Draceane · CC BY-SA 4.0 · Wikimedia Commons
Stratovolcano in Chile
Osorno is a volcano in the Patagonian Andes (Chile). Its summit stands 2,652 m above sea level. It was first climbed in 1848.
From the lowest point within 5 km (498 m), it rises 2,154 m. The steepest side is the north face: 35° on average over the first kilometre. In places the ground near the top reaches 45° — terrain for climbers, not walkers.
The nearest town is La Ensenada, 12 km away at 58 m: 2,594 m below the summit.
Scores
Two scores out of 10, built only from open data — every part is shown. They describe what the mountain offers, not how safe it is.
Hiking & mountaineering
6.4/10
Difficulty to the top
Alpine climb
Glaciers around the top.
Indicative only — never a safety assessment. Conditions change: ask local guides and check the forecast.
Ski score
1.5/10
Runs by difficulty
Snow season on the slopes (estimate)
Around 558 m, in the middle of the ski area: no snow.
2 lifts · 0 km cross-country
Ski (where OpenStreetMap has skiing within 12 km): up to 4 points for the length of downhill runs (300 km or more = 4), 1.5 for the number of lifts (40+), 1.5 for the vertical between lift stations (1,500 m) and 3 for the snow season — a month counts when the estimated mean temperature at the height of the ski area is −1 °C or lower and snow falls or lies there (NASA POWER, 2001–2020). Hiking & mountaineering: up to 2.5 for waymarked routes and paths, 1.5 for huts, 2 for the ascent from the valley (2,000 m), 1.5 for prominence (3,000 m), 1.5 for the season (months with summit afternoons above −5 °C) and 1 for via ferratas, climbing and glaciers. OpenStreetMap is built by volunteers: where few things are mapped, a score can be lower than reality.
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Snow
At the summit, snow all year round. Month by month below, at different heights on the way up.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Summit2,652 msnow all year round | Snow on the ground all month | Snow on the ground all month | Snow on the ground all month | Snow on the ground all month | Snow on the ground all month | Snow on the ground all month | Snow on the ground all month | Snow on the ground all month | Snow on the ground all month | Snow on the ground all month | Snow on the ground all month | Snow on the ground all month |
Halfway up1,355 msnow from June to October (some years from May to November) | No snow | No snow | No snow | No snow | Snow some of the time | Snow on the ground all month | Snow on the ground all month | Snow on the ground all month | Snow on the ground all month | Snow on the ground all month | Snow some of the time | No snow |
La Ensenada58 mno snow | No snow | No snow | No snow | No snow | No snow | No snow | No snow | No snow | No snow | No snow | No snow | No snow |
Estimate for a normal year: average temperature and precipitation from NASA POWER, carried to each height, in a simple model of snow building up and melting. In a given year snow can come earlier or stay longer. It does not replace the local snow and avalanche bulletin.
Summit weather
Not a forecast: long-term averages (1991–2020), carried up to the summit. The orange line is where an average afternoon reaches 0 °C; above the dashed blue line it freezes even at dawn.
On an average February afternoon the summit reaches about 6 °C; on July nights it falls to about -13 °C. In 7 months of the year it stays below freezing at the top even in the afternoon. In February the 0 °C line climbs to about 3,640 m, above the summit: the top thaws on an average afternoon. Across the region, February is the driest month (44 mm) and June the wettest (167 mm).
