Washington County, IA Climate

Washington, IA County has a humid continental climate, with cold winters and hot, humid summers. Average temperatures in the summer range from 65 to 87 degrees Fahrenheit with occasional heat waves pushing the temperatures into the 90s. Winters are cold but typically mild, with average temperatures ranging from 20 to 40 degrees Fahrenheit. Rainfall is moderate throughout the year, usually between 3 and 4 inches per month. Snowfall is also possible during winter months with an average of 14 inches of snowfall annually. The area has long spring and fall seasons that are pleasant and mild weather-wise.

Washington County, Iowa gets 37 inches of rain, on average, per year. The US average is 38 inches of rain per year.

Washington County averages 27 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 198 sunny days per year in Washington County. The US average is 205 sunny days.

Washington County gets some kind of precipitation, on average, 104 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 13
Rain: averages 37 inches of rain a year
Snow: averages 27 inches of snow a year

Bestplaces Comfort Index

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

8.6 Summer - 4.8 Winter

June, September and May are the most pleasant months in Washington County, while January and December are the least comfortable months.

Climate	Washington, Iowa	United States
	37.1 in.	38.1 in.
	27.4 in.	27.8 in.
	104.1 days	106.2 days
	198 days	205 days
	85.5°	85.8°
	12.8°	21.7°
	7	7
	3.9	4.3
	728 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 Washington County with an average high temperature of 85.5°, which ranks it as warmer than most places in Iowa. In Washington County, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Washington County are September, June and May.

In Washington County, there are 17.1 days annually when the high temperature is over 90°, which is hotter than most places in Iowa.

January has the coldest nighttime temperatures for Washington County with an average of 12.8°. This is warmer than most places in Iowa.

In Washington County, there are 136.4 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Iowa.

In Washington County, there are 13.4 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in Iowa.

The humidity is usually comfortable in Washington County 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 Washington County are July, August and June.

June is the wettest month in Washington County with 4.7 inches of rain, and the driest month is January with 1.2 inches. The wettest season is Autumn with 36% of yearly precipitation and 12% occurs in Spring, which is the driest season. The annual rainfall of 37.1 inches in Washington County means that it is wetter than most places in Iowa.

May is the rainiest month in Washington County with 11.5 days of rain, and February is the driest month with only 6.6 rainy days. There are 104.1 rainy days annually in Washington County, which is rainier than most places in Iowa. The rainiest season is Summer when it rains 28% of the time and the driest is Spring with only a 20% chance of a rainy day.

An annual snowfall of 27.4 inches in Washington County means that it is less snowy than most places in Iowa. February is the snowiest month in Washington County with 7.4 inches of snow, and 6 months of the year have significant snowfall.

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