IRONWOOD, MI

Overview:
Ironwood is located in Gogebic County in the Upper Peninsula of Michigan, about a mile away from the Wisconsin border. The town is situated 18 miles south of Lake Superior. The lake, along with rivers, smaller lakes, and forests in the area, is increasingly used for recreational purposes. Lake Superior is also the dominant climactic controller for Ironwood.

Ironwood is part of the Lake Superior “Snowbelt,” meaning that it can experience heavy snow squalls during the winter due to its position relative to the lake. Ice cover also plays a part in the climate of Ironwood, as it influences over-lake winds. The area rarely experiences prolonged periods of heat in the summer or extreme cold in the winter.

State/ Province ID: MI

Station ID: C00204104

Directory Name: IRONWOOD_HCN_MI_C00204104

Elevation: 435.90m

Climatology PDF: Array

The resources presented here were developed in cooperation with the Office of the Michigan State Climatologist using data from the National Centers for Environmental Information. For more information regarding our data sources, quality control, and methodology, please see our Historical Climatologies: Quality Control reference guide.

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Precipitation
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Recent Climate Summary, 1991-2020


Average Temperature	40.1°F4.5°C
Average Low Temperature	30.5°F-0.8°C
Average High Temperature	49.8°9.9°C
Days/Year that exceed 90°F	1.0
Days/Year that fall below 32°F	180.6
Lowest Annual Average Temperature	36.3°F2.4°C
Highest Annual Average Temperature	44.6°F7.0°C
Average Annual Total Precipitation	37.4 in94.9 cm
Lowest Annual Precipitation Total	28.9 in73.3 cm
Highest Annual Precipitation Total	53.4 in135.6 cm
Days/Year that exceed 1.25" of Precipitation	3.7

Temperature

Click on the following links to be taken to the corresponding portion of the page.

Monthly Average Temperature
How Temperatures are Changing
- Changes in Average Temperature – Includes a summary table of the average annual and seasonal temperature changes, and time series graphs of how the annual low, average, and high temperatures compare to the long term average plotted for every year on record.
- Cold Temperatures – View time series plots of the number of days per year below 32°F and the number of heating degree days per year to see how cold days are changing.
- Hot Temperatures – View time series plots of the number of days per year above 90°F and the number of cooling degree days per year to see how hot days are changing.
- Growing Season Changes – View a time series of the annual number of days in the freeze-free period.

Monthly Average Temperature

Changes in Average Temperature, 1951-2025.


	°F°C
Annual average temperature	-0.10.0
Winter average temperature	1.20.6
Spring average temperature	-1.5-0.8
Summer average temperature	-0.7-0.4
Fall average temperature	0.00.0

Annual High and Low Temperature Departure

Cold Temperatures

¹Heating Degree Days (HDDs) are indexed units, not actual days, that roughly describe the demand to heat a building. HDDs accumulate on days colder than 65°F when heating is required. Every degree below 65°F is added to the annual total for an annual HDD value, which is plotted in the figure.

Hot Temperatures

²Cooling Degree Days (CDDs) are indexed units, not actual days, that roughly describe the demand to cool a building. CDDs accumulate on days warmer than 65°F when cooling is required. Every degree above 65°F is added to the annual total for an annual CDD value, which is plotted in the figure.

Growing Season Changes

Precipitation