Climate averages 1991–2020
Santa Rosa, Argentina weather
in December.
A hot, moderately wet month: the 2nd warmest and the 11th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
December is a hot month in Santa Rosa, Argentina: daytime highs average 28.9°C and nights cool to about 17.5°C. By daytime temperature it is the 2nd warmest of the 12 months.
Expect about 85 mm of rain on roughly 9 days, which makes December a moderately wet month (the 11th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 14 h 36 min on an average December day.
The nearest other city in this atlas is Bahía Blanca (294 km away). In December its highs average 28.0°C, 0.9°C cooler than Santa Rosa, Argentina, with 57 mm of rain.
Among the 67 cities listed in Argentina, Santa Rosa, Argentina ranks joint 23rd of 67 for the warmest December highs and joint 24th of 67 for the driest December (rainfall, lowest first). The mean December high of those 67 cities is 27.9°C; Santa Rosa, Argentina is 1.0°C warmer than that mean.
From December to January, average highs rise by 1.2°C to 30.1°C, and monthly rainfall falls from 85 mm to 82 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
Santa Rosa, Argentina climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 30.1°C19.0°C | 19.0°C | 82 | 9.0 | 14.314 h |
| February | 28.3°C17.7°C | 17.7°C | 81 | 7.9 | 13.513 h |
| March | 25.6°C15.8°C | 15.8°C | 86 | 8.0 | 12.312 h |
| April | 21.0°C11.8°C | 11.8°C | 67 | 6.3 | 11.211 h |
| May | 17.0°C8.6°C | 8.6°C | 30 | 5.0 | 10.210 h |
| June | 13.9°C5.1°C | 5.1°C | 16 | 3.3 | 9.710 h |
| July | 13.3°C4.1°C | 4.1°C | 19 | 3.7 | 9.910 h |
| August | 16.2°C5.7°C | 5.7°C | 27 | 4.0 | 10.711 h |
| September | 18.9°C8.0°C | 8.0°C | 48 | 5.8 | 11.812 h |
| October | 21.9°C11.2°C | 11.2°C | 82 | 9.6 | 13.013 h |
| November | 25.7°C14.5°C | 14.5°C | 74 | 8.0 | 14.014 h |
| December, selected | 28.9°C17.5°C | 17.5°C | 85 | 8.5 | 14.615 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
- Bahía Blanca in DecemberArgentina · 294 kmHigh 28.0°C · Low 16.9°C · 57 mm rain
- Villa Mercedes, Argentina in DecemberArgentina · 344 kmHigh 28.8°C · Low 17.6°C · 96 mm rain
- Olavarría in DecemberArgentina · 355 kmHigh 26.6°C · Low 14.7°C · 80 mm rain
- Junín in DecemberArgentina · 377 kmHigh 28.0°C · Low 17.2°C · 103 mm rain
- Venado Tuerto in DecemberArgentina · 383 kmHigh 28.3°C · Low 17.9°C · 115 mm rain
- Río Cuarto in DecemberArgentina · 388 kmHigh 28.3°C · Low 17.9°C · 107 mm rain
- General Roca in DecemberArgentina · 395 kmHigh 30.2°C · Low 17.0°C · 16 mm rain
- San Luis in DecemberArgentina · 414 kmHigh 28.9°C · Low 18.0°C · 101 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 Santa Rosa) is explained once on the Santa Rosa, Argentina year overview and on the Sources, method and limits page.