Climate averages 1991–2020
Mendoza weather
in December.
A warm, moderately wet month: the 2nd warmest and the joint 9th 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 Mendoza: daytime highs average 27.6°C and nights cool to about 16.3°C. By daytime temperature it is the 2nd warmest of the 12 months.
Expect about 48 mm of rain on roughly 7 days, which makes December a moderately wet month (the joint 9th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 14 h 16 min on an average December day.
The nearest other city in this atlas is San Martín (41 km away). In December its highs average 30.9°C, 3.3°C warmer than Mendoza, with 39 mm of rain.
Among the 67 cities listed in Argentina, Mendoza ranks joint 45th of 67 for the warmest December highs and joint 10th of 67 for the driest December (rainfall, lowest first). The mean December high of those 67 cities is 27.9°C; Mendoza is 0.3°C cooler than that mean.
From December to January, average highs rise by 0.8°C to 28.4°C, and monthly rainfall stays at 48 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
Mendoza climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 28.4°C17.8°C | 17.8°C | 48 | 7.8 | 14.014 h |
| February | 26.9°C16.6°C | 16.6°C | 48 | 7.2 | 13.313 h |
| March | 23.9°C14.4°C | 14.4°C | 59 | 7.8 | 12.312 h |
| April | 19.4°C10.2°C | 10.2°C | 40 | 6.5 | 11.311 h |
| May | 15.5°C6.4°C | 6.4°C | 30 | 6.1 | 10.510 h |
| June | 13.0°C2.7°C | 2.7°C | 21 | 4.1 | 10.010 h |
| July | 12.3°C1.5°C | 1.5°C | 19 | 3.6 | 10.210 h |
| August | 15.1°C3.2°C | 3.2°C | 25 | 4.1 | 10.911 h |
| September | 18.3°C6.1°C | 6.1°C | 28 | 5.0 | 11.912 h |
| October | 21.9°C9.9°C | 9.9°C | 43 | 6.4 | 12.913 h |
| November | 25.0°C13.3°C | 13.3°C | 44 | 7.4 | 13.814 h |
| December, selected | 27.6°C16.3°C | 16.3°C | 48 | 6.8 | 14.314 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
- San Martín in DecemberArgentina · 41 kmHigh 30.9°C · Low 18.8°C · 39 mm rain
- Rawson in DecemberArgentina · 148 kmHigh 29.8°C · Low 16.9°C · 22 mm rain
- San Juan, Argentina in DecemberArgentina · 153 kmHigh 30.3°C · Low 17.7°C · 22 mm rain
- Peñalolén in DecemberChile · 170 kmHigh 24.9°C · Low 13.6°C · 25 mm rain
- Colina in DecemberChile · 174 kmHigh 27.9°C · Low 16.3°C · 13 mm rain
- Santiago in DecemberChile · 179 kmHigh 26.2°C · Low 14.1°C · 6.3 mm rain
- Puente Alto in DecemberChile · 180 kmHigh 25.9°C · Low 13.2°C · 25 mm rain
- Quilicura in DecemberChile · 182 kmHigh 26.7°C · Low 14.8°C · 13 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 Mendoza) is explained once on the Mendoza year overview and on the Sources, method and limits page.