Cost to Own
United States › Iowa › Marshall County › Climate Station MARSHALLTOWN MUNI AP, IA US Distance 5.9 mi Normals 1991–2020

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.

20° 40° 60° 80° JanFebMarAprMayJunJulAugSepOctNovDec
MonthAvg highAvg 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 14.14¢/kWh, Iowa average $103
Approximate annual electric heating cost Lower where heating is gas rather than electric $346

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?

Effectively no. Measurable snowfall is rare in Marshall County.

Sources

  • Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 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.
  • 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.