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

In Downers Grove, January records the lowest average temperatures, peaking at 28.8°F (-1.8°C) and reaching a low of 17.1°F (-8.3°C).

Humidity

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

Rainfall

In Downers Grove, in January, during 4.3 rainfall days, 0.67" (17mm) of precipitation is typically accumulated. Throughout the year, there are 118.5 rainfall days, and 13.74" (349mm) of precipitation is accumulated.

Snowfall

Months with snowfall in Downers Grove are January through April, October through December. In Downers Grove, in January, snow falls for 9.7 days, with typically accumulated 1.81" (46mm) of snow. Throughout the year, there are 34.9 snowfall days, and 7.2" (183mm) of snow is accumulated.

Daylight

In January, the average length of the day in Downers Grove 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 in Downers Grove, Illinois, 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 reading of 2, and below, represents a minimal health hazard from unsafe exposure to UV radiation for ordinary individuals.
Note: In January, the maximum UV index of 1 translates into these guidelines:
Babies, children, and individuals with sensitive skin should always have protection against extended sun exposure. Around midday, solar radiation is most harmful; hence, exposure should be limited. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance. Notice! The UV radiation of the Sun can be intensified nearly twofold due to the reflective quality of snow.
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Frequently asked questions

What time of the year is the coldest in Downers Grove?

Downers Grove reaches its average lowest temperatures in January, measuring 28.8°F (-1.8°C) at the peak and 17.1°F (-8.3°C) at the lowest.

How cold is January in Downers Grove?

In Downers Grove, in January, the average high-temperature is 28.8°F (-1.8°C), and the average low-temperature is 17.1°F (-8.3°C).

What is the most humid month in Downers Grove?

January and February, with an average relative humidity of 82%, are most humid months in Downers Grove, Illinois.

What is the average humidity in January in Downers Grove?

The average relative humidity in January in Downers Grove is 82%.

How many days does it rain in January in Downers Grove?

In Downers Grove, Illinois, in January, it is raining for 4.3 days, with typically 0.67" (17mm) of accumulated precipitation.

How much does it snow in Downers Grove in January?

In January, in Downers Grove, it is snowing for 9.7 days. Throughout January, 1.81" (46mm) of snow is accumulated.

What is the average length of the day in January in Downers Grove?

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

When is the sunrise / sunset in January in Downers Grove?

On the first day of January in Downers Grove, Illinois, 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?

With an average of 3.7h of sunshine, January has the least sunshine of the year in Downers Grove, Illinois.

How long on average sun shines in January in Downers Grove?

In Downers Grove, the average sunshine duration in January is 3.7h.

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

With an average maximum UV index of 1, January is the month with the lowest UV index in Downers Grove.

What is the UV index reading in January in Downers Grove?

In Downers Grove, Illinois, the average daily maximum UV index in January is 1. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV radiation.
Today
Tomorrow
Long-term
YearJanuaryFMAMJJASOND
Dec
January
Feb
Average high temperature
34.5°F 1.4°C
28.8°F -1.8°C
32.5°F 0.3°C
Average low temperature
25°F -3.9°C
17.1°F -8.3°C
19.9°F -6.7°C
Average pressure
30.09" 764mmHg
30.11" 765mmHg
30.1" 765mmHg
Average wind speed
9mph 14.5km/h
9.7mph 15.6km/h
9.6mph 15.4km/h
Average max. wind speed
9.6mph 15.4km/h
10.3mph 16.6km/h
10.1mph 16.3km/h
Average wind speed gusts
13.5mph 21.7km/h
14.5mph 23.3km/h
14.5mph 23.3km/h
Average humidity
81%
82%
82%
Average rainfall
0.63" 16mm
0.67" 17mm
0.71" 18mm
Average rainfall days
4.9
4.3
4.2
Average snowfall
0.75" 19mm
1.81" 46mm
2.28" 58mm
Average snowfall days
7.2
9.7
8.6
Average daylight
9h 1min
9h 4min
10h 4min
Average sunshine
4h 1min
3h 4min
3h 5min
Average sunshine days
20.7
19.7
17.3
Average UV index
2
1
2
Average cloud cover
59%
61%
58%
Average visibility
6mi 9.7km
6mi 9.7km
6mi 9.7km

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).

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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).

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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).

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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%).

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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").

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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).

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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").

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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).

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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).

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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).

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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).

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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).

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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).

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Downers Grove, Illinois, USA

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