Climate and monthly weather forecastWinnetka, IL
Climate and monthly weather forecast
Weather in January
January, like December, is another subzero cold winter month in Winnetka, Illinois, with temperature in the range of an average low of 18.9°F (-7.3°C) and an average high of 28.8°F (-1.8°C). 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. Weather in January »Weather in February
February, the last month of the winter in Winnetka, is another freezing cold month, with an average temperature ranging between min 21.6°F (-5.8°C) and max 31.8°F (-0.1°C). Winnetka's weather in February, with an average high-temperature of a still subzero cold 31.8°F (-0.1°C), subtly shifts from January's 28.8°F (-1.8°C). Weather in February »Weather in March
March, the first month of the spring in Winnetka, is a wintry month, with temperature in the range of an average high of 42.3°F (5.7°C) and an average low of 31.5°F (-0.3°C). In Winnetka, stepping into March brings a temperature increase, moving up from February's subzero cold 31.8°F (-0.1°C) to a wintry 42.3°F (5.7°C). Weather in March »Weather in April
April is a cool spring month in Winnetka, Illinois, with an average temperature fluctuating between 39.7°F (4.3°C) and 52°F (11.1°C). Winnetka sees an increase in average high-temperatures during April, moving from an icy 42.3°F (5.7°C) in March to a cool 52°F (11.1°C). Weather in April »Weather in May
The last month of the spring, May, is an enjoyable month in Winnetka, Illinois, with an average temperature fluctuating between 50.4°F (10.2°C) and 62.8°F (17.1°C). May's onset brings a temperature rise, moving from a cool 52°F (11.1°C) in April to a comfortable 62.8°F (17.1°C). Weather in May »Weather in June
The first month of the summer, June, is a pleasant month in Winnetka, Illinois, with temperature in the range of an average low of 60.1°F (15.6°C) and an average high of 72.5°F (22.5°C). June's arrival signals an increase in average high-temperatures, moving from May's comfortable 62.8°F (17.1°C) to an agreeable 72.5°F (22.5°C). Weather in June »Weather in July
July in Winnetka, Illinois, is a moderately hot summer month, with an average temperature fluctuating between 67.1°F (19.5°C) and 79.2°F (26.2°C). In Winnetka, the peak temperatures are generally noted in July, averaging a high of 79.2°F (26.2°C) and a low of 67.1°F (19.5°C). Weather in July »Weather in August
August, the last month of the summer in Winnetka, is another warm month, with an average temperature varying between 78.1°F (25.6°C) and 66.9°F (19.4°C). The advent of August presents an average high-temperature of a still moderately hot 78.1°F (25.6°C), maintaining a close correlation with the preceding month. Weather in August »Weather in September
The first month of the autumn, September, is still a pleasant month in Winnetka, Illinois, with an average temperature fluctuating between 71.6°F (22°C) and 60.3°F (15.7°C). September sees a slight reduction in average high-temperature, with a shift from a warm 78.1°F (25.6°C) in August to a pleasant 71.6°F (22°C). Weather in September »Weather in October
October, like September, is another refreshing autumn month in Winnetka, Illinois, with an average temperature fluctuating between 59.5°F (15.3°C) and 47.7°F (8.7°C). As September shifts into October, a slight alteration in temperatures is observed, with average highs reducing from a pleasant 71.6°F (22°C) to a refreshing 59.5°F (15.3°C). Weather in October »Weather in November
November, the last month of the autumn in Winnetka, is another chilly month, with an average temperature ranging between min 35.1°F (1.7°C) and max 45.5°F (7.5°C). The arrival of November signals a shift in temperature, down from a mild 59.5°F (15.3°C) in October to a chilly 45.5°F (7.5°C). Weather in November »Weather in December
The first month of the winter, December, is still a cold month in Winnetka, Illinois, with an average temperature fluctuating between 34.9°F (1.6°C) and 26.1°F (-3.3°C). Winnetka's December weather shows a moderate shift in high-temperatures, falling from November's chilly 45.5°F (7.5°C) to a cold 34.9°F (1.6°C). Weather in December »Updated: Jul 14, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
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).
January is the most humid month, with an average relative humidity of 82%.
Throughout the year, in Winnetka, Illinois, there are 164.7 rainfall days, and 35.28" (896mm) of precipitation is accumulated.
January through May, October through December are months with snowfall.
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.
In Winnetka, during the entire year, snow falls for 47.6 days and aggregates up to 17.8" (452mm) of snow.
The month with the least sunshine in Winnetka is January, with an average of 3.7h of sunshine.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from CST to CDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from CDT to CST.
The months with the most rainfall are May and June, with an average 4.57" (116mm) of precipitation.
In Winnetka, snow does not fall in June through September.
The month with the longest days is June, with an average of 15h and 12min of daylight.
