Rosario de Lerma in Summer
In summer (December, January and February), Rosario de Lerma sees average daytime highs around 24°C and overnight lows near 16°C, with 592 mm of rain over about 68 wet days across the season. It is the warmest season of the year and the wettest season of the year.
Across summer, daytime highs hold fairly steady around 24°C. The sky is clear or mostly clear about 11% of the time across summer, and the air most often feels humid.
Summer is Rosario de Lerma's weakest season of the year to visit on our travel score. For the whole year in context, see Rosario de Lerma's year-round climate.
- Avg daytime high
- 24°C
- warmest season of the year
- Avg overnight low
- 16°C
- Rainfall
- 592 mm
- 68 wet days
- Avg wind
- 5 km/h
- Travel score
- 4.7
- weakest season of the year
- Months
- Dec · Jan · Feb
Temperature in Rosario de Lerma in Summer
Across summer, daytime highs hold fairly steady around 24°C.
A typical summer day in Rosario de Lerma reaches about 24°C and drops to 16°C overnight. The warmest of the three months is December, the coolest December.
Rosario de Lerma weather by month
How the three summer months (December, January and February) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | 24° / 16° | 216 | 24.3 | 0 | 13.4 | 4.6 |
| Feb | 23° / 16° | 195 | 22.7 | 0 | 12.9 | 4.4 |
| Mar | 22° / 15° | 202 | 23.8 | 0 | 12.2 | 4.4 |
| Apr | 20° / 12° | 129 | 19.5 | 0.1 | 11.4 | 4.7 |
| May | 17° / 8° | 74 | 13.6 | 0.2 | 10.8 | 5.1 |
| Jun | 16° / 5° | 36 | 8.2 | 0.4 | 10.5 | 5.5 |
| Jul | 16° / 4° | 28 | 6.7 | 0.7 | 10.6 | 5.8 |
| Aug | 18° / 6° | 27 | 5.8 | 0.3 | 11.1 | 7.0 |
| Sep | 20° / 8° | 39 | 7.6 | 0.1 | 11.8 | 7.0 |
| Oct | 22° / 12° | 91 | 14 | 0.1 | 12.6 | 6.2 |
| Nov | 23° / 14° | 126 | 16.5 | 0 | 13.2 | 5.7 |
| Dec | 24° / 15° | 181 | 21.2 | 0 | 13.5 | 5.0 |
Cloud cover in Summer
The sky is clear or mostly clear about 11% of the time across summer.
Chance of precipitation in Summer
Rosario de Lerma gets around 592 mm of rain over 68 wet days across summer. The line is the day-by-day chance of measurable precipitation.
Humidity in Summer
Most of summer feels humid — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Summer
Winds average 5 km/h across summer.
Sunrise & sunset in Summer
Daylight runs from about 13 h 24 min in early December to 12 h 36 min by late February. The lit band spans sunrise to sunset each day.
Solar energy in Summer
Average shortwave solar energy reaching the ground each day across summer, about 5.7 kWh/m².
Hazard calendar for Rosario de Lerma
In summer, Rosario de Lerma overlaps its rainy season season. The full year is below, with each hazard's peak months called out.
Rosario de Lerma's rainy season runs November–April, when most of the year's rain falls.
Is summer a good time to visit Rosario de Lerma?
Our two travel scores rate summer for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
summer is a reasonable time to visit Rosario de Lerma for sightseeing.
What to pack for Rosario de Lerma in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Rosario de Lerma sees daytime highs around 24°C and nights near 16°C. Pack rain gear and sun protection. Worth having: light clothes. About 68 days see rain.
UV index in Rosario de Lerma in Summer
Clear-sky midday UV across summer averages around 16 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Rosario de Lerma peaks around January 16 at about 16 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 10 at about 6 (high).
The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 16 | 16 | 14 | 9 | 7 | 6 | 6 | 8 | 10 | 13 | 15 | 16 |
| Level | Extreme | Extreme | Extreme | Very high | Very high | High | High | Very high | Extreme | Extreme | Extreme | Extreme |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 16 | Extreme |
| Feb | 16 | Extreme |
| Mar | 14 | Extreme |
| Apr | 9 | Very high |
| May | 7 | Very high |
| Jun | 6 | High |
| Jul | 6 | High |
| Aug | 8 | Very high |
| Sep | 10 | Extreme |
| Oct | 13 | Extreme |
| Nov | 15 | Extreme |
| Dec | 16 | Extreme |
Where is Rosario de Lerma?
Rosario de Lerma sits at 25.0°S, 65.6°W, 1,421 m above sea level, in Argentina. The nearest listed city is San José de los Cerrillos, 14 km away.
Topography around Rosario de Lerma
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Rosario de Lerma.
Within 3 km, the terrain around Rosario de Lerma has only modest variations in elevation — a maximum elevation change of 103 m around an average of 1,318 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,912 m; within 80 km, extreme variations in elevation — a maximum elevation change of 5,593 m.
The land around Rosario de Lerma is covered by cropland (66%) within 3 km, cropland (45%) and trees (38%) within 16 km, and trees (37%), grassland (23%) and bare terrain (23%) within 80 km.
Argentina travel facts
- Travel advisory
- Level 1
- Exercise Normal Precautions
- Power plugs
- Type C / I
- 220 V · 50 Hz
- Prices
- ≈ 46% of US
- price level, 2025
- GDP per capita
- $14,898
- 2025
- Happiness
- 6.4 / 10
- World Happiness, 2025
- Homicide rate
- 4.5
- per 100k, 2023
- Road deaths
- 14.1
- per 100k/yr, 2019
- Income group
- Upper middle
- World Bank
- English
- High
- EF EPI 575
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Rosario de Lerma (-24.9858°, -65.5784°, elevation 1,421 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google.