Climate averages 1991–2020
Trelew weather
in December.
A warm, fairly dry month: the 3rd warmest and the joint 5th driest of the year. Meets the pleasant-weather rule
Long-term climate patterns, not a forecast for a particular trip.
December is a warm month in Trelew: daytime highs average 27.3°C and nights cool to about 14.5°C. By daytime temperature it is the 3rd warmest of the 12 months.
Expect about 18 mm of rain on roughly 3 days, which makes December a fairly dry month (the joint 5th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 15 h 19 min on an average December day.
The nearest other city in this atlas is Comodoro Rivadavia (338 km away). In December its highs average 21.5°C, 5.8°C cooler than Trelew, with 13 mm of rain.
Among the 67 cities listed in Argentina, Trelew ranks 51st of 67 for the warmest December highs and 5th of 67 for the driest December (rainfall, lowest first). The mean December high of those 67 cities is 27.9°C; Trelew is 0.5°C cooler than that mean.
From December to January, average highs rise by 1.7°C to 29.1°C, and monthly rainfall falls from 18 mm to 15 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
Trelew climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 29.1°C16.2°C | 16.2°C | 15 | 3.0 | 15.015 h |
| February | 27.5°C15.2°C | 15.2°C | 22 | 3.7 | 13.814 h |
| March | 25.1°C13.5°C | 13.5°C | 21 | 3.5 | 12.412 h |
| April | 20.4°C9.8°C | 9.8°C | 19 | 2.9 | 10.911 h |
| May | 15.8°C6.5°C | 6.5°C | 23 | 4.0 | 9.710 h |
| June | 12.1°C3.4°C | 3.4°C | 23 | 4.1 | 9.09 h |
| July | 11.8°C2.5°C | 2.5°C | 14 | 3.5 | 9.39 h |
| August | 14.5°C4.3°C | 4.3°C | 14 | 3.4 | 10.410 h |
| September | 17.3°C6.1°C | 6.1°C | 18 | 4.0 | 11.812 h |
| October | 21.3°C9.2°C | 9.2°C | 18 | 4.1 | 13.213 h |
| November | 24.7°C12.2°C | 12.2°C | 16 | 3.2 | 14.615 h |
| December, selected | 27.3°C14.5°C | 14.5°C | 18 | 3.0 | 15.315 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
- Comodoro Rivadavia in DecemberArgentina · 338 kmHigh 21.5°C · Low 12.9°C · 13 mm rain
- General Roca in DecemberArgentina · 506 kmHigh 30.2°C · Low 17.0°C · 16 mm rain
- Cipolletti in DecemberArgentina · 530 kmHigh 30.1°C · Low 16.7°C · 14 mm rain
- Neuquén in DecemberArgentina · 531 kmHigh 30.0°C · Low 16.5°C · 14 mm rain
- San Carlos de Bariloche in DecemberArgentina · 547 kmHigh 17.2°C · Low 7.1°C · 47 mm rain
- Bahía Blanca in DecemberArgentina · 565 kmHigh 28.0°C · Low 16.9°C · 57 mm rain
- Puerto Montt in DecemberChile · 658 kmHigh 17.2°C · Low 10.3°C · 137 mm rain
- Osorno in DecemberChile · 712 kmHigh 19.2°C · Low 9.6°C · 67 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 Trelew) is explained once on the Trelew year overview and on the Sources, method and limits page.