Location data · Lucerne
Sun hours in Luzern
How sunny is Luzern? Over a year the sun delivers 1,363 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 3.73 peak sun hours per day in Luzern. In 9 out of 10 years at least 1,254 kWh/m² are reached. All values are computed from this location’s satellite hourly data, not estimated.
- Annual average (PSH)
- 3.73 kWh/m²/d
- P90 annual total
- 1,254 kWh/m²
- Optimal tilt
- 35°
- Terrain horizon max.
- 22.9°
Sun hours per month
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PSH/day (35° south) | 1.63 | 3.06 | 4.13 | 4.91 | 4.78 | 5.36 | 5.41 | 4.97 | 4.36 | 3.16 | 1.88 | 1.14 |
| P90 | 1.27 | 2.54 | 3.40 | 4.00 | 4.08 | 4.47 | 4.70 | 4.16 | 3.77 | 2.58 | 1.41 | 0.94 |
Daily average per month in kWh/m² at 35° tilt, south-facing, including the terrain horizon of Luzern. P90 = reached in 9 out of 10 years.
Optimal tilt angle in Luzern
The annual optimum for Luzern is 35° south; anything between 23° and 49° counts as equivalent (below 2% difference). For winter operation (off-grid) 60° is optimal, for summer use 20°. Flat-laid modules lose 14.1 % versus the optimum. Adjusting twice a year would add 2.4 % here, monthly adjustment 3.0 % — only relevant for adjustable mounts.
Is a balcony solar kit worth it in Luzern?
A vertical south-facing railing in Luzern harvests 937 kWh/m² per year — 69 % 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 99 % 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
- Zürich4.03 kWh/m²/d40 km
- Aarau3.94 kWh/m²/d43 km
- Rapperswil SG3.94 kWh/m²/d44 km