Climate averages 1991–2020
Ariquemes weather
in December.
A hot, very wet month: the 7th warmest and the 9th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
December is a hot month in Ariquemes: daytime highs average 29.8°C and nights cool to about 22.9°C. By daytime temperature it is the 7th warmest of the 12 months.
Expect about 246 mm of rain on roughly 27 days, which makes December a very wet month (the 9th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 41 min on an average December day.
The nearest other city in this atlas is Porto Velho (159 km away). In December its highs average 29.7°C, about as warm as Ariquemes, with 298 mm of rain.
Among the 448 cities listed in Brazil, Ariquemes ranks joint 109th of 448 for the warmest December highs and joint 381st of 448 for the driest December (rainfall, lowest first). The mean December high of those 448 cities is 28.5°C; Ariquemes is 1.3°C warmer than that mean.
From December to January, average highs fall by 0.3°C to 29.5°C, and monthly rainfall rises from 246 mm to 281 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
Ariquemes climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 29.5°C22.8°C | 22.8°C | 281 | 27.6 | 12.613 h |
| February | 29.3°C22.7°C | 22.7°C | 282 | 26.3 | 12.412 h |
| March | 29.4°C22.8°C | 22.8°C | 274 | 28.1 | 12.212 h |
| April | 29.4°C22.7°C | 22.7°C | 185 | 23.8 | 11.912 h |
| May | 29.3°C22.2°C | 22.2°C | 91 | 15.7 | 11.712 h |
| June | 30.7°C21.5°C | 21.5°C | 20 | 4.4 | 11.612 h |
| July | 32.7°C21.5°C | 21.5°C | 13 | 2.5 | 11.612 h |
| August | 33.9°C22.4°C | 22.4°C | 32 | 5.3 | 11.812 h |
| September | 33.1°C23.3°C | 23.3°C | 86 | 13.9 | 12.012 h |
| October | 32.1°C23.3°C | 23.3°C | 142 | 20.1 | 12.312 h |
| November | 30.4°C23.1°C | 23.1°C | 208 | 23.2 | 12.613 h |
| December, selected | 29.8°C22.9°C | 22.9°C | 246 | 26.8 | 12.713 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
- Porto Velho in DecemberBrazil · 159 kmHigh 29.7°C · Low 23.5°C · 298 mm rain
- Ji Paraná in DecemberBrazil · 161 kmHigh 29.5°C · Low 23.0°C · 248 mm rain
- Cacoal in DecemberBrazil · 243 kmHigh 29.4°C · Low 22.8°C · 284 mm rain
- Riberalta in DecemberBolivia · 351 kmHigh 29.8°C · Low 23.5°C · 262 mm rain
- Vilhena in DecemberBrazil · 445 kmHigh 27.7°C · Low 21.1°C · 259 mm rain
- Rio Branco in DecemberBrazil · 522 kmHigh 29.5°C · Low 23.0°C · 246 mm rain
- Trinidad in DecemberBolivia · 583 kmHigh 29.5°C · Low 23.6°C · 298 mm rain
- Coari in DecemberBrazil · 648 kmHigh 29.3°C · Low 24.2°C · 256 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 Ariquemes) is explained once on the Ariquemes year overview and on the Sources, method and limits page.