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
In Summit, the month of January registers the lowest temperatures, averaging 29.5°F (-1.4°C) at the peak and 19.2°F (-7.1°C) at the lowest.Humidity
January and February, with an average relative humidity of 82%, are the most humid months.Rainfall
In Summit, during January, the rain falls for 4.4 days and regularly aggregates up to 0.51" (13mm) of precipitation. Throughout the year, there are 110.8 rainfall days, and 9.61" (244mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through April, October through December. In Summit, Illinois, during January, snow falls for 10.1 days and regularly aggregates up to 1.06" (27mm) of snow. Throughout the year, there are 32.3 snowfall days, and 4.09" (104mm) of snow is accumulated.Daylight
In Summit, the average length of the day in January is 9h and 34min.On the first day of the month, sunrise is at 7:18 am and sunset at 4:30 pm. On the last day of January, sunrise is at 7:04 am and sunset at 5:04 pm CST.
Sunshine
January has the least sunshine of the year in Summit, with an average of 3.7h of sunshine.UV index
The average daily maximum UV index in January is 2. A UV Index reading of 2, and below, represents a low threat to health from exposure to the Sun's UV rays for the average person.Note: The maximum UV index, 2 during January, leads to the following recommendations:
While most individuals can withstand prolonged sun exposure, it is imperative that babies, children, and those with sensitive skin always be shielded. Avoid the Sun's strongest UV rays by seeking shade and limiting exposure during midday. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage. Beware! Reflection from snow can magnify the Sun's UV radiation nearly twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the coldest time of year in Summit?
How cold is it in Summit in January?
What are the most humid months in Summit?
What is the average humidity in January in Summit?
How many days does it rain in January in Summit?
How much does it snow in Summit in January?
How many hours of daylight does Summit have in January?
When are sunrise and sunset in January in Summit?
What is the month with the least sunshine in Summit?
How long on average sun shines in January in Summit?
What is the UV index reading in January in Summit?
Average temperature in January
Summit, IL
- Average high temperature in January: 29.5°F
The warmest month (with the highest average high temperature) is July (80.8°F).
The month with the lowest average high temperature is January (29.5°F).
- Average low temperature in January: 19.2°F
The month with the highest average low temperature is July (67.1°F).
The coldest month (with the lowest average low temperature) is January (19.2°F).
Average pressure in January
Summit, 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
Summit, IL
- Average wind speed in January: 10.9mph
The windiest month (with the highest average wind speed) is January (10.9mph).
The calmest month (with the lowest average wind speed) is August (6.7mph).
Average humidity in January
Summit, 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
Summit, IL
- Average rainfall in January: 0.51"
The wettest month (with the highest rainfall) is May (1.38").
The driest month (with the least rainfall) is December (0.43").
Average rainfall days in January
Summit, IL
- Average rainfall days in January: 4.4 days
The month with the highest number of rainy days is July (13.3 days).
The month with the least rainy days is February (4.1 days).
Average snowfall in January
Summit, IL
- Average snowfall in January: 1.06"
The month with the highest snowfall is February (1.38").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in January
Summit, IL
- Average snowfall days in January: 10.1 days
The month with the highest number of snowfall days is January (10.1 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
Summit, 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 36min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in January
Summit, IL
- Average sunshine days in January: 18.8 days
The month with the most sunshine days is November (21.3 days).
The month with the least sunshine days is June (12.3 days).
Average UV index in January
Summit, IL
- Average UV index in January: 2
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in January
Summit, IL
- Average cloud cover in January: 60
The month with the most cloud cover is January (Cloud cover 60).
The month with the least cloud cover is August (Cloud cover 27).
Average visibility in January
Summit, 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).
Summit, Illinois, USA
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