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Monthly climate in Merlo, Argentina

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Merlo features a cold semi-arid climate (BSk). Temperatures typically range between 7 °C (46 °F) and 21 °C (71 °F) through the year, but rarely can drop to -7 °C (20 °F) or can rise to as high as 38 °C (100 °F). The average annual precipitation amounts to about 729 mm (28.7 inches) and receives 98 rainy days on the 1 mm (0.04 inches) threshold annually. Merlo enjoys an average of 3779 hours of sunshine throughout the year, and daylight varies from 10 hours 2 minutes to 14 hours 13 minutes per day.

Monthly average temperatures in Merlo, Argentina

The warmest months in Merlo are January, February and December, with daily mean temperatures ranging from 20 to 21 °C (67 - 71 °F) throughout the day. The coldest temperatures usually occur in June, July and August, when daily mean temperatures range from 7 to 10 °C (46 - 51 °F) throughout the day. On average each year, Merlo experiences 101 days above 25 °C (77.0 °F) and 20 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Merlo. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum36°C
(97°F)		33°C
(92°F)		31°C
(88°F)		28°C
(83°F)		28°C
(83°F)		23°C
(74°F)		24°C
(76°F)		28°C
(83°F)		32°C
(91°F)		36°C
(96°F)		32°C
(91°F)		38°C
(100°F)
Mean maximum33°C
(91°F)		31°C
(89°F)		30°C
(86°F)		27°C
(80°F)		24°C
(75°F)		20°C
(68°F)		23°C
(73°F)		27°C
(81°F)		31°C
(87°F)		32°C
(91°F)		32°C
(89°F)		34°C
(94°F)
Average high27°C
(81°F)		25°C
(78°F)		24°C
(75°F)		21°C
(71°F)		18°C
(64°F)		15°C
(59°F)		14°C
(58°F)		18°C
(65°F)		20°C
(69°F)		22°C
(73°F)		25°C
(77°F)		27°C
(80°F)
Daily mean21°C
(71°F)		20°C
(67°F)		18°C
(64°F)		15°C
(60°F)		11°C
(53°F)		8°C
(46°F)		7°C
(46°F)		10°C
(51°F)		13°C
(56°F)		16°C
(60°F)		18°C
(65°F)		21°C
(69°F)
Average low16°C
(61°F)		15°C
(59°F)		13°C
(55°F)		11°C
(51°F)		7°C
(44°F)		2°C
(37°F)		2°C
(36°F)		4°C
(39°F)		7°C
(44°F)		9°C
(49°F)		12°C
(55°F)		15°C
(59°F)
Mean minimum11°C
(51°F)		8°C
(47°F)		6°C
(42°F)		4°C
(39°F)		-1°C
(31°F)		-3°C
(26°F)		-5°C
(23°F)		-4°C
(25°F)		-1°C
(31°F)		2°C
(36°F)		6°C
(44°F)		9°C
(48°F)
Minimum8°C
(46°F)		5°C
(42°F)		2°C
(36°F)		1°C
(35°F)		-3°C
(26°F)		-6°C
(21°F)		-7°C
(20°F)		-6°C
(22°F)		-3°C
(28°F)		1°C
(34°F)		4°C
(39°F)		7°C
(44°F)

Compare climate in Merlo with other places

Compare temperature, precipitation, sunshine, UV index in Merlo, Argentina with other places around the world.

Monthly average precipitation in Merlo, Argentina

Merlo usually has the most precipitation in January, February and November, with an average of 13 rainy days and 118 mm (4.7 inches) of precipitation per month. The driest months in Merlo are June, July and August. On average, 9 mm (0.4 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Merlo. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)113 (4.4)122 (4.8)91 (3.6)68 (2.7)23 (0.9)14 (0.5)10 (0.4)5 (0.2)29 (1.1)46 (1.8)121 (4.8)89 (3.5)
Average precipitation days (≥ 1 mm)13141275232491413

Monthly sunshine hours in Merlo, Argentina

The sunniest months in Merlo are October, November and December, when the sun shines an average of 11 hours 57 minutes a day. Least sunny months in Merlo: May, June and July receive an average of 8 hours 45 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Merlo. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours310327330278263264276312314345363391
Mean daily daylight hours13h 58m13h 12m12h 14m11h 14m10h 26m10h 2m10h 15m10h 58m11h 54m12h 54m13h 46m14h 13m

Solar UV radiation in Merlo, Argentina

Merlo experiences the highest level of ultraviolet (UV) radiation in January, November and December, when the maximum UV index can reach values of 14 - 15, which corresponds to the Extreme category of sun exposure. May, June and July are in the Moderate / High exposure category. In these months, the maximum values of the UV index do not exceed 6. For more detailed information, check out our hourly Merlo UV Index data.

Average daily maximum UV levels by month for Merlo. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)151412864579121415