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, like December, is another subzero cold winter month in Prospect Heights, Illinois, with an average temperature fluctuating between 28.2°F (-2.1°C) and 18°F (-7.8°C). The coldest month is January, with an average high-temperature of 28.2°F (-2.1°C) and an average low-temperature of 18°F (-7.8°C). Weather in January »
Weather in February
The last month of the winter, February, is also a subzero cold month in Prospect Heights, Illinois, with an average temperature fluctuating between 20.5°F (-6.4°C) and 31.6°F (-0.2°C). In Prospect Heights, Illinois, the average high-temperature in February is essentially the same as in January - a still subzero cold 31.6°F (-0.2°C). Weather in February »
Weather in March
March, the first month of the spring in Prospect Heights, is a chilly month, with an average temperature varying between 30.9°F (-0.6°C) and 43.5°F (6.4°C). In Prospect Heights, Illinois, the average high-temperature in March rises from a subzero cold 31.6°F (-0.2°C) in February to a chilly 43.5°F (6.4°C). Weather in March »
Weather in April
April in Prospect Heights, Illinois, is a fresh spring month, with an average temperature varying between 54.3°F (12.4°C) and 40.1°F (4.5°C). In April, the average high-temperature rises from a chilly 43.5°F (6.4°C) in March to a fresh 54.3°F (12.4°C). Weather in April »
Weather in May
May, the last month of the spring in Prospect Heights, is an enjoyable month, with an average temperature ranging between min 50.5°F (10.3°C) and max 65.8°F (18.8°C). In Prospect Heights, the average high-temperature in May rises from a fresh 54.3°F (12.4°C) in April to a comfortable 65.8°F (18.8°C). Weather in May »
Weather in June
June, the first month of the summer in Prospect Heights, is a warm month, with an average temperature fluctuating between 75.9°F (24.4°C) and 60.4°F (15.8°C). In June, the average high-temperature rises from a comfortable 65.8°F (18.8°C) in May to a warm 75.9°F (24.4°C). Weather in June »
Weather in July
July, the same as June, is another warm summer month in Prospect Heights, Illinois, with an average temperature ranging between min 66.4°F (19.1°C) and max 81.1°F (27.3°C). The warmest month is July, with an average high-temperature of 81.1°F (27.3°C) and an average low-temperature of 66.4°F (19.1°C). In July, the average heat index is calculated to be a tropical 86°F (30°C). Weather in July »
Weather in August
August, the last month of the summer in Prospect Heights, is also a moderately hot month, with temperature in the range of an average high of 79.7°F (26.5°C) and an average low of 65.5°F (18.6°C). In August, the average high-temperature is practically the same as in July - a still moderately hot 79.7°F (26.5°C). Weather in August »
Weather in September
September, the first month of the autumn in Prospect Heights, is still a pleasant month, with an average temperature varying between 73.2°F (22.9°C) and 58.8°F (14.9°C). In September, the average high-temperature slightly decreases from a warm 79.7°F (26.5°C) in August to a pleasant 73.2°F (22.9°C). Weather in September »
Weather in October
October, the same as September, in Prospect Heights, Illinois, is a moderate autumn month, with an average temperature fluctuating between 46.4°F (8°C) and 59.9°F (15.5°C). In Prospect Heights, the average high-temperature in October decreases from a pleasant 73.2°F (22.9°C) in September to a mild 59.9°F (15.5°C). Weather in October »
Weather in November
November, the last month of the autumn in Prospect Heights, is also a frosty month, with an average temperature fluctuating between 45.5°F (7.5°C) and 34°F (1.1°C). In Prospect Heights, the average high-temperature in November significantly decreases from a moderate 59.9°F (15.5°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 also a wintry month in Prospect Heights, Illinois, with temperature in the range of an average high of 34.7°F (1.5°C) and an average low of 25°F (-3.9°C). In Prospect Heights, the average high-temperature in December drops from a chilly 45.5°F (7.5°C) in November to a cold 34.7°F (1.5°C). Weather in December »
[Resources]FAQ
What is the coldest month in Prospect Heights?
January is the coldest month, with an average high-temperature of 28.2°F (-2.1°C) and an average low-temperature of 18°F (-7.8°C).
What is the most humid month in Prospect Heights?
The months with the highest humidity in Prospect Heights are January and February, with an average relative humidity of 82%.
How many days does it rain in Prospect Heights?
In Prospect Heights, during the entire year, the rain falls for 153.3 days and collects up to 30.12" (765mm) of precipitation.
When does it snow in Prospect Heights?
Months with snowfall are January through May, October through December.
What is the snowiest month in Prospect Heights?
The month with the most snowfall in Prospect Heights, Illinois, is January, when snow falls for 11.8 days and typically aggregates up to 4.96" (126mm) of snow.
How much does it snow in Prospect Heights?
In Prospect Heights, Illinois, during the entire year, snow falls for 43.6 days and aggregates up to 17.95" (456mm) of snow.
What is the month with the least sunshine in Prospect Heights?
With an average of 3.7h of sunshine, January has the least sunshine of the year.
When is Daylight Saving Time (DST) in Prospect Heights?
On Sunday, March 12. 2023, at 2:00 am, Daylight Saving Time starts, and the time zone changes from CST to CDT. Daylight Saving Time ends Sunday, November 5. 2023, at 2:00 am, and the time zone reverts from CDT to CST.
What is the wettest month in Prospect Heights?
The month with the most rainfall in Prospect Heights, Illinois, is May, when the rain falls for 18 days and typically aggregates up to 3.9" (99mm) of precipitation.
When it does not snow in Prospect Heights?
June through September are months without snowfall.
When are the longest days in Prospect Heights?
June has the longest days of the year in Prospect Heights, Illinois, with an average of 15h and 12min of daylight.
