Climate averages 1991–2020
Três Rios weather
in December.
A hot, very wet month: the joint 3rd warmest and the wettest of the year.
Long-term climate patterns, not a forecast for a particular trip.
December is a hot month in Três Rios: daytime highs average 28.9°C and nights cool to about 20.9°C. By daytime temperature it is the joint 3rd warmest of the 12 months.
Expect about 235 mm of rain on roughly 21 days, which makes December a very wet month (the wettest month of the year). Daylight, from sunrise to sunset, lasts about 13 h 27 min on an average December day.
The nearest other city in this atlas is Teresópolis (41 km away). In December its highs average 25.4°C, 3.6°C cooler than Três Rios, with 323 mm of rain.
Among the 448 cities listed in Brazil, Três Rios ranks joint 179th of 448 for the warmest December highs and joint 349th of 448 for the driest December (rainfall, lowest first). The mean December high of those 448 cities is 28.5°C; Três Rios is 0.5°C warmer than that mean.
From December to January, average highs rise by 0.7°C to 29.6°C, and monthly rainfall falls from 235 mm to 232 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
Três Rios climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 29.6°C21.5°C | 21.5°C | 232 | 19.3 | 13.313 h |
| February | 30.2°C21.5°C | 21.5°C | 156 | 15.0 | 12.813 h |
| March | 28.9°C21.0°C | 21.0°C | 148 | 17.6 | 12.212 h |
| April | 27.4°C19.5°C | 19.5°C | 57 | 9.6 | 11.612 h |
| May | 25.1°C16.7°C | 16.7°C | 35 | 6.3 | 11.111 h |
| June | 24.5°C15.4°C | 15.4°C | 17 | 3.4 | 10.811 h |
| July | 24.3°C14.9°C | 14.9°C | 18 | 3.7 | 10.911 h |
| August | 25.5°C15.3°C | 15.3°C | 21 | 4.3 | 11.411 h |
| September | 26.8°C17.0°C | 17.0°C | 59 | 8.6 | 12.012 h |
| October | 27.8°C18.8°C | 18.8°C | 107 | 13.5 | 12.613 h |
| November | 27.5°C19.7°C | 19.7°C | 198 | 18.8 | 13.213 h |
| December, selected | 28.9°C20.9°C | 20.9°C | 235 | 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
- Teresópolis in DecemberBrazil · 41 kmHigh 25.4°C · Low 18.5°C · 323 mm rain
- Juiz de Fora in DecemberBrazil · 42 kmHigh 26.8°C · Low 18.8°C · 340 mm rain
- Petrópolis in DecemberBrazil · 43 kmHigh 26.1°C · Low 18.9°C · 295 mm rain
- Valença (Rio de Janeiro), Brazil in DecemberBrazil · 53 kmHigh 27.4°C · Low 19.3°C · 297 mm rain
- Magé in DecemberBrazil · 62 kmHigh 29.1°C · Low 21.9°C · 229 mm rain
- Nova Friburgo in DecemberBrazil · 72 kmHigh 26.2°C · Low 19.1°C · 352 mm rain
- Japeri in DecemberBrazil · 74 kmHigh 30.3°C · Low 22.3°C · 226 mm rain
- Barra do Piraí in DecemberBrazil · 75 kmHigh 28.5°C · Low 20.5°C · 248 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 Três Rios) is explained once on the Três Rios year overview and on the Sources, method and limits page.