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Contents
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average pressure
- Average wind speed
- Average humidity
- Average rainfall
- Average rainfall days
- Average snowfall
- Average snowfall days
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
Weather in January
January, the same as December, in Westchester, Illinois, is another subzero cold winter month, with an average temperature ranging between min 18°F (-7.8°C) and max 28.8°F (-1.8°C). In Westchester, the lowest average temperatures are observed in January, with a high of 28.8°F (-1.8°C) and a low of 18°F (-7.8°C). Weather in January »
Weather in February
The last month of the winter, February, is a wintry month in Westchester, Illinois, with an average temperature varying between 32.4°F (0.2°C) and 20.7°F (-6.3°C). Westchester records an average high-temperature of a cold 32.4°F (0.2°C) as February arrives, nearly mirroring the previous month's climate. Weather in February »
Weather in March
The first month of the spring, March, is a chilly month in Westchester, Illinois, with temperature in the range of an average low of 31.5°F (-0.3°C) and an average high of 44.2°F (6.8°C). The start of March brings a rise in the average high-temperature, moving from a cold 32.4°F (0.2°C) in February to a frosty 44.2°F (6.8°C). Weather in March »
Weather in April
April is a cool spring month in Westchester, Illinois, with an average temperature varying between 40.6°F (4.8°C) and 55.2°F (12.9°C). As Westchester transitions into April, the average high-temperature shows a change, moving from a chilly 44.2°F (6.8°C) in March to a fresh 55.2°F (12.9°C). Weather in April »
Weather in May
May, the last month of the spring in Westchester, is a refreshing month, with temperature in the range of an average low of 51.6°F (10.9°C) and an average high of 67.3°F (19.6°C). With the beginning of May, Westchester's average high-temperature sees an increase, transitioning from a fresh 55.2°F (12.9°C) in April to a comfortable 67.3°F (19.6°C). Weather in May »
Weather in June
The first month of the summer, June, is a warm month in Westchester, Illinois, with an average temperature ranging between max 76.8°F (24.9°C) and min 61.2°F (16.2°C). In June, the average high-temperature increases from a refreshing 67.3°F (19.6°C) in May to a warm 76.8°F (24.9°C). Weather in June »
Weather in July
July, like June, in Westchester, Illinois, is a moderately hot summer month, with an average temperature varying between 66.6°F (19.2°C) and 81.9°F (27.7°C). In Westchester, the month of July registers the highest temperatures, averaging 81.9°F (27.7°C) at the peak and 66.6°F (19.2°C) at the lowest. July's average heat index is evaluated at a tropical 87.8°F (31°C). Weather in July »
Weather in August
August, the last month of the summer in Westchester, is also a moderately hot month, with an average temperature varying between 65.7°F (18.7°C) and 80.2°F (26.8°C). The introduction of August sees an average high-temperature of a still warm 80.2°F (26.8°C), hardly deviating from July. Weather in August »
Weather in September
The first month of the autumn, September, is also a moderately hot month in Westchester, Illinois, with an average temperature fluctuating between 58.6°F (14.8°C) and 73.4°F (23°C). Westchester's weather subtly changes with the onset of September, barely falling from a warm 80.2°F (26.8°C) in August to a still moderately hot 73.4°F (23°C). Weather in September »
Weather in October
October, the same as September, in Westchester, Illinois, is another mild autumn month, with an average temperature ranging between min 46.6°F (8.1°C) and max 60.4°F (15.8°C). The beginning of October marks a decrease in the average high-temperature, transitioning from a moderately hot 73.4°F (23°C) in September to a mild 60.4°F (15.8°C). Weather in October »
Weather in November
November, the last month of the autumn in Westchester, is also a frosty month, with an average temperature fluctuating between 45.9°F (7.7°C) and 33.6°F (0.9°C). As November arrives, a noticeable drop in the average high-temperature is witnessed, moving from a moderate 60.4°F (15.8°C) in October to a frosty 45.9°F (7.7°C). Weather in November »
Weather in December
December, the first month of the winter in Westchester, is also a wintry month, with temperature in the range of an average low of 25.2°F (-3.8°C) and an average high of 34.7°F (1.5°C). The average high-temperature drops in December, from November's frosty 45.9°F (7.7°C) to a wintry 34.7°F (1.5°C). Weather in December »
[Resources]Frequently asked questions
What is the coldest month in Westchester?
