Grand Som
📍 Rhone-Alpes , Departement de l'Isere · Nearest city: Saint-Laurent-du-Pont (6 km)
50 XC score / 100 · takeoff at 1578 m · 📍 View on map
Coordinates and external links
45.37190, 5.81278Forecast next days
Updated: 2026-05-02 16:23 UTC · Source: Open-Meteo · Thermal window 10:00–18:00 local time
Not recommended for flying, cloud base ~254 m, wind 14 km/h, precipitation 9.0 mm.
base ~254m · wind 14 km/h · precip 9.0mmNot recommended for flying, cloud base ~262 m, wind 6 km/h, precipitation 13.7 mm.
base ~262m · wind 6 km/h · precip 13.7mmComposite 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 (81/100, 18°C, 72mm lluvia) · Worst month: Dec (20/100, 154mm lluvia)
Why this site has thermal potential
| Factor | Value | Interpretation |
|---|---|---|
| Hotspot density (5 km) | 10 | High |
| Avg thermal probability | 0.77 | Based on thousands of aggregated IGC flights |
| Solar orientation | 0.11 | Slope faces south in northern hemisphere |
| Own flight history | 0.00 | Thermals detected in platform IGC tracks |
Takeoff description
alti:1989m From the landing go to 'Saint Pierre de Chartreuse' village and cross it. Take the D102b road to the north ('Saint Pierre d'Entremont' direction) and stop on the 'Cucheron' pass. Walk and follow the sign 'Grand Son' summit during 3h. grass slope just before the summit.
Nearby sites
Saint Pierre de Chartreuse - La Scia (70) · Pravouta (72) · Charmant Som (47) · La Dent de Crolles (64) · Col de Baure (48) · Bande (45)