Weather in South America 2023 and up

[Mark]

https://electroverse.substack.com/p/chile-enters-spring-after-31-feet
Meteorological spring has arrived in Chile with fresh powder still piling up across the Andes—and one resort recording its snowiest season in roughly half a century.

Portillo reported another 15 cm (5.9 in) in the latest 24 hours and 114 cm (44.9 in) over seven days, lifting its 2026 seasonal snowfall to 933 cm (30.6 ft). The resort says this is its biggest snowfall season in about 50 years.

The deep winter extends across Chile.

Valle Nevado has accumulated 534 cm (17.5 ft) this season, while La Parva reached 393 cm (12.9 ft) after another 5 cm (2 in) in 24 hours and 23 cm (9 in) over the past week.

Farther south, Nevados de Chillán—pictured—reported 15 cm (5.9 in) of fresh snow and a season total of 276 cm (9.1 ft).

And at Corralco, 105 cm (41 in) fell from Aug 27–30 alone, pushing upper-mountain snow depth to 464 cm (15.2 ft).

[Mark]

A fierce polar outbreak has driven temperatures deep below freezing across much of southern South America, breaking cold records, returning snow to southern Brazil and pushing wintry air beyond 20°S.

In Argentina, Tandil plunged to -7.8C (18F), setting a new daily cold record, smashing the previous -4C (24.8F) mark from 1973.

General Pico fell to -4.9C (23.2F) on Sept 6, breaking the previous daily record of -4C (24.8F) from 1975. Buenos Aires dropped to 2.4C (36.3F) the same day, also setting a new daily record.

On Sept 7, Concordia reached -1.6C (29.1F), breaking the old -0.4C (31.3F) record from 2008, while Monte Caseros fell to 1.9C (35.4F), beating 2.3C (36.1F), also from 2008.

And across northern Buenos Aires Province, temperatures fell as low as -6.1C (21F).

At Berdier, near Salto, -4.5C (23.9F) tied the lowest September temperature in at least 60 years, matching the mark set in 2019. Junín dropped to -4.9C (23.2F), Rojas to -4.5C and Chacabuco to -4C (24.8F).

Farther west, Mendoza was colder still. Monte Comán crashed to -8.3C (17.1F), Villa Atuel to -8C (17.6F) and Palermo Chico to -7.7C (18.1F), with damaging frost striking fruit-growing districts already entering bloom.

At Mendoza itself, the official station fell to 0C (32F) on Sept 7, tying the daily record set in 1973.

The cold also broke records across the Andes in Chile. Balmaceda plunged to -9.4C (15.1F) on Sept 5, beating the previous daily record of -9C (15.8F) from 1976. A day later it fell to -9C (15.8F), smashing the Sept 6 record of -7.2C (19F) set in 1994.

The freeze spilled into Uruguay, where INUMET logged -4.2C (24.4F) in Lavalleja and -3C (26.6F) in Florida. Freezing readings covered much of the country’s center, south and east, with frost even reaching parts of the north and northeast.

The polar air then surged into southern Brazil.

At São Joaquim, Santa Catarina, the historical Epagri/INMET station fell to -4C (24.8F) on Sept 7—the coldest Sept 7 in its 72-year record, beating the previous -3C (26.6F) set in 1973. Nearby Caminhos da Neve reached -5.9C (21.4F).
https://electroverse.substack.com/p/south-america-suffers-record-cold

[Mark]

An early-spring polar outbreak has driven Tandil, Argentina to its coldest September temperature on record.

Tandil Aerodrome plunged to -7.8C (18F) this week, beating the previous September low of -7.1C (19.2F) set on Sept 14, 2003. Records here date back to 1960.

The cold was widespread across Buenos Aires Province.

SMN observations had Coronel Suárez at -3.2C (26.2F), Azul at -2.8C (27F) and Junín at -2C (28.4F).

General Pico dropped to -4.9C (23.2F) on Sept 6, a new calendar-day record; Buenos Aires itself reached 2.4C (36.3F) that same morning, also a Sept 6 record; and Monte Caseros fell to 1.9C (35.4F) on Sept 7, its lowest reading on record for that date.

The polar air also crossed the Río de la Plata.

Uruguay posted -5C (23F), the country’s lowest September temperature in INUMET’s modern record (back to 1981), beating the -4.5C (23.9F) set at Durazno on Sept 2, 1990, and coming within 0.6C of the longer national September record of -5.6C (21.9F).

Winter may be over on the calendar, but across southern South America it is reluctant to leave.

Below are the 2m temperature anomalies forecast Sept 12 (GFS):
https://electroverse.substack.com/p/tandil-breaks-september-cold-record