Climate and monthly weather forecastChicago Heights, IL
Climate and monthly weather forecast
Weather in January
January, the same as December, in Chicago Heights, Illinois, is another subzero cold winter month, with temperature in the range of an average low of 18.9°F (-7.3°C) and an average high of 29.7°F (-1.3°C). The lowest temperatures are recorded in January, with averages reaching a high of 29.7°F (-1.3°C) and a low of 18.9°F (-7.3°C). Weather in January »Weather in February
February, the last month of the winter in Chicago Heights, is an icy month, with an average temperature fluctuating between 33.1°F (0.6°C) and 21.2°F (-6°C). Chicago Heights's entry into February measures an average high-temperature of a wintry 33.1°F (0.6°C), closely parallel to the preceding month. Weather in February »Weather in March
The first month of the spring, March, is a chilly month in Chicago Heights, Illinois, with an average temperature ranging between min 32.4°F (0.2°C) and max 45.5°F (7.5°C). March's arrival coincides with a rise in the average high-temperature, moving from February's cold 33.1°F (0.6°C) to a chilly 45.5°F (7.5°C). Weather in March »Weather in April
April is a mild spring month in Chicago Heights, Illinois, with an average temperature fluctuating between 41.7°F (5.4°C) and 56.7°F (13.7°C). Chicago Heights sees a rise in temperature during April, with average high-temperatures transitioning from a chilly 45.5°F (7.5°C) in March to a mild 56.7°F (13.7°C). Weather in April »Weather in May
May, the last month of the spring in Chicago Heights, is an agreeable month, with temperature in the range of an average high of 68.7°F (20.4°C) and an average low of 52.3°F (11.3°C). Chicago Heights experiences a temperature shift with the start of May, with average high-temperatures moving from a refreshing 56.7°F (13.7°C) in April to an agreeable 68.7°F (20.4°C). Weather in May »Weather in June
June, the first month of the summer in Chicago Heights, is a warm month, with an average temperature varying between 77.7°F (25.4°C) and 61.7°F (16.5°C). Chicago Heights's weather shows a temperature rise with the arrival of June, moving from an agreeable 68.7°F (20.4°C) in May to a moderately hot 77.7°F (25.4°C). Weather in June »Weather in July
July, like June, in Chicago Heights, Illinois, is another warm summer month, with an average temperature varying between 65.8°F (18.8°C) and 81.3°F (27.4°C). Chicago Heights reaches its highest average temperatures in July, measuring 81.3°F (27.4°C) at the peak and 65.8°F (18.8°C) at the lowest. For most parts of July, the heat index is evaluated at a tropical 87.8°F (31°C). Weather in July »Weather in August
The last month of the summer, August, is also a moderately hot month in Chicago Heights, Illinois, with an average temperature fluctuating between 64.6°F (18.1°C) and 80.1°F (26.7°C). With the arrival of August, Chicago Heights's average high-temperature registers at a still warm 80.1°F (26.7°C), indicating a subtle variation from the previous month. Weather in August »Weather in September
September, the first month of the autumn in Chicago Heights, is still a warm month, with temperature in the range of an average high of 73.9°F (23.3°C) and an average low of 58.3°F (14.6°C). Chicago Heights's weather in September involves a mild decrease in the average high-temperature, moving down slightly from August's moderately hot 80.1°F (26.7°C) to a still warm 73.9°F (23.3°C). Weather in September »Weather in October
October, the same as September, is another enjoyable autumn month in Chicago Heights, Illinois, with an average temperature fluctuating between 61.2°F (16.2°C) and 46.9°F (8.3°C). Stepping into October, Chicago Heights observes a temperature decline, with the average high falling from September's warm 73.9°F (23.3°C) to a refreshing 61.2°F (16.2°C). Weather in October »Weather in November
The last month of the autumn, November, is also a frosty month in Chicago Heights, Illinois, with an average temperature fluctuating between 46.9°F (8.3°C) and 34.9°F (1.6°C). The beginning of November marks a decrease in the average high-temperature, transitioning from a refreshing 61.2°F (16.2°C) in October to a chilly 46.9°F (8.3°C). Weather in November »Weather in December
The first month of the winter, December, is still a cold month in Chicago Heights, Illinois, with an average temperature ranging between max 35.6°F (2°C) and min 25.9°F (-3.4°C). Chicago Heights's December weather features a mild decline in high-temperatures, reducing from a chilly 46.9°F (8.3°C) in November to a cold 35.6°F (2°C). Weather in December »Updated: Aug 20, 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
The coldest period is January, when temperatures fluctuate between an average high of 29.7°F (-1.3°C) and a low of 18.9°F (-7.3°C).
January and February, with an average relative humidity of 82%, are most humid months.
In Chicago Heights, during the entire year, the rain falls for 155.6 days and collects up to 31.3" (795mm) of precipitation.
January through April, October through December are months with snowfall.
The month with the most snowfall in Chicago Heights, Illinois, is January, when snow falls for 12.6 days and typically aggregates up to 4.53" (115mm) of snow.
In Chicago Heights, during the entire year, snow falls for 44.6 days and aggregates up to 16.46" (418mm) of snow.
