Location data · Rhineland-Palatinate
Sun hours in Trier
How sunny is Trier? Over a year the sun delivers 1,277 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 3.50 peak sun hours per day in Trier. In 9 out of 10 years at least 1,166 kWh/m² are reached. All values are computed from this location’s satellite hourly data, not estimated.
- Annual average (PSH)
- 3.50 kWh/m²/d
- P90 annual total
- 1,166 kWh/m²
- Optimal tilt
- 35°
- Terrain horizon max.
- 20.6°
Sun hours per month
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PSH/day (35° south) | 1.25 | 2.19 | 3.51 | 4.83 | 4.98 | 5.36 | 5.35 | 4.83 | 4.25 | 2.73 | 1.52 | 1.11 |
| P90 | 1.00 | 1.48 | 2.73 | 3.94 | 4.20 | 4.57 | 4.77 | 4.20 | 3.72 | 2.09 | 1.07 | 0.77 |
Daily average per month in kWh/m² at 35° tilt, south-facing, including the terrain horizon of Trier. P90 = reached in 9 out of 10 years.
Optimal tilt angle in Trier
The annual optimum for Trier 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 14.2 % versus the optimum. Adjusting twice a year would add 2.5 % here, monthly adjustment 3.3 % — only relevant for adjustable mounts.
Is a balcony solar kit worth it in Trier?
A vertical south-facing railing in Trier harvests 892 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 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
- Merzig3.49 kWh/m²/d35 km
- Idar-Oberstein3.63 kWh/m²/d48 km
- Sankt Wendel3.71 kWh/m²/d50 km