Harvey (IL) Climate by Month
Harvey experiences great temperature shifts.
The city's weather can transition from warm days
to very cold weather.
It also has a notably wet climate with much precipitation.
Now, let’s break down all the climate details for a clearer picture.
Average day and night temperature
The climate in Harvey is known for significant temperature differences throughout the year, making the weather dynamic. Average daytime temperatures range from a comfortable 29°C in July, the warmest time of the year, to a very cold 0°C during cooler months like January. At night, temperatures typically average around -8°C during these months.
The mean minimum and maximum temperatures throughout the year
Precipitation and rainy days
Harvey has a notably wet climate with abundant precipitation, recording 1060 mm of rain/snowfall per year. Significant seasonal changes in precipitation occur throughout the year. During the wetter season, August receives high rainfall, averaging 122 mm of precipitation, recorded across 11 rainy days. In contrast, the drier season, November brings less rainfall, with 54 mm over 8 rainy days.The mean monthly precipitation over the year, including rain, hail and snow
The average number of days each month with precipitation
Sunshine over the year
Seasonal changes in sunshine hours are quite dramatic in Harvey. While July receives considerable daily sunshine with up to 10.6 hours, December marks the darkest time of the year, where sunshine is scarce with only 3.6 hours of sunlight per day.Monthly hours of sunshine
Daily hours of sunshine
Daily percentage of sunshine
Average humidity
The relative humidity is low throughout the year in Harvey.
Relative humidity over the year
The best time of year to visit Harvey in the United States of America
During the months of May and September you are most likely to experience good weather with pleasant average temperatures that fall between 20°C and 26°C.Other facts from our historical weather data:
The hottest season / summer takes place in June, July, August and September.
July has an average maximum temperature of 29°C and is the warmest month of the year.
The coldest month is January with an average maximum temperature of 0°C.
August tops the wettest month list with 122 mm of rainfall.
November is the driest month with 54 mm of precipitation.
July is the sunniest month with an average of 319 hours of sunshine.
No idea where to travel to this year? We have a tool that recommends destinations based on your ideal conditions. Find out where to go with our weather planner.
