Do Solar Panels Work in Canadian Winters? Cold, Snow, Rain and Hail

It's the first question almost every Canadian asks about solar, and it deserves a straight answer by season and by weather. Here's what cold, snow, rain and hail actually do to a system, and what winter means for your bill in each province.

Does cold weather reduce solar output?

No. Solar cells make more voltage when they're cold. Panels are rated at a cell temperature of 25°C, and every degree below that adds a little output. A modern panel with a temperature coefficient around −0.3%/°C gains roughly 3% for every 10°C it runs below its rating. On a clear, cold day a panel can briefly produce more than its nameplate. We cover the specs that matter in Solar Panels Compared for Canadian Winters.

Why do panels make less power in winter?

Two reasons, and neither is the cold:

• Fewer hours of daylight. A December day in southern Canada gets only about 60% of the daylight of a June day, and less the farther north you go.
• A lower sun. Winter sunlight hits the panels at a shallower angle and travels through more atmosphere, so each hour delivers less energy.

The size of the dip depends on where you live. The cloudy BC coast sees the biggest drop; the sunny Prairies see the smallest, and Calgary and Edmonton are among the best solar cities in the country. Natural Resources Canada publishes month-by-month solar potential for hundreds of municipalities, and a good quote should use it, or similar data, for your address.

What happens when snow covers the panels?

A heavy layer blocks production until it clears. In practice that's usually days, not weeks:

• Panels are tilted and the glass is slick, so snow tends to slide off, often all at once.
• Dark panels warm in the sun, which loosens the layer from underneath.
• A thin dusting lets some light through, and output recovers fast once the edge clears.
• Snow-covered ground around the house reflects extra light onto clear panels.

Panels are also built for the weight. Premium modules are commonly rated for 5,400 Pa of snow load, and your installer should check the roof structure against local snow loads as part of design.

Should I clear snow off my solar panels?

Usually not. Climbing a snowy roof is dangerous, and metal shovels or stiff brushes can scratch the glass or damage the frame and wiring, which may void warranties. The power you'd gain back is small next to the year's total. If you want to help, a soft-headed roof rake used from the ground is the only tool to consider, and only if you can reach without stretching over the eaves.

One real winter consideration: snow sliding off a solar array comes down in one sheet. If panels sit above a door, walkway or driveway, ask about snow guards.

Do solar panels work in rain and cloud?

Yes, at reduced output. Panels respond to daylight, not direct sun, so an overcast day still produces something, often a modest share of a clear day's output. Rain helps too: it washes pollen and dust off the glass, which is why most Canadian systems never need professional cleaning. Panels and their connectors are sealed for years of rain, snowmelt and freeze-thaw.

Can hail damage solar panels?

Panels certified to IEC 61215 have passed an impact test with 25 mm ice balls fired at about 23 m/s, and tempered glass handles most storms. Very large hail can still break panels, as it can break car windshields. In Alberta's hail corridor, ask for the hail rating in writing and tell your home insurer about the system so it's covered.

What does winter mean for my bill?

That depends on how your province credits the power you export. This is where most generic winter articles are out of date:

• Ontario: on net metering, summer surplus becomes bill credits that carry forward up to 12 months, so a sunny July pays for part of January. If you take the Home Renovation Savings rebate instead, the system is built for load displacement, so there's no summer bank to draw on.
• Nova Scotia: exported power is banked as credit against your own use, and at about 19¢/kWh each winter kWh you don't buy is worth a lot. See Nova Scotia solar after SolarHomes.
• British Columbia: new systems since July 1, 2026 earn a flat 10¢/kWh for exports instead of 1:1 credits, so the summer surplus is worth less in winter. Size closer to your own use. See BC's 2026 rule changes.
• Alberta: exports are credited at your retailer's energy rate as you go, so winter shortfalls aren't offset by stored summer credits the way they are under net metering. Some retail plans pay a higher summer export rate to compensate.

Is a battery worth it for Canadian winters?

A battery doesn't make more energy in winter; it stores what you make. Its winter value is backup during storms, when grid-tied panels shut off for safety. If outages are your concern, read Do you actually need a home battery?.

Verified October 15, 2026. Output varies with location, roof and equipment. General information, not financial advice.