Selected representative ERA5-Land grid cell at about 841 m; not a claim about every route across the region.
The existing model's best months. Compare the conditions below before choosing a route.
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| Month | Hiking-hour temperature | Wet days per month | Days with modelled snow | Daylight | Season guide |
|---|---|---|---|---|---|
| January → | 11.1°C | ≈ 14.7 | 12.4% | 15 h 18 min | Best month |
| February → | 11.5°C | ≈ 11.9 | 7.6% | 14 h 00 min | Best month |
| March → | 8.9°C | ≈ 15.4 | 16.6% | 12 h 24 min | Best month |
| April | 5.5°C | ≈ 16.1 | 55.2% | 10 h 48 min | No recommendation |
| May | 2.3°C | ≈ 18 | 85.2% | 9 h 24 min | No recommendation |
| June | -0.4°C | ≈ 18.8 | 99.1% | 8 h 42 min | No recommendation |
| July | -0.8°C | ≈ 18.5 | 100% | 9 h 00 min | No recommendation |
| August | 0.6°C | ≈ 19.2 | 100% | 10 h 12 min | No recommendation |
| September | 2.4°C | ≈ 17.4 | 100% | 11 h 48 min | No recommendation |
| October | 4.3°C | ≈ 16.9 | 99.5% | 13 h 24 min | No recommendation |
| November | 6.4°C | ≈ 16.2 | 95.1% | 14 h 54 min | No recommendation |
| December → | 9.4°C | ≈ 16.3 | 48.5% | 15 h 42 min | View month |
Historical climate at one selected model cell. Higher routes, sheltered valleys and exposed ridges can differ substantially.
Model elevation: 841 m · Historical period: 1991–2025
Trail wind is not available here. This model does not resolve exposed ridges or gusts; check a local mountain forecast.
Selected cell: -46.1, -72.2
Temperature sampling window (local time, limited to daylight): 08:00–18:00.
A wet day has at least 1 mm of total precipitation (including snow water equivalent). It may rain for only part of the day.
A snow day meets either model threshold: 10% snow cover or 2 cm snow depth.
Choose a specific route and check its distance, ascent, difficulty, current access and forecast. These are not supplied by the climate model.
The monthly value represents the selected representative ERA5-Land grid cell. It deliberately does not pretend to describe every route across the region.
-46.1, -72.2 · 841 m
The record for these months is complete. They carry no hiking score because at least one critical component is at or below 20, and we would rather say so here than publish a weak recommendation.
The hiking season at Cerro Castillo runs December to March. Because the destination is in the southern hemisphere, that falls across the northern winter. At about 840.8 metres, mean monthly temperature ranges from -1 in July to 12 in February.
In 8 of twelve months, snow lies on at least half the days at the selected grid cell. We withhold the rest of the year not because nothing happens there, but because snow cover turns the question from a hiking decision into a winter one.
The strongest scored month is February: about 12 degrees in the hiking window, rain on 42 percent of days, and 14 hours of daylight.
Every figure comes from one selected ERA5-Land model grid cell at -46.10, -72.20, 840.8 metres, averaged over 1991 to 2025. It describes that point rather than every route in the region, and it is not a forecast. Wind is coarse 10 metre grid wind, not a statement about exposed paths or gusts.
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