LaSalle, IL Climate


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United States / Illinois / No Metro Area / LaSalle County / LaSalle / Zip Codes
LaSalle, IL has a humid continental type climate with hot summers and cold winters. It is characterized by warm to hot temperatures in the summer months of June to August, with average highs reaching into the mid-80s. Winters are much colder with below freezing temperatures from December to February and occasional snowfall. Spring and fall are milder seasons which bring about pleasant weather for outdoor activities. The area gets an average of 35 inches of rainfall each year, often concentrated in spring and summer months.

LaSalle, Illinois gets 37 inches of rain, on average, per year. The US average is 38 inches of rain per year.

LaSalle averages 22 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 191 sunny days per year in LaSalle. The US average is 205 sunny days.

LaSalle gets some kind of precipitation, on average, 115 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 85 degrees
Winter Low: the January low is 14
Rain: averages 37 inches of rain a year
Snow: averages 22 inches of snow a year

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for LaSalle is 7.0 (10=best), which means it is about average compared to other places in Illinois.

8.8 Summer - 4.7 Winter
June, September and August are the most pleasant months in LaSalle, while January and December are the least comfortable months.

  ClimateLaSalle, IllinoisUnited States
  36.9 in.38.1 in.
  22.1 in.27.8 in.
  115.1 days106.2 days
  191 days205 days
  85.1°85.8°
  14.2°21.7°
  77
  3.84.3
  571 ft.2443 ft.
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 LaSalle with an average high temperature of 85.1°, which ranks it as about average compared to other places in Illinois. In LaSalle, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for LaSalle are September, June and May.
In LaSalle, there are 18.2 days annually when the high temperature is over 90°, which is about average compared to other places in Illinois.
January has the coldest nighttime temperatures for LaSalle with an average of 14.2°. This is colder than most places in Illinois.
In LaSalle, there are 131.2 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Illinois.
In LaSalle, there are 10.4 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Illinois.
The humidity is usually comfortable in LaSalle but some summer months can be sticky or muggy. July is the most humid month, though humidity is low for most of the year. The most humid months are July, August and June.
May is the wettest month in LaSalle with 4.3 inches of rain, and the driest month is January with 1.6 inches. The wettest season is Autumn with 32% of yearly precipitation and 15% occurs in Spring, which is the driest season. The annual rainfall of 36.9 inches in LaSalle means that it is drier than most places in Illinois.
May is the rainiest month in LaSalle with 11.5 days of rain, and February is the driest month with only 7.6 rainy days. There are 115.1 rainy days annually in LaSalle, which is rainier than most places in Illinois. The rainiest season is Summer when it rains 29% of the time and the driest is Spring with only a 23% chance of a rainy day.
An annual snowfall of 22.1 inches in LaSalle means that it is about average compared to other places in Illinois. January is the snowiest month in LaSalle with 7.6 inches of snow, and 5 months of the year have significant snowfall.
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