Location data · Thuringia
Sun hours in Jena
How sunny is Jena? Over a year the sun delivers 1,335 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 3.66 peak sun hours per day in Jena. In 9 out of 10 years at least 1,249 kWh/m² are reached. All values are computed from this location’s satellite hourly data, not estimated.
- Annual average (PSH)
- 3.66 kWh/m²/d
- P90 annual total
- 1,249 kWh/m²
- Optimal tilt
- 40°
- Terrain horizon max.
- 3.8°
Sun hours per month
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PSH/day (35° south) | 1.43 | 2.40 | 3.61 | 4.90 | 5.29 | 5.55 | 5.44 | 4.93 | 4.25 | 2.90 | 1.78 | 1.33 |
| P90 | 1.09 | 1.73 | 2.79 | 3.94 | 4.63 | 4.83 | 4.80 | 4.23 | 3.58 | 2.31 | 1.37 | 1.08 |
Daily average per month in kWh/m² at 35° tilt, south-facing, including the terrain horizon of Jena. P90 = reached in 9 out of 10 years.
Optimal tilt angle in Jena
The annual optimum for Jena is 40° south; anything between 25° and 52° counts as equivalent (below 2% difference). For winter operation (off-grid) 65° is optimal, for summer use 20°. Flat-laid modules lose 16.2 % versus the optimum. Adjusting twice a year would add 3.8 % here, monthly adjustment 4.3 % — only relevant for adjustable mounts.
Is a balcony solar kit worth it in Jena?
A vertical south-facing railing in Jena harvests 975 kWh/m² per year — 73 % 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 →