Location data · Saxony
Sun hours in Riesa
How sunny is Riesa? Over a year the sun delivers 1,380 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 3.78 peak sun hours per day in Riesa. In 9 out of 10 years at least 1,285 kWh/m² are reached. All values are computed from this location’s satellite hourly data, not estimated.
- Annual average (PSH)
- 3.78 kWh/m²/d
- P90 annual total
- 1,285 kWh/m²
- Optimal tilt
- 40°
- Terrain horizon max.
- 3.4°
Sun hours per month
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PSH/day (35° south) | 1.28 | 2.31 | 3.56 | 5.13 | 5.58 | 5.78 | 5.71 | 5.18 | 4.42 | 3.11 | 1.86 | 1.35 |
| P90 | 0.84 | 1.42 | 2.70 | 4.15 | 4.62 | 5.04 | 5.19 | 4.47 | 3.54 | 2.52 | 1.32 | 0.97 |
Daily average per month in kWh/m² at 35° tilt, south-facing, including the terrain horizon of Riesa. P90 = reached in 9 out of 10 years.
Optimal tilt angle in Riesa
The annual optimum for Riesa 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 15.4 % versus the optimum. Adjusting twice a year would add 3.0 % here, monthly adjustment 3.9 % — only relevant for adjustable mounts.
Is a balcony solar kit worth it in Riesa?
A vertical south-facing railing in Riesa harvests 999 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 114 % of the 35° December value, computed from the same hourly data with its own plane transposition. Open the balcony solar calculator with these coordinates →