| Month | Summit high °C | Summit low °C | La Ensenada high °C | 0 °C line (m) | Rain & snow (mm) | Wet days | Sun h/day |
|---|---|---|---|---|---|---|---|
| January | 5 | -5 | 22 | 3,490 | 50 | 9 | 10.1 |
| February | 6 | -5 | 23 | 3,640 | 44 | 7 | 8.9 |
| March | 4 | -6 | 21 | 3,240 | 65 | 11 | 7.1 |
| April | 0 | -8 | 17 | 2,610 | 92 | 14 | 4.9 |
| May | -4 | -10 | 13 | 2,100 | 143 | 17 | 3.0 |
| June | -7 | -12 | 10 | 1,610 | 167 | 20 | 2.1 |
| July | -8 | -13 | 9 | 1,500 | 154 | 18 | 2.7 |
| August | -6 | -12 | 10 | 1,670 | 146 | 18 | 3.3 |
| September | -4 | -11 | 13 | 2,060 | 80 | 15 | 5.4 |
| October | -2 | -10 | 15 | 2,360 | 82 | 14 | 6.0 |
| November | 0 | -8 | 17 | 2,720 | 67 | 12 | 7.4 |
| December | 3 | -6 | 20 | 3,120 | 56 | 11 | 9.0 |
Estimate: the NASA POWER climate of a ~55 km cell (average height 441 m), adjusted to the summit by −6.5 °C per 1,000 m. Rain, wet days and sunshine are those of the region. Mountain weather changes fast — always check a local forecast. ★ = mildest months at the top.
Relief
Two cuts through the summit, 16 km long, from the 30 m Copernicus elevation model. True scale: no vertical exaggeration.
Average slope of the first kilometre from the summit. The orange petal is the steepest side.
Around the mountain
Counted around the summit in OpenStreetMap, the map anyone can edit. The satellite plate shows 14 × 14 km.
N
5 km
Sentinel-2 cloudless 2016 (EOX, CC BY 4.0), 14 × 14 km, north up. Points © OpenStreetMap contributors.
Antigua Sala de Máquinas
Telesilla Enlace, Telesilla Glaciar
Volcán Osorno
Paso Desolación
La Máquina
Cráter La Burbuja, Mirador El Bosque, Lago Todos los Santos, Mirador Pirepillan and 11 more
camping Petrohue
Petrohué Lodge, Refugio Los Pumas, Refugio Teski, Hotel-Spa Nido de Cóndor and 1 more
4 path sections within 5 km, by SAC hiking scale (T1 easy walk … T6 difficult alpine).
OpenStreetMap is built by volunteers: a low number may just mean nobody has mapped it yet. Places © OpenStreetMap contributors (ODbL).
Recent years
Afternoon high at the summit (estimate). The first row is the reference, the 1991–2020 average in °C; the years show only the difference.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1991–2020 average | 5 | 6 | 4 | 0 | -4 | -7 | -8 | -6 | -4 | -2 | 0 | 3 |
| 2020 | +0.8 | +0.1 | +2.2 | +1.4 | +0.8 | −0.9 | −1.3 | −0.4 | +0.5 | +0.9 | +1.8 | +0.4 |
| 2021 | +1.2 | +3.7 | +3.8 | +2.1 | +1.6 | +0.8 | +1.2 | +1.0 | +1.1 | +2.4 | +2.9 | +5.7 |
| 2022 | +2.4 | +1.4 | −0.9 | −1.7 | −0.5 | −0.3 | −1.5 | +0.1 | +0.2 | +1.5 | +6.0 | +4.0 |
| 2023 | +3.3 | +1.8 | +0.9 | +2.2 | +1.0 | +1.2 | +0.7 | −0.3 | −1.4 | −0.3 | −1.3 | +2.8 |
| 2024 | +3.6 | +3.8 | −0.6 | −0.8 | −3.3 | +0.3 | −0.4 | +0.5 | −1.9 | +2.6 | +0.1 | +2.4 |
| 2025 | +3.0 | −0.1 | +0.7 | +0.2 | −1.6 | −0.6 | +1.7 | +2.5 | +0.8 | +0.1 | +2.6 | +0.8 |
+1 warmer than usual −1 cooler than usual
| Names, elevation, prominence | Wikidata (Q858808) · CC0 |
|---|---|
| Relief, 3D view, profiles | Copernicus DEM GLO-30 · © DLR e.V., © Airbus Defence and Space GmbH, Copernicus/ESA |
| Climate | NASA POWER, 1991–2020 · CC BY 4.0 |
| Around the mountain | © OpenStreetMap contributors · ODbL |
| Images | EOX Sentinel-2 cloudless 2016 · CC BY 4.0; Wikimedia Commons |
Every figure is an average, an estimate or a count from a public dataset. Licences and methods: data sources.
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