Climate averages 1991–2020
Castro weather
in December.
A warm, wet month: the 3rd 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 Castro: daytime highs average 25.1°C and nights cool to about 16.9°C. By daytime temperature it is the 3rd warmest of the 12 months.
Expect about 172 mm of rain on roughly 20 days, which makes December a wet month (the 10th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 38 min on an average December day.
The nearest other city in this atlas is Ponta Grossa (37 km away). In December its highs average 25.1°C, about as warm as Castro, with 156 mm of rain.
Among the 448 cities listed in Brazil, Castro ranks joint 427th of 448 for the warmest December highs and joint 181st of 448 for the driest December (rainfall, lowest first). The mean December high of those 448 cities is 28.5°C; Castro is 3.4°C cooler than that mean.
From December to January, average highs rise by 0.1°C to 25.3°C, and monthly rainfall rises from 172 mm to 235 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
Castro climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 25.3°C17.8°C | 17.8°C | 235 | 23.7 | 13.513 h |
| February | 25.2°C17.8°C | 17.8°C | 180 | 21.1 | 12.913 h |
| March | 24.4°C16.9°C | 16.9°C | 133 | 18.0 | 12.212 h |
| April | 23.0°C14.9°C | 14.9°C | 69 | 9.6 | 11.512 h |
| May | 19.8°C11.9°C | 11.9°C | 89 | 8.9 | 10.911 h |
| June | 18.9°C10.8°C | 10.8°C | 93 | 8.1 | 10.611 h |
| July | 18.8°C10.1°C | 10.1°C | 79 | 7.0 | 10.811 h |
| August | 20.7°C10.8°C | 10.8°C | 72 | 7.2 | 11.311 h |
| September | 22.1°C12.5°C | 12.5°C | 127 | 10.4 | 11.912 h |
| October | 23.4°C14.4°C | 14.4°C | 138 | 15.1 | 12.713 h |
| November | 23.9°C15.2°C | 15.2°C | 133 | 16.0 | 13.313 h |
| December, selected | 25.1°C16.9°C | 16.9°C | 172 | 20.2 | 13.614 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
- Ponta Grossa in DecemberBrazil · 37 kmHigh 25.1°C · Low 16.5°C · 156 mm rain
- Telêmaco Borba in DecemberBrazil · 80 kmHigh 27.0°C · Low 18.0°C · 175 mm rain
- Campo Largo in DecemberBrazil · 89 kmHigh 24.4°C · Low 16.4°C · 175 mm rain
- Almirante Tamandaré in DecemberBrazil · 92 kmHigh 24.7°C · Low 16.8°C · 164 mm rain
- Colombo, Brazil in DecemberBrazil · 97 kmHigh 24.0°C · Low 16.3°C · 164 mm rain
- Curitiba in DecemberBrazil · 103 kmHigh 24.5°C · Low 16.8°C · 163 mm rain
- Araucária in DecemberBrazil · 108 kmHigh 24.6°C · Low 16.8°C · 175 mm rain
- Pinhais in DecemberBrazil · 110 kmHigh 24.4°C · Low 16.9°C · 163 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 Castro) is explained once on the Castro year overview and on the Sources, method and limits page.