Climate averages 1991–2020
São João da Boa Vista weather
in December.
A warm, very wet month: the 5th 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 São João da Boa Vista: daytime highs average 27.5°C and nights cool to about 19.2°C. By daytime temperature it is the 5th warmest of the 12 months.
Expect about 245 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 27 min on an average December day.
The nearest other city in this atlas is Poços de Caldas (32 km away). In December its highs average 24.7°C, 2.7°C cooler than São João da Boa Vista, with 308 mm of rain.
Among the 448 cities listed in Brazil, São João da Boa Vista ranks joint 279th of 448 for the warmest December highs and joint 371st of 448 for the driest December (rainfall, lowest first). The mean December high of those 448 cities is 28.5°C; São João da Boa Vista is 1.0°C cooler than that mean.
From December to January, average highs rise by 0.1°C to 27.6°C, and monthly rainfall rises from 245 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
São João da Boa Vista climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 27.6°C19.5°C | 19.5°C | 282 | 24.0 | 13.313 h |
| February | 27.8°C19.4°C | 19.4°C | 213 | 20.3 | 12.813 h |
| March | 27.2°C18.6°C | 18.6°C | 183 | 19.9 | 12.212 h |
| April | 26.3°C16.7°C | 16.7°C | 80 | 10.3 | 11.612 h |
| May | 23.9°C13.7°C | 13.7°C | 56 | 6.4 | 11.111 h |
| June | 23.5°C12.5°C | 12.5°C | 32 | 4.1 | 10.811 h |
| July | 23.8°C12.2°C | 12.2°C | 27 | 3.3 | 10.911 h |
| August | 25.8°C13.5°C | 13.5°C | 26 | 3.7 | 11.411 h |
| September | 27.7°C16.2°C | 16.2°C | 77 | 8.7 | 12.012 h |
| October | 28.1°C18.0°C | 18.0°C | 122 | 14.5 | 12.613 h |
| November | 27.2°C18.4°C | 18.4°C | 191 | 19.4 | 13.113 h |
| December, selected | 27.5°C19.2°C | 19.2°C | 245 | 23.4 | 13.413 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
- Poços de Caldas in DecemberBrazil · 32 kmHigh 24.7°C · Low 17.4°C · 308 mm rain
- Mogi Guaçu in DecemberBrazil · 47 kmHigh 28.3°C · Low 19.6°C · 220 mm rain
- Itapira in DecemberBrazil · 52 kmHigh 28.1°C · Low 19.5°C · 210 mm rain
- Mogi Mirim in DecemberBrazil · 54 kmHigh 28.2°C · Low 19.5°C · 223 mm rain
- Pirassununga in DecemberBrazil · 65 kmHigh 28.2°C · Low 19.7°C · 215 mm rain
- Leme in DecemberBrazil · 66 kmHigh 28.2°C · Low 19.7°C · 235 mm rain
- Araras in DecemberBrazil · 74 kmHigh 28.1°C · Low 19.6°C · 235 mm rain
- Cosmópolis in DecemberBrazil · 86 kmHigh 28.4°C · Low 19.7°C · 211 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 São João da Boa Vista) is explained once on the São João da Boa Vista year overview and on the Sources, method and limits page.