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Winter in the subtropics of South America


Sabal_Louisiana

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Of the the three major humid subtropical regions of the World:

The southeastern United States

East Asia (central and southern China, southern Japan, etc)

The Pampas of South America (northern Argentina, far southern Brazil, Paraguay, and Uruguay)

The last one listed is the least affected by severe cold waves and is also favored biologically since it is contiguous with the Neotropics.

Even so, I am mildly surprised that the subtropical latitudes of South America are not immune to moderately low temperatures, even brief freezes.

For instance, at the end of June 2021, a cold snap brought temperatures down to 0.8C at Asuncion and -1 at the airport near Iguazu Falls at the northern tip of Argentina.

Both locations are inland, away from the coast, but at about the same distance from the equator as Miami, Florida. All time record lows for these places would be around 25F/-4C so I would say that the temps experienced a couple of weeks ago are worthy of note.

The recent cold appears to be somewhat localized because Porto Alegre, Brazil at 30S latitude, but very close to the Atlantic, got no lower than 5C, even though they had cold rain with a high temp of only 10C on the last day of June.

Even Buenos Aires, some distance to the south, comparable in latitude to Little Rock or Osaka bottomed out at around 3C. Earlier in the season, B.A. fell to about 1.6C and that is the lowest they've seen this winter so far.

Like the southern United States, the coldest temperatures of the winter season in warm temperate parts of South America typically occur around or just after the solstice and less so during latter part of the season.

In East Asia by contrast, February is usually the coldest month.

Edited by Sabal_Louisiana
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