Climate averages 1991–2020
Barra Mansa 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 Barra Mansa: daytime highs average 27.9°C and nights cool to about 19.7°C. By daytime temperature it is the 3rd warmest of the 12 months.
Expect about 248 mm of rain on roughly 21 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 Volta Redonda (7 km away). In December its highs average 28.1°C, about as warm as Barra Mansa, with 240 mm of rain.
Among the 448 cities listed in Brazil, Barra Mansa ranks joint 256th of 448 for the warmest December highs and joint 386th of 448 for the driest December (rainfall, lowest first). The mean December high of those 448 cities is 28.5°C; Barra Mansa is 0.5°C cooler than that mean.
From December to January, average highs rise by 0.7°C to 28.6°C, and monthly rainfall rises from 248 mm to 282 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
Barra Mansa climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 28.6°C20.2°C | 20.2°C | 282 | 22.0 | 13.313 h |
| February | 29.1°C20.1°C | 20.1°C | 207 | 17.5 | 12.913 h |
| March | 27.7°C19.6°C | 19.6°C | 194 | 20.3 | 12.212 h |
| April | 26.2°C18.1°C | 18.1°C | 86 | 11.7 | 11.612 h |
| May | 24.1°C15.5°C | 15.5°C | 47 | 8.5 | 11.011 h |
| June | 23.7°C13.9°C | 13.9°C | 27 | 5.4 | 10.811 h |
| July | 23.5°C13.3°C | 13.3°C | 28 | 5.4 | 10.911 h |
| August | 24.9°C14.0°C | 14.0°C | 27 | 5.3 | 11.311 h |
| September | 26.2°C15.9°C | 15.9°C | 69 | 10.8 | 11.912 h |
| October | 27.0°C17.6°C | 17.6°C | 117 | 14.6 | 12.613 h |
| November | 26.6°C18.4°C | 18.4°C | 204 | 18.8 | 13.213 h |
| December, selected | 27.9°C19.7°C | 19.7°C | 248 | 21.3 | 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
- Volta Redonda in DecemberBrazil · 7 kmHigh 28.1°C · Low 19.8°C · 240 mm rain
- Resende in DecemberBrazil · 29 kmHigh 27.2°C · Low 19.2°C · 379 mm rain
- Barra do Piraí in DecemberBrazil · 36 kmHigh 28.5°C · Low 20.5°C · 248 mm rain
- Seropédica in DecemberBrazil · 53 kmHigh 29.6°C · Low 21.8°C · 226 mm rain
- Itaguaí in DecemberBrazil · 53 kmHigh 29.2°C · Low 22.6°C · 226 mm rain
- Angra dos Reis in DecemberBrazil · 54 kmHigh 28.0°C · Low 23.0°C · 244 mm rain
- Japeri in DecemberBrazil · 54 kmHigh 30.3°C · Low 22.3°C · 226 mm rain
- Valença (Rio de Janeiro), Brazil in DecemberBrazil · 59 kmHigh 27.4°C · Low 19.3°C · 297 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 Barra Mansa) is explained once on the Barra Mansa year overview and on the Sources, method and limits page.