Location data · Fribourg
Sun hours in Freiburg
How sunny is Freiburg? Over a year the sun delivers 1,493 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 4.09 peak sun hours per day in Freiburg. In 9 out of 10 years at least 1,408 kWh/m² are reached. All values are computed from this location’s satellite hourly data, not estimated.
- Annual average (PSH)
- 4.09 kWh/m²/d
- P90 annual total
- 1,408 kWh/m²
- Optimal tilt
- 40°
- Terrain horizon max.
- 6.5°
Sun hours per month
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PSH/day (35° south) | 2.65 | 3.71 | 4.48 | 4.84 | 4.49 | 5.16 | 5.37 | 5.02 | 4.65 | 3.86 | 2.63 | 2.23 |
| P90 | 2.08 | 3.22 | 3.70 | 3.82 | 3.67 | 4.29 | 4.71 | 4.07 | 4.24 | 3.19 | 2.03 | 1.56 |
Daily average per month in kWh/m² at 35° tilt, south-facing, including the terrain horizon of Freiburg. P90 = reached in 9 out of 10 years.
Optimal tilt angle in Freiburg
The annual optimum for Freiburg is 40° south; anything between 28° and 54° counts as equivalent (below 2% difference). For winter operation (off-grid) 65° is optimal, for summer use 15°. Flat-laid modules lose 18.7 % versus the optimum. Adjusting twice a year would add 4.2 % here, monthly adjustment 5.3 % — only relevant for adjustable mounts.
Is a balcony solar kit worth it in Freiburg?
A vertical south-facing railing in Freiburg harvests 1,107 kWh/m² per year — 74 % 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 121 % of the 35° December value, computed from the same hourly data with its own plane transposition. Open the balcony solar calculator with these coordinates →