El Chalten weather by month
El Chalten runs from about -2°C in June to 12°C in February, with March the wettest month at 238 mm.
warmest month
February
12°C
coolest month
June
-2°C
wettest month
March
238 mm
worst air month
January
3 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 12°C | 161 mm | 346 h | 3 |
| February | 12°C | 134 mm | 272 h | 2 |
| March | 8°C | 238 mm | 222 h | 1 |
| April | 5°C | 170 mm | 187 h | 0 |
| May | -1°C | 45 mm | 208 h | 1 |
| June | -2°C | 149 mm | 84 h | 1 |
| July | 1°C | 194 mm | 121 h | 1 |
| August | 1°C | 61 mm | 191 h | 2 |
| September | 2°C | 156 mm | 196 h | 2 |
| October | 7°C | 93 mm | 272 h | 1 |
| November | 8°C | 96 mm | 323 h | 2 |
| December | 11°C | 66 mm | 370 h | 1 |
About 2,792 hours of sun a year. Roughly 157 rainy days a year.
These are long-run climate normals, not a forecast. A given year can sit well outside them. PM2.5 is a global model: near the coast it counts sea salt as fine particulate and reads high against ground stations, sometimes by a factor of two. Use the shape of the year, not the absolute number.
where these numbers come from
- · Temperature, rainfall and sunshine: ECMWF ERA5 reanalysis climate normals via Open-Meteo (CC BY 4.0), fetched once and stored.
- · PM2.5: Copernicus CAMS reanalysis, monthly means. Modelled, not station readings; near coasts CAMS counts sea salt as PM2.5 and reads high.
Last reviewed 2026-05-27. Full method, licences and the list of sources we rejected are on the methodology page.