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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 fluctuating between 18°F (-7.8°C) and 28.8°F (-1.8°C). Westchester records the coldest temperatures in January, averaging 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 an icy month in Westchester, Illinois, with temperature in the range of an average low of 20.7°F (-6.3°C) and an average high of 32.4°F (0.2°C). February's presence marks an average high-temperature of a wintry 32.4°F (0.2°C), subtly varied from January's 28.8°F (-1.8°C). Weather in February »
Weather in March
March, the first month of the spring in Westchester, is a frosty month, with an average temperature varying between 31.5°F (-0.3°C) and 44.2°F (6.8°C). March's onset brings a rise in the average high-temperature, moving from a cold 32.4°F (0.2°C) in February to a chilly 44.2°F (6.8°C). Weather in March »
Weather in April
April in Westchester, Illinois, is a fresh spring month, with temperature in the range of an average high of 55.2°F (12.9°C) and an average low of 40.6°F (4.8°C). April's arrival brings a change in high-temperatures, 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
The last month of the spring, May, is an enjoyable month in Westchester, Illinois, with an average temperature varying between 67.3°F (19.6°C) and 51.6°F (10.9°C). Westchester sees a rise in temperature during May, with average high-temperatures 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
June, the first month of the summer in Westchester, is a warm month, with temperature in the range of an average high of 76.8°F (24.9°C) and an average low of 61.2°F (16.2°C). Westchester's transition into June is marked by a temperature shift, moving from an enjoyable 67.3°F (19.6°C) in May to a moderately hot 76.8°F (24.9°C). Weather in June »
Weather in July
July, the same as June, is another warm summer month in Westchester, Illinois, with an average temperature ranging between min 66.6°F (19.2°C) and max 81.9°F (27.7°C). July is the month when Westchester's temperatures reach their peak, with averages of 81.9°F (27.7°C) and lows of 66.6°F (19.2°C). The heat index for July is estimated at a hot 87.8°F (31°C). Weather in July »
Weather in August
August, the last month of the summer in Westchester, is another warm month, with temperature in the range of an average high of 80.2°F (26.8°C) and an average low of 65.7°F (18.7°C). The beginning of August records an average high-temperature of a still moderately hot 80.2°F (26.8°C), marking a negligible difference from July's 81.9°F (27.7°C). Weather in August »
Weather in September
The first month of the autumn, September, is still a warm month in Westchester, Illinois, with an average temperature varying between 58.6°F (14.8°C) and 73.4°F (23°C). With September's onset, the weather reveals a slight temperature decrease, transitioning 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, like September, is another mild autumn month in Westchester, Illinois, with an average temperature ranging between max 60.4°F (15.8°C) and min 46.6°F (8.1°C). In Westchester, the average high-temperature in October drops from a moderately hot 73.4°F (23°C) in September to a refreshing 60.4°F (15.8°C). Weather in October »
Weather in November
November, the last month of the autumn in Westchester, is another chilly month, with an average temperature varying between 33.6°F (0.9°C) and 45.9°F (7.7°C). A clear reduction in the average high-temperature is witnessed with the onset of November, reducing from a refreshing 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 an icy month, with an average temperature fluctuating between 34.7°F (1.5°C) and 25.2°F (-3.8°C). In Westchester, the average high-temperature in December drops from a chilly 45.9°F (7.7°C) in November to an icy 34.7°F (1.5°C). Weather in December »
Updated: Aug 24, 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
What is the coldest time of year?
In Westchester, January is known for its average lowest temperatures, reaching a high of 28.8°F (-1.8°C) and a low of 18°F (-7.8°C).
What is the most humid month?
The months with the highest humidity are January and February, with an average relative humidity of 82%.
How many days does it rain?
In Westchester, during the entire year, the rain falls for 149.4 days and collects up to 25.08" (637mm) of precipitation.
When does it snow?
Months with snowfall are January through May, October through December.
How many days does it snow?
In Westchester, during the entire year, snow falls for 45.8 days and aggregates up to 14.25" (362mm) of snow.
What is the month with the least sunshine?
The month with the least sunshine is January, with an average of 3.7h of sunshine.
What are the months with the lowest UV index?
The months with the lowest UV index are January and December, with an average maximum UV index of 1.
What is the snowiest month?
February is the month with the most snowfall. Snow falls for 10.9 days and accumulates 3.86" (98mm) of snow.
When is Daylight Saving Time (DST)?
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.
What is the rainiest month?
May is the month with the most rainfall in Westchester. Rain falls for 17.3 days and accumulates 3.11" (79mm) of precipitation.
When it does not snow?
June through September are months without snowfall in Westchester.
When are the longest days?
June has the longest days of the year, with an average of 15h and 12min of daylight.
When is the highest UV index?
June through August, with an average maximum UV index of 6, are months with the highest UV index.
What time of the year is the hottest?
With its average high temperature of 81.9°F (27.7°C) and a low of 66.6°F (19.2°C), July is regarded as the warmest month.
What are the months with the most sunshine?
July and August, with an average of 10.1h of sunshine, are months with the most sunshine.
What is the least humid month?
With an average relative humidity of 72%, October is the least humid month.
What is the driest month?
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?
December has the shortest days of the year, 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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