Climate averages 1991–2020
Copiapó weather
in December.
A hot, very dry month: the 3rd warmest and the 5th driest of the year. Meets the pleasant-weather rule
Long-term climate patterns, not a forecast for a particular trip.
December is a hot month in Copiapó: daytime highs average 28.6°C and nights cool to about 17.0°C. By daytime temperature it is the 3rd warmest of the 12 months.
Rain is very rare: less than 1 mm falls in a typical December (the 5th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 50 min on an average December day.
The nearest other city in this atlas is La Serena (296 km away). In December its highs average 24.6°C, 4.0°C cooler than Copiapó, with almost no rain (under 1 mm).
Among the 40 cities listed in Chile, Copiapó ranks 2nd of 40 for the warmest December highs and joint 2nd of 40 for the driest December (rainfall, lowest first). The mean December high of those 40 cities is 23.8°C; Copiapó is 4.8°C warmer than that mean.
From December to January, average highs rise by 0.8°C to 29.4°C, and monthly rainfall stays under 1 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
Copiapó climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 29.4°C18.2°C | 18.2°C | 0.2 | 0.0 | 13.714 h |
| February | 29.4°C18.4°C | 18.4°C | 0.3 | 0.1 | 13.013 h |
| March | 28.5°C18.1°C | 18.1°C | 4.5 | 0.3 | 12.312 h |
| April | 26.6°C16.5°C | 16.5°C | 2.1 | 0.3 | 11.511 h |
| May | 24.7°C13.3°C | 13.3°C | 7.7 | 1.0 | 10.811 h |
| June | 23.4°C10.4°C | 10.4°C | 6.2 | 0.8 | 10.410 h |
| July | 23.0°C9.1°C | 9.1°C | 5.8 | 1.1 | 10.611 h |
| August | 24.2°C11.2°C | 11.2°C | 3.0 | 0.6 | 11.211 h |
| September | 25.2°C13.3°C | 13.3°C | 1.8 | 0.4 | 11.912 h |
| October | 26.6°C15.1°C | 15.1°C | 0.4 | 0.2 | 12.713 h |
| November | 27.7°C16.1°C | 16.1°C | 0.1 | 0.1 | 13.413 h |
| December, selected | 28.6°C17.0°C | 17.0°C | 0.5 | 0.1 | 13.814 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
- La Serena in DecemberChile · 296 kmHigh 24.6°C · Low 16.6°C · 0.5 mm rain
- Coquimbo in DecemberChile · 304 kmHigh 23.1°C · Low 15.8°C · 0.5 mm rain
- Ovalle in DecemberChile · 369 kmHigh 28.7°C · Low 15.6°C · 0.3 mm rain
- Antofagasta in DecemberChile · 413 kmHigh 21.4°C · Low 14.8°C · 1.9 mm rain
- Catamarca in DecemberArgentina · 463 kmHigh 29.3°C · Low 20.3°C · 129 mm rain
- San Juan, Argentina in DecemberArgentina · 496 kmHigh 30.3°C · Low 17.7°C · 22 mm rain
- Rawson in DecemberArgentina · 500 kmHigh 29.8°C · Low 16.9°C · 22 mm rain
- Calama in DecemberChile · 564 kmHigh 25.2°C · Low 7.5°C · 1.3 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 Copiapó) is explained once on the Copiapó year overview and on the Sources, method and limits page.