This weather has a price Keeping the median Marshall County home comfortable runs roughly $542 a year in heating and cooling alone. See where it lands in the monthly bill

30-year climate normals

Marshall County Climate and Weather Averages

Hottest month: July

83.1°

average daily high. The coldest month is January, averaging a low of 10.1°F.

Marshall County gets 32.76" of precipitation a year, and 42% of it falls in Apr, May, Jun.

Temperature through the year

Each bar spans the average daily low to the average daily high for that month.

Month	Avg high	Avg low	Precip
January	27.7°	10.1°	0.77"
February	32.4°	14.0°	0.51"
March	45.9°	25.6°	1.64"
April	60.0°	36.5°	3.69"
May	71.2°	48.7°	4.88"
June	80.6°	58.9°	5.32"
July	83.1°	62.2°	3.67"
August	81.0°	59.5°	3.88"
September	75.1°	50.6°	3.20"
October	61.8°	38.7°	2.45"
November	46.1°	26.3°	1.74"
December	33.0°	15.7°	1.01"

Rainfall by month

Precipitation is spread fairly evenly through the year here, with 42% falling in the wettest three months (Apr, May, Jun).

January 0.77"

February 0.51"

March 1.64"

April 3.69"

May 4.88"

June 5.32"

July 3.67"

August 3.88"

September 3.20"

October 2.45"

November 1.74"

December 1.01"

Annual total 32.76"

What this climate costs you

Degree days measure how hard a building has to work to stay comfortable. They are the reason two identical houses have very different power bills, and they are the link between the weather here and what you pay every month.

Cooling degree days How much air conditioning the climate demands 727

Heating degree days How much heating the climate demands 6,996

Approximate annual cooling cost At 17.06¢/kWh, Iowa average $124

Approximate annual electric heating cost Lower where heating is gas rather than electric $418

These are rough planning figures from degree days and the state electricity price, not a bill estimate. House size, insulation and fuel type move them a lot. See the full cost of owning a home in Marshall County, where electricity is one line of eight.

Common questions

What is the weather like in Marshall County?

Marshall County averages a high of 83.1°F in July and a low of 10.1°F in January. Annual precipitation is 32.76 inches, with essentially no snow.

When is the rainy season in Marshall County?

The wettest stretch is Apr, May, Jun, which accounts for 42% of the year's precipitation. Precipitation is relatively evenly distributed across the year.

How hot does it get in Marshall County?

The average daily high in July, the hottest month, is 83.1°F. That drives 727 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Marshall County?

The weather station used for Marshall County, MARSHALLTOWN MUNI AP, IA US, reports temperature and precipitation but not snowfall, so there is no snow normal to quote here. Precipitation that falls as snow is still counted in the 32.76 inches above, measured as melted water.

Sources

Temperature, precipitation and snowfall normals: NOAA National Centers for Environmental Information, 1991 to 2020 Monthly Climate Normals, station MARSHALLTOWN MUNI AP, IA US (USW00094988), 5.9 miles from the county centroid.
Heating and cooling degree days: NOAA, same station and period.
Annual figures on this page are the sum of that station's twelve monthly normals. NOAA also publishes a separately-computed annual normal, which can differ from the monthly sum by a few percent; we use the monthly series because the month-by-month breakdown above has to come from it.
Electricity price: US Energy Information Administration, Electric Power Monthly Table 5.6.A, Iowa residential average.
Wet-season share is the wettest three consecutive months as a percentage of annual precipitation, calculated from the monthly normals.