Climate averages 1991–2020
Vilhena weather
in December.
A warm, 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 warm month in Vilhena: daytime highs average 27.7°C and nights cool to about 21.1°C. By daytime temperature it is the 7th warmest of the 12 months.
Expect about 259 mm of rain on roughly 28 days, which makes December a very wet month (the 10th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 51 min on an average December day.
The nearest other city in this atlas is Cacoal (202 km away). In December its highs average 29.4°C, 1.7°C warmer than Vilhena, with 284 mm of rain.
Among the 448 cities listed in Brazil, Vilhena ranks joint 270th of 448 for the warmest December highs and 404th of 448 for the driest December (rainfall, lowest first). The mean December high of those 448 cities is 28.5°C; Vilhena is 0.8°C cooler than that mean.
From December to January, average highs fall by 0.2°C to 27.5°C, and monthly rainfall rises from 259 mm to 267 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
Vilhena climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 27.5°C21.0°C | 21.0°C | 267 | 29.4 | 12.813 h |
| February | 27.2°C20.8°C | 20.8°C | 276 | 27.2 | 12.513 h |
| March | 27.5°C20.9°C | 20.9°C | 241 | 28.6 | 12.212 h |
| April | 27.6°C20.4°C | 20.4°C | 128 | 21.4 | 11.812 h |
| May | 27.5°C19.4°C | 19.4°C | 57 | 12.1 | 11.512 h |
| June | 28.3°C18.5°C | 18.5°C | 14 | 3.0 | 11.411 h |
| July | 29.3°C18.2°C | 18.2°C | 10 | 2.1 | 11.411 h |
| August | 31.0°C19.6°C | 19.6°C | 24 | 4.8 | 11.712 h |
| September | 30.8°C20.9°C | 20.9°C | 84 | 13.5 | 12.012 h |
| October | 29.5°C21.2°C | 21.2°C | 165 | 22.4 | 12.412 h |
| November | 28.2°C21.1°C | 21.1°C | 207 | 25.5 | 12.713 h |
| December, selected | 27.7°C21.1°C | 21.1°C | 259 | 28.2 | 12.913 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 · 202 kmHigh 29.4°C · Low 22.8°C · 284 mm rain
- Ji Paraná in DecemberBrazil · 285 kmHigh 29.5°C · Low 23.0°C · 248 mm rain
- Tangará da Serra in DecemberBrazil · 355 kmHigh 29.6°C · Low 22.4°C · 209 mm rain
- Ariquemes in DecemberBrazil · 445 kmHigh 29.8°C · Low 22.9°C · 246 mm rain
- Cáceres, Brazil in DecemberBrazil · 456 kmHigh 31.5°C · Low 24.3°C · 165 mm rain
- Lucas do Rio Verde in DecemberBrazil · 460 kmHigh 29.0°C · Low 22.2°C · 232 mm rain
- Sorriso in DecemberBrazil · 482 kmHigh 28.9°C · Low 22.1°C · 230 mm rain
- Sinop in DecemberBrazil · 514 kmHigh 28.6°C · Low 21.8°C · 296 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 Vilhena) is explained once on the Vilhena year overview and on the Sources, method and limits page.