Climate averages 1991–2020
Castanhal weather
in December.
A hot, wet month: the 4th warmest and the 6th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
December is a hot month in Castanhal: daytime highs average 31.8°C and nights cool to about 24.0°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 118 mm of rain on roughly 17 days, which makes December a wet month (the 6th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 12 min on an average December day.
The nearest other city in this atlas is Santa Isabel do Pará (26 km away). In December its highs average 31.3°C, 0.5°C cooler than Castanhal, with 143 mm of rain.
Among the 448 cities listed in Brazil, Castanhal ranks 33rd of 448 for the warmest December highs and 104th of 448 for the driest December (rainfall, lowest first). The mean December high of those 448 cities is 28.5°C; Castanhal is 3.3°C warmer than that mean.
From December to January, average highs fall by 2.0°C to 29.8°C, and monthly rainfall rises from 118 mm to 269 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
Castanhal climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 29.8°C23.3°C | 23.3°C | 269 | 27.0 | 12.212 h |
| February | 29.0°C23.0°C | 23.0°C | 357 | 27.2 | 12.212 h |
| March | 28.9°C22.9°C | 22.9°C | 456 | 30.5 | 12.112 h |
| April | 28.9°C23.0°C | 23.0°C | 427 | 29.6 | 12.112 h |
| May | 29.4°C23.0°C | 23.0°C | 278 | 27.7 | 12.112 h |
| June | 29.7°C22.7°C | 22.7°C | 120 | 21.4 | 12.012 h |
| July | 30.0°C22.6°C | 22.6°C | 91 | 18.1 | 12.112 h |
| August | 31.2°C23.0°C | 23.0°C | 51 | 12.7 | 12.112 h |
| September | 32.3°C23.4°C | 23.4°C | 34 | 8.6 | 12.112 h |
| October | 33.1°C23.7°C | 23.7°C | 34 | 8.0 | 12.112 h |
| November | 32.9°C24.0°C | 24.0°C | 49 | 8.7 | 12.212 h |
| December, selected | 31.8°C24.0°C | 24.0°C | 118 | 17.2 | 12.212 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
- Santa Isabel do Pará in DecemberBrazil · 26 kmHigh 31.3°C · Low 24.2°C · 143 mm rain
- Marituba in DecemberBrazil · 47 kmHigh 31.5°C · Low 24.4°C · 143 mm rain
- Ananindeua in DecemberBrazil · 50 kmHigh 31.1°C · Low 24.5°C · 143 mm rain
- Belém in DecemberBrazil · 67 kmHigh 30.7°C · Low 24.9°C · 108 mm rain
- Barcarena in DecemberBrazil · 81 kmHigh 30.6°C · Low 25.0°C · 103 mm rain
- Capanema in DecemberBrazil · 84 kmHigh 31.6°C · Low 24.2°C · 82 mm rain
- Moju in DecemberBrazil · 114 kmHigh 31.9°C · Low 24.1°C · 140 mm rain
- Abaetetuba in DecemberBrazil · 116 kmHigh 31.1°C · Low 24.8°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 Castanhal) is explained once on the Castanhal year overview and on the Sources, method and limits page.