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 is the coldest month, with an average high-temperature of 33.6°F (0.9°C) and an average low-temperature of 21.4°F (-5.9°C).Humidity
In Chatham, the average relative humidity in January is 79%.Rainfall
In Chatham, in January, during 4.4 rainfall days, 0.63" (16mm) of precipitation is typically accumulated. Throughout the year, there are 104.2 rainfall days, and 9.29" (236mm) of precipitation is accumulated.Snowfall
Months with snowfall in Chatham are January through April, November and December. In Chatham, during January, snow falls for 5.7 days and regularly aggregates up to 0.63" (16mm) of snow. In Chatham, during the entire year, snow falls for 18.6 days and aggregates up to 2.68" (68mm) of snow.Daylight
In January, the average length of the day is 9h and 44min.On the first day of January in Chatham, Illinois, sunrise is at 7:19 am and sunset at 4:44 pm. On the last day of the month, sunrise is at 7:07 am and sunset at 5:16 pm CST.
Sunshine
The month with the least sunshine in Chatham, Illinois, is January, with an average of 4.2h of sunshine.UV index
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a low threat to health from exposure to the Sun's UV rays for ordinary individuals.Note: The daily high UV index of 2 in January translates into this advice:
Extended sunlight exposure does not pose significant problems for most people, except for children, infants, and people with fair skin who always need shielding. Stay safe from the Sun's strongest UV rays by limiting exposure during midday. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes. Be prepared! The intensity of the Sun's UV radiation can be amplified nearly double due to snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the coldest month in Chatham?
How cold is it in Chatham in January?
What is the average humidity in January in Chatham?
How many days does it rain in January in Chatham?
How many days does it snow in January in Chatham?
How many hours of daylight does Chatham have in January?
What time are sunrise and sunset in January in Chatham?
What is the month with the least sunshine in Chatham?
How long on average sun shines in January in Chatham?
What is the month with the lowest UV index in Chatham?
What is the UV index reading in January in Chatham?
Average temperature in January
Chatham, IL
- Average high temperature in January: 33.6°F
The warmest month (with the highest average high temperature) is July (82.8°F).
The month with the lowest average high temperature is January (33.6°F).
- Average low temperature in January: 21.4°F
The month with the highest average low temperature is July (66.6°F).
The coldest month (with the lowest average low temperature) is January (21.4°F).
Average pressure in January
Chatham, 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 (29.91"Hg).
Average wind speed in January
Chatham, IL
- Average wind speed in January: 10.4mph
The windiest month (with the highest average wind speed) is January (10.4mph).
The calmest month (with the lowest average wind speed) is July (6.1mph).
Average humidity in January
Chatham, 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
Chatham, IL
- Average rainfall in January: 0.63"
The wettest month (with the highest rainfall) is June (1.22").
The driest month (with the least rainfall) is December (0.43").
Average rainfall days in January
Chatham, IL
- Average rainfall days in January: 4.4 days
The month with the highest number of rainy days is May (12.5 days).
The month with the least rainy days is January (4.4 days).
Average snowfall in January
Chatham, IL
- Average snowfall in January: 0.63"
The month with the highest snowfall is February (0.91").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in January
Chatham, IL
- Average snowfall days in January: 5.7 days
The month with the highest number of snowfall days is January (5.7 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
Chatham, IL
- Average daylight in January: 9h and 4min
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 1min
The month with the most sunshine is June (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 12min).
Average sunshine days in January
Chatham, IL
- Average sunshine days in January: 22.2 days
The month with the most sunshine days is December (22.6 days).
The month with the least sunshine days is June (14 days).
Average UV index in January
Chatham, IL
- Average UV index in January: 2
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in January
Chatham, IL
- Average cloud cover in January: 54
The month with the most cloud cover is January (Cloud cover 54).
The months with the least cloud cover are June and September (Cloud cover 29).
Average visibility in January
Chatham, 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).
Chatham, Illinois, USA
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