Climate averages 1991–2020
Grajaú weather
in December.
A hot, 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 Grajaú: daytime highs average 30.7°C and nights cool to about 23.2°C. By daytime temperature it is the 7th warmest of the 12 months.
Expect about 135 mm of rain on roughly 18 days, which makes December a wet month (the 9th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 27 min on an average December day.
The nearest other city in this atlas is Barra do Corda (105 km away). In December its highs average 31.2°C, about as warm as Grajaú, with 135 mm of rain.
Among the 448 cities listed in Brazil, Grajaú ranks joint 62nd of 448 for the warmest December highs and joint 122nd of 448 for the driest December (rainfall, lowest first). The mean December high of those 448 cities is 28.5°C; Grajaú is 2.3°C warmer than that mean.
From December to January, average highs fall by 1.4°C to 29.3°C, and monthly rainfall rises from 135 mm to 172 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
Grajaú climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 29.3°C22.6°C | 22.6°C | 172 | 24.7 | 12.412 h |
| February | 29.2°C22.6°C | 22.6°C | 177 | 24.0 | 12.312 h |
| March | 29.2°C22.6°C | 22.6°C | 188 | 26.1 | 12.112 h |
| April | 29.5°C22.6°C | 22.6°C | 132 | 20.4 | 12.012 h |
| May | 30.1°C22.3°C | 22.3°C | 64 | 10.5 | 11.912 h |
| June | 31.5°C22.1°C | 22.1°C | 8.4 | 1.6 | 11.812 h |
| July | 32.5°C22.2°C | 22.2°C | 4.7 | 0.8 | 11.812 h |
| August | 33.7°C22.6°C | 22.6°C | 1.9 | 0.3 | 11.912 h |
| September | 34.4°C23.5°C | 23.5°C | 8.9 | 1.7 | 12.112 h |
| October | 33.8°C24.1°C | 24.1°C | 32 | 5.3 | 12.212 h |
| November | 32.1°C23.7°C | 23.7°C | 78 | 11.9 | 12.412 h |
| December, selected | 30.7°C23.2°C | 23.2°C | 135 | 17.8 | 12.512 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
- Barra do Corda in DecemberBrazil · 105 kmHigh 31.2°C · Low 23.5°C · 135 mm rain
- Imperatriz in DecemberBrazil · 153 kmHigh 30.3°C · Low 23.7°C · 144 mm rain
- Açailândia in DecemberBrazil · 180 kmHigh 30.0°C · Low 22.6°C · 165 mm rain
- Balsas in DecemberBrazil · 191 kmHigh 30.4°C · Low 22.6°C · 157 mm rain
- Bacabal in DecemberBrazil · 232 kmHigh 32.6°C · Low 24.5°C · 131 mm rain
- Santa Inês in DecemberBrazil · 254 kmHigh 32.3°C · Low 24.5°C · 120 mm rain
- Araguaína in DecemberBrazil · 275 kmHigh 29.6°C · Low 22.4°C · 229 mm rain
- Codó in DecemberBrazil · 292 kmHigh 32.9°C · Low 24.3°C · 112 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 Grajaú) is explained once on the Grajaú year overview and on the Sources, method and limits page.