Union, IL Climate


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United States / Illinois / Chicago-Naperville-Elgin Metro Area / McHenry County / Union / Zip Codes
Union, IL has a humid continental climate, with hot summers and cooler winters. The average temperature in the summer months ranges from the mid 70s to the mid 80s, while in the winter months temperatures usually range from the low 30s to the low 50s. Precipitation levels are generally moderate throughout the year, averaging approximately 48 inches annually. Snowfall is also relatively common, with yearly averages reaching around 30 inches.

Union, Illinois gets 36 inches of rain, on average, per year. The US average is 38 inches of rain per year.

Union averages 32 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 186 sunny days per year in Union. The US average is 205 sunny days.

Union gets some kind of precipitation, on average, 112 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 83 degrees
Winter Low: the January low is 12
Rain: averages 36 inches of rain a year
Snow: averages 32 inches of snow a year

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for Union is 6.8 (10=best), which means it is less comfortable than most places in Illinois.

9 Summer - 4.4 Winter
June, September and August are the most pleasant months in Union, while January and December are the least comfortable months.

  ClimateUnion, IllinoisUnited States
  36.4 in.38.1 in.
  32.1 in.27.8 in.
  111.8 days106.2 days
  186 days205 days
  83.0°85.8°
  12.4°21.7°
  6.87
  3.44.3
  840 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 Union with an average high temperature of 83.0°, which ranks it as one of the coolest places in Illinois. In Union, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Union are June, August and September.
In Union, there are 11.1 days annually when the high temperature is over 90°, which is cooler than most places in Illinois.
January has the coldest nighttime temperatures for Union with an average of 12.4°. This is one of the coldest places in Illinois.
In Union, there are 140.8 days annually when the nighttime low temperature falls below freezing, which is one of the coldest places in Illinois.
In Union, there are 12.9 days annually when the nighttime low temperature falls below zero°, which is one of the coldest places in Illinois.
The humidity is usually comfortable in Union 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.
August is the wettest month in Union with 4.5 inches of rain, and the driest month is January with 1.5 inches. The wettest season is Autumn with 35% of yearly precipitation and 14% occurs in Spring, which is the driest season. The annual rainfall of 36.4 inches in Union means that it is one of the driest places in Illinois.
May is the rainiest month in Union with 11.5 days of rain, and February is the driest month with only 7.4 rainy days. There are 111.8 rainy days annually in Union, which is rainier than most places in Illinois. The rainiest season is Summer when it rains 28% of the time and the driest is Spring with only a 23% chance of a rainy day.
An annual snowfall of 32.1 inches in Union means that it is snowier than most places in Illinois. January is the snowiest month in Union with 9.3 inches of snow, and 6 months of the year have significant snowfall.
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