Climate averages 1991–2020
Luján 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 Luján: daytime highs average 28.1°C and nights cool to about 17.1°C. By daytime temperature it is the 2nd warmest of the 12 months.
Expect about 93 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 25 min on an average December day.
The nearest other city in this atlas is Pilar (22 km away). In December its highs average 27.9°C, about as warm as Luján, with 93 mm of rain.
Among the 67 cities listed in Argentina, Luján ranks joint 35th of 67 for the warmest December highs and joint 37th of 67 for the driest December (rainfall, lowest first). The mean December high of those 67 cities is 27.9°C; Luján is 0.2°C warmer than that mean.
From December to January, average highs rise by 1.3°C to 29.4°C, and monthly rainfall falls from 93 mm to 91 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
Luján climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 29.4°C18.8°C | 18.8°C | 91 | 7.8 | 14.214 h |
| February | 27.9°C18.0°C | 18.0°C | 101 | 8.3 | 13.413 h |
| March | 25.9°C16.3°C | 16.3°C | 92 | 7.3 | 12.312 h |
| April | 22.0°C12.8°C | 12.8°C | 96 | 8.3 | 11.211 h |
| May | 18.2°C9.8°C | 9.8°C | 66 | 5.9 | 10.310 h |
| June | 15.2°C6.9°C | 6.9°C | 54 | 5.8 | 9.910 h |
| July | 14.4°C5.8°C | 5.8°C | 58 | 5.8 | 10.110 h |
| August | 16.9°C7.1°C | 7.1°C | 61 | 5.5 | 10.811 h |
| September | 18.8°C8.8°C | 8.8°C | 71 | 6.5 | 11.812 h |
| October | 21.6°C11.6°C | 11.6°C | 119 | 9.3 | 12.913 h |
| November | 25.0°C14.3°C | 14.3°C | 94 | 8.2 | 13.914 h |
| December, selected | 28.1°C17.1°C | 17.1°C | 93 | 8.8 | 14.414 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
- Pilar in DecemberArgentina · 22 kmHigh 27.9°C · Low 17.2°C · 93 mm rain
- Moreno in DecemberArgentina · 31 kmHigh 27.8°C · Low 17.2°C · 87 mm rain
- José C. Paz in DecemberArgentina · 32 kmHigh 27.7°C · Low 17.3°C · 92 mm rain
- San Miguel, Argentina in DecemberArgentina · 37 kmHigh 27.4°C · Low 17.5°C · 92 mm rain
- Merlo in DecemberArgentina · 37 kmHigh 27.9°C · Low 17.4°C · 87 mm rain
- Bella Vista in DecemberArgentina · 39 kmHigh 27.7°C · Low 17.5°C · 92 mm rain
- Don Torcuato in DecemberArgentina · 45 kmHigh 27.1°C · Low 18.0°C · 92 mm rain
- Campana in DecemberArgentina · 47 kmHigh 28.1°C · Low 17.3°C · 99 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 Luján) is explained once on the Luján year overview and on the Sources, method and limits page.
Pilar lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.