Climate averages 1991–2020
Olavarría weather
in December.
A warm, moderately wet month: the 2nd warmest and the 7th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
December is a warm month in Olavarría: daytime highs average 26.6°C and nights cool to about 14.7°C. By daytime temperature it is the 2nd warmest of the 12 months.
Expect about 80 mm of rain on roughly 9 days, which makes December a moderately wet month (the 7th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 14 h 38 min on an average December day.
The nearest other city in this atlas is Tandil (116 km away). In December its highs average 25.9°C, 0.8°C cooler than Olavarría, with 76 mm of rain.
Among the 67 cities listed in Argentina, Olavarría ranks joint 55th of 67 for the warmest December highs and 19th of 67 for the driest December (rainfall, lowest first). The mean December high of those 67 cities is 27.9°C; Olavarría is 1.3°C cooler than that mean.
From December to January, average highs rise by 1.3°C to 27.9°C, and monthly rainfall rises from 80 mm to 92 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
Olavarría climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 27.9°C16.4°C | 16.4°C | 92 | 9.3 | 14.414 h |
| February | 26.3°C15.7°C | 15.7°C | 76 | 7.8 | 13.513 h |
| March | 23.9°C13.9°C | 13.9°C | 81 | 8.0 | 12.312 h |
| April | 19.8°C10.5°C | 10.5°C | 85 | 7.8 | 11.211 h |
| May | 16.0°C7.7°C | 7.7°C | 47 | 5.7 | 10.210 h |
| June | 12.8°C4.7°C | 4.7°C | 37 | 4.6 | 9.710 h |
| July | 12.1°C3.6°C | 3.6°C | 38 | 5.2 | 9.910 h |
| August | 14.7°C4.9°C | 4.9°C | 54 | 5.0 | 10.711 h |
| September | 16.8°C6.4°C | 6.4°C | 62 | 6.7 | 11.812 h |
| October | 19.7°C9.2°C | 9.2°C | 90 | 9.2 | 13.013 h |
| November | 23.2°C11.9°C | 11.9°C | 94 | 8.9 | 14.114 h |
| December, selected | 26.6°C14.7°C | 14.7°C | 80 | 8.7 | 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
- Tandil in DecemberArgentina · 116 kmHigh 25.9°C · Low 13.7°C · 76 mm rain
- Necochea in DecemberArgentina · 231 kmHigh 23.0°C · Low 15.0°C · 65 mm rain
- Junín in DecemberArgentina · 262 kmHigh 28.0°C · Low 17.2°C · 103 mm rain
- Bahía Blanca in DecemberArgentina · 265 kmHigh 28.0°C · Low 16.9°C · 57 mm rain
- San Vicente in DecemberArgentina · 269 kmHigh 27.4°C · Low 16.8°C · 86 mm rain
- Mar del Plata in DecemberArgentina · 273 kmHigh 23.7°C · Low 14.9°C · 69 mm rain
- Ezeiza in DecemberArgentina · 279 kmHigh 27.5°C · Low 17.2°C · 85 mm rain
- Luján in DecemberArgentina · 281 kmHigh 28.1°C · Low 17.1°C · 93 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 Olavarría) is explained once on the Olavarría year overview and on the Sources, method and limits page.