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United States › Iowa › Mills County › Climate Station GLENWOOD 3SW, IA US Distance 8.2 mi Normals 1991–2020

30-year climate normals

Mills County Climate and Weather Averages

Hottest month — July

86.9°

average daily high. The coldest month is January, averaging a low of 12.2°F.

Mills County gets 34.8" of precipitation a year and 23.7" of snow, and 44% of it falls in May, Jun, Jul.

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 PrecipSnow
January 33.0° 12.2° 0.66" 8.2"
February 38.2° 16.4° 1.03" 7.0"
March 51.5° 27.5° 2.03" 3.4"
April 63.9° 38.0° 3.73" 0.4"
May 74.2° 50.2° 5.19" 0.0"
June 83.4° 61.2° 5.96" 0.0"
July 86.9° 64.7° 4.31" 0.0"
August 85.1° 62.1° 3.81" 0.0"
September 79.4° 52.7° 3.32" 0.0"
October 66.6° 39.9° 2.30" 0.0"
November 50.6° 27.7° 1.30" 1.3"
December 37.6° 17.5° 1.16" 3.4"

Rainfall by month

Precipitation is spread fairly evenly through the year here, with 44% falling in the wettest three months (May, Jun, Jul).

January 0.66"
February 1.03"
March 2.03"
April 3.73"
May 5.19"
June 5.96"
July 4.31"
August 3.81"
September 3.32"
October 2.30"
November 1.30"
December 1.16"
Annual total 34.8"

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 1,070
Heating degree days How much heating the climate demands 6,188
Approximate annual cooling cost At 14.14¢/kWh, Iowa average $151
Approximate annual electric heating cost Lower where heating is gas rather than electric $306

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 Mills County, where electricity is one line of eight.

Common questions

What is the weather like in Mills County?

Mills County averages a high of 86.9°F in July and a low of 12.2°F in January. Annual precipitation is 34.8 inches, including 23.7 inches of snow.

When is the rainy season in Mills County?

The wettest stretch is May, Jun, Jul, which accounts for 44% of the year's precipitation. Precipitation is relatively evenly distributed across the year.

How hot does it get in Mills County?

The average daily high in July, the hottest month, is 86.9°F. That drives 1,070 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Mills County?

Yes. Mills County averages 23.7 inches of snow a year.

Sources

  • Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station GLENWOOD 3SW, IA US (USC00133290), 8.2 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.