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PA solar panels work in winter, but produce less — about 40-60% of peak summer output depending on region. Philadelphia sees 25 inches of snow annually with minimal impact. Erie gets 100+ inches (lake-effect) with more significant seasonal losses. Cold temperatures actually improve panel efficiency. Don't remove snow manually — it's unsafe and panels self-clear. Net metering banks your summer surplus to cover winter.
Approximate share of annual production by month — south-facing, 30° tilt, 8 kW system.
| Month | SE PA % | Western PA % | Avg Snow Days | SE PA Snow | Western PA Snow |
|---|---|---|---|---|---|
| Jan | 5.2% | 4.1% | 8 | 2.5" | 8" |
| Feb | 6.8% | 5.4% | 7 | 2.8" | 9" |
| Mar | 9.1% | 7.8% | 4 | 1.5" | 5" |
| Apr | 10.2% | 9% | 0 | 0" | 0.5" |
| May | 10.8% | 10.2% | 0 | 0" | 0" |
| Jun | 11.5% | 11.1% | 0 | 0" | 0" |
| Jul | 11.8% | 11.4% | 0 | 0" | 0" |
| Aug | 10.9% | 10.7% | 0 | 0" | 0" |
| Sep | 9.5% | 9.2% | 0 | 0" | 0" |
| Oct | 7.8% | 7.6% | 0 | 0" | 0" |
| Nov | 5.8% | 5.1% | 2 | 0.5" | 3" |
| Dec | 4.6% | 4.4% | 6 | 2.2" | 7" |
Production estimates. Actual varies by roof pitch, azimuth, shading, and specific weather year.
Pennsylvania's snowfall varies dramatically — from 25 inches in Philadelphia to 100+ inches in Erie.
Utility: PECO
Light snow clears quickly. Ice storms are bigger threat than snow.
Utility: Duquesne Light
Lower sun hours year-round compound the winter dip. Panel angle helps shed snow.
Utility: PPL
Orographic effect from Blue Mountain adds lake-effect-like snow bands.
Utility: Penelec
Lake-effect snow off Erie is the most severe in PA. Extended multi-day cover events.
Solar racking must meet or exceed the ground snow load for your county per PA's adoption of IBC/ASCE 7. Always verify your installer uses appropriately rated racking hardware.
| County/Region | Ground Snow Load | Notes |
|---|---|---|
| Philadelphia, Delaware, Montgomery, Chester | 30 psf | Lowest in state |
| Bucks, Lehigh, Northampton, Berks | 35-40 psf | Standard suburban |
| Allegheny (Pittsburgh area) | 40 psf | Standard western |
| Centre, Blair, Cambria, Clearfield | 45-55 psf | Mountain counties |
| Warren, McKean, Forest, Elk (NW Tier) | 60-70 psf | Highest load in PA |
Source: PA Uniform Construction Code (UCC) / ASCE 7-22. Local AHJ may adopt higher minimums.
Cold weather has real upsides for solar performance that most homeowners don't know about.
Silicon solar cells perform better at lower temperatures. At 25°F vs 95°F, a quality panel generates ~10-15% more electricity per hour of sun. PA's cold winters partially offset the reduced daylight hours.
When snow slides off panels, it takes pollen, bird droppings, and dust with it. Spring production often spikes after the first snow melt because panels are cleaner than at any other time of year.
Snow-covered ground reflects additional sunlight onto panels — an effect called the albedo boost. This partially compensates for the lower sun angle in winter months.
PA's 1:1 net metering rolls credits month to month. Your summer surplus (June-August) builds credits that offset winter months when you pull from the grid. Right-sized systems break even annually.
Practical guidance from installers who deal with PA winters every year.
Walking on a roof in winter is dangerous, and brushing panels risks scratching the anti-reflective coating. Snow typically slides off within 1-2 days once sun hits the panel surface.
If you get 12+ inches of heavy wet snow and your roof is shallow-pitched, a soft roof rake from the ground is OK — but stop short of the panels themselves.
Southern PA (40°N) benefits from panels tilted at 35-40°. This steeper angle promotes snow shedding better than flatter roof-flush mounts. Ask your installer about tilt.
Rock salt and chemical de-icers can permanently damage solar panel glass and frames. Never apply these to or near panels.
A day of zero production in winter is normal during snow cover. Multiple consecutive days of zero production when neighbors report clear panels means check the system.
PA's 1:1 net metering law is the key mechanism that makes winter solar viable. Here's how it works:
System overproduces. Excess kWh rolled as credits at full retail rate ($0.18-$0.21/kWh).
System underproduces. Bill credits from summer automatically offset your grid usage.
At annual reset, leftover credits paid at PTC rate (~$0.11-$0.13/kWh). Right-size to avoid large surplus.
PPL Territory Warning: PPL Electric has proposed replacing 1:1 retail net metering credits with hourly wholesale (LMP) rates starting July 2026. If approved, winter/night usage would be credited at much lower wholesale rates. PPL customers should strongly consider locking in current 1:1 rates by installing before the proposed changes take effect.
Full PA Net Metering GuideWe'll size your system accounting for your county's sun hours, typical snow days, and net metering rules — so you're not surprised in February.
Rebates and incentives vary by location and equipment. Use our calculator to see your specific eligibility.
Estimate My SavingsYes — solar panels work in winter, but produce less than in summer. In Philadelphia/SE PA, a south-facing system produces about 55-60% of its peak summer monthly output in January-February. In Pittsburgh, about 40-50%. In Erie, 30-40% due to lake-effect snow cover and lower sun angle. The key insight: panels don't need heat — they need light. Cold temperatures actually make panels more efficient. The shorter winter days and occasional snow cover (not temperature) are what reduce production.
Light dustings (1-2 inches) rarely reduce output significantly — wind and sun clear them quickly, and partial illumination still generates power. Heavy snow (6+ inches) can block panels for 1-3 days. In Philly (25 in/yr avg), this happens 2-4 times/year — maybe 5-7 days of significant loss annually. In Erie (100+ in/yr), this could be 15-25 days/year. Annually, snow-related losses are estimated at 1-3% in SE PA and 5-10% in NW PA/Erie.
Generally no. Snow slides off most roof-mounted systems within 1-3 days once sunlight hits the dark panel surface. Manually removing snow carries significant risks: slipping on an icy roof, voiding your panel warranty by scratching the glass coating, and physical damage to panel frames or wiring. Exception: if you have a flat or low-pitch roof (<15°) with very heavy wet snow that won't slide, a soft ground-mounted roof rake (stopping short of panel surfaces) is acceptable.
PA snow load requirements vary by county: Southeast PA (Philadelphia, Montgomery, Chester): 30 psf | Central/suburban PA: 35-40 psf | Pittsburgh metro (Allegheny): 40 psf | Mountain counties (Centre, Blair, Cambria): 45-55 psf | Northwest tier (Warren, McKean): 60-70 psf. Quality solar racking systems are engineered to 40 psf standard, with options up to 70 psf for northwest PA. Always verify your installer is using racking rated for your county's ground snow load.
PA's 1:1 net metering law allows your summer surplus to roll as credits month-to-month on your bill. A well-designed 8-10 kW system in PECO territory might build up 800-1,200 kWh in credits from June-August, then draw those credits back in November-February when production drops. At annual true-up (typically June), any remaining excess is paid at the Price-to-Compare (PTC) rate — roughly $0.11-0.13/kWh. Goal: right-size your system to roughly match annual consumption, not to overproduce.
Erie is the most challenging solar market in Pennsylvania. It has the state's lowest sun hours (~3.5 PSH), the most annual snowfall (100+ inches), and one of the lower utility rates (Penelec ~$0.19/kWh). Payback runs 15-17 years in Erie vs. 11-13 in Philadelphia. Solar can still work in Erie — many homeowners offset 60-70% of their electricity — but you need a larger system to compensate for lower production, and the economics are tighter. A ground mount with self-cleaning steep tilt may help in Erie specifically.
No. Quality solar panels are tested for temperature cycling from -40°F to +185°F and rated for at least IEC 61215 standards. PA winters, even in Erie, rarely approach -20°F. Properly installed systems handle freeze-thaw cycles for 25-30 years. The bigger winter weather risks in PA are ice dams from improper installation (ensure adequate underroof ventilation), heavy wet snow on flat or low-pitch roofs (racking must be rated appropriately), and branches/ice falling from overhanging trees.
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