January weather forecast
Downers Grove, IL

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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.

Frequently asked questions

What is the coldest time of year?

Temperature records mark January as the coldest month, with highs averaging 28.8°F (-1.8°C) and lows at 17.1°F (-8.3°C).

How cold is January?

January temperatures vary between a high-temperature of 28.8°F (-1.8°C) and a low-temperature of 17.1°F (-8.3°C).

What are the most humid months?

The months with the highest humidity are January and February, with an average relative humidity of 82%.

What is the average humidity in January?

In Downers Grove, the average relative humidity in January is 82%.

How much does it rain in January?

In January, the rain falls for 4.3 days. Throughout January, 0.67" (17mm) of precipitation is accumulated.

How much does it snow in January?

In Downers Grove, Illinois, during January, snow falls for 9.7 days and regularly aggregates up to 1.81" (46mm) of snow.

How many hours of daylight does Downers Grove have in January?

In January, the average day length is 9h and 33min.

What time are sunrise and sunset in January?

In January, on the first day of the month, sunrise is at 7:19 am and sunset at 4:31 pm. On the last day of the month, sunrise is at 7:05 am and sunset at 5:05 pm CST.

What is the month with the least sunshine in Downers Grove?

January has the least sunshine of the year, with an average of 3.7h of sunshine.

How long on average sun shines in January?

In January, the average sunshine duration is 3.7h.

What is the month with the lowest UV index in Downers Grove?

The month with the lowest UV index is January, with an average maximum UV index of 1.

What is the UV index intensity in January?

In Downers Grove, Illinois, the average daily maximum UV index in January is 1. A UV Index reading of 2, and below, represents a low health risk from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in January
Downers Grove, IL

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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 / Average sunshine in January - Downers Grove, IL
  • Average daylight in January: 9h and 4min

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 4min

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 - 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 - 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 - 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 - 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).

Downers Grove, Illinois, USA

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