Performance and output

Snow loss estimator, Midwest

Enter your snowfall, wind exposure, thaw frequency, and mounting setup. Get an annual kWh and dollar loss estimate built for Midwest winters.

Your system and winter

1 Project details Optional
Shown on your exported report. Leave blank to skip.
2 Your system
Use your system's rated annual output before any snow loss.
Find this on a recent utility bill. Midwest rates often run near or below the US average.
3 Your winter conditions
Chicago averages around 36in, Minneapolis around 54in, Detroit around 42in.
Steeper tilt sheds snow faster. Most pitched roofs run 20 to 40 degrees.
Wind blows loose snow off panels before it can compact and stick.
More thaw days between storms means less time under accumulated snow.
4 Mounting and upkeep
More clearance under the panels lets slid snow fall away instead of piling up.
Manual or heated clearing recovers output that would otherwise sit under snow.

How it works

Four steps to a snow loss number

Step 1

Look up your local snowfall average

NOAA climate normals give a reliable annual snowfall figure for most Midwest cities and towns. If you're weighing a move, compare this against the Northeast snow loss tool for context. The snow load damage risk calculator checks whether that snow load threatens the array itself.

Step 2

Rate your wind exposure

Open, flat terrain typical of much of the Midwest lets wind clear loose snow faster than sheltered spots behind trees or buildings.

Step 3

Factor in your thaw pattern

Frequent mid-winter thaws melt snow before it builds up, which is common across much of the Midwest compared to sustained Northeast cold.

Step 4

Decide on tilt and removal strategy

Combine tilt angle with your removal habits to land on a final number. The cold climate efficiency calculator shows the offsetting benefit cold temperatures bring.

Understanding snow loss in the Midwest

Why the Midwest loses less than you'd expect

A typical Midwest system with 45 inches of annual snowfall, moderate wind exposure, and frequent winter thaws loses around 2.3% of annual output. An 11,000 kWh/year system loses roughly 248 kWh a year under those conditions, less than a comparable Northeast system. The gap comes down to two regional traits: wind and thaw frequency. A DOE report on federal PV performance excludes snow cover from its baseline model by design, meaning any snow-driven loss appears entirely as a gap between measured and modeled output.

Wind does more work here than in the Northeast

Open, flat terrain across much of the Midwest brings stronger, more consistent wind that blows loose snow off panels faster than in sheltered Northeast valleys. An array in open, unsheltered terrain can see snow-related loss drop by roughly 20% compared to an identical array tucked behind trees or buildings, since wind actively clears loose snow rather than letting it sit and compact. NOAA's National Weather Service publishes historical wind and snowfall records for your specific location if you want a more precise picture than a general regional estimate.

Freeze-thaw cycles clear snow naturally

Midwest winters also see more mid-season thaw days, which melt accumulated snow before it can build up. This freeze-thaw pattern is a meaningful reason Midwest snow loss estimates tend to run lower than a Northeast system with similar total snowfall. Check the Northeast snow loss estimator to see the sustained-cold scenario side by side.

When a heated cable system still makes sense

Usually not necessary for typical Midwest snowfall and wind conditions, since natural wind clearing and freeze-thaw cycles already limit the loss. Heated cables make more sense in sheltered spots with heavy annual snowfall and low tilt, where snow tends to sit longer. The total cost of ownership calculator can help confirm whether that added equipment cost actually makes sense for your specific site conditions.

What to do with this number next

Run the output vs usage gap analyzer to see how a winter dip from snow lines up against your household's actual usage pattern.

Questions

Frequently asked

A typical Midwest system with 45 inches of annual snowfall, moderate wind exposure, and frequent winter thaws loses around 2.3% of annual output. An 11,000 kWh/year system loses roughly 248 kWh a year under those conditions, less than a comparable Northeast system.

Open, flat terrain across much of the Midwest brings stronger, more consistent wind that blows loose snow off panels faster than in sheltered Northeast valleys. Midwest winters also see more mid-season thaw days, which melt accumulated snow before it can build up.

Yes. An array in open, unsheltered terrain can see snow-related loss drop by roughly 20% compared to an identical array tucked behind trees or buildings, since wind actively clears loose snow rather than letting it sit and compact.

Usually not necessary for typical Midwest snowfall and wind conditions, since natural wind clearing and freeze-thaw cycles already limit the loss. Heated cables make more sense in sheltered spots with heavy annual snowfall and low tilt, where snow tends to sit longer.

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