"But what about winter?" We hear this in almost every consultation we do in Pittsburgh. It's usually the second or third question, right after "how much does it cost?" And honestly, it's a fair concern. Pittsburgh winters aren't exactly known for abundant sunshine.
The answer is a lot better than most people expect. Solar panels don't just work in winter. In some ways, cold weather actually helps them. We've got six years of production data from real systems on real roofs across western PA, and the numbers tell a clear story. Winter is the slower season, but it doesn't break the math. Not even close.
Cold Weather Actually Helps Solar Panels
This surprises almost everyone, so let's start here. Solar panels are semiconductor devices, the same basic technology as computer chips. And like computer chips, they perform better when they're cool. Every solar panel has a temperature coefficient, which measures how much efficiency drops as the panel heats up. For most modern panels, efficiency decreases about 0.3-0.4% for every degree Celsius above 25°C (77°F).
On a 95°F July afternoon in Pittsburgh, your panels might be running at 140°F+ on the surface. That heat is dragging their efficiency down by 8-12% compared to their rated output. On a crisp, clear 30°F day in January? Your panels are running cool and efficient. Per hour of sunlight, a cold sunny day can actually outproduce a hot sunny day.
Heat is the enemy of solar panels, not cold. A clear winter day at 25°F can produce more electricity per hour of sunlight than a hazy 92°F summer afternoon. The issue with winter isn't temperature. It's how many hours of sunlight you get.
The Real Challenge: Shorter Days, Not Cold Temperatures
So if cold weather helps, why does winter production drop? Simple. Daylight hours. Pittsburgh gets about 15 hours of daylight on the summer solstice in June and roughly 9.5 hours on the winter solstice in December. That's a 37% reduction in available sunlight just from day length alone.
On top of that, the winter sun sits lower in the sky. Lower sun angle means sunlight passes through more atmosphere before reaching your panels, which weakens its intensity. Your panels are mounted at a fixed angle (usually 25-35° in our area), optimized for annual production. That angle catches summer sun beautifully but isn't ideal for the low winter sun.
Then there's cloud cover. Pittsburgh averages about 200 cloudy or partly cloudy days per year, and a lot of those cluster in the November-February window. Clouds don't completely stop production (panels still generate from diffuse light on overcast days), but output drops to maybe 10-25% of a sunny day's production.
Putting It All Together
Shorter days, lower sun angle, more clouds. That combination means December and January are your lowest production months. A system that produces 1,200 kWh in June might produce 400-500 kWh in December. That's a big drop, but it's not zero, and your system was designed with this seasonal swing in mind.
Snow: The Honest Take
Let's talk about the elephant in the room. Yes, snow covers solar panels. Yes, covered panels don't produce electricity. But the reality of snow on solar panels is a lot less dramatic than most people imagine.
Solar panels are dark-colored, smooth glass surfaces mounted at an angle. Even a small amount of sunlight hitting them warms the glass enough to start melting snow from underneath. The smooth surface means that once the bond between snow and glass breaks, gravity takes over and the snow slides off. On most days after a snowfall, panels start clearing themselves within a few hours of sunrise.
How Quickly Do Panels Clear?
For a typical 2-4 inch snowfall (which is most Pittsburgh snow events), panels usually clear within a day, often within hours. Heavy, wet snow slides off faster than light, fluffy snow because of its weight. After a major storm that dumps 6+ inches, it might take 1-2 days for panels to fully clear.
We've tracked this across our installs. On average, snow-related production loss accounts for about 2-5% of total annual production. That's already factored into the production estimates we give customers. It's real, but it's small in the big picture.
Should You Clear Snow Off Your Panels?
We get asked this constantly, and our answer is almost always no. Don't climb on your roof in winter to brush off solar panels. It's dangerous. You risk damaging the panels or voiding your warranty by using the wrong tools. A metal shovel or stiff brush can scratch the glass coating that protects the cells.
The math doesn't justify the risk either. Say a snowfall costs you two days of winter production. That's maybe 10-15 kWh of lost electricity, worth about $1.50-$2.00. You're not climbing a frozen roof for two bucks. Let nature do its thing. The panels will clear themselves.
We don't recommend climbing on your roof to remove snow from solar panels. The risk of injury and panel damage far outweighs the $1-$2 of lost production. Panels are designed to self-clear, and they do it surprisingly fast.
Real Winter Production Numbers from Pittsburgh Roofs
Theory is one thing. Here's what we actually see from systems we've installed across the Pittsburgh region. These numbers come from monitoring data on 8kW systems, our most common residential size.
- June (peak month): 1,100-1,300 kWh
- July: 1,050-1,250 kWh
- December (lowest month): 350-500 kWh
- January: 380-520 kWh
- February: 450-600 kWh
- Annual total: approximately 9,500-10,500 kWh
The November-February period typically accounts for about 20-25% of your system's annual production. Summer (May-August) delivers around 45-50%. The shoulders (March/April and September/October) make up the rest. That winter production isn't spectacular, but it's meaningful. Four hundred kWh in December is still $50-$60 worth of electricity you didn't have to buy.
Why Pittsburgh Is Better for Solar Than Its Reputation Suggests
Pittsburgh has a reputation as a gray, cloudy city. We're not Tucson. The numbers tell a more nuanced story. The Pittsburgh area gets approximately 2,000 peak sun hours per year and around 160 sunny or partly sunny days. That puts us ahead of plenty of places where solar is thriving.
