Average humidity in Prospect Heights (IL)
On this page you find more information about the monthly relative humidity over the year in Prospect Heights (Illinois), the United States of America.
Prospect Heights's humidity levels vary throughout the year. The highest levels occur in December, reaching 76% (high), while the lowest is recorded in May at 64%.
Throughout the year, the average humidity in Prospect Heights is 69%.
Humidity plays an important role in how temperatures are felt. During the warmest month, July, the maximum average temperature is around 29°C (84°F). Combined with high humidity during this period, the temperature can feel even warmer than the thermometer shows.
During the coldest month, January, the maximum average temperature is around -1°C (30°F). This period has high humidity. When winter temperatures are low and humidity is high, it can make the air feel even colder than it actually is. Check out our detailed temperature page for more information.
Prospect Heights Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Prospect Heights - and find the best time to visit.
Prospect Heights 3-Day Forecast
Temperature Rainfall Sunshine Humidity Wind Speed
See the full Prospect Heights climate overview or explore weather in the United States of America.
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