Plymouth, IL Climate


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United States / Illinois / Fort Madison-Keokuk Metro Area / Hancock County / Plymouth / Zip Codes
Plymouth, IL is located in the Midwest and has a moderate humid continental climate. Summers are hot and humid, while winters are cold and snowy. Average high temperatures range from the mid-30s to the lower 90s throughout the year, while average lows range from 10°F in winter to around 70°F during summer months. Precipitation is fairly evenly distributed throughout the year, with an average of about 40 inches of rain annually. Snowfall generally ranges between 15-25 inches per year.

Plymouth, Illinois gets 40 inches of rain, on average, per year. The US average is 38 inches of rain per year.

Plymouth averages 20 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 Plymouth. The US average is 205 sunny days.

Plymouth gets some kind of precipitation, on average, 96 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 87 degrees
Winter Low: the January low is 16
Rain: averages 40 inches of rain a year
Snow: averages 20 inches of snow a year

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for Plymouth is 7.1 (10=best), which means it is more comfortable than most places in Illinois.

8.3 Summer - 5.2 Winter
September, June and May are the most pleasant months in Plymouth, while January and December are the least comfortable months.

  ClimatePlymouth, IllinoisUnited States
  39.9 in.38.1 in.
  20.2 in.27.8 in.
  95.7 days106.2 days
  201 days205 days
  86.9°85.8°
  15.6°21.7°
  7.17
  3.84.3
  650 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 Plymouth with an average high temperature of 86.9°, which ranks it as warmer than most places in Illinois. In Plymouth, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Plymouth are September, May and June.
In Plymouth, there are 24.5 days annually when the high temperature is over 90°, which is hotter than most places in Illinois.
January has the coldest nighttime temperatures for Plymouth with an average of 15.6°. This is colder than most places in Illinois.
In Plymouth, there are 127.3 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Illinois.
In Plymouth, there are 8.6 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Illinois.
The humidity can be uncomfortably heavy or close in Plymouth 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 Plymouth.
May is the wettest month in Plymouth with 5.0 inches of rain, and the driest month is January with 1.7 inches. The wettest season is Autumn with 32% of yearly precipitation and 14% occurs in Spring, which is the driest season. The annual rainfall of 39.9 inches in Plymouth means that it is wetter than most places in Illinois.
May is the rainiest month in Plymouth with 10.8 days of rain, and February is the driest month with only 5.9 rainy days. There are 95.7 rainy days annually in Plymouth, which is one of the least rainy 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 20.2 inches in Plymouth means that it is about average compared to other places in Illinois. January is the snowiest month in Plymouth with 6.7 inches of snow, and 5 months of the year have significant snowfall.
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