January is Westchester's coldest month, registering average high temperatures of 28.8°F (-1.8°C) and lows of 18°F (-7.8°C).
What are the most humid months in Westchester?
January and February, with an average relative humidity of 82%, are most humid months in Westchester, Illinois.
How much does it rain in Westchester?
In Westchester, Illinois, during the entire year, the rain falls for 149.4 days and collects up to 25.08" (637mm) of precipitation.
When does it snow in Westchester?
January through May, October through December are months with snowfall in Westchester.
How much does it snow in Westchester?
Throughout the year, in Westchester, there are 45.8 snowfall days, and 14.25" (362mm) of snow is accumulated.
What is the month with the least sunshine in Westchester?
January has the least sunshine of the year in Westchester, Illinois, with an average of 3.7h of sunshine.
When is the lowest UV index in Westchester?
January and December, with an average maximum UV index of 1, are months with the lowest UV index in Westchester, Illinois.
When does it snow the most in Westchester?
February is the month with the most snowfall in Westchester. Snow falls for 10.9 days and accumulates 3.86" (98mm) of snow.
When is Daylight Saving Time (DST) in Westchester?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Westchester, Illinois, 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.
What is the rainiest month in Westchester?
May is the month with the most rainfall. Rain falls for 17.3 days and accumulates 3.11" (79mm) of precipitation.
When it does not snow in Westchester?
June through September are months without snowfall.
When are the longest days in Westchester?
With an average of 15h and 12min of daylight, June has the longest days of the year in Westchester.
When is the highest UV index in Westchester?
The months with the highest UV index in Westchester, Illinois, are June through August, with an average maximum UV index of 6.
What time of the year is the hottest in Westchester?
The average temperatures in Westchester reach their apex in July, averaging 81.9°F (27.7°C) at the high end and 66.6°F (19.2°C) at the low end.
What are the months with the most sunshine in Westchester?
July and August, with an average of 10.1h of sunshine, are months with the most sunshine in Westchester, Illinois.
What is the least humid month in Westchester?
The least humid month in Westchester, Illinois, is October, with an average relative humidity of 72%.
What is the driest month in Westchester?
December is the month with the least rainfall. Rain falls for 7.9 days and accumulates 1.14" (29mm) of precipitation.
What is the month with the shortest days in Westchester?
December has the shortest days of the year in Westchester, Illinois, with an average of 9h and 12min of daylight.
Average temperature
Westchester, IL
The warmest month (with the highest average high temperature) is July (81.9°F).
The month with the lowest average high temperature is January (28.8°F).
The month with the highest average low temperature is July (66.6°F).
The coldest month (with the lowest average low temperature) is January (18°F).
Average pressure
Westchester, IL
- Average pressure in January:
30.11"Hg - Average pressure in February:
30.1"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:
30.01"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
Westchester, IL
- Average wind speed in January:
10.2mph - Average wind speed in February:
9.9mph - Average wind speed in March:
9.4mph - Average wind speed in April:
9.7mph - Average wind speed in May:
8.3mph - Average wind speed in June:
7.3mph
- Average wind speed in July:
6.5mph - Average wind speed in August:
6.3mph - Average wind speed in September:
7.5mph - Average wind speed in October:
9.1mph - Average wind speed in November:
9.7mph - Average wind speed in December:
9.4mph
The windiest month (with the highest average wind speed) is January (10.2mph).
The calmest month (with the lowest average wind speed) is August (6.3mph).
