Williamson, IA Climate


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United States / Iowa / No Metro Area / Lucas County / Williamson / Zip Codes
Williamson, IA has a typical Midwestern climate with hot summers and cold winters. Temperatures in the summer range from the mid-70s to the mid-90s, while winter temperatures typically stay between 20 and 30 degrees Fahrenheit. The area gets an average of 36 inches of rain per year, making it relatively dry compared to other parts of the country. Winters are usually snowy, with up to 20 inches of snow per season. Spring and fall are generally mild with plenty of sunshine during both seasons.

Williamson, Iowa gets 38 inches of rain, on average, per year. The US average is 38 inches of rain per year.

Williamson averages 25 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 199 sunny days per year in Williamson. The US average is 205 sunny days.

Williamson gets some kind of precipitation, on average, 101 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 12
Rain: averages 38 inches of rain a year
Snow: averages 25 inches of snow a year

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for Williamson is 7.0 (10=best), which means it is more comfortable than most places in Iowa.

8.6 Summer - 4.9 Winter
June, September and August are the most pleasant months in Williamson, while January and December are the least comfortable months.

  ClimateWilliamson, IowaUnited States
  37.8 in.38.1 in.
  25.2 in.27.8 in.
  101.1 days106.2 days
  199 days205 days
  85.5°85.8°
  11.7°21.7°
  77
  3.74.3
  1024 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 Williamson with an average high temperature of 85.5°, which ranks it as warmer than most places in Iowa. In Williamson, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Williamson are September, June and August.
In Williamson, there are 17.7 days annually when the high temperature is over 90°, which is hotter than most places in Iowa.
January has the coldest nighttime temperatures for Williamson with an average of 11.7°. This is warmer than most places in Iowa.
In Williamson, there are 145.0 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Iowa.
In Williamson, there are 15.1 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in Iowa.
The humidity is usually comfortable in Williamson but some summer months can be unpleasant. July is the most humid month, though humidity is low for most of the year. The most humid months in Williamson are July, August and June.
July is the wettest month in Williamson with 5.0 inches of rain, and the driest month is January with 1.0 inches. The wettest season is Autumn with 38% of yearly precipitation and 9% occurs in Spring, which is the driest season. The annual rainfall of 37.8 inches in Williamson means that it is one of the wettest places in Iowa.
May is the rainiest month in Williamson with 12.5 days of rain, and January is the driest month with only 5.3 rainy days. There are 101.1 rainy days annually in Williamson, which is rainier than most places in Iowa. The rainiest season is Summer when it rains 30% of the time and the driest is Spring with only a 18% chance of a rainy day.
An annual snowfall of 25.2 inches in Williamson means that it is less snowy than most places in Iowa. February is the snowiest month in Williamson with 6.4 inches of snow, and 6 months of the year have significant snowfall.
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