Climate averages 1991–2020
Posadas weather
in December.
A hot, wet month: the 2nd warmest and the 11th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
December is a hot month in Posadas: daytime highs average 30.3°C and nights cool to about 21.5°C. By daytime temperature it is the 2nd warmest of the 12 months.
Expect about 163 mm of rain on roughly 12 days, which makes December a wet month (the 11th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 50 min on an average December day.
The nearest other city in this atlas is Encarnación (9 km away). In December its highs average 30.4°C, about as warm as Posadas, with 174 mm of rain.
Among the 67 cities listed in Argentina, Posadas ranks joint 9th of 67 for the warmest December highs and 65th of 67 for the driest December (rainfall, lowest first). The mean December high of those 67 cities is 27.9°C; Posadas is 2.4°C warmer than that mean.
From December to January, average highs rise by 0.7°C to 31.0°C, and monthly rainfall falls from 163 mm to 133 mm.
The annual picture
December in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Posadas climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 31.0°C22.7°C | 22.7°C | 133 | 12.6 | 13.714 h |
| February | 30.1°C22.2°C | 22.2°C | 130 | 11.9 | 13.013 h |
| March | 29.0°C20.9°C | 20.9°C | 121 | 10.5 | 12.312 h |
| April | 26.1°C18.1°C | 18.1°C | 159 | 9.9 | 11.511 h |
| May | 22.1°C14.8°C | 14.8°C | 143 | 9.1 | 10.811 h |
| June | 20.4°C13.3°C | 13.3°C | 121 | 8.9 | 10.410 h |
| July | 19.9°C12.0°C | 12.0°C | 117 | 9.1 | 10.611 h |
| August | 22.5°C13.4°C | 13.4°C | 90 | 7.9 | 11.111 h |
| September | 24.3°C15.0°C | 15.0°C | 147 | 9.8 | 11.912 h |
| October | 26.6°C17.8°C | 17.8°C | 216 | 12.4 | 12.713 h |
| November | 28.2°C19.1°C | 19.1°C | 156 | 10.4 | 13.413 h |
| December, selected | 30.3°C21.5°C | 21.5°C | 163 | 11.7 | 13.814 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
December in nearby cities
- Encarnación in DecemberParaguay · 9 kmHigh 30.4°C · Low 21.4°C · 174 mm rain
- Ituzaingó in DecemberArgentina · 78 kmHigh 30.6°C · Low 22.3°C · 166 mm rain
- Santa Rosa, Brazil in DecemberBrazil · 152 kmHigh 29.5°C · Low 20.1°C · 160 mm rain
- Santo Ângelo in DecemberBrazil · 192 kmHigh 29.2°C · Low 19.4°C · 178 mm rain
- Ijuí in DecemberBrazil · 226 kmHigh 28.8°C · Low 19.0°C · 178 mm rain
- Foz do Iguaçu in DecemberBrazil · 244 kmHigh 30.5°C · Low 22.4°C · 184 mm rain
- Ciudad del Este in DecemberParaguay · 245 kmHigh 30.5°C · Low 22.4°C · 189 mm rain
- Formosa, Argentina in DecemberArgentina · 260 kmHigh 31.3°C · Low 22.4°C · 162 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Posadas) is explained once on the Posadas year overview and on the Sources, method and limits page.