Location data · Valais
Sun hours in Sitten
How sunny is Sitten? Over a year the sun delivers 1,517 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 4.16 peak sun hours per day in Sitten. In 9 out of 10 years at least 1,455 kWh/m² are reached. All values are computed from this location’s satellite hourly data, not estimated.
- Annual average (PSH)
- 4.16 kWh/m²/d
- P90 annual total
- 1,455 kWh/m²
- Optimal tilt
- 35°
- Terrain horizon max.
- 51.9°
Sun hours per month
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PSH/day (35° south) | 2.23 | 3.13 | 4.26 | 5.49 | 5.27 | 5.50 | 5.82 | 5.48 | 4.71 | 3.61 | 2.58 | 1.74 |
| P90 | 1.93 | 2.68 | 3.80 | 5.03 | 4.72 | 4.72 | 5.11 | 4.64 | 4.38 | 3.17 | 2.22 | 1.39 |
Daily average per month in kWh/m² at 35° tilt, south-facing, including the terrain horizon of Sitten. P90 = reached in 9 out of 10 years.
Optimal tilt angle in Sitten
The annual optimum for Sitten is 35° south; anything between 24° and 51° counts as equivalent (below 2% difference). For winter operation (off-grid) 60° is optimal, for summer use 25°. Flat-laid modules lose 15.9 % versus the optimum. Adjusting twice a year would add 2.1 % here, monthly adjustment 2.8 % — only relevant for adjustable mounts.
Is a balcony solar kit worth it in Sitten?
A vertical south-facing railing in Sitten harvests 1,058 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 84 % of the 35° December value, computed from the same hourly data with its own plane transposition. Open the balcony solar calculator with these coordinates →