Climate averages 1991–2020
Valença (Rio de Janeiro), Brazil 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 Valença (Rio de Janeiro), Brazil: daytime highs average 27.4°C and nights cool to about 19.3°C. By daytime temperature it is the 3rd warmest of the 12 months.
Expect about 297 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 28 min on an average December day.
The nearest other city in this atlas is Barra do Piraí (28 km away). In December its highs average 28.5°C, 1.1°C warmer than Valença (Rio de Janeiro), Brazil, with 248 mm of rain.
Among the 448 cities listed in Brazil, Valença (Rio de Janeiro), Brazil ranks joint 287th of 448 for the warmest December highs and joint 434th of 448 for the driest December (rainfall, lowest first). The mean December high of those 448 cities is 28.5°C; Valença (Rio de Janeiro), Brazil is 1.0°C cooler than that mean.
From December to January, average highs rise by 0.8°C to 28.2°C, and monthly rainfall rises from 297 mm to 302 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
Valença (Rio de Janeiro), Brazil climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 28.2°C20.0°C | 20.0°C | 302 | 22.3 | 13.313 h |
| February | 28.7°C20.0°C | 20.0°C | 221 | 17.9 | 12.813 h |
| March | 27.3°C19.4°C | 19.4°C | 220 | 20.9 | 12.212 h |
| April | 25.8°C17.8°C | 17.8°C | 95 | 13.1 | 11.612 h |
| May | 23.5°C15.1°C | 15.1°C | 54 | 9.1 | 11.111 h |
| June | 23.2°C13.5°C | 13.5°C | 26 | 5.3 | 10.811 h |
| July | 22.9°C13.0°C | 13.0°C | 26 | 5.3 | 10.911 h |
| August | 24.1°C13.7°C | 13.7°C | 30 | 6.3 | 11.411 h |
| September | 25.4°C15.6°C | 15.6°C | 76 | 10.8 | 11.912 h |
| October | 26.3°C17.2°C | 17.2°C | 137 | 15.6 | 12.613 h |
| November | 26.0°C18.1°C | 18.1°C | 244 | 20.2 | 13.213 h |
| December, selected | 27.4°C19.3°C | 19.3°C | 297 | 23.1 | 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
- Barra do Piraí in DecemberBrazil · 28 kmHigh 28.5°C · Low 20.5°C · 248 mm rain
- Japeri in DecemberBrazil · 44 kmHigh 30.3°C · Low 22.3°C · 226 mm rain
- Volta Redonda in DecemberBrazil · 52 kmHigh 28.1°C · Low 19.8°C · 240 mm rain
- Três Rios in DecemberBrazil · 53 kmHigh 28.9°C · Low 20.9°C · 235 mm rain
- Queimados in DecemberBrazil · 54 kmHigh 29.8°C · Low 21.8°C · 192 mm rain
- Seropédica in DecemberBrazil · 55 kmHigh 29.6°C · Low 21.8°C · 226 mm rain
- Barra Mansa in DecemberBrazil · 59 kmHigh 27.9°C · Low 19.7°C · 248 mm rain
- Petrópolis in DecemberBrazil · 61 kmHigh 26.1°C · Low 18.9°C · 295 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 Valença) is explained once on the Valença (Rio de Janeiro), Brazil year overview and on the Sources, method and limits page.