Germany is the comparison we always come back to. Germany gets significantly less annual sunshine than Pittsburgh, roughly 30% less in most regions, and it's one of the world's leaders in solar energy. They've installed more solar per capita than almost any country on Earth. If solar works in Munich, it definitely works in Mt. Lebanon.
The other factor people overlook: Pennsylvania's electricity rates are above the national average. Duquesne Light customers pay around $0.13-$0.15/kWh, and rates have been climbing 3-5% per year. Higher electricity prices mean each kWh your panels produce is worth more in avoided costs. You don't need Arizona sun when you're paying Pittsburgh electricity prices.
How We Design Systems to Handle Winter
When we design a solar system for a Pittsburgh home, we don't assume year-round sunshine. We use historical weather data, satellite imagery, and shade modeling specific to your roof to project monthly production across all 12 months. The system is sized based on your annual electricity usage, not your best-case summer month.
The goal is to offset 90-100% of your annual electricity consumption. That means deliberately oversizing for summer so you build enough net metering credits to cover the winter gap. Think of it like a squirrel storing nuts: you bank solar credits in the warm months and spend them in the cold months.
Net Metering Is the Key
This is where Pennsylvania's net metering policy becomes really important. When you overproduce in June, those excess kilowatt-hours become credits on your utility account. When you underproduce in January, you draw from those credits instead of paying full price for grid electricity.
Without net metering, winter performance would be a much bigger problem because you'd waste all that excess summer production. With net metering, the grid essentially acts as a free, infinite battery. Your summer surplus directly offsets your winter deficit. Over 12 months, a properly designed system covers your annual needs even though no single winter month might break even on its own.
Winter Maintenance: What You Should (and Shouldn't) Do
Solar panels are low-maintenance year-round, and winter doesn't change that much. But there are a few things worth paying attention to during the colder months.
- Monitor your production through the Enphase or SolarEdge app. If you see a sudden unexplained drop in output lasting more than a few days, it could indicate an issue beyond normal winter conditions
- Check for new shade sources: a tree that was bare when you installed in summer might have grown branches that shadow your panels, or a neighbor might have added a structure
- Don't clear snow manually. Let panels self-clear and accept the minor production loss
- Watch for ice dams on your roof around the panels (this is a roof issue, not a solar issue), but worth monitoring
- Keep your monitoring app notifications turned on so you're alerted to any equipment issues like inverter faults
If something does seem off, like production that's 50% below projections for an extended period on sunny days, give us a call. It could be something as simple as a tripped breaker or an inverter that needs a reset. We include monitoring and support with every system we install, so there's no extra charge for a check-in.
What About Battery Storage for Winter?
Some homeowners ask if adding a battery would help with winter production. Honestly, batteries don't increase production. Your panels generate the same amount whether you have a battery or not. What a battery does is store energy for use later, like overnight or during a power outage.
In Pittsburgh, winter power outages from ice storms are a real concern. If backup power during outages matters to you, a battery makes sense as an insurance policy. As a pure financial play, most PA homeowners get better ROI from net metering alone. We typically install home batteries at $8,000-$9,000 each (well below the $10,000-$15,000 PA/OH market average), but net metering already gives you the seasonal storage effect for free.
We install batteries for customers who want them, and we think they're a great product. We won't tell you that you need one just to make solar work in winter. Net metering handles the seasonal math just fine.
The Year-Round Picture: Why Annual Production Matters
If you looked only at December and January, you might think solar in Pittsburgh is a tough sell. Solar isn't a monthly investment though. It's an annual one. Your return on investment is calculated over 12 months, and when you look at the full year, the story is compelling.
An 8kW system in the Pittsburgh area produces approximately 9,500-10,500 kWh per year. If your home uses 10,000 kWh/year, that system covers essentially all of your electricity needs across the year. Some months you'll overproduce. Some months you'll underproduce. But the annual total is what determines your savings, and the annual total works.
Don't judge your solar system by your December electric bill. Judge it by your total electricity cost for the year. A system that covers 90%+ of your annual usage is doing exactly what it was designed to do, even if winter months show a shortfall.
Real Talk: Solar in Pittsburgh Isn't a Summer-Only Thing
We've been installing solar across our utility service areas in western Pennsylvania for over six years. We've seen every kind of winter this region throws (the mild ones, the brutal ones, the ones where it seems like the sun disappears until March). Through all of it, our customers' systems have performed within the range we projected.
Winter doesn't break solar in Pittsburgh. It's a predictable, planned-for part of the annual production cycle. Systems are designed for it, net metering accounts for it, and the financial returns reflect it. If solar didn't work in cold, cloudy places, half of Europe would have given up on it years ago.
If you've been putting off solar because you're worried about Pittsburgh winters, stop waiting. The weather here is already baked into every production estimate we give. We don't guess. We model your specific roof with local weather data and show you exactly what to expect, month by month, including the gray ones.
Want to see what a system would produce on your roof, winter months included? Give us a call at (877) 869-1458 or request a free quote. We'll show you the full 12-month picture, no sugarcoating, no best-case-only projections. Just real numbers from real Pittsburgh rooftops.
