Location data · Grisons
Sun hours in Chur
How sunny is Chur? Over a year the sun delivers 1,278 kilowatt-hours onto every square metre here — in June roughly 10 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 3.50 peak sun hours per day in Chur. In 9 out of 10 years at least 1,230 kWh/m² are reached. All values are computed from this location’s satellite hourly data, not estimated.
- Annual average (PSH)
- 3.50 kWh/m²/d
- P90 annual total
- 1,230 kWh/m²
- Optimal tilt
- 30°
- Terrain horizon max.
- 38.2°
Sun hours per month
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PSH/day (35° south) | 0.74 | 1.92 | 4.15 | 5.28 | 5.23 | 5.55 | 5.81 | 5.08 | 4.30 | 2.57 | 0.76 | 0.53 |
| P90 | 0.66 | 1.67 | 3.80 | 4.71 | 4.72 | 4.75 | 4.88 | 4.42 | 3.87 | 2.19 | 0.70 | 0.40 |
Daily average per month in kWh/m² at 35° tilt, south-facing, including the terrain horizon of Chur. P90 = reached in 9 out of 10 years.
Optimal tilt angle in Chur
The annual optimum for Chur is 30° south; anything between 16° and 42° counts as equivalent (below 2% difference). For winter operation (off-grid) 35° is optimal, for summer use 20°. Flat-laid modules lose 9.0 % versus the optimum. Adjusting twice a year would add 1.1 % here, monthly adjustment 1.7 % — only relevant for adjustable mounts.
Is a balcony solar kit worth it in Chur?
A vertical south-facing railing in Chur harvests 815 kWh/m² per year — 64 % 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 60 % 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/d43 km
- Dornbirn3.92 kWh/m²/d65 km
- St. Gallen3.91 kWh/m²/d65 km