Location data · North Rhine-Westphalia
Sun hours in Rietberg
How sunny is Rietberg? Over a year the sun delivers 1,296 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 3.55 peak sun hours per day in Rietberg. In 9 out of 10 years at least 1,213 kWh/m² are reached. All values are computed from this location’s satellite hourly data, not estimated.
- Annual average (PSH)
- 3.55 kWh/m²/d
- P90 annual total
- 1,213 kWh/m²
- Optimal tilt
- 40°
- Terrain horizon max.
- 3.1°
Sun hours per month
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PSH/day (35° south) | 1.21 | 2.20 | 3.59 | 4.89 | 5.22 | 5.52 | 5.28 | 4.89 | 4.15 | 2.83 | 1.63 | 1.12 |
| P90 | 0.88 | 1.52 | 2.82 | 4.15 | 4.49 | 4.84 | 4.50 | 4.34 | 3.56 | 2.30 | 1.19 | 0.78 |
Daily average per month in kWh/m² at 35° tilt, south-facing, including the terrain horizon of Rietberg. P90 = reached in 9 out of 10 years.
Optimal tilt angle in Rietberg
The annual optimum for Rietberg is 40° south; anything between 24° and 51° counts as equivalent (below 2% difference). For winter operation (off-grid) 65° is optimal, for summer use 20°. Flat-laid modules lose 14.9 % versus the optimum. Adjusting twice a year would add 3.0 % here, monthly adjustment 3.8 % — only relevant for adjustable mounts.
Is a balcony solar kit worth it in Rietberg?
A vertical south-facing railing in Rietberg harvests 937 kWh/m² per year — 72 % 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 119 % 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
- Lippstadt3.57 kWh/m²/d16 km
- Harsewinkel3.48 kWh/m²/d22 km
- Paderborn3.43 kWh/m²/d25 km