Merlo climate
Merlo (Argentina) has a humid subtropical climate (Köppen Cfa). The average temperature over the year is 17 °C62 °F, and about 1,108 mm44 in of precipitation falls in an average year.
Temperature by month
Precipitation by month
Merlo climate table
| Month | High °C°F | Low °C°F | Mean °C°F | Precip. mmin | Frost days |
|---|---|---|---|---|---|
| Jan | 3189 | 1865 | 2577 | 1104.3 | 0 |
| Feb | 3085 | 1864 | 2474 | 1254.9 | 0 |
| Mar | 2780 | 1559 | 2170 | 1224.8 | 0 |
| Apr | 2373 | 1152 | 1763 | 1003.9 | 0 |
| May | 1865 | 847 | 1356 | 722.8 | 0 |
| Jun | 1559 | 541 | 1050 | 491.9 | 2 |
| Jul | 1558 | 439 | 949 | 682.7 | 4 |
| Aug | 1762 | 642 | 1152 | 692.7 | 1 |
| Sep | 1967 | 745 | 1356 | 803.2 | 0 |
| Oct | 2373 | 1151 | 1762 | 1134.5 | 0 |
| Nov | 2780 | 1456 | 2068 | 1044.1 | 0 |
| Dec | 3086 | 1661 | 2374 | 973.8 | 0 |
| Year | 3189 | 439 | 1762 | 1,10844 | 7 |
“Year” row: highest monthly high, lowest monthly low, annual mean and annual total. Frost days are for the whole grid cell.
| Month | Humid. | Cloud | Solar | Daylight |
|---|---|---|---|---|
| Jan | 63% | 45% | 7.2 | 14:14 |
| Feb | 68% | 46% | 6.3 | 13:24 |
| Mar | 73% | 43% | 5.2 | 12:24 |
| Apr | 76% | 47% | 3.9 | 11:16 |
| May | 82% | 55% | 2.7 | 10:20 |
| Jun | 83% | 57% | 2.3 | 9:51 |
| Jul | 82% | 58% | 2.4 | 10:03 |
| Aug | 79% | 54% | 3.3 | 10:50 |
| Sep | 76% | 53% | 4.4 | 11:56 |
| Oct | 74% | 53% | 5.5 | 13:02 |
| Nov | 68% | 46% | 6.8 | 13:00 |
| Dec | 63% | 43% | 7.5 | 14:28 |
Humid. = average relative humidity at 2 m; cloud = average cloud amount; solar = average daily solar energy reaching the ground in kWh/m² (all-sky); daylight in hours:minutes, calculated for the 15th of each month.
What the climate of Merlo is like
The warmest month is January, with an average high of 31 °C89 °F and a low of 18 °C65 °F. The coldest is July, when highs average 15 °C58 °F and lows 4 °C39 °F. There is a clear seasonal cycle, with 15.5 °C27.9 °F between the average temperature of the warmest and the coolest month.
It is wet, with about 1,108 mm44 in of precipitation per year. The wettest three-month stretch is January–March, which brings 32% of the annual total. The wettest month is February (125 mm4.9 in), the driest is June (49 mm1.9 in).
Relative humidity ranges from 63% in December to 83% in June. The clearest skies (lowest average cloud amount, 43%) are typical of March. Average wind speed near the ground ranges from 9 km/h (6 mph) in May to 11 km/h (7 mph) in November. Daylight lasts from about 9.8 hours in June to 14.5 hours in December.
Best time to visit Merlo
Based on these averages, the most comfortable months for sightseeing and outdoor activities are March–May and August–November: average highs of 17 °C62 °F to 27 °C80 °F with 69 mm2.7 in to 122 mm4.8 in of precipitation per month.
The most challenging month is January, which is hot, with average highs of 31 °C89 °F.
Comfort score: months are ranked by how close they come to an average high of 21–28 °C (70–82 °F), lows above 5 °C (41 °F), little precipitation and moderate humidity. The best-ranked months of each place are recommended, even where none meets all of these. These are general rules of thumb applied to long-term averages.
What to pack for Merlo
- Summer (December–February) — highs 3085 to 31 °C89 °F, lows 1661 to 18 °C65 °F, about 110 mm4.3 in of precipitation a month. Pack very light, breathable clothing, a sun hat and plenty of water, an extra layer for the cooler mornings and evenings and an umbrella or light rain jacket.
- Autumn (March–May) — highs 1865 to 27 °C80 °F, lows 847 to 15 °C59 °F, about 98 mm3.9 in of precipitation a month. Pack light layers — T-shirts plus a light sweater or jacket, an extra layer for the cooler mornings and evenings and an umbrella or light rain jacket.
- Winter (June–August) — highs 1558 to 17 °C62 °F, lows 439 to 6 °C42 °F, about 62 mm2.4 in of precipitation a month. Pack long sleeves, a sweater and a medium jacket and an extra layer for the cooler mornings and evenings.
- Spring (September–November) — highs 1967 to 27 °C80 °F, lows 745 to 14 °C56 °F, about 99 mm3.9 in of precipitation a month. Pack light layers — T-shirts plus a light sweater or jacket, an extra layer for the cooler mornings and evenings and an umbrella or light rain jacket.
How Merlo compares
Compared with Buenos Aires, about 33 km to the east, Merlo is on average 0.9 °C1.6 °F cooler and receives a similar amount of precipitation. The difference is largest in June (2 °C3.6 °F cooler).
Of the 31 places in Argentina covered by World Climates, Merlo is the 19th warmest by annual mean temperature and the 9th wettest by annual precipitation. See all of them on the Argentina climate page.
Places in other countries with the most similar temperature and rainfall pattern: Liverpool (Australia, Cfa), Montevideo (Uruguay, Cfa) and Bagé (Brazil, Cfa).
The same NASA POWER grid cell also contains José C. Paz (pop. 230,208), San Miguel (pop. 168,762), Moreno (pop. 148,290), Isidro Casanova (pop. 131,981), Castelar (pop. 107,786) and San Justo (pop. 105,274). Their long-term averages in this dataset are essentially the same as for Merlo, so they do not have separate pages.
Nearby places
- Laferrere 16 km · 16 °C62 °F · 1,069 mm42 in
- Buenos Aires 33 km · 18 °C64 °F · 1,103 mm43 in
- Berazategui 48 km · 17 °C62 °F · 1,072 mm42 in
- La Plata 76 km · 17 °C62 °F · 1,072 mm42 in
- San Nicolás de los Arroyos 202 km · 17 °C63 °F · 1,178 mm46 in
- Montevideo 233 km · 17 °C62 °F · 1,183 mm47 in
- Rosario 260 km · 18 °C64 °F · 1,091 mm43 in
- Tandil 298 km · 14 °C57 °F · 907 mm36 in
Frequently asked questions
What is the warmest month in Merlo?
January is the warmest month in Merlo, with an average high of 31 °C (89 °F) and an average low of 18 °C (65 °F).
What is the coldest month in Merlo?
July is the coldest month, with an average high of 15 °C (58 °F) and an average low of 4 °C (39 °F).
When does it rain the most in Merlo?
February is the wettest month with about 125 mm (4.9 in) of precipitation; June is the driest with about 49 mm (1.9 in).
What is the best time to visit Merlo?
Judging by long-term averages, the most comfortable months are March–May and August–November.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.