Short answer
Yes, solar panels work in Canadian winter, and cold weather actually makes them slightly more efficient. Short days, low sun and snow cover mean winter months produce only a small share of the year's power, so summer does most of the work.
Key takeaways
- Winter months typically produce a small fraction of what summer months do.
- Cold makes panels more efficient. Short days and snow are what cut output.
- Snow usually slides off tilted panels within a few sunny days.
- Do not climb on your roof to clear panels.
- Size and judge solar on yearly output, not winter output.
Solar panels do work in Canadian winter and snow. They produce power from light, not heat, so a clear, cold January day can still generate electricity. The challenge is that winter days are short, the sun sits low, and snow can cover panels for days at a time.
Across a year, this means winter months typically produce only a small share of total output, while May to August produce the most. Solar in Canada still makes sense where the yearly numbers work, because systems are sized and credited on a full year of production.
Monthly solar production in Canada
The table shows an illustrative pattern for 1 kW of panels in southern Ontario producing about 1,150 kWh per year. Snow cover can push the winter months lower in a given year. The Prairies follow a similar shape with higher totals and more clear winter days.
| Month | Approx. kWh per installed kW |
|---|---|
| January | 55 |
| February | 75 |
| March | 105 |
| April | 120 |
| May | 135 |
| June | 135 |
| July | 140 |
| August | 125 |
| September | 105 |
| October | 75 |
| November | 45 |
| December | 40 |
December and July can differ by a factor of three or more. Meanwhile, your home likely uses more electricity in winter for lighting and, if you have one, a heat pump. So most solar homes draw from the grid in winter and send power out in summer. Net metering is what lets summer credits cover part of winter bills.
Do solar panels work in the cold?
Cold is good for solar panels. Like most electronics, they run more efficiently at lower temperatures. Typical panels lose about 0.3% to 0.4% of output for each degree Celsius above 25 °C, and gain a similar amount below it. On a sunny -10 °C day, a clean panel can briefly produce more than its rated output.
Bright snow on the ground can also reflect extra light onto panels, a small bonus on clear days after a storm. What reduces winter output is the sun's angle and the length of the day.
What happens when snow covers solar panels
A layer of snow blocks light and output drops to near zero until it clears. In most cases that happens on its own.
- Panels shed snow. The glass surface is smooth, and dark panels warm slightly in daylight, so snow tends to slide off.
- Tilt helps. Steeper roofs shed snow faster. Low-slope or flat mounts hold snow longer.
- Typical timing. After a snowfall, tilted panels often clear within one to a few sunny days. After heavy, wet snow or freezing rain, it can take longer.
Should you clear snow off solar panels?
Usually no. The power you gain from clearing a few days early is small, because winter production is low anyway. Climbing on a snowy roof is dangerous, and hard tools or metal scrapers can scratch glass and void warranties. If you have ground-mounted panels you can reach safely, a soft foam roof rake is the only tool to use.
Also think about where snow lands. Panels can send a sudden slide of snow off the roof edge. Keep walkways, entrances and vents below solar arrays clear, and consider snow guards if your installer recommends them.
Can panels handle Canadian snow loads?
Panels and racking for the Canadian market are tested for snow and wind loads. Your installer should confirm that your roof structure can carry the panels plus local snow loads, which vary across the country. Ask for this in writing, especially on older homes. Panels usually carry 25-year warranties and degrade about 0.5% per year, so winter wear is rarely the issue. Poor installation is the bigger risk. See our guide on comparing solar quotes for what to check.
Winter, solar and backup power
Grid-tied solar shuts off during a power outage for the safety of line workers. To keep power on during a winter storm, you need a battery or a generator. In winter, solar may not recharge a battery much during a long outage, so plan backup around stored energy. Our home battery guide covers sizing.
Is solar still worth it with Canadian winters?
The yield figures used for Canadian solar, typically 1,000 to 1,350 kWh per installed kW per year, already include winter. Judge solar on that yearly total and your electricity rate. Our solar payback guide breaks this down by province, and the solar calculator estimates output for your home.
Frequently asked questions
Do solar panels work in winter in Canada?
Yes. They produce less because days are short and the sun is low, but they still generate power on clear days and are more efficient in the cold.
Do solar panels work when covered in snow?
Output drops to near zero while panels are fully covered. Snow usually slides off tilted panels within one to a few sunny days.
Should I remove snow from my solar panels?
Usually not. The extra power is small, roof work in winter is dangerous, and scraping can damage panels or void warranties.
How much do solar panels produce in December in Canada?
Typically only a small share of what they produce in July, often a third or less. Snow cover can reduce it further in some years.
Want numbers for your own home?
Use the solar savings calculator with your province's prices and climate. It takes about two minutes.