Portes d Onne-1920
📍 Rhone-Alpes , Departement de la Haute-Savoie · Nearest city: Chatel (2 km)
61 XC score / 100 · takeoff at 1920 m · 📍 View on map
Coordinates and external links
46.28260, 6.86450Forecast next days
Updated: 2026-05-02 16:06 UTC · Source: Open-Meteo · Thermal window 10:00–18:00 local time
Not recommended for flying, cloud base ~213 m, wind 7 km/h, precipitation 3.7 mm.
base ~213m · wind 7 km/h · precip 3.7mmNot recommended for flying, cloud base ~512 m, wind 5 km/h, precipitation 4.9 mm.
base ~512m · wind 5 km/h · precip 4.9mmComposite flyability score (CAPE + LI + wind + precip + low clouds). Cross-check with local pilots before flying.
🌬 Daily wind (next days)
Daily summary (10m wind). Full hour × altitude chart is being added progressively.
Takeoff orientations
Green = good orientation · Yellow = possible · Gray = not suitable
🗓️ Best season to fly (2024 climatology)
Monthly climate score: historical avg of temp, wind, rain and cloud cover. Green = optimal month.
⭐ Best month: Aug (80/100, 18°C, 122mm lluvia) · Worst month: Dec (20/100, 172mm lluvia)
Why this site has thermal potential
| Factor | Value | Interpretation |
|---|---|---|
| Hotspot density (5 km) | 10 | High |
| Avg thermal probability | 0.85 | Based on thousands of aggregated IGC flights |
| Solar orientation | 0.38 | Slope faces south in northern hemisphere |
| Own flight history | 0.00 | Thermals detected in platform IGC tracks |
Nearby sites
Vionnaz Frassette Lieu-dit Pro-de-Chaud (56) · Pointe de Bellevue-2030 (43) · Mayen (60) · Vionnaz Turn (56) · Croix de l Aiguille (61) · Les Pétis (55)