Prospect Heights, IL Climate


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United States / Illinois / Chicago-Naperville-Elgin Metro Area / Cook County / Prospect Heights / Zip Codes
Prospect Heights, IL is located within the humid continental climate zone. Summers in Prospect Heights tend to be hot and humid with temperatures often reaching into the high 80s and 90s while winters can be cold with temperatures frequently dipping below freezing. Precipitation is evenly spread throughout the year, with an average of 32 inches annually. Snowfall in Prospect Heights usually falls between November and March.

Prospect Heights, Illinois gets 36 inches of rain, on average, per year. The US average is 38 inches of rain per year.

Prospect Heights averages 36 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 187 sunny days per year in Prospect Heights. The US average is 205 sunny days.

Prospect Heights gets some kind of precipitation, on average, 125 days per year. Precipitation is rain, snow, sleet, or hail that falls to the ground. In order for precipitation to be counted you have to get at least .01 inches on the ground to measure.

Weather Highlights

Summer High: the July high is around 83 degrees
Winter Low: the January low is 17
Rain: averages 36 inches of rain a year
Snow: averages 36 inches of snow a year

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for Prospect Heights is 6.9 (10=best), which means it is less comfortable than most places in Illinois.

9.1 Summer - 4.5 Winter
June, September and August are the most pleasant months in Prospect Heights, while January and December are the least comfortable months.

  ClimateProspect Heights, IllinoisUnited States
  36.2 in.38.1 in.
  36.0 in.27.8 in.
  125.3 days106.2 days
  187 days205 days
  83.1°85.8°
  16.7°21.7°
  6.97
  3.64.3
  669 ft.2443 ft.
Climate
YOU SHOULD KNOW

Many people confuse weather and climate but they are different. Weather is the conditions of the atmosphere over a short period of time, and climate is how the atmosphere is over long periods of time.

Weather is how the atmosphere is behaving and its effects upon life and human activities. Weather can change from minute-to-minute. Most people think of weather in terms of temperature, humidity, precipitation, cloudiness, brightness, visibility, wind, and atmospheric pressure.

Climate is the description of the long-term pattern of weather in a place. Climate can mean the average weather for a particular region and time period taken over 30 years. Climate is the average of weather over time.

July is the hottest month for Prospect Heights with an average high temperature of 83.1°, which ranks it as one of the coolest places in Illinois. In Prospect Heights, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Prospect Heights are June, September and August.
In Prospect Heights, there are 13.8 days annually when the high temperature is over 90°, which is cooler than most places in Illinois.
January has the coldest nighttime temperatures for Prospect Heights with an average of 16.7°. This is about average compared to other places in Illinois.
In Prospect Heights, there are 122.8 days annually when the nighttime low temperature falls below freezing, which is about average compared to other places in Illinois.
In Prospect Heights, there are 6.2 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in Illinois.
The humidity is usually comfortable in Prospect Heights but some summer months can be sticky or muggy. July is the most humid month, though humidity is low for most of the year. The most humid months are July, August and June.
August is the wettest month in Prospect Heights with 4.3 inches of rain, and the driest month is February with 1.6 inches. The wettest season is Autumn with 32% of yearly precipitation and 15% occurs in Spring, which is the driest season. The annual rainfall of 36.2 inches in Prospect Heights means that it is one of the driest places in Illinois.
April is the rainiest month in Prospect Heights with 12.2 days of rain, and February is the driest month with only 8.3 rainy days. There are 125.3 rainy days annually in Prospect Heights, which is one of the rainiest places in Illinois. The rainiest season is Summer when it rains 28% of the time and the driest is Spring with only a 23% chance of a rainy day.
An annual snowfall of 36.0 inches in Prospect Heights means that it is one of the snowiest places in Illinois. January is the snowiest month in Prospect Heights with 11.3 inches of snow, and 6 months of the year have significant snowfall.
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