Best year time to visit Prospect Heights

General weather information about Prospect Heights

Average annual temperature is 13.6 °C

Absolute maximum temperature: 35.0 °C

Absolute minimum temperature: -12.9 °C

Number of sunny days: 186 days

Number of rainy days: 175 days

Number of snow days: 4 days

* Weather data for Prospect Heights United States is based on climate observations for 2026 year

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Absolute maximum temperature (°C)	18.1	18.3	17.5	30.1	29.3	34.7	34.8	32.3	35.0	28.2	20.6	16.0
Average daytime temperature (°C)	9.3	9.6	11.5	19.7	22.7	27.5	31.0	28.9	25.2	20.4	12.1	9.7
Average temperature (°C)	5.3	4.4	5.8	13.4	16.1	20.8	25.2	23.6	20.2	14.9	7.0	5.5
Average night temperature (°C)	1.8	-0.2	1.0	8.3	9.9	15.3	20.5	19.1	16.2	10.7	2.8	2.0
Absolute minimum temperature (°C)	-3.6	-12.9	-3.9	-0.1	4.0	9.9	17.1	15.4	10.4	5.2	-4.2	-4.8

The best time to visit Prospect Heights during the most sunny months:

The largest precipitation sum in Prospect Heights is at

July — 151(mm)

August — 143(mm)

September — 180(mm)

December — 181(mm)

When is the best time to visit Prospect Heights?

The historical weather data above shows the warmest, sunniest and driest months to help you choose the best time to visit Prospect Heights.

What is the weather like in Prospect Heights?

See average temperature, rainfall and daylight hours for Prospect Heights by month in the table above.

How many sunny days does Prospect Heights have?

The monthly weather statistics above show sunshine and rainfall patterns for Prospect Heights throughout the year.