Luján climate — normals and trends
Luján (Argentina) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 16.8 °C and it receives 944 mm of precipitation per year.
These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.
The warmest month is January (24.1 °C on average) and the coldest is July (9.9 °C). Rainfall peaks in March.
Luján averages 7 frost days, 46 hot days (≥ 30 °C) and 89 rainy days per year.
No statistically significant temperature trend emerges for Luján between 1940 and 2025: over this span, year-to-year swings outweigh the climate signal.
The hottest day of the period reached 42.0 °C (on 11 January 1957) and the coldest -7.9 °C (on 14 June 1967).
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
Climate normals · ERA5
LujánBuenos Aires
- coords
- -34.57°, -59.11°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
16.8°C
Average daily high
22.2°C
Average daily low
11.9°C
Annual rainfall
944mm
Sunshine / day
9.5h
Mean relative humidity
73%
Average peak wind
18.5km/h
Seasonal range
14.2°C
Frost days (< 0 °C)
7 d/yr
Hot days (≥ 30 °C)
46 d/yr
Rainy days (≥ 1 mm)
89 d/yr
Annual snowfall
0.0 cm
Average feels-like high
21.8 °C
Average feels-like low
10.3 °C
Average peak gust
35.1 km/h
Tropical nights (≥ 20 °C)
28 d/yr
Solar radiation
17.2 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
No clear trend over this period
Over a short window, year-to-year swings outweigh the climate signal. Try 86 years.
Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).
A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.
Records for the period
Hottest day
42.0 °C
11 January 1957
Coldest day
-7.9 °C
14 June 1967
Wettest day
154 mm
3 February 1990
Windiest day
55.9 km/h
16 May 2000
Strongest gust
104.8 km/h
16 May 2000
Hottest feels-like
42.8 °C
1 February 1947
Coldest feels-like
-12.1 °C
14 June 1967
Snowiest day
0.9 cm
9 July 2007
Sunniest day
14.0 h
3 January 1940
Normals computed over complete calendar years 1940–2025.
A specific year
Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?
Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 31.9 °C | +2.0 °C | 36 mm | -54 mm |
| Feb | 30.2 °C | +1.6 °C | 111 mm | +14 mm |
| Mar | 26.5 °C | +0.2 °C | 141 mm | +36 mm |
| Apr | 21.9 °C | -0.4 °C | 63 mm | -23 mm |
| May | 19.6 °C | +1.1 °C | 140 mm | +73 mm |
| Jun | 14.6 °C | -0.7 °C | 17 mm | -31 mm |
| Jul | 15.7 °C | +0.8 °C | 24 mm | -29 mm |
| Aug | 17.2 °C | +0.6 °C | 121 mm | +62 mm |
| Sep | 19.4 °C | +0.6 °C | 78 mm | +6 mm |
| Oct | 23.2 °C | +1.6 °C | 89 mm | -15 mm |
| Nov | 24.5 °C | -0.6 °C | 95 mm | +8 mm |
| Dec | 30.6 °C | +2.2 °C | 45 mm | -31 mm |
The year's extremes
What was the weather like that day?
Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.
Frequently asked questions
What is the climate of Luján?
Luján has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 16.8 °C and it receives 944 mm of precipitation per year.
What is the hottest day ever recorded in Luján?
The hottest day measured in Luján between 1940 and 2025 was 11 January 1957, reaching 42.0 °C.
What is the coldest day in Luján?
The coldest day measured in Luján between 1940 and 2025 was 14 June 1967, at -7.9 °C.
Does it snow in Luján?
Almost never: Luján sees virtually no snow, with about 7 frost days per year.
Has the climate of Luján warmed?
Between 1940 and 2025, no statistically significant temperature trend emerges in Luján.
What is the wettest day in Luján?
The wettest day measured in Luján between 1940 and 2025 was 3 February 1990, with 154 mm of rain in 24 hours.
What was the windiest day in Luján?
The windiest day measured in Luján between 1940 and 2025 was 16 May 2000, with winds reaching 55.9 km/h.
What is the warmest month in Luján?
The warmest month in Luján is January (24.1 °C on average); the coldest is July (9.9 °C).
How much does it rain in Luján?
Luján receives on average 944 mm of precipitation per year, spread over about 89 rainy days.
Is it sunny in Luján?
Luján gets on average 9.5 hours of sunshine per day, roughly 3,468 hours per year over 1940-2025.
What is the biggest single-day snowfall in Luján?
The heaviest 24-hour snowfall measured in Luján between 1940 and 2025 was 9 July 2007, with 0.9 cm.
Are there tropical nights in Luján?
Yes: Luján has on average 28 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Luján?
In Luján, between 1940 and 2025, the highest apparent temperature reached 42.8 °C on 1 February 1947, and the lowest was -12.1 °C on 14 June 1967.
Compare Luján with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Luján