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December Weather in Merlo, Argentina

Last updated: August 22, 2025

In December, the average temperature in Merlo, Argentina is a comfortable 23°C (73°F). However, don't be surprised by the fluctuations, as it can drop as low as 7°C (45°F) or soar to a sizzling 38°C (101°F). Expect 68 mm (2.7 in) