Location data · North Rhine-Westphalia
Sun hours in Siegen
How sunny is Siegen? Over a year the sun delivers 1,246 kilowatt-hours onto every square metre here — in June roughly 6 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 3.41 peak sun hours per day in Siegen. In 9 out of 10 years at least 1,164 kWh/m² are reached. All values are computed from this location’s satellite hourly data, not estimated.
- Annual average (PSH)
- 3.41 kWh/m²/d
- P90 annual total
- 1,164 kWh/m²
- Optimal tilt
- 35°
- Terrain horizon max.
- 8.4°
Sun hours per month
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PSH/day (35° south) | 1.09 | 2.10 | 3.48 | 4.82 | 4.96 | 5.38 | 5.28 | 4.81 | 4.08 | 2.60 | 1.36 | 0.92 |
| P90 | 0.75 | 1.53 | 2.62 | 4.01 | 4.16 | 4.62 | 4.58 | 4.11 | 3.43 | 2.06 | 0.99 | 0.66 |
Daily average per month in kWh/m² at 35° tilt, south-facing, including the terrain horizon of Siegen. P90 = reached in 9 out of 10 years.
Optimal tilt angle in Siegen
The annual optimum for Siegen is 35° south; anything between 21° and 48° counts as equivalent (below 2% difference). For winter operation (off-grid) 60° is optimal, for summer use 20°. Flat-laid modules lose 12.5 % versus the optimum. Adjusting twice a year would add 2.2 % here, monthly adjustment 3.0 % — only relevant for adjustable mounts.
Is a balcony solar kit worth it in Siegen?
A vertical south-facing railing in Siegen harvests 866 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 116 % 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
- Kreuztal3.33 kWh/m²/d11 km
- Olpe3.39 kWh/m²/d21 km
- Dillenburg3.50 kWh/m²/d24 km