30-year climate normals

Iowa County Climate and Weather Averages

Hottest month — July

81.4°

average daily high. The coldest month is January, averaging a low of 8.9°F.

Iowa County gets 39.63" of precipitation a year and 41.1" of snow, and 38% 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.

Month	Avg high	Avg low	Precip	Snow
January	26.0°	8.9°	1.45"	10.3"
February	30.6°	12.1°	1.52"	10.6"
March	42.8°	23.0°	2.30"	5.9"
April	56.5°	33.9°	3.88"	1.5"
May	68.3°	45.5°	4.61"	0.0"
June	77.7°	55.9°	5.73"	0.0"
July	81.4°	60.1°	4.71"	0.0"
August	79.6°	58.2°	4.39"	0.0"
September	72.4°	49.4°	3.66"	0.0"
October	59.3°	37.6°	3.08"	0.6"
November	43.9°	26.0°	2.47"	1.9"
December	31.1°	15.6°	1.83"	10.3"

Rainfall by month

Precipitation is spread fairly evenly through the year here, with 38% falling in the wettest three months (May, Jun, Jul).

January 1.45"

February 1.52"

March 2.30"

April 3.88"

May 4.61"

June 5.73"

July 4.71"

August 4.39"

September 3.66"

October 3.08"

November 2.47"

December 1.83"

Annual total 39.63"

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 529

Heating degree days How much heating the climate demands 7,541

Approximate annual cooling cost At 19.74¢/kWh, Wisconsin average $104

Approximate annual electric heating cost Lower where heating is gas rather than electric $521

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 Iowa County, where electricity is one line of eight.

Common questions

What is the weather like in Iowa County?

Iowa County averages a high of 81.4°F in July and a low of 8.9°F in January. Annual precipitation is 39.63 inches, including 41.1 inches of snow.

When is the rainy season in Iowa County?

The wettest stretch is May, Jun, Jul, which accounts for 38% of the year's precipitation. Precipitation is relatively evenly distributed across the year.

How hot does it get in Iowa County?

The average daily high in July, the hottest month, is 81.4°F. That drives 529 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Iowa County?

Yes. Iowa County averages 41.1 inches of snow a year.

Sources

Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station DODGEVILLE WWTP, WI US (USC00472173), 2.9 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, Wisconsin residential average.
Wet-season share is the wettest three consecutive months as a percentage of annual precipitation, calculated from the monthly normals.