Mount Prospect (IL) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Mount Prospect.
Climate overview of Mount Prospect
Mount Prospect, Illinois, United States of America, experiences significant temperature variation throughout the year. Summers bring daytime highs of 29°C (84°F) in July, while winters cool to -1°C (30°F) in January.
The city has a wet climate, receiving around 1045 mm (41 in) of rain/snowfall per year. June is the wettest month. July is the sunniest month, averaging 10.6 hours of sunshine per day.
Mount Prospect Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Mount Prospect — and find the best time to visit.
Monthly Temperature in Mount Prospect
Depending on the time of the year, temperatures range from comfortable to very cold in Mount Prospect. On average, daytime temperatures range from a comfortable 29°C (84°F) in July to a very cold -1°C (30°F) in January.
Nighttime temperatures range from 18°C (64°F) in July to -9°C (16°F) in January.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Mount Prospect
Mount Prospect has a relatively rain/snowy climate with high precipitation levels, averaging 1045 mm (41 in) of rain/snowfall annually. The seasons in Mount Prospect bring significant changes in precipitation. The wettest month, June, receives high rainfall, with an average of 123 mm (4.8 in) of precipitation. This rainfall is distributed across 14 rainy days.
In contrast, the driest month, January, experiences much less snowfall, totaling 47 mm (1.9 in) over 10 snowy days. These distinct seasonal differences provide diverse experiences throughout the year. For more details, please visit our Mount Prospect Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Sunshine Hours in Mount Prospect
In Mount Prospect, summer days are longer and more sunny, with daily sunshine hours peaking at 10.6 hours in July. As the darker season arrives, the brightness of the sun becomes less. December sees a soft sun for only 3.6 hours per average day.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Daily percentage of sunshine
Humidity in Mount Prospect by Month
The relative humidity is high throughout the year in Mount Prospect.
The city experiences its highest humidity in December, reaching 76%. In May, the humidity drops to its lowest level at 64%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Wind Speed in Mount Prospect
The average wind speed over the year ranges from 4 m/s (8 knots) to 6 m/s (12 knots). It is lower in June, July, August and September and higher in January, March and April. What does this mean?
The mean monthly wind speed over the year (meters per second)
Best Time to Visit Mount Prospect
Rainfall during this time ranges from 99 mm (3.9 in) in September to 123 mm (4.8 in) in June. This means you can expect a mix of sunny days and occasional showers. Need help choosing your next travel destination? We offer a specialized tool that matches you with locations based on your weather preferences. Explore destinations that suit your climate preferences.
Frequently asked questions about the climate in Mount Prospect
What is the best time to visit Mount Prospect?
September typically offers the most optimal weather in Mount Prospect. In contrast, January, February, March, November and December tend to have less optimal conditions.
What temperatures can I expect in Mount Prospect?
Daytime highs range from -1°C (30°F) in January to 29°C (84°F) in July. Nighttime lows range from -9°C (16°F) to 18°C (64°F). Temperatures vary considerably through the year.
How much rain does Mount Prospect get?
Annual rainfall is around 1045 mm (41 in). June is the wettest month with 123 mm (4.8 in), while January is the driest with 47 mm (1.9 in).
How sunny is Mount Prospect?
Mount Prospect receives around 2,509 hours of sunshine per year. July is the sunniest month with 319 hours, while December is the cloudiest with just 107 hours. Overall, Mount Prospect enjoys abundant sunshine.
Mount Prospect 3-Day Forecast
Mount Prospect (IL) 3-Day Forecast
Mount Prospect on the map
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