Location data · North Rhine-Westphalia
Sun hours in Dülmen
How sunny is Dülmen? Over a year the sun delivers 1,277 kilowatt-hours onto every square metre here — in June roughly 5 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 Dülmen. In 9 out of 10 years at least 1,204 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
- 1,204 kWh/m²
- Optimal tilt
- 40°
- Terrain horizon max.
- 4.6°
Sun hours per month
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PSH/day (35° south) | 1.23 | 2.16 | 3.50 | 4.85 | 5.16 | 5.39 | 5.26 | 4.82 | 4.06 | 2.78 | 1.65 | 1.08 |
| P90 | 0.93 | 1.62 | 2.82 | 4.02 | 4.37 | 4.70 | 4.71 | 4.22 | 3.55 | 2.30 | 1.33 | 0.81 |
Daily average per month in kWh/m² at 35° tilt, south-facing, including the terrain horizon of Dülmen. P90 = reached in 9 out of 10 years.
Optimal tilt angle in Dülmen
The annual optimum for Dülmen is 40° south; anything between 26° and 53° counts as equivalent (below 2% difference). For winter operation (off-grid) 70° is optimal, for summer use 20°. Flat-laid modules lose 16.7 % versus the optimum. Adjusting twice a year would add 3.2 % here, monthly adjustment 4.1 % — only relevant for adjustable mounts.
Is a balcony solar kit worth it in Dülmen?
A vertical south-facing railing in Dülmen harvests 935 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 122 % of the 35° December value, computed from the same hourly data with its own plane transposition. Open the balcony solar calculator with these coordinates →