Similar Climates › City Pairings › Jackson ≈ Porto Alegre
City Pairings
loose match
Jackson, Mississippi and Porto Alegre, Brazil are a loose climate match — 8,055 km (5,005 mi) apart. Jackson is Köppen zone Cfa; Porto Alegre is Cfa.
See Jackson on the interactive map →Jackson and Porto Alegre both sit in the humid subtropical (Cfa) zone, so their seasonal arcs line up. Because one city is in the opposite hemisphere, the comparison flips seasons: Jackson’s January against Porto Alegre’s July. Roughly 8,055 km (5,005 mi) separates them — far enough that Porto Alegre feels like another continent, close enough on the climate numbers to stand in for Jackson.
It is a loose match: useful as a climate analogue for Jackson, though not a perfect copy. January means differ by 6°C (Porto Alegre warmer); July by 2°C (Porto Alegre cooler). Rainfall shifts more: Porto Alegre is 25 mm wetter in July.
Sunshine stays close: Porto Alegre at 9.1 h/day on average versus 9.4 h/day in Jackson (January 7.1 h / 6.9 h, July 11 h / 11.8 h). PM2.5 averages stay near each other (10 µg/m³ in Porto Alegre, 11 in Jackson). Humidity: dew point in Porto Alegre runs about 8°C higher in January (11°C vs 3°C), so the air feels muggier.
January & July · °C and mm
Porto Alegre is in the southern hemisphere, so its July lines up with Jackson's January — the bars above pair each city's summer and winter, not the calendar month.
Compare Jackson and Porto Alegre month by month on the interactive map →
See Porto Alegre's climate twin on its own page.
On Similar Climates, Porto Alegre, Brazil is the closest distant match for Jackson, Mississippi — scored loose, about 8,055 km (5,005 mi) away.
Jackson and Porto Alegre are separated by roughly 8,055 km (5,005 mi) on the great-circle route.
No — they sit in opposite hemispheres, so seasons run about six months apart: Porto Alegre’s July pairs with Jackson’s January in the comparison.
Yes — both are humid subtropical (Cfa).
Jackson has a humid subtropical climate (Cfa). January averages a high of 15°C and a low of 2°C with 135 mm of rain; July averages 34°C / 23°C and 110 mm.
Jackson averages about 6.9 hours of sunshine a day in January and 11.8 hours in July.
January PM2.5 averages about 5.9 µg/m³ (US AQI 36); July averages 15.3 µg/m³ (US AQI 65).
Other close climate matches for Jackson: Columbia (very close), Islamabad (loose), Asunción (loose).
All humid subtropical (Cfa) cities on Similar Climates →
Explore Jackson and Porto Alegre on the interactive map →