In the Andes, Height Does Not Buy You More Snow. It Buys You Snow Instead of Rain.

Every ski region has a rule about altitude, and in most of them the rule is the obvious one: go higher, get more snow. The Alps work that way. Australia works that way, sharply.

South America does not. We measured all 24 ski areas in Chile and Argentina the same way, and height does not buy more snowfall — the low group actually gets more. What it moves is whether that precipitation arrives as snow or as rain, and it moves that enormously.

	Ski areas	Elevation	Snowfall	Rain days	Temperature when snowing
2,500 m and above	8	2,760 m	307 cm	2%	−3.0 °C
Below 2,000 m	15	1,584 m	387 cm	30%	−1.2 °C

Each figure is the middle value of the group.

The low group gets more snow. Not less — more. If you booked on the snowfall column you would pick the bottom row, and you would be booking rain on nearly one winter day in three.

The whole list, sorted by height

Elevation		Snowfall	Rain days	Quality rank
3,200 m	Valle Nevado 🇨🇱	278 cm	3%	96
3,000 m	Portillo 🇨🇱	326 cm	2%	77
2,977 m	Los Penitentes 🇦🇷	300 cm	1%	97
2,762 m	Chapa Verde 🇨🇱	332 cm	9%	178
2,757 m	El Colorado 🇨🇱	278 cm	3%	157
2,743 m	La Parva 🇨🇱	278 cm	3%	161
2,734 m	Los Puquios 🇦🇷	314 cm	1%	163
2,600 m	Las Leñas 🇦🇷	469 cm	1%	43
2,248 m	Lagunillas 🇨🇱	328 cm	9%	222
1,841 m	Caviahue 🇦🇷	584 cm	13%	187
1,758 m	Corralco 🇨🇱	649 cm	30%	249
1,723 m	La Hoya 🇦🇷	208 cm	22%	286
1,700 m	Nevados de Chillán 🇨🇱	752 cm	22%	340
1,652 m	Cerro Perito Moreno 🇦🇷	476 cm	34%	237
1,611 m	Primeros Pinos 🇦🇷	231 cm	16%	376
1,604 m	Chapelco 🇦🇷	472 cm	21%	245
1,584 m	Batea Mahuida 🇦🇷	437 cm	30%	350
1,500 m	Cerro Catedral 🇦🇷	348 cm	30%	344
1,449 m	Volcán Osorno 🇨🇱	93 cm	65%	389
1,434 m	Pucón 🇨🇱	301 cm	58%	382
1,382 m	Cerro Bayo 🇦🇷	387 cm	42%	356
1,308 m	Antillanca 🇨🇱	577 cm	50%	265
667 m	Valdelén 🇦🇷	123 cm	19%	372
649 m	Cerro Castor 🇦🇷	147 cm	9%	366

Read the rain column from top to bottom. Across the eight highest it runs 3, 2, 1, 9, 3, 3, 1, 1. Below about 2,000 m it runs 13, 30, 22, 22, 34, 16, 21, 30, 30, 65, 58, 42, 50, and then drops back to 19 and 9 for the last two, which we come to below.

There is a line in the Andes at roughly 2,000 metres, and it is not a snowfall line. It is a rain line.

The two mountains that make the point

Nevados de Chillán gets 752 cm — the third-highest of the 3,069 ski areas we measure, behind FONNA in Norway and Okutadami Maruyama. It sits at 1,700 m and sees rain on 22% of winter days, and its snow falls at an average of +0.3 °C.

Valle Nevado gets 278 cm — 63% less. It sits at 3,200 m, sees rain on 3% of days, and its snow falls at −5.3 °C.

Two Chilean ski areas, 409 km apart. One has more than twice the snow. The other has the snow you flew for.

Las Leñas is the exception that explains the rule

Look again at row eight. Las Leñas: 469 cm, rain on 1% of days, 43rd of 456 for snow quality — the best in South America by a distance.

It is the only place in the Andes that gets the low-altitude snowfall total at high-altitude temperatures, and the reason is that it is both high (2,600 m) and far from the ocean, in the dry Mendoza cordillera. Everywhere else you are choosing one or the other.

The bottom two rows break the rule, and they break it consistently

Cerro Castor sits at 649 m and sees rain on 9% of winter days — better than every Chilean ski area below 2,000 m, and as dry as Chapa Verde and Lagunillas at 2,250–2,760 m. Valdelén, at 667 m, manages 19%.

Both are in far southern Patagonia: Castor at 55° south beside Ushuaia, Valdelén at 52° south near the Chilean border. Latitude is doing the job that altitude does further north. Six hundred metres in Tierra del Fuego is a colder place than 1,500 m in the lake district.

Castor gets 147 cm and Valdelén 123 cm a season, which is the trade, and it is why neither is a powder destination. We are including them because a rule that only holds where it is convenient is not a rule, and this exception has a plain explanation rather than being noise.

What to do with this

Do not choose an Andes resort from a snowfall figure. It is the one number the marketing leads with and the one number that will not separate a dry July from a wet one.

Above 2,500 m, you are choosing between good options. Portillo, Valle Nevado, El Colorado, La Parva, Los Penitentes and Las Leñas all sit at 1–3% rain days. The differences between them are terrain, crowds, price and whether you want to be 90 minutes from Santiago, not weather.

The Chilean lake district is a different holiday. Corralco, Antillanca, Osorno, Pucón — volcanoes, hot springs, forest, and rain on a third to two-thirds of winter days. People go for reasons other than the snow, and those reasons are good. Just do not go expecting the snow.

If you have skied the Alps, recalibrate. A 1,500 m base in Austria is a low resort. A 1,500 m base in Chile is a low resort in a maritime climate at 40° south, which is a much heavier penalty than the number suggests.

How this was measured

Snowfall is the twelve-winter average (June to September, 2015–2026) from the ERA5 reanalysis. Rain days, temperature and the quality rank cover the three most recent southern winters. A rain day is a day with 1 mm or more of rain. The quality rank places each ski area among the 456 we measure for snow quality — Japan’s 397 and the 59 below the equator, and combines temperature on snow days, how often 5 cm or more falls, how often it rains instead, and wind. Snowfall volume is deliberately excluded from it, which is exactly why this comparison is possible.

The elevation is one representative point for each ski area, not the top of the lifts. Valle Nevado’s lifts run well above the 3,200 m we record. Use these figures to compare ski areas with each other, not against the numbers on a resort’s own website.

Twenty-four ski areas is the whole of Chile and Argentina as we have it, not a sample, but it is still twenty-four, and a pattern across twenty-four places is weaker evidence than the same pattern across four hundred. We are reporting it because the split is large and it lines up with an ordinary physical explanation: air is colder higher up, and the Pacific-facing volcanoes sit low.

The model understates mountain snowfall. Checked against Japanese ground stations it returns roughly half of what they record, so every centimetre figure here is a floor. We have no ground check in South America, so treat the centimetres as indicative even though the totals are low.

A grid cell is roughly 30 km across, and El Colorado, La Parva and Valle Nevado sit inside one. Their identical 278 cm is one measurement shared three ways, not three that happen to agree. Where two ski areas in this table share a snowfall figure, we cannot tell them apart on snowfall — the ranking separates them only through the elevation correction applied to temperature.

Sources: Open-Meteo historical weather data, based on the ERA5 reanalysis (Copernicus Climate Change Service).