Location data · St. Gallen
Sun hours in St. Gallen
How sunny is St. Gallen? Over a year the sun delivers 1,426 kilowatt-hours onto every square metre here — in June roughly 3 times as much per day as in December. “Sun hours” has two meanings: the weather report counts how long the sun shines. For solar power what matters is how much energy arrives — and that is what this page shows, as peak sun hours (hours of full sun power).
For solar planning this means: an optimally tilted, south-facing array (35°) harvests an annual average of 3.91 peak sun hours per day in St. Gallen. In 9 out of 10 years at least 1,329 kWh/m² are reached. All values are computed from this location’s satellite hourly data, not estimated.
- Annual average (PSH)
- 3.91 kWh/m²/d
- P90 annual total
- 1,329 kWh/m²
- Optimal tilt
- 35°
- Terrain horizon max.
- 12.6°
Sun hours per month
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PSH/day (35° south) | 1.83 | 3.04 | 4.10 | 5.04 | 5.00 | 5.55 | 5.63 | 5.18 | 4.60 | 3.24 | 2.00 | 1.64 |
| P90 | 1.30 | 2.33 | 3.09 | 3.84 | 4.23 | 4.67 | 4.82 | 4.32 | 3.94 | 2.63 | 1.58 | 1.13 |
Daily average per month in kWh/m² at 35° tilt, south-facing, including the terrain horizon of St. Gallen. P90 = reached in 9 out of 10 years.
Optimal tilt angle in St. Gallen
The annual optimum for St. Gallen is 35° south; anything between 24° and 50° counts as equivalent (below 2% difference). For winter operation (off-grid) 65° is optimal, for summer use 20°. Flat-laid modules lose 15.5 % versus the optimum. Adjusting twice a year would add 2.8 % here, monthly adjustment 3.5 % — only relevant for adjustable mounts.
Is a balcony solar kit worth it in St. Gallen?
A vertical south-facing railing in St. Gallen harvests 1,003 kWh/m² per year — 70 % of what an optimally tilted 35° panel yields at the same spot. December softens the penalty: with the low winter sun, the vertical plane reaches 99 % of the 35° December value, computed from the same hourly data with its own plane transposition. Open the balcony solar calculator with these coordinates →
Neighbouring places compared
- Feldkirch4.11 kWh/m²/d27 km
- Friedrichshafen4.08 kWh/m²/d27 km
- Dornbirn3.92 kWh/m²/d28 km