Jefferson County, IA Climate

Jefferson, IA County has a variety of climates depending on the season. In the summer months, the area is usually quite warm with temperatures reaching into the high 80s and low 90s. During spring and fall, temperatures are mild and range from the mid-50s to mid-70s. Winters are cold with temperatures often dropping below freezing and snowfall or other wintry weather not uncommon. Due to its location in central Iowa, Jefferson experiences all four seasons as well as pleasant weather throughout most of the year.

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

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

On average, there are 196 sunny days per year in Jefferson County. The US average is 205 sunny days.

Jefferson County gets some kind of precipitation, on average, 103 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 15
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 Jefferson County is 7.1 (10=best), which means it is one of the most pleasant places in Iowa.

8.5 Summer - 5 Winter

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

Climate	Jefferson, Iowa	United States
	38.4 in.	38.1 in.
	24.5 in.	27.8 in.
	102.9 days	106.2 days
	196 days	205 days
	86.3°	85.8°
	14.6°	21.7°
	7.1	7
	3.8	4.3
	741 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 Jefferson County with an average high temperature of 86.3°, which ranks it as one of the hottest places in Iowa. In Jefferson County, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Jefferson County are September, June and May.

In Jefferson County, there are 20.8 days annually when the high temperature is over 90°, which is one of the hottest places in Iowa.

January has the coldest nighttime temperatures for Jefferson County with an average of 14.6°. This is one of the warmest places in Iowa.

In Jefferson County, there are 127.4 days annually when the nighttime low temperature falls below freezing, which is one of the warmest places in Iowa.

In Jefferson County, there are 11.1 days annually when the nighttime low temperature falls below zero°, which is one of the warmest places in Iowa.

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

May is the wettest month in Jefferson County with 4.9 inches of rain, and the driest month is February with 1.5 inches. The wettest season is Autumn with 35% of yearly precipitation and 13% occurs in Spring, which is the driest season. The annual rainfall of 38.4 inches in Jefferson County means that it is one of the wettest places in Iowa.

May is the rainiest month in Jefferson County with 11.8 days of rain, and February is the driest month with only 6.6 rainy days. There are 102.9 rainy days annually in Jefferson County, which is rainier than most places in Iowa. The rainiest season is Summer when it rains 29% of the time and the driest is Spring with only a 20% chance of a rainy day.

An annual snowfall of 24.5 inches in Jefferson County means that it is less snowy than most places in Iowa. February is the snowiest month in Jefferson County with 6.7 inches of snow, and 6 months of the year have significant snowfall.

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