January weather forecastDowners Grove, IL
January
Weather in January
Brisk cold reigns in January in Downers Grove, marking the onset of the year with snowfall as high as 1.81" (46mm). The chilly January weather is somewhat harsher relative to December, and certainly more intense than the coming month of February. A prominent feature of this period is the high relative humidity, reinforcing the icy effect of the season. The short daylight hours eclipse sunshine in January, leading to rather bleak days. Nevertheless, the clear visibility amid the snowy landscapes provides some respite.Temperature
Downers Grove's January weather, with an average high temperature of 28.8°F (-1.8°C) and an average low temperature of 17.1°F (-8.3°C), tends to be the coldest of the year.Humidity
The months with the highest humidity are January and February, with an average relative humidity of 82%.Rainfall
In January, the rain falls for 4.3 days. Throughout January, 0.67" (17mm) of precipitation is accumulated. Throughout the year, there are 118.5 rainfall days, and 13.74" (349mm) of precipitation is accumulated.Snowfall
January through April, October through December are months with snowfall. In Downers Grove, in January, during 9.7 snowfall days, 1.81" (46mm) of snow is typically accumulated. Throughout the year, there are 34.9 snowfall days, and 7.2" (183mm) of snow is accumulated.Daylight
In Downers Grove, the average length of the day in January is 9h and 33min.On the first day of the month, sunrise is at 7:19 am and sunset at 4:31 pm. On the last day of January, sunrise is at 7:05 am and sunset at 5:05 pm CST.
Sunshine
The month with the least sunshine is January, with an average of 3.7h of sunshine.UV index
The month with the lowest UV index is January, with an average maximum UV index of 1. A UV Index of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV radiation for the average person.Note: In January, the UV index of 1 transforms into the following advice:
While most can endure approximately an hour in the sun without burning, children always require protection from sunlight. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. Experience reduced UV exposure by about half when donning a wide-brim hat. Consider this! The reflection from snow can almost double the intensity of the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in January
Downers Grove, IL
- Average high temperature in January: 28.8°F
The warmest month (with the highest average high temperature) is July (82.4°F).
The month with the lowest average high temperature is January (28.8°F).
- Average low temperature in January: 17.1°F
The month with the highest average low temperature is July (66.4°F).
The coldest month (with the lowest average low temperature) is January (17.1°F).
Average pressure in January
Downers Grove, 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
Downers Grove, IL
- Average wind speed in January: 9.7mph
The windiest month (with the highest average wind speed) is January (9.7mph).
The calmest month (with the lowest average wind speed) is August (6.1mph).
Average humidity in January
Downers Grove, 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
Downers Grove, IL
- Average rainfall in January: 0.67"
The wettest month (with the highest rainfall) is May (1.97").
The driest month (with the least rainfall) is December (0.63").
Average rainfall days in January
Downers Grove, IL
- Average rainfall days in January: 4.3 days
The month with the highest number of rainy days is May (14.9 days).
The month with the least rainy days is February (4.2 days).
Average snowfall in January
Downers Grove, IL
- Average snowfall in January: 1.81"
The month with the highest snowfall is February (2.28").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in January
Downers Grove, IL
- Average snowfall days in January: 9.7 days
The month with the highest number of snowfall days is January (9.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in January /
Average sunshine in January
Downers Grove, IL
- Average daylight in January: 9h and 36min
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 month with the most sunshine is August (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in January
Downers Grove, IL
- Average sunshine days in January: 19.7 days
The month with the most sunshine days is December (20.7 days).
The month with the least sunshine days is July (11.8 days).
Average UV index in January
Downers Grove, IL
- Average UV index in January: 1
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover in January
Downers Grove, 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 31).
Average visibility in January
Downers Grove, 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).
