Climate averages 1991–2020
San Nicolás de los Arroyos weather
in December.
A hot, wet month: the 2nd warmest and the 8th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
December is a hot month in San Nicolás de los Arroyos: daytime highs average 28.4°C and nights cool to about 18.6°C. By daytime temperature it is the 2nd warmest of the 12 months.
Expect about 108 mm of rain on roughly 9 days, which makes December a wet month (the 8th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 14 h 19 min on an average December day.
The nearest other city in this atlas is Gobernador Gálvez (52 km away). In December its highs average 28.7°C, about as warm as San Nicolás de los Arroyos, with 104 mm of rain.
Among the 67 cities listed in Argentina, San Nicolás de los Arroyos ranks joint 30th of 67 for the warmest December highs and 48th of 67 for the driest December (rainfall, lowest first). The mean December high of those 67 cities is 27.9°C; San Nicolás de los Arroyos is 0.5°C warmer than that mean.
From December to January, average highs rise by 1.3°C to 29.7°C, and monthly rainfall falls from 108 mm to 103 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
San Nicolás de los Arroyos climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 29.7°C20.3°C | 20.3°C | 103 | 8.2 | 14.114 h |
| February | 28.1°C19.5°C | 19.5°C | 109 | 8.1 | 13.313 h |
| March | 26.3°C17.8°C | 17.8°C | 117 | 7.4 | 12.312 h |
| April | 22.4°C14.5°C | 14.5°C | 106 | 8.1 | 11.311 h |
| May | 18.7°C11.5°C | 11.5°C | 66 | 6.0 | 10.410 h |
| June | 15.8°C8.7°C | 8.7°C | 44 | 5.2 | 10.010 h |
| July | 15.1°C7.4°C | 7.4°C | 42 | 5.1 | 10.210 h |
| August | 17.8°C8.6°C | 8.6°C | 56 | 5.0 | 10.911 h |
| September | 20.0°C10.4°C | 10.4°C | 67 | 6.3 | 11.912 h |
| October | 22.7°C13.3°C | 13.3°C | 112 | 9.7 | 12.913 h |
| November | 25.9°C16.1°C | 16.1°C | 115 | 7.6 | 13.814 h |
| December, selected | 28.4°C18.6°C | 18.6°C | 108 | 8.6 | 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
- Gobernador Gálvez in DecemberArgentina · 52 kmHigh 28.7°C · Low 18.6°C · 104 mm rain
- Rosario in DecemberArgentina · 59 kmHigh 28.8°C · Low 18.5°C · 104 mm rain
- Pergamino in DecemberArgentina · 70 kmHigh 28.2°C · Low 17.5°C · 107 mm rain
- Zárate in DecemberArgentina · 139 kmHigh 28.0°C · Low 17.4°C · 104 mm rain
- Campana in DecemberArgentina · 148 kmHigh 28.1°C · Low 17.3°C · 99 mm rain
- Junín in DecemberArgentina · 156 kmHigh 28.0°C · Low 17.2°C · 103 mm rain
- Gualeguaychú in DecemberArgentina · 162 kmHigh 28.6°C · Low 18.3°C · 128 mm rain
- Venado Tuerto in DecemberArgentina · 169 kmHigh 28.3°C · Low 17.9°C · 115 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 San Nicolás de los Arroyos) is explained once on the San Nicolás de los Arroyos year overview and on the Sources, method and limits page.