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
January proves to be the coldest month, recording an average maximum temperature of 39.6°F (4.2°C) and a minimum temperature of 25.7°F (-3.5°C).Humidity
The average relative humidity in January in Chester is 75%.Rainfall
In Chester, during January, the rain falls for 7.9 days and regularly aggregates up to 2.13" (54mm) of precipitation. Throughout the year, there are 156.4 rainfall days, and 34.25" (870mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through April, October through December. In Chester, during January, snow falls for 4.8 days and regularly aggregates up to 1.81" (46mm) of snow. Throughout the year, there are 16 snowfall days, and 6.89" (175mm) of snow is accumulated.Daylight
In January, the average length of the day is 9h and 53min.On the first day of January, sunrise is at 7:14 am and sunset at 4:50 pm. On the last day of the month, sunrise is at 7:04 am and sunset at 5:20 pm CST.
Sunshine
With an average of 4.7h of sunshine, January has the least sunshine of the year.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 value of 2, and less, symbolizes a minimal health hazard from unprotected exposure to Sun's UV rays for the average person.Note: In January, a regular UV index of 2 translates into these guidelines:
Babies, children, and individuals with sensitive skin should always have protection against extended sun exposure. Direct exposure to the Sun's intense radiation around midday should be avoided for health reasons. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation. Mind you! Snow reflection can increase the intensity of the Sun's UV radiation nearly twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What time of the year is the coldest in Chester?
How cold is January?
What is the average humidity in January in Chester?
How much does it rain in January?
How many days does it snow in January?
What is the average length of the day in January?
What time are sunrise and sunset in January in Chester?
What is the month with the least sunshine?
How many hours of sunshine does Chester have in January?
When is the lowest UV index?
How high is the UV index in January?
Average temperature in January
Chester, 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: 25.7°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 (25.7°F).
Average pressure in January
Chester, 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 (29.93"Hg).
Average wind speed in January
Chester, IL
- Average wind speed in January: 9.4mph
The windiest month (with the highest average wind speed) is January (9.4mph).
The calmest month (with the lowest average wind speed) is August (5.5mph).
Average humidity in January
Chester, IL
- Average humidity in January: 75%
The month with the highest relative humidity is May (79%).
The month with the lowest relative humidity is October (71%).
Average rainfall in January
Chester, IL
- Average rainfall in January: 2.13"
The wettest month (with the highest rainfall) is April (4.13").
The driest month (with the least rainfall) is September (1.97").
Average rainfall days in January
Chester, IL
- Average rainfall days in January: 7.9 days
The month with the highest number of rainy days is July (17.8 days).
The month with the least rainy days is January (7.9 days).
Average snowfall in January
Chester, IL
- Average snowfall in January: 1.81"
The month with the highest snowfall is February (2.56").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in January
Chester, IL
- Average snowfall days in January: 4.8 days
The month with the highest number of snowfall days is February (5.2 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
Chester, IL
- Average daylight in January: 9h and 5min
The month with the longest days is June (Average daylight: 14h and 48min).
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 42min).
Average sunshine days in January
Chester, IL
- Average sunshine days in January: 18.8 days
The month with the most sunshine days is October (18.9 days).
The month with the least sunshine days is July (9.8 days).
Average UV index in January
Chester, 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
Chester, IL
- Average cloud cover in January: 48
The months with the most cloud cover are January and February (Cloud cover 48).
The month with the least cloud cover is June (Cloud cover 27).
Average visibility in January
Chester, 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).
Chester, Illinois, USA
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