Climate averages 1991–2020
Altamira weather
in December.
A hot, wet month: the 5th warmest and the 7th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
December is a hot month in Altamira: daytime highs average 30.4°C and nights cool to about 23.8°C. By daytime temperature it is the 5th warmest of the 12 months.
Expect about 152 mm of rain on roughly 22 days, which makes December a wet month (the 7th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 18 min on an average December day.
The nearest other city in this atlas is Breves (256 km away). In December its highs average 31.6°C, 1.3°C warmer than Altamira, with 125 mm of rain.
Among the 448 cities listed in Brazil, Altamira ranks joint 71st of 448 for the warmest December highs and joint 145th of 448 for the driest December (rainfall, lowest first). The mean December high of those 448 cities is 28.5°C; Altamira is 1.9°C warmer than that mean.
From December to January, average highs fall by 1.5°C to 28.9°C, and monthly rainfall rises from 152 mm to 248 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
Altamira climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 28.9°C23.0°C | 23.0°C | 248 | 28.1 | 12.312 h |
| February | 28.5°C22.9°C | 22.9°C | 276 | 26.8 | 12.212 h |
| March | 28.5°C22.9°C | 22.9°C | 328 | 29.1 | 12.112 h |
| April | 28.5°C23.0°C | 23.0°C | 280 | 28.2 | 12.012 h |
| May | 28.8°C23.1°C | 23.1°C | 190 | 26.1 | 12.012 h |
| June | 29.2°C22.9°C | 22.9°C | 71 | 16.5 | 11.912 h |
| July | 30.0°C22.8°C | 22.8°C | 46 | 10.1 | 12.012 h |
| August | 32.1°C23.5°C | 23.5°C | 31 | 7.1 | 12.012 h |
| September | 33.1°C24.2°C | 24.2°C | 34 | 7.0 | 12.112 h |
| October | 33.0°C24.5°C | 24.5°C | 60 | 11.1 | 12.212 h |
| November | 31.9°C24.3°C | 24.3°C | 100 | 14.9 | 12.312 h |
| December, selected | 30.4°C23.8°C | 23.8°C | 152 | 21.9 | 12.312 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
- Breves in DecemberBrazil · 256 kmHigh 31.6°C · Low 24.4°C · 125 mm rain
- Tucuruí in DecemberBrazil · 287 kmHigh 30.5°C · Low 24.6°C · 198 mm rain
- Santarém in DecemberBrazil · 290 kmHigh 29.9°C · Low 25.7°C · 233 mm rain
- Cametá in DecemberBrazil · 319 kmHigh 31.4°C · Low 24.6°C · 151 mm rain
- Tailândia in DecemberBrazil · 362 kmHigh 32.2°C · Low 23.8°C · 149 mm rain
- Santana in DecemberBrazil · 370 kmHigh 30.4°C · Low 24.3°C · 105 mm rain
- Macapá in DecemberBrazil · 382 kmHigh 30.1°C · Low 24.3°C · 128 mm rain
- São Félix do Xingu in DecemberBrazil · 383 kmHigh 29.2°C · Low 22.8°C · 246 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 Altamira) is explained once on the Altamira year overview and on the Sources, method and limits page.