PVGIS · SolarMapped
Solar potential in Switzerland
These figures are the unweighted mean of the city locations listed below, not a national average. Two urban points do not represent an entire country, its roofs or its solar installations.
Explore on the solar map ↗Sampled-city benchmark
PV output is estimated electricity from 1 kWp of installed solar panels. Irradiation is sunlight energy received per square meter on the optimally tilted panel plane; it is not electricity.
For a 5 kWp system, multiply the electricity values by five. This simple scaling does not account for roof-specific shading or equipment constraints.
Range across these cities: 1,152–1,276kWh/kWp/year. Panel tilt and direction are location-specific; see each city.
Monthly solar irradiation and PV output
Highest-output month: July · 139.6kWh/kWp/month. Lowest-output month: December · 45.9kWh/kWp/month.
The chart and table use the mean of the listed cities for each month.
| Month | Estimated PV output (kWh/kWp/month) | Solar irradiation (kWh/m²/month) |
|---|---|---|
| January | 58.3 | 68.2 |
| February | 77.6 | 92.8 |
| March | 113.2 | 138.3 |
| April | 126.5 | 160.3 |
| May | 127.9 | 164 |
| June | 133.8 | 176.2 |
| July | 139.6 | 185.9 |
| August | 131 | 173.5 |
| September | 116.6 | 150 |
| October | 88.4 | 110.1 |
| November | 55.8 | 67.4 |
| December | 45.9 | 54.6 |
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Data and methodology
PVGIS 5.3 (European Commission Joint Research Centre), crystalline silicon, fixed free-standing installation, 1 kWp, 14% system losses, equator-facing panels with optimized tilt and the terrain horizon. Long-term climate estimates are not a forecast or a roof survey. Nearby buildings, trees, roof constraints, snow and local conditions can change actual output.
- Zurich — Reference coordinates: 47.38, 8.54; Climate dataset / years: PVGIS-SARAH3 / 2005–2023; Data retrieved: .
- Geneva — Reference coordinates: 46.2, 6.14; Climate dataset / years: PVGIS-SARAH3 / 2005–2023; Data retrieved: .
PVGIS methodology · Sources and assumptions (English) · Download the underlying data (JSON)