January weather forecastWestchester, IL
January
Weather in January
January, the same as December, in Westchester, Illinois, is another subzero cold winter month, with an average temperature fluctuating between 18°F (-7.8°C) and 28.8°F (-1.8°C).Temperature
Westchester records the coldest temperatures in January, averaging a high of 28.8°F (-1.8°C) and a low of 18°F (-7.8°C).Humidity
The months with the highest humidity are January and February, with an average relative humidity of 82%.Rainfall
In Westchester, during January, the rain falls for 6.3 days and regularly aggregates up to 1.34" (34mm) of precipitation. Throughout the year, in Westchester, there are 149.4 rainfall days, and 25.08" (637mm) of precipitation is accumulated.Snowfall
Months with snowfall in Westchester are January through May, October through December. In Westchester, in January, snow falls for 12.4 days, with typically accumulated 3.62" (92mm) of snow. Throughout the year, there are 45.8 snowfall days, and 14.25" (362mm) of snow is accumulated.Daylight
The average length of the day in January is 9h and 33min.On the first day of January, sunrise is at 7:18 am and sunset at 4:30 pm. On the last day of the month, sunrise is at 7:05 am and sunset at 5:04 pm CST.
Sunshine
January has the least sunshine of the year, with an average of 3.7h of sunshine.UV index
The months with the lowest UV index in Westchester are January and December, with an average maximum UV index of 1. A UV Index estimate of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV rays for the average person.Note: The maximum UV index, 1 during January, leads to the following recommendations:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to be protected. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses. Take precaution! The reflection from snow can almost double the UV radiation of the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in January
Westchester, IL
- Average high temperature in January: 28.8°F
The warmest month (with the highest average high temperature) is July (81.9°F).
The month with the lowest average high temperature is January (28.8°F).
- Average low temperature in January: 18°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 (18°F).
Average pressure in January
Westchester, IL
- Average pressure in January: 30.11"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in January
Westchester, IL
- Average wind speed in January: 10.2mph
The windiest month (with the highest average wind speed) is January (10.2mph).
The calmest month (with the lowest average wind speed) is August (6.3mph).
Average humidity in January
Westchester, IL
- Average humidity in January: 82%
The months with the highest relative humidity are January and February (82%).
The month with the lowest relative humidity is October (72%).
Average rainfall in January
Westchester, IL
- Average rainfall in January: 1.34"
The wettest month (with the highest rainfall) is May (3.11").
The driest month (with the least rainfall) is December (1.14").
Average rainfall days in January
Westchester, IL
- Average rainfall days in January: 6.3 days
The months with the highest number of rainy days are May and July (17.3 days).
The month with the least rainy days is February (5.1 days).
Average snowfall in January
Westchester, IL
- Average snowfall in January: 3.62"
The month with the highest snowfall is February (3.86").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in January
Westchester, IL
- Average snowfall days in January: 12.4 days
The month with the highest number of snowfall days is January (12.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in January /
Average sunshine in January
Westchester, IL
- Average daylight in January: 9h and 30min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in January: 3h and 42min
The months with the most sunshine are July and August (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in January
Westchester, IL
- Average sunshine days in January: 14.2 days
The month with the most sunshine days is November (16.8 days).
The month with the least sunshine days is July (9.5 days).
Average UV index in January
Westchester, IL
- Average UV index in January: 1
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in January
Westchester, IL
- Average cloud cover in January: 61
The month with the most cloud cover is January (Cloud cover 61).
The month with the least cloud cover is August (Cloud cover 30).
Average visibility in January
Westchester, 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).
