Hamilton County, IL Climate

Hamilton, IL County has a humid continental climate with hot summers and cold winters. In the summer months, temperatures average in the mid-80s Fahrenheit with occasional spikes up to 95°F or higher. Winters are generally mild with temperatures averaging in the upper-30s but occasionally dropping down to near 0°F. Precipitation is evenly distributed throughout the year, with snowfall during winter months typically totaling around 12 inches annually. The county also gets a fair amount of sunshine year round, averaging about 2200 hours of sun per year.

Hamilton County, Illinois gets 46 inches of rain, on average, per year. The US average is 38 inches of rain per year.

Hamilton County averages 10 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 201 sunny days per year in Hamilton County. The US average is 205 sunny days.

Hamilton County gets some kind of precipitation, on average, 105 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 88 degrees
Winter Low: the January low is 23
Rain: averages 46 inches of rain a year
Snow: averages 10 inches of snow a year

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for Hamilton County is 7.2 (10=best), which means it is one of the most pleasant places in Illinois.

7.6 Summer - 5.7 Winter

September, May and October are the most pleasant months in Hamilton County, while January and December are the least comfortable months.

Climate	Hamilton, Illinois	United States
	Unlock	38.1 in.
	9.9 in.	Unlock
	Unlock	106.2 days
	201 days	Unlock
	88.1°	85.8°
	Unlock	21.7°
	7.2	Unlock
	Unlock	4.3
	440 ft.	Unlock

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 Hamilton County with an average high temperature of 88.1°, which ranks it as warmer than most places in Illinois. In Hamilton County, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Hamilton County are May, September and June.

In Hamilton County, there are 34.3 days annually when the high temperature is over 90°, which is hotter than most places in Illinois.

January has the coldest nighttime temperatures for Hamilton County with an average of 22.5°. This is one of the warmest places in Illinois.

In Hamilton County, there are 98.7 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Illinois.

In Hamilton County, there are 2.1 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in Illinois.

The humidity can be uncomfortably heavy or close in Hamilton County during the summer months. July is the most humid month, though humidity is low for most of the year. July, August and June are the three most humid months in Hamilton County.

May is the wettest month in Hamilton County with 5.4 inches of rain, and the driest month is January with 3.0 inches. The wettest season is Summer with 31% of yearly precipitation and 21% occurs in Spring, which is the driest season. The annual rainfall of 45.6 inches in Hamilton County means that it is one of the wettest places in Illinois.

May is the rainiest month in Hamilton County with 11.0 days of rain, and September is the driest month with only 6.9 rainy days. There are 105.4 rainy days annually in Hamilton County, which is about average compared to other places in Illinois. The rainiest season is Summer when it rains 31% of the time and the driest is Autumn with only a 22% chance of a rainy day.

An annual snowfall of 9.9 inches in Hamilton County means that it is one of the least snowy places in Illinois. February is the snowiest month in Hamilton County with 3.1 inches of snow, and 4 months of the year have significant snowfall.

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