Mendon, IL Climate


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United States / Illinois / Quincy Metro Area / Adams County / Mendon / Zip Codes
Mendon, IL has a humid continental climate with hot summers and cold winters. During the summer months, temperatures are typically in the mid-80s Fahrenheit, while during winter, temperatures usually average around 20-30 degrees Fahrenheit. The area also receives an average of 38 inches of rainfall throughout the year and experiences all four seasons. Snowfall is common during winter months and can often linger until late spring. Despite this, mild temperatures make Mendon a great place to be during any season.

Mendon, Illinois gets 39 inches of rain, on average, per year. The US average is 38 inches of rain per year.

Mendon averages 18 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 200 sunny days per year in Mendon. The US average is 205 sunny days.

Mendon gets some kind of precipitation, on average, 99 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 86 degrees
Winter Low: the January low is 17
Rain: averages 39 inches of rain a year
Snow: averages 18 inches of snow a year

Bestplaces Comfort Index

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

8.4 Summer - 5.3 Winter
September, June and May are the most pleasant months in Mendon, while January and February are the least comfortable months.

  ClimateMendon, IllinoisUnited States
  38.8 in.38.1 in.
  17.8 in.27.8 in.
  99.3 days106.2 days
  200 days205 days
  86.0°85.8°
  17.3°21.7°
  7.27
  3.84.3
  761 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 Mendon with an average high temperature of 86.0°, which ranks it as about average compared to other places in Illinois. In Mendon, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Mendon are September, June and May.
In Mendon, there are 20.8 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 Mendon with an average of 17.3°. This is about average compared to other places in Illinois.
In Mendon, there are 117.1 days annually when the nighttime low temperature falls below freezing, which is about average compared to other places in Illinois.
In Mendon, there are 7.0 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in Illinois.
The humidity can be uncomfortably heavy or close in Mendon 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 Mendon.
May is the wettest month in Mendon with 4.9 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 38.8 inches in Mendon means that it is about average compared to other places in Illinois.
May is the rainiest month in Mendon with 11.2 days of rain, and January is the driest month with only 6.2 rainy days. There are 99.3 rainy days annually in Mendon, which is less rainy than most places in Illinois. The rainiest season is Summer when it rains 30% of the time and the driest is Spring with only a 20% chance of a rainy day.
An annual snowfall of 17.8 inches in Mendon means that it is less snowy than most places in Illinois. January is the snowiest month in Mendon with 5.5 inches of snow, and 5 months of the year have significant snowfall.
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