Climate averages 1991–2020
Petrópolis weather
in December.
A warm, very wet month: the 3rd warmest and the 11th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
December is a warm month in Petrópolis: daytime highs average 26.1°C and nights cool to about 18.9°C. By daytime temperature it is the 3rd warmest of the 12 months.
Expect about 295 mm of rain on roughly 23 days, which makes December a very wet month (the 11th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 29 min on an average December day.
The nearest other city in this atlas is Magé (22 km away). In December its highs average 29.1°C, 3.0°C warmer than Petrópolis, with 229 mm of rain.
Among the 448 cities listed in Brazil, Petrópolis ranks joint 384th of 448 for the warmest December highs and joint 431st of 448 for the driest December (rainfall, lowest first). The mean December high of those 448 cities is 28.5°C; Petrópolis is 2.4°C cooler than that mean.
From December to January, average highs rise by 0.8°C to 26.9°C, and monthly rainfall rises from 295 mm to 315 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
Petrópolis climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 26.9°C19.6°C | 19.6°C | 315 | 22.9 | 13.313 h |
| February | 27.3°C19.6°C | 19.6°C | 233 | 18.5 | 12.913 h |
| March | 25.9°C19.0°C | 19.0°C | 244 | 22.0 | 12.212 h |
| April | 24.3°C17.4°C | 17.4°C | 105 | 14.0 | 11.612 h |
| May | 22.0°C14.8°C | 14.8°C | 70 | 10.9 | 11.111 h |
| June | 21.6°C13.6°C | 13.6°C | 41 | 7.0 | 10.811 h |
| July | 21.4°C13.0°C | 13.0°C | 39 | 6.6 | 10.911 h |
| August | 22.5°C13.5°C | 13.5°C | 42 | 7.2 | 11.311 h |
| September | 23.8°C15.1°C | 15.1°C | 88 | 10.8 | 11.912 h |
| October | 24.8°C16.7°C | 16.7°C | 137 | 15.1 | 12.613 h |
| November | 24.6°C17.5°C | 17.5°C | 252 | 20.0 | 13.213 h |
| December, selected | 26.1°C18.9°C | 18.9°C | 295 | 23.2 | 13.513 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
- Magé in DecemberBrazil · 22 kmHigh 29.1°C · Low 21.9°C · 229 mm rain
- Teresópolis in DecemberBrazil · 23 kmHigh 25.4°C · Low 18.5°C · 323 mm rain
- Duque de Caxias in DecemberBrazil · 34 kmHigh 29.8°C · Low 22.3°C · 237 mm rain
- Belford Roxo in DecemberBrazil · 37 kmHigh 30.0°C · Low 22.5°C · 192 mm rain
- São Gonçalo in DecemberBrazil · 38 kmHigh 29.1°C · Low 22.1°C · 229 mm rain
- Nova Iguaçu in DecemberBrazil · 40 kmHigh 30.0°C · Low 22.3°C · 192 mm rain
- Itaboraí in DecemberBrazil · 42 kmHigh 28.7°C · Low 21.6°C · 255 mm rain
- Três Rios in DecemberBrazil · 43 kmHigh 28.9°C · Low 20.9°C · 235 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 Petrópolis) is explained once on the Petrópolis year overview and on the Sources, method and limits page.