Average humidity
Westchester, IL
The months with the highest relative humidity are January and February (82%).
The month with the lowest relative humidity is October (72%).
Average rainfall
Westchester, IL
- Average rainfall in January:
1.34" - Average rainfall in February:
1.42" - Average rainfall in March:
1.46" - Average rainfall in April:
2.76" - Average rainfall in May:
3.11" - Average rainfall in June:
2.83"
- Average rainfall in July:
2.87" - Average rainfall in August:
2.83" - Average rainfall in September:
1.89" - Average rainfall in October:
2.17" - Average rainfall in November:
1.26" - Average rainfall in December:
1.14"
The wettest month (with the highest rainfall) is May (3.11").
The driest month (with the least rainfall) is December (1.14").
Average rainfall days
Westchester, IL
- Average rainfall days in January:
6.3 days - Average rainfall days in February:
5.1 days - Average rainfall days in March:
11.3 days - Average rainfall days in April:
15.8 days - Average rainfall days in May:
17.3 days - Average rainfall days in June:
16.2 days
- Average rainfall days in July:
17.3 days - Average rainfall days in August:
16.6 days - Average rainfall days in September:
13.5 days - Average rainfall days in October:
13 days - Average rainfall days in November:
9.1 days - Average rainfall days in December:
7.9 days
The months with the highest number of rainy days are May and July (17.3 days).
The month with the least rainy days is February (5.1 days).
Average snowfall
Westchester, IL
- Average snowfall in January:
3.62" - Average snowfall in February:
3.86" - Average snowfall in March:
1.18" - Average snowfall in April:
2.01" - Average snowfall in May:
0.04" - Average snowfall in June:
0"
The month with the highest snowfall is February (3.86").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days
Westchester, IL
- Average snowfall days in January:
12.4 days - Average snowfall days in February:
10.9 days - Average snowfall days in March:
6.3 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:
0.4 days - Average snowfall days in November:
3.5 days - Average snowfall days in December:
9.9 days
The month with the highest number of snowfall days is January (12.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight / Average sunshine
Westchester, IL
- Average daylight in January:
9h and 3min - Average daylight in February:
10h and 4min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 2min - Average daylight in May:
14h and 4min - Average daylight in June:
15h and 1min
- Average daylight in July:
14h and 5min - Average daylight in August:
13h and 5min - Average daylight in September:
12h and 3min - Average daylight in October:
11h and 1min - Average daylight in November:
9h and 5min - Average daylight in December:
9h and 1min
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 - Average sunshine in February:
3h and 5min - Average sunshine in March:
6h and 0min - Average sunshine in April:
7h and 4min - Average sunshine in May:
8h and 4min - Average sunshine in June:
9h and 4min
- Average sunshine in July:
10h and 1min - Average sunshine in August:
10h and 1min - Average sunshine in September:
8h and 5min - Average sunshine in October:
5h and 4min - Average sunshine in November:
5h and 0min - Average sunshine in December:
4h and 1min
The months with the most sunshine are July and August (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days
Westchester, IL
- Average sunshine days in January:
14.2 days - Average sunshine days in February:
11.5 days - Average sunshine days in March:
13.8 days - Average sunshine days in April:
11 days - Average sunshine days in May:
10.8 days - Average sunshine days in June:
11.1 days
- Average sunshine days in July:
9.5 days - Average sunshine days in August:
11.3 days - Average sunshine days in September:
13 days - Average sunshine days in October:
14.2 days - Average sunshine days in November:
16.8 days - Average sunshine days in December:
15.3 days
The month with the most sunshine days is November (16.8 days).
The month with the least sunshine days is July (9.5 days).
Average UV index
Westchester, IL
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover
Westchester, IL
The month with the most cloud cover is January (Cloud cover 61).
The month with the least cloud cover is August (Cloud cover 30).
Average visibility
Westchester, 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).
Westchester, Illinois, USA
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