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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
Climate and monthly weather forecast
Weather in January
January, like December, is a freezing cold winter month in Prospect Heights, Illinois, with temperature in the range of an average low of 18°F (-7.8°C) and an average high of 28.2°F (-2.1°C). The month of January, characterized by an average high of 28.2°F (-2.1°C) and a low of 18°F (-7.8°C), is recognized as the coldest. Weather in January »
Weather in February
The last month of the winter, February, is another freezing cold month in Prospect Heights, Illinois, with an average temperature fluctuating between 31.6°F (-0.2°C) and 20.5°F (-6.4°C). February commences with an average high-temperature of a still subzero cold 31.6°F (-0.2°C), showing little deviation from January's 28.2°F (-2.1°C). Weather in February »
Weather in March
The first month of the spring, March, is a frosty month in Prospect Heights, Illinois, with an average temperature ranging between max 43.5°F (6.4°C) and min 30.9°F (-0.6°C). In March, the meteorological conditions change with the average high-temperature moving 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). April's arrival signals an increase in average high-temperatures, moving from March's frosty 43.5°F (6.4°C) to a cool 54.3°F (12.4°C). Weather in April »
Weather in May
May, the last month of the spring in Prospect Heights, is a comfortable month, with an average temperature ranging between max 65.8°F (18.8°C) and min 50.5°F (10.3°C). The shift from April to May is marked by an increase in the average high-temperature, moving from a cool 54.3°F (12.4°C) to a refreshing 65.8°F (18.8°C). Weather in May »
Weather in June
The first month of the summer, June, is a warm month in Prospect Heights, Illinois, with an average temperature ranging between min 60.4°F (15.8°C) and max 75.9°F (24.4°C). June brings a temperature increase, with average high-temperatures moving from May's refreshing 65.8°F (18.8°C) to a moderately hot 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 temperature in the range of an average high of 81.1°F (27.3°C) and an average low of 66.4°F (19.1°C). July tends to be the warmest month, with temperatures averaging a daily high of 81.1°F (27.3°C) and a low of 66.4°F (19.1°C). The heat index value for July is evaluated at a hot 86°F (30°C). Weather in July »
Weather in August
August, the last month of the summer in Prospect Heights, is another warm month, with an average temperature fluctuating between 79.7°F (26.5°C) and 65.5°F (18.6°C). August's beginning signals an average high-temperature of a still moderately hot 79.7°F (26.5°C), barely different from July's 81.1°F (27.3°C). Weather in August »
Weather in September
The first month of the autumn, September, is also an agreeable month in Prospect Heights, Illinois, with temperature in the range of an average high of 73.2°F (22.9°C) and an average low of 58.8°F (14.9°C). September's onset introduces a mild reduction in the average high-temperature, 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, like September, is a moderate autumn month in Prospect Heights, Illinois, with an average temperature ranging between max 59.9°F (15.5°C) and min 46.4°F (8°C). Prospect Heights's weather in October involves a decrease in the average high-temperature, moving down from September's agreeable 73.2°F (22.9°C) to a mild 59.9°F (15.5°C). Weather in October »
Weather in November
The last month of the autumn, November, is another chilly month in Prospect Heights, Illinois, with temperature in the range of an average low of 34°F (1.1°C) and an average high of 45.5°F (7.5°C). Prospect Heights in November sees a clear temperature decline, with average high-temperatures decreasing from a refreshing 59.9°F (15.5°C) in October to a frosty 45.5°F (7.5°C). Weather in November »
Weather in December
December, the first month of the winter in Prospect Heights, is also an icy month, with an average temperature ranging between min 25°F (-3.9°C) and max 34.7°F (1.5°C). The start of December signals a decrease in the average high-temperature, transitioning from a frosty 45.5°F (7.5°C) in November to a wintry 34.7°F (1.5°C). Weather in December »
Updated: Aug 19, 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 part of the year is the coldest?
January is the coldest month, exhibiting average temperatures of 28.2°F (-2.1°C) at the peak and 18°F (-7.8°C) at the base.
What are the most humid months?
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?
Throughout the year, there are 153.3 rainfall days, and 30.12" (765mm) of precipitation is accumulated.
When does it snow in Prospect Heights?
January through May, October through December are months with snowfall.
When does it snow the most?
The month with the most snowfall 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, 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?
The month with the least sunshine is January, with an average of 3.7h of sunshine.
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 wettest month?
The month with the most rainfall is May, when the rain falls for 18 days and typically aggregates up to 3.9" (99mm) of precipitation.
When it does not snow?
June through September are months without snowfall in Prospect Heights.
When are the longest days?
The month with the longest days in Prospect Heights is June, with an average of 15h and 12min of daylight.
What are the months with the highest UV index?
The months with the highest UV index are June through August, with an average maximum UV index of 6.
What is the hottest time of year in Prospect Heights?
July, on average, is the warmest month, registering a high temperature of 81.1°F (27.3°C) and a low of 66.4°F (19.1°C).
What month has the most sunshine?
The month with the most sunshine in Prospect Heights, Illinois, is July, with an average of 10.2h of sunshine.
What is the least humid month?
The least humid month is October, with an average relative humidity of 72%.
What is the driest month?
December is the month with the least rainfall. Rain falls for 8.5 days and accumulates 1.46" (37mm) of precipitation.
What is the month with the shortest days in Prospect Heights?
The month with the shortest days is December, with an average of 9h and 12min of daylight.
When is the lowest UV index?
The month with the lowest UV index in Prospect Heights, Illinois, 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 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 3min - Average sunshine in May:
8h and 3min - 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 3min - 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).