When is the highest UV index in Prospect Heights?
The months with the highest UV index are June through August, with an average maximum UV index of 6.
What is the warmest month in Prospect Heights?
With an average high-temperature of 81.1°F (27.3°C) and an average low-temperature of 66.4°F (19.1°C), July is the warmest month.
What month has the most sunshine in Prospect Heights?
The month with the most sunshine is July, with an average of 10.2h of sunshine.
What is the least humid month in Prospect Heights?
October is the least humid month in Prospect Heights, with an average relative humidity of 72%.
What is the driest month in Prospect Heights?
The month with the least rainfall in Prospect Heights, Illinois, is December, when the rain falls for 8.5 days and typically collects 1.46" (37mm) of precipitation.
What is the month with the shortest days in Prospect Heights?
With an average of 9h and 10min of daylight, December has the shortest days of the year.
When is the lowest UV index in Prospect Heights?
The month with the lowest UV index in Prospect Heights is December, with an average maximum UV index of 1.
Average temperature
Prospect Heights, IL
The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (28.2°F).
The month with the highest average low temperature is July (66.4°F).
The coldest month (with the lowest average low temperature) is January (18°F).
Average pressure
Prospect 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"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
Prospect Heights, IL
- Average wind speed in January:
10.4mph - Average wind speed in February:
10.2mph - Average wind speed in March:
9.7mph - Average wind speed in April:
9.9mph - Average wind speed in May:
8.4mph - Average wind speed in June:
7.5mph
- Average wind speed in July:
6.7mph - Average wind speed in August:
6.5mph - Average wind speed in September:
7.7mph - Average wind speed in October:
9.3mph - Average wind speed in November:
9.9mph - Average wind speed in December:
9.7mph
The windiest month (with the highest average wind speed) is January (10.4mph).
The calmest month (with the lowest average wind speed) is August (6.5mph).
Average humidity
Prospect Heights, 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
Prospect Heights, IL
- Average rainfall in January:
1.65" - Average rainfall in February:
1.61" - Average rainfall in March:
1.85" - Average rainfall in April:
3.54" - Average rainfall in May:
3.9" - Average rainfall in June:
3.66"
- Average rainfall in July:
3.15" - Average rainfall in August:
2.87" - Average rainfall in September:
2.24" - Average rainfall in October:
2.6" - Average rainfall in November:
1.57" - Average rainfall in December:
1.46"
The wettest month (with the highest rainfall) is May (3.9").
The driest month (with the least rainfall) is December (1.46").
Average rainfall days
Prospect Heights, IL
- Average rainfall days in January:
7 days - Average rainfall days in February:
5.6 days - Average rainfall days in March:
11 days - Average rainfall days in April:
16 days - Average rainfall days in May:
18 days - Average rainfall days in June:
17.2 days
- Average rainfall days in July:
17.7 days - Average rainfall days in August:
15.7 days - Average rainfall days in September:
13.2 days - Average rainfall days in October:
13.9 days - Average rainfall days in November:
9.5 days - Average rainfall days in December:
8.5 days
The month with the highest number of rainy days is May (18 days).
The month with the least rainy days is February (5.6 days).
Average snowfall
Prospect Heights, IL
- Average snowfall in January:
4.96" - Average snowfall in February:
4.41" - Average snowfall in March:
1.38" - Average snowfall in April:
2.52" - Average snowfall in May:
0.08" - Average snowfall in June:
0"
The month with the highest snowfall is January (4.96").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days
Prospect Heights, IL
- Average snowfall days in January:
11.8 days - Average snowfall days in February:
10.2 days - Average snowfall days in March:
5.8 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:
0.5 days - Average snowfall days in November:
3.8 days - Average snowfall days in December:
9.5 days
The month with the highest number of snowfall days is January (11.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight / Average sunshine
Prospect Heights, IL
- Average daylight in January:
9h and 32min - Average daylight in February:
10h and 37min - Average daylight in March:
11h and 58min - Average daylight in April:
13h and 23min - Average daylight in May:
14h and 35min - Average daylight in June:
15h and 12min
- Average daylight in July:
14h and 53min - Average daylight in August:
13h and 50min - Average daylight in September:
12h and 28min - Average daylight in October:
11h and 4min - Average daylight in November:
9h and 49min - Average daylight in December:
9h and 10min
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 10min).
- Average sunshine in January:
3h and 42min - Average sunshine in February:
3h and 54min - Average sunshine in March:
6h and 0min - Average sunshine in April:
7h and 30min - Average sunshine in May:
8h and 30min - Average sunshine in June:
9h and 42min
- Average sunshine in July:
10h and 12min - Average sunshine in August:
10h and 6min - Average sunshine in September:
8h and 48min - Average sunshine in October:
5h and 30min - Average sunshine in November:
5h and 0min - Average sunshine in December:
4h and 0min
The month with the most sunshine is July (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days
Prospect Heights, IL
- Average sunshine days in January:
13.6 days - Average sunshine days in February:
12.3 days - Average sunshine days in March:
14.3 days - Average sunshine days in April:
10.8 days - Average sunshine days in May:
11 days - Average sunshine days in June:
10.7 days
- Average sunshine days in July:
11.2 days - Average sunshine days in August:
12.4 days - Average sunshine days in September:
14.1 days - Average sunshine days in October:
14.9 days - Average sunshine days in November:
16.3 days - Average sunshine days in December:
15.7 days
The month with the most sunshine days is November (16.3 days).
The month with the least sunshine days is June (10.7 days).
Average UV index
Prospect Heights, 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
Prospect Heights, IL
The month with the most cloud cover is January (Cloud cover 61).
The month with the least cloud cover is August (Cloud cover 29).
Average visibility
Prospect Heights, 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).
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