Location data · Bern
Sun hours in Bern
How sunny is Bern? Over a year the sun delivers 1,466 kilowatt-hours onto every square metre here — in June roughly 4 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 4.02 peak sun hours per day in Bern. In 9 out of 10 years at least 1,353 kWh/m² are reached. All values are computed from this location’s satellite hourly data, not estimated.
- Annual average (PSH)
- 4.02 kWh/m²/d
- P90 annual total
- 1,353 kWh/m²
- Optimal tilt
- 35°
- Terrain horizon max.
- 23.3°
Sun hours per month
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PSH/day (35° south) | 1.86 | 2.94 | 4.16 | 5.15 | 5.07 | 5.82 | 5.90 | 5.45 | 4.75 | 3.43 | 2.15 | 1.48 |
| P90 | 1.41 | 2.28 | 3.14 | 4.12 | 4.34 | 4.95 | 5.18 | 4.76 | 4.22 | 2.89 | 1.68 | 1.07 |
Daily average per month in kWh/m² at 35° tilt, south-facing, including the terrain horizon of Bern. P90 = reached in 9 out of 10 years.
Optimal tilt angle in Bern
The annual optimum for Bern is 35° south; anything between 23° and 49° counts as equivalent (below 2% difference). For winter operation (off-grid) 60° is optimal, for summer use 20°. Flat-laid modules lose 14.3 % versus the optimum. Adjusting twice a year would add 2.3 % here, monthly adjustment 3.1 % — only relevant for adjustable mounts.
Is a balcony solar kit worth it in Bern?
A vertical south-facing railing in Bern harvests 1,015 kWh/m² per year — 69 % 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 107 % of the 35° December value, computed from the same hourly data with its own plane transposition. Open the balcony solar calculator with these coordinates →