Location data · Hesse
Sun hours in Gießen
How sunny is Gießen? Over a year the sun delivers 1,359 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 3.72 peak sun hours per day in Gießen. In 9 out of 10 years at least 1,283 kWh/m² are reached. All values are computed from this location’s satellite hourly data, not estimated.
- Annual average (PSH)
- 3.72 kWh/m²/d
- P90 annual total
- 1,283 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) | 1.32 | 2.40 | 3.82 | 5.19 | 5.42 | 5.82 | 5.60 | 5.13 | 4.44 | 2.87 | 1.54 | 1.06 |
| P90 | 0.93 | 1.78 | 3.05 | 4.42 | 4.63 | 4.77 | 5.01 | 4.41 | 3.77 | 2.33 | 1.19 | 0.77 |
Daily average per month in kWh/m² at 35° tilt, south-facing, including the terrain horizon of Gießen. P90 = reached in 9 out of 10 years.
Optimal tilt angle in Gießen
The annual optimum for Gießen is 35° 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 15.3 % versus the optimum. Adjusting twice a year would add 2.6 % here, monthly adjustment 3.4 % — only relevant for adjustable mounts.
Is a balcony solar kit worth it in Gießen?
A vertical south-facing railing in Gießen harvests 969 kWh/m² per year — 71 % 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 →
Neighbouring places compared
- Wetzlar3.70 kWh/m²/d12 km
- Marburg3.56 kWh/m²/d26 km
- Dillenburg3.50 kWh/m²/d32 km