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
January stands out as Winnetka's coldest month, with temperatures ranging between an average high of 28.8°F (-1.8°C) and a low of 18.9°F (-7.3°C).Humidity
With an average relative humidity of 82%, January is the most humid month.Rainfall
In Winnetka, Illinois, during January, the rain falls for 7.3 days and regularly aggregates up to 1.77" (45mm) of precipitation. In Winnetka, during the entire year, the rain falls for 164.7 days and collects up to 35.28" (896mm) of precipitation.Snowfall
January through May, October through December are months with snowfall. January is the month with the most snowfall in Winnetka. Snow falls for 13.1 days and accumulates 4.84" (123mm) of snow.Daylight
The average length of the day in January in Winnetka is 9h and 32min.On the first day of January, sunrise is at 7:19 am and sunset at 4:29 pm. On the last day of the month, sunrise is at 7:05 am and sunset at 5:03 pm CST.
Sunshine
January has the least sunshine of the year, with an average of 3.7h of sunshine.UV index
In Winnetka, Illinois, the average daily maximum UV index in January is 2. A UV Index reading of 2, and below, represents a low health risk from exposure to the Sun's UV radiation for the ordinary person.Note: In January, the maximum UV index of 2 suggests this advice:
Prolonged sun exposure should always be prevented in babies, children, and those with sensitive skin. Avoiding the Sun during its peak radiation time around midday is a healthy practice. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear. Take heed! Reflection from the snow can almost amplify the Sun's UV radiation by double.
Frequently asked questions
What is the coldest time of year in Winnetka?
How cold is it in Winnetka in January?
What is the most humid month in Winnetka?
What is the average humidity in January in Winnetka?
How much does it rain in Winnetka in January?
When does it snow the most in Winnetka?
How much does it snow in Winnetka in January?
What is the average length of the day in January in Winnetka?
What time are sunrise and sunset in January in Winnetka?
What is the month with the least sunshine in Winnetka?
How many hours of sunshine does Winnetka have in January?
What is the UV index intensity in January in Winnetka?
Average temperature in January
Winnetka, IL
- Average high temperature in January: 28.8°F
The warmest month (with the highest average high temperature) is July (79.2°F).
The month with the lowest average high temperature is January (28.8°F).
- Average low temperature in January: 18.9°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 (18.9°F).
Average pressure in January
Winnetka, 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
Winnetka, IL
- Average wind speed in January: 11.5mph
The windiest month (with the highest average wind speed) is January (11.5mph).
The calmest month (with the lowest average wind speed) is August (7.1mph).
Average humidity in January
Winnetka, IL
- Average humidity in January: 82%
The month with the highest relative humidity is January (82%).
The month with the lowest relative humidity is October (73%).
Average rainfall in January
Winnetka, IL
- Average rainfall in January: 1.77"
The wettest months (with the highest rainfall) are May and June (4.57").
The driest month (with the least rainfall) is December (1.65").
Average rainfall days in January
Winnetka, IL
- Average rainfall days in January: 7.3 days
The month with the highest number of rainy days is May (19.1 days).
The month with the least rainy days is February (6.1 days).
Average snowfall in January
Winnetka, IL
- Average snowfall in January: 4.84"
The month with the highest snowfall is January (4.84").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in January
Winnetka, IL
- Average snowfall days in January: 13.1 days
The month with the highest number of snowfall days is January (13.1 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in January /
Average sunshine in January
Winnetka, IL
- Average daylight in January: 9h and 3min
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 months with the most sunshine are July and August (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in January
Winnetka, IL
- Average sunshine days in January: 11.8 days
The month with the most sunshine days is November (15.5 days).
The month with the least sunshine days is June (9.2 days).
Average UV index in January
Winnetka, 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
Winnetka, IL
- Average cloud cover in January: 61
The month with the most cloud cover is January (Cloud cover 61).
The months with the least cloud cover are July and August (Cloud cover 28).
Average visibility in January
Winnetka, 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).
Winnetka, Illinois, USA
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