Location data · North Rhine-Westphalia
Sun hours in Düren
How sunny is Düren? Over a year the sun delivers 1,373 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 3.76 peak sun hours per day in Düren. In 9 out of 10 years at least 1,298 kWh/m² are reached. All values are computed from this location’s satellite hourly data, not estimated.
- Annual average (PSH)
- 3.76 kWh/m²/d
- P90 annual total
- 1,298 kWh/m²
- Optimal tilt
- 40°
- Terrain horizon max.
- 5.3°
Sun hours per month
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PSH/day (35° south) | 1.51 | 2.58 | 3.80 | 5.04 | 5.27 | 5.60 | 5.43 | 4.94 | 4.45 | 3.12 | 1.99 | 1.36 |
| P90 | 1.06 | 1.84 | 3.08 | 4.37 | 4.50 | 4.85 | 4.92 | 4.43 | 3.98 | 2.60 | 1.53 | 1.03 |
Daily average per month in kWh/m² at 35° tilt, south-facing, including the terrain horizon of Düren. P90 = reached in 9 out of 10 years.
Optimal tilt angle in Düren
The annual optimum for Düren is 40° south; anything between 27° and 53° counts as equivalent (below 2% difference). For winter operation (off-grid) 70° is optimal, for summer use 20°. Flat-laid modules lose 17.6 % versus the optimum. Adjusting twice a year would add 3.3 % here, monthly adjustment 4.2 % — only relevant for adjustable mounts.
Is a balcony solar kit worth it in Düren?
A vertical south-facing railing in Düren harvests 1,008 kWh/m² per year — 73 % 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 112 % 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
- Kerpen3.73 kWh/m²/d16 km
- Stolberg, Rheinland3.47 kWh/m²/d19 km
- Alsdorf3.72 kWh/m²/d24 km