low of 21.9°F (-5.6°C).Humidity
The average relative humidity in January is 79%.Rainfall
In January, the rain falls for 8.2 days. Throughout January, 1.81" (46mm) of precipitation is accumulated. In Charleston, during the entire year, the rain falls for 148 days and collects up to 25.63" (651mm) of precipitation.Snowfall
Months with snowfall are January through April, October through December. In Charleston, during January, snow falls for 8.1 days and regularly aggregates up to 1.5" (38mm) of snow. Throughout the year, there are 26.6 snowfall days, and 7.01" (178mm) of snow is accumulated.Daylight
In Charleston, the average length of the day in January is 9h and 46min.On the first day of the month, sunrise is at 7:12 am and sunset at 4:39 pm. On the last day of January, sunrise is at 7:01 am and sunset at 5:11 pm CST.
Sunshine
The month with the least sunshine is January, with an average of 4h of sunshine.UV index
In Charleston, the average daily maximum UV index in January is 2. A UV Index value of 2, and less, symbolizes a low health risk from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The daily high UV index of 2 in January translates into this advice:
While most people are not greatly affected by extended sun exposure, those with fair skin, babies, and children must always have protection. Stay safe from the Sun's strongest UV rays by limiting exposure during midday. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears. Keep in mind! Snow's reflective quality can nearly double the intensity of the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the coldest time of year?
How cold is it in January?
What is the average humidity in January?
How many days does it rain in January?
How much does it snow in January?
What is the average length of the day in January?
When are sunrise and sunset in January?
What is the month with the least sunshine?
How many hours of sunshine does Charleston have in January?
What is the UV index intensity in January?
Average temperature in January
Charleston, IL
- Average high temperature in January: 34°F
The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (34°F).
- Average low temperature in January: 21.9°F
The month with the highest average low temperature is July (65.8°F).
The coldest month (with the lowest average low temperature) is January (21.9°F).
Average pressure in January
Charleston, IL
- Average pressure in January: 30.15"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in January
Charleston, IL
- Average wind speed in January: 10.7mph
The windiest month (with the highest average wind speed) is January (10.7mph).
The calmest month (with the lowest average wind speed) is July (6.2mph).
Average humidity in January
Charleston, IL
- Average humidity in January: 79%
The month with the highest relative humidity is July (83%).
The month with the lowest relative humidity is October (70%).
Average rainfall in January
Charleston, IL
- Average rainfall in January: 1.81"
The wettest month (with the highest rainfall) is April (3.31").
The driest month (with the least rainfall) is February (1.3").
Average rainfall days in January
Charleston, IL
- Average rainfall days in January: 8.2 days
The month with the highest number of rainy days is May (16.8 days).
The month with the least rainy days is February (7.8 days).
Average snowfall in January
Charleston, IL
- Average snowfall in January: 1.5"
The month with the highest snowfall is December (2.13").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in January
Charleston, IL
- Average snowfall days in January: 8.1 days
The month with the highest number of snowfall days is January (8.1 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
Charleston, IL
- Average daylight in January: 9h and 5min
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 January: 4h and 0min
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 0min).
Average sunshine days in January
Charleston, IL
- Average sunshine days in January: 15.9 days
The month with the most sunshine days is October (18.3 days).
The month with the least sunshine days is July (10.6 days).
Average UV index in January
Charleston, IL
- Average UV index in January: 2
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in January
Charleston, IL
- Average cloud cover in January: 56
The month with the most cloud cover is January (Cloud cover 56).
The month with the least cloud cover is June (Cloud cover 31).
Average visibility in January
Charleston, IL
- Average visibility in January: 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).
Charleston, Illinois, USA
Weather forecast for your location
2. Allow the app to use your location