The month with the least sunshine is January, with an average of 3.6h of sunshine.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Chicago Heights, 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 month with the most rainfall is May, when the rain falls for 17.4 days and typically aggregates up to 4.17" (106mm) of precipitation.
In Chicago Heights, snow does not fall in May through September.
June has the longest days of the year, with an average of 15h and 6min of daylight.
June and July, with an average maximum UV index of 6, are months with the highest UV index in Chicago Heights.
July tends to be the warmest month, with temperatures averaging a daily high of 81.3°F (27.4°C) and a low of 65.8°F (18.8°C).
The month with the most sunshine is August, with an average of 10.1h of sunshine.
The least humid month is October, with an average relative humidity of 73%.
The month with the least rainfall is December, when the rain falls for 7.9 days and typically collects 1.54" (39mm) of precipitation.
December has the shortest days of the year, with an average of 9h and 12min of daylight.
The month with the lowest UV index is December, with an average maximum UV index of 1.
Average temperature
Chicago Heights, IL
The warmest month (with the highest average high temperature) is July (81.3°F).
The month with the lowest average high temperature is January (29.7°F).
The month with the highest average low temperature is July (65.8°F).
The coldest month (with the lowest average low temperature) is January (18.9°F).
Average pressure
Chicago Heights, 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:
30.1"Hg - Average pressure in December:
30.1"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
Chicago Heights, IL
- Average wind speed in January:
10.2mph - Average wind speed in February:
9.9mph - Average wind speed in March:
9.5mph - Average wind speed in April:
9.8mph - Average wind speed in May:
8.3mph - Average wind speed in June:
7.4mph
- Average wind speed in July:
6.4mph - Average wind speed in August:
6.3mph - Average wind speed in September:
7.3mph - Average wind speed in October:
9.1mph - Average wind speed in November:
9.8mph - Average wind speed in December:
9.5mph
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
Chicago Heights, IL
The months with the highest relative humidity are January and February (82%).
The month with the lowest relative humidity is October (73%).
Average rainfall
Chicago Heights, IL
- Average rainfall in January:
1.77" - Average rainfall in February:
1.69" - Average rainfall in March:
2.09" - Average rainfall in April:
3.43" - Average rainfall in May:
4.17" - Average rainfall in June:
3.82"
- Average rainfall in July:
3.31" - Average rainfall in August:
2.56" - Average rainfall in September:
2.48" - Average rainfall in October:
2.76" - Average rainfall in November:
1.69" - Average rainfall in December:
1.54"
The wettest month (with the highest rainfall) is May (4.17").
The driest month (with the least rainfall) is December (1.54").
Average rainfall days
Chicago Heights, IL
- Average rainfall days in January:
6.8 days - Average rainfall days in February:
6.1 days - Average rainfall days in March:
12.7 days - Average rainfall days in April:
16.8 days - Average rainfall days in May:
17.4 days - Average rainfall days in June:
17.4 days
- Average rainfall days in July:
17.6 days - Average rainfall days in August:
14.8 days - Average rainfall days in September:
13.4 days - Average rainfall days in October:
14.3 days - Average rainfall days in November:
10.4 days - Average rainfall days in December:
7.9 days
The month with the highest number of rainy days is July (17.6 days).
The month with the least rainy days is February (6.1 days).
Average snowfall
Chicago Heights, IL
The month with the highest snowfall is January (4.53").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days
Chicago Heights, IL
- Average snowfall days in January:
12.6 days - Average snowfall days in February:
10.5 days - Average snowfall days in March:
6.1 days - Average snowfall days in April:
1.9 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:
4 days - Average snowfall days in December:
9.1 days
The month with the highest number of snowfall days is January (12.6 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight / Average sunshine
Chicago Heights, IL
- Average daylight in January:
9h and 36min - 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 30min - Average daylight in June:
15h and 6min
- Average daylight in July:
14h and 48min - 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 54min - Average daylight in December:
9h and 12min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in January:
3h and 36min - Average sunshine in February:
3h and 54min - Average sunshine in March:
6h and 0min - Average sunshine in April:
7h and 36min - Average sunshine in May:
8h and 36min - Average sunshine in June:
9h and 36min
- Average sunshine in July:
9h and 54min - Average sunshine in August:
10h and 6min - Average sunshine in September:
8h and 48min - Average sunshine in October:
5h and 54min - Average sunshine in November:
5h and 6min - Average sunshine in December:
4h and 0min
The month with the most sunshine is August (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).
Average sunshine days
Chicago Heights, IL
- Average sunshine days in January:
13 days - Average sunshine days in February:
11.8 days - Average sunshine days in March:
13.8 days - Average sunshine days in April:
10.2 days - Average sunshine days in May:
11.8 days - Average sunshine days in June:
10.4 days
- Average sunshine days in July:
11.1 days - Average sunshine days in August:
13.3 days - Average sunshine days in September:
14 days - Average sunshine days in October:
14.4 days - Average sunshine days in November:
16.4 days - Average sunshine days in December:
15 days
The month with the most sunshine days is November (16.4 days).
The month with the least sunshine days is April (10.2 days).
Average UV index
Chicago Heights, IL
The months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover
Chicago Heights, IL
The month with the most cloud cover is January (Cloud cover 62).
The month with the least cloud cover is August (Cloud cover 30).
Average visibility
Chicago Heights, IL
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).
