30-year climate normals

Iron County Climate and Weather Averages

Hottest month — July

78.6°

average daily high. The coldest month is January, averaging a low of 0.0°F.

Iron County gets 31.35" of precipitation a year, and 34% of it falls in Jul, Aug, Sep.

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	21.7°	0.0°	1.32"
February	25.9°	0.4°	1.11"
March	36.7°	10.4°	1.73"
April	49.5°	24.2°	2.78"
May	64.8°	36.8°	3.07"
June	73.7°	46.4°	3.57"
July	78.6°	50.7°	3.89"
August	76.3°	48.5°	3.20"
September	68.2°	41.8°	3.63"
October	53.6°	30.8°	3.27"
November	38.6°	20.5°	2.14"
December	26.7°	8.3°	1.64"

Rainfall by month

Precipitation is spread fairly evenly through the year here, with 34% falling in the wettest three months (Jul, Aug, Sep).

January 1.32"

February 1.11"

March 1.73"

April 2.78"

May 3.07"

June 3.57"

July 3.89"

August 3.20"

September 3.63"

October 3.27"

November 2.14"

December 1.64"

Annual total 31.35"

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 175

Heating degree days How much heating the climate demands 9,658

Approximate annual cooling cost At 22.01¢/kWh, Michigan average $39

Approximate annual electric heating cost Lower where heating is gas rather than electric $744

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 Iron County, where electricity is one line of eight.

Common questions

What is the weather like in Iron County?

Iron County averages a high of 78.6°F in July and a low of 0.0°F in January. Annual precipitation is 31.35 inches, with essentially no snow.

When is the rainy season in Iron County?

The wettest stretch is Jul, Aug, Sep, which accounts for 34% of the year's precipitation. Precipitation is relatively evenly distributed across the year.

How hot does it get in Iron County?

The average daily high in July, the hottest month, is 78.6°F. That drives 175 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Iron County?

Effectively no. Measurable snowfall is rare in Iron County.

Sources

Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station AMASA 1W, MI US (USC00200197), 6.1 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, Michigan residential average.
Wet-season share is the wettest three consecutive months as a percentage of annual precipitation, calculated from the monthly normals.