Location data · Vaud
Sun hours in Montreux
How sunny is Montreux? Over a year the sun delivers 1,656 kilowatt-hours onto every square metre here — in June roughly 2 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 4.54 peak sun hours per day in Montreux. In 9 out of 10 years at least 1,589 kWh/m² are reached. All values are computed from this location’s satellite hourly data, not estimated.
- Annual average (PSH)
- 4.54 kWh/m²/d
- P90 annual total
- 1,589 kWh/m²
- Optimal tilt
- 40°
- Terrain horizon max.
- 32.1°
Sun hours per month
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PSH/day (35° south) | 3.02 | 4.27 | 4.96 | 5.51 | 5.01 | 5.67 | 5.90 | 5.53 | 5.13 | 4.23 | 2.86 | 2.35 |
| P90 | 2.39 | 3.51 | 3.96 | 4.46 | 4.40 | 4.84 | 5.14 | 4.63 | 4.72 | 3.53 | 2.22 | 1.72 |
Daily average per month in kWh/m² at 35° tilt, south-facing, including the terrain horizon of Montreux. P90 = reached in 9 out of 10 years.
Optimal tilt angle in Montreux
The annual optimum for Montreux is 40° south; anything between 29° and 55° counts as equivalent (below 2% difference). For winter operation (off-grid) 70° is optimal, for summer use 20°. Flat-laid modules lose 20.3 % versus the optimum. Adjusting twice a year would add 4.4 % here, monthly adjustment 5.4 % — only relevant for adjustable mounts.
Is a balcony solar kit worth it in Montreux?
A vertical south-facing railing in Montreux harvests 1,236 kWh/m² per year — 75 % 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 119 % of the 35° December value, computed from the same hourly data with its own plane transposition. Open the balcony solar calculator with these coordinates →