The months with the highest UV index are June through August, with an average maximum UV index of 6.
In Winnetka, the peak average temperatures are observed in July, with a high of 79.2°F (26.2°C) and a low of 67.1°F (19.5°C).
The months with the most sunshine are July and August, with an average of 10.4h of sunshine.
October is the least humid month, with an average relative humidity of 73%.
December is the month with the least rainfall. Rain falls for 9.1 days and accumulates 1.65" (42mm) of precipitation.
With an average of 9h and 12min of daylight, December has the shortest days of the year.
The month with the lowest UV index is December, with an average maximum UV index of 1.
Average temperature
Winnetka, IL
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).
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
Winnetka, IL
- Average pressure in January:
30.11"Hg - Average pressure in February:
30.09"Hg - Average pressure in March:
30.09"Hg - Average pressure in April:
29.95"Hg - Average pressure in May:
29.96"Hg - Average pressure in June:
29.92"Hg
- Average pressure in July:
29.97"Hg - Average pressure in August:
29.98"Hg - Average pressure in September:
30.03"Hg - Average pressure in October:
30"Hg - Average pressure in November:
30.09"Hg - Average pressure in December:
30.09"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
Winnetka, IL
- Average wind speed in January:
11.5mph - Average wind speed in February:
11.1mph - Average wind speed in March:
10.4mph - Average wind speed in April:
10.6mph - Average wind speed in May:
8.9mph - Average wind speed in June:
8mph
- Average wind speed in July:
7.3mph - Average wind speed in August:
7.1mph - Average wind speed in September:
8.6mph - Average wind speed in October:
10.3mph - Average wind speed in November:
11mph - Average wind speed in December:
10.7mph
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
Winnetka, IL
The month with the highest relative humidity is January (82%).
The month with the lowest relative humidity is October (73%).
Average rainfall
Winnetka, IL
- Average rainfall in January:
1.77" - Average rainfall in February:
1.85" - Average rainfall in March:
2.01" - Average rainfall in April:
3.78" - Average rainfall in May:
4.57" - Average rainfall in June:
4.57"
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
Winnetka, IL
- Average rainfall days in January:
7.3 days - Average rainfall days in February:
6.1 days - Average rainfall days in March:
12.2 days - Average rainfall days in April:
16.5 days - Average rainfall days in May:
19.1 days - Average rainfall days in June:
18.2 days
- Average rainfall days in July:
18.4 days - Average rainfall days in August:
17.7 days - Average rainfall days in September:
14.8 days - Average rainfall days in October:
14.5 days - Average rainfall days in November:
10.8 days - Average rainfall days in December:
9.1 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
Winnetka, IL
- Average snowfall in January:
4.84" - Average snowfall in February:
4.65" - Average snowfall in March:
1.22" - Average snowfall in April:
2.44" - Average snowfall in May:
0.08" - Average snowfall in June:
0"
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
Winnetka, IL
- Average snowfall days in January:
13.1 days - Average snowfall days in February:
11.2 days - Average snowfall days in March:
6.7 days - Average snowfall days in April:
2.3 days - Average snowfall days in May:
0.1 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
0.3 days - Average snowfall days in November:
3.9 days - Average snowfall days in December:
10 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 / Average sunshine
Winnetka, IL
- Average daylight in January:
9h and 30min - Average daylight in February:
10h and 36min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 24min - Average daylight in May:
14h and 36min - Average daylight in June:
15h and 12min
- Average daylight in July:
14h and 54min - Average daylight in August:
13h and 48min - Average daylight in September:
12h and 30min - Average daylight in October:
11h and 6min - Average daylight in November:
9h and 48min - Average daylight in December:
9h and 12min
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 42min - Average sunshine in February:
3h and 54min - Average sunshine in March:
6h and 6min - Average sunshine in April:
7h and 48min - Average sunshine in May:
8h and 42min - Average sunshine in June:
9h and 48min
- Average sunshine in July:
10h and 24min - Average sunshine in August:
10h and 24min - Average sunshine in September:
9h and 0min - Average sunshine in October:
5h and 42min - Average sunshine in November:
5h and 6min - Average sunshine in December:
4h and 0min
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
Winnetka, IL
- Average sunshine days in January:
11.8 days - Average sunshine days in February:
10.9 days - Average sunshine days in March:
13.3 days - Average sunshine days in April:
10.2 days - Average sunshine days in May:
10 days - Average sunshine days in June:
9.2 days
- Average sunshine days in July:
9.3 days - Average sunshine days in August:
10.5 days - Average sunshine days in September:
11.7 days - Average sunshine days in October:
13.4 days - Average sunshine days in November:
15.5 days - Average sunshine days in December:
14.3 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
Winnetka, IL
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
Winnetka, IL
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
Winnetka, IL
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).
