Climate averages 1991–2020
Ji Paraná weather
in December.
A hot, very wet month: the 7th warmest and the 10th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
December is a hot month in Ji Paraná: daytime highs average 29.5°C and nights cool to about 23.0°C. By daytime temperature it is the 7th warmest of the 12 months.
Expect about 248 mm of rain on roughly 27 days, which makes December a very wet month (the 10th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 45 min on an average December day.
The nearest other city in this atlas is Cacoal (83 km away). In December its highs average 29.4°C, about as warm as Ji Paraná, with 284 mm of rain.
Among the 448 cities listed in Brazil, Ji Paraná ranks joint 137th 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; Ji Paraná is 1.1°C warmer than that mean.
From December to January, average highs fall by 0.4°C to 29.1°C, and monthly rainfall rises from 248 mm to 270 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
Ji Paraná climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 29.1°C22.8°C | 22.8°C | 270 | 28.5 | 12.713 h |
| February | 28.9°C22.8°C | 22.8°C | 263 | 26.4 | 12.512 h |
| March | 29.2°C22.8°C | 22.8°C | 241 | 27.8 | 12.212 h |
| April | 29.2°C22.6°C | 22.6°C | 148 | 22.2 | 11.912 h |
| May | 29.2°C21.8°C | 21.8°C | 78 | 14.3 | 11.612 h |
| June | 30.5°C20.9°C | 20.9°C | 18 | 3.7 | 11.511 h |
| July | 32.2°C20.8°C | 20.8°C | 11 | 2.0 | 11.512 h |
| August | 33.6°C21.9°C | 21.9°C | 23 | 4.5 | 11.812 h |
| September | 33.3°C23.2°C | 23.2°C | 80 | 13.4 | 12.012 h |
| October | 32.1°C23.3°C | 23.3°C | 143 | 19.8 | 12.312 h |
| November | 30.4°C23.1°C | 23.1°C | 212 | 24.3 | 12.613 h |
| December, selected | 29.5°C23.0°C | 23.0°C | 248 | 26.7 | 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
- Cacoal in DecemberBrazil · 83 kmHigh 29.4°C · Low 22.8°C · 284 mm rain
- Ariquemes in DecemberBrazil · 161 kmHigh 29.8°C · Low 22.9°C · 246 mm rain
- Vilhena in DecemberBrazil · 285 kmHigh 27.7°C · Low 21.1°C · 259 mm rain
- Porto Velho in DecemberBrazil · 319 kmHigh 29.7°C · Low 23.5°C · 298 mm rain
- Riberalta in DecemberBolivia · 448 kmHigh 29.8°C · Low 23.5°C · 262 mm rain
- Trinidad in DecemberBolivia · 543 kmHigh 29.5°C · Low 23.6°C · 298 mm rain
- Tangará da Serra in DecemberBrazil · 638 kmHigh 29.6°C · Low 22.4°C · 209 mm rain
- Rio Branco in DecemberBrazil · 649 kmHigh 29.5°C · Low 23.0°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 Ji Paraná) is explained once on the Ji Paraná year overview and on the Sources, method and limits page.