Southern Tier · Southern Tier Hills
Tioga County weather and solar
What the climate here actually does to a solar array — production by season, the structural spec the snow load forces, and the roof decisions that follow from both.
The climate
Southern Tier Hills
Specific yield
1,050–1,170 kWh / kW-DC / yr
A 10 kW array averages about 11,100 kWh a year here.
Modeled NREL PVWatts v8 · verified Jan 2026
Mean annual snowfall
70–120 inches
Moderate lake-effect exposure from Lake Erie, weakening with distance inland.
Modeled NOAA/NWS seasonal snowfall records · verified Jan 2026
Design ground snow load
50–70 psf
Racking and structural review are engineered to this figure. Ask which number your proposal used.
Filed ASCE 7 ground snow load data · verified Jan 2026
Winter quarter share
10% of annual
December, January, and February combined.
Derived NREL PVWatts v8 · verified Jan 2026
Days with snow on the array
25–55 per season
Far fewer than days with snow on the ground — panels shed.
Observed GridReady quote and bill review sample · verified Jan 2026
Seasonality
Production month by month on a 10 kW array
kWh per month from a 10 kW-DC array at the midpoint of the Southern Tier Hills yield band. Bar height is relative to the peak month.
Show the arithmetic
10 kW × 1,110 kWh/kW/yr (midpoint of the Southern Tier Hills band) = 11,100 kWh a year, distributed on a northern-temperate seasonal curve anchored so December through February sums to 10% of the total.
A modeled shape, not a measurement of your roof. Orientation, pitch, and shading move individual months more than they move the annual total.
Derived NREL PVWatts v8 · verified Jan 2026
Local weather
What the weather here specifically does
- Valley locations here lose real production to terrain shading, not just trees. A house on the north side of a steep valley can lose its December sun entirely for weeks.
- This is the most outage-prone terrain in the state: long overhead rural feeders through mature woods, on hills, in ice country.
- Winter fog and low stratus in the valleys is a genuine, underappreciated production loss that satellite-based estimates handle poorly.
The roof
Consequences for the array itself
- Insist on a real shade study — a horizon profile, not just a tree-canopy guess. Terrain shading is the local specialty.
- Ground mounts are more common here because lots are large and roof orientations are often poor. Trenching distance becomes the cost driver.
- Well pumps and septic systems mean an outage here takes your water with it. That changes the backup conversation.
The one question worth asking every installer here
“What ground snow load is this racking engineered for, and can I see the stamped calculation?” The right answer in Tioga County is 50–70 psf. At this load, structural review is genuine engineering and some roofs will need reinforcement. That is a finding, not a sales objection.
Questions
Tioga County climate FAQ
- How much does snow reduce solar production in Tioga County?
- Less than most people expect. A pitched array here sees roughly 25 to 55 days a season with enough cover to stop production — the glass is slick and the array runs warmer than the shingles around it. Cloud cover through November and December costs more production than snow cover does. What snow really drives is the structural spec: design ground snow load here is 50 to 70 psf, and racking must be engineered and stamped for it.
- What is the seasonal production curve in Tioga County?
- Jul is the strongest month and Dec the weakest, by roughly 4.4 to one. December through February combined account for about 10% of annual output — roughly one month's worth of production spread across three months. A proposal that shows a smooth, near-flat monthly production curve for this county is not modeling this climate.
- Is Tioga County too far north or too cloudy for solar?
- No, but the honest framing is that the climate sets the ceiling and the electricity rate sets the value. A 10 kW array here produces roughly 11,100 kWh a year. That is real output — the question is what a kWh is worth where you live, which is a rate question rather than a weather one.
- How does lake-effect snow affect solar in Tioga County?
- Moderate exposure from Lake Erie, weakening with distance inland. Valley locations here lose real production to terrain shading, not just trees. A house on the north side of a steep valley can lose its December sun entirely for weeks.
- Does cold weather help or hurt solar panels in Tioga County?
- Cold helps efficiency — panels produce more per unit of sunlight at low temperature, which is why a clear February day can outperform a hazy July one on a per-hour basis. What hurts is daylight hours and cloud cover, and this climate is short on both between November and February. The two effects do not cancel out; the daylight loss dominates.
Next step
Turn this into your own numbers
The climate sets what a roof can produce. Your rate sets what that production is worth, and your roof sets how much of the band you actually get.
How this page is built
This is a generated page: the structure is shared across locations, the numbers are not. Every figure comes from the source cited beside it, with the date we last checked it. Nothing here is a quote, an appraisal, or tax advice, and none of it is specific to your roof.
Rates and incentive programs change. We re-verify utility tariffs and NYSERDA program status on a rolling schedule and stamp the date on each number rather than on the page, so you can see which specific figures are fresh. Full methodology · Program status tracker · About the Local Energy Playbook
Page content last reviewed April 2026.