Location data · Baden-Württemberg
Sun hours in Ulm
How sunny is Ulm? Over a year the sun delivers 1,403 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 3.84 peak sun hours per day in Ulm. In 9 out of 10 years at least 1,288 kWh/m² are reached. All values are computed from this location’s satellite hourly data, not estimated.
- Annual average (PSH)
- 3.84 kWh/m²/d
- P90 annual total
- 1,288 kWh/m²
- Optimal tilt
- 35°
- 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) | 1.52 | 2.62 | 4.00 | 5.13 | 5.20 | 5.78 | 5.72 | 5.25 | 4.59 | 3.03 | 1.77 | 1.43 |
| P90 | 1.17 | 1.68 | 2.93 | 4.19 | 4.31 | 5.01 | 4.95 | 4.43 | 3.86 | 2.52 | 1.50 | 1.14 |
Daily average per month in kWh/m² at 35° tilt, south-facing, including the terrain horizon of Ulm. P90 = reached in 9 out of 10 years.
Optimal tilt angle in Ulm
The annual optimum for Ulm is 35° south; anything between 23° and 50° counts as equivalent (below 2% difference). For winter operation (off-grid) 60° is optimal, for summer use 20°. Flat-laid modules lose 14.6 % versus the optimum. Adjusting twice a year would add 2.7 % here, monthly adjustment 3.5 % — only relevant for adjustable mounts.
Is a balcony solar kit worth it in Ulm?
A vertical south-facing railing in Ulm harvests 982 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 104 % 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
- Senden3.87 kWh/m²/d9 km
- Ehingen an der Donau3.89 kWh/m²/d23 km
- Geislingen an der Steige3.82 kWh/m²/d28 km