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
Winnetka reaches its lowest average temperatures in January, measuring 28.8°F (-1.8°C) at the peak and 18.9°F (-7.3°C) at the lowest.Humidity
The most humid month is January, with an average relative humidity of 82%.Rainfall
In Winnetka, in January, during 7.3 rainfall days, 1.77" (45mm) of precipitation is typically accumulated. Throughout the year, there are 164.7 rainfall days, and 35.28" (896mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through May, October through December. The month with the most snowfall is January, when snow falls for 13.1 days and typically aggregates up to 4.84" (123mm) of snow.Daylight
The average length of the day in January is 9h and 32min.On the first day of the month, sunrise is at 7:19 am and sunset at 4:29 pm. On the last day of January, sunrise is at 7:05 am and sunset at 5:03 pm CST.
Sunshine
With an average of 3.7h of sunshine, January has the least sunshine of the year.UV index
In Winnetka, the average daily maximum UV index in January is 2. A UV Index estimate of 2, and below, represents a low threat to health from exposure to the Sun's UV radiation for the average person.Note: In January, the UV index of 2 transforms into the following advice:
Children, babies, and those with sensitive skin should always be shielded from long periods of sun exposure. The most potent solar radiation is around mid-day, so one should minimize exposure to direct sunlight during this period. Employ a hat with a wide brim for robust protection, cutting UV exposure by half. Foresee this! The reflection from snow can nearly double the intensity of UV radiation from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the coldest time of year?
How cold is it in Winnetka in January?
What is the most humid month?
What is the average humidity in January?
How much does it rain in January?
What is the snowiest month?
How many days does it snow in January in Winnetka?
What is the average length of the day in January in Winnetka?
When are sunrise and sunset in January?
What is the month with the least sunshine?
How many hours of sunshine does Winnetka have in January?
How high is the UV index in January?
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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