Location data · Vienna
Sun hours in Wien
How sunny is Wien? Over a year the sun delivers 1,435 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 3.93 peak sun hours per day in Wien. In 9 out of 10 years at least 1,364 kWh/m² are reached. All values are computed from this location’s satellite hourly data, not estimated.
- Annual average (PSH)
- 3.93 kWh/m²/d
- P90 annual total
- 1,364 kWh/m²
- Optimal tilt
- 35°
- Terrain horizon max.
- 16.4°
Sun hours per month
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PSH/day (35° south) | 1.50 | 2.71 | 4.08 | 5.35 | 5.40 | 5.87 | 6.00 | 5.51 | 4.70 | 3.18 | 1.70 | 1.15 |
| P90 | 1.24 | 2.05 | 3.32 | 4.71 | 4.55 | 5.06 | 5.33 | 4.96 | 3.98 | 2.59 | 1.45 | 1.00 |
Daily average per month in kWh/m² at 35° tilt, south-facing, including the terrain horizon of Wien. P90 = reached in 9 out of 10 years.
Optimal tilt angle in Wien
The annual optimum for Wien is 35° south; anything between 22° and 48° counts as equivalent (below 2% difference). For winter operation (off-grid) 55° is optimal, for summer use 20°. Flat-laid modules lose 13.2 % versus the optimum. Adjusting twice a year would add 2.0 % here, monthly adjustment 2.4 % — only relevant for adjustable mounts.
Is a balcony solar kit worth it in Wien?
A vertical south-facing railing in Wien harvests 978 kWh/m² per year — 68 % 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 95 % 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
- Baden4.07 kWh/m²/d25 km
- Wiener Neustadt3.99 kWh/m²/d46 km
- St. Pölten3.94 kWh/m²/d54 km