Climate averages 1991–2020
Bahía Blanca weather
in December.
A hot, moderately wet month: the joint 2nd warmest and the 8th 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 Bahía Blanca: daytime highs average 28.0°C and nights cool to about 16.9°C. By daytime temperature it is the joint 2nd warmest of the 12 months.
Expect about 57 mm of rain on roughly 6 days, which makes December a moderately wet month (the 8th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 14 h 49 min on an average December day.
The nearest other city in this atlas is Olavarría (265 km away). In December its highs average 26.6°C, 1.4°C cooler than Bahía Blanca, with 80 mm of rain.
Among the 67 cities listed in Argentina, Bahía Blanca ranks joint 37th of 67 for the warmest December highs and 13th of 67 for the driest December (rainfall, lowest first). The mean December high of those 67 cities is 27.9°C; Bahía Blanca is 0.1°C warmer than that mean.
From December to January, average highs rise by 1.7°C to 29.7°C, and monthly rainfall falls from 57 mm to 54 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
Bahía Blanca climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 29.7°C18.7°C | 18.7°C | 54 | 7.1 | 14.515 h |
| February | 28.0°C17.7°C | 17.7°C | 65 | 6.7 | 13.614 h |
| March | 25.3°C16.0°C | 16.0°C | 67 | 6.7 | 12.412 h |
| April | 20.7°C12.2°C | 12.2°C | 55 | 6.0 | 11.111 h |
| May | 16.7°C9.2°C | 9.2°C | 38 | 5.4 | 10.110 h |
| June | 13.4°C6.2°C | 6.2°C | 28 | 4.4 | 9.510 h |
| July | 12.7°C5.0°C | 5.0°C | 34 | 5.0 | 9.710 h |
| August | 15.1°C6.4°C | 6.4°C | 35 | 4.7 | 10.611 h |
| September | 17.6°C8.0°C | 8.0°C | 45 | 6.2 | 11.812 h |
| October | 20.6°C10.9°C | 10.9°C | 64 | 7.7 | 13.113 h |
| November | 24.5°C14.0°C | 14.0°C | 63 | 7.0 | 14.214 h |
| December, selected | 28.0°C16.9°C | 16.9°C | 57 | 6.2 | 14.815 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
- Olavarría in DecemberArgentina · 265 kmHigh 26.6°C · Low 14.7°C · 80 mm rain
- Santa Rosa, Argentina in DecemberArgentina · 294 kmHigh 28.9°C · Low 17.5°C · 85 mm rain
- Necochea in DecemberArgentina · 307 kmHigh 23.0°C · Low 15.0°C · 65 mm rain
- Tandil in DecemberArgentina · 315 kmHigh 25.9°C · Low 13.7°C · 76 mm rain
- Mar del Plata in DecemberArgentina · 418 kmHigh 23.7°C · Low 14.9°C · 69 mm rain
- General Roca in DecemberArgentina · 462 kmHigh 30.2°C · Low 17.0°C · 16 mm rain
- Junín in DecemberArgentina · 473 kmHigh 28.0°C · Low 17.2°C · 103 mm rain
- Cipolletti in DecemberArgentina · 496 kmHigh 30.1°C · Low 16.7°C · 14 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 Bahía Blanca) is explained once on the Bahía Blanca year overview and on the Sources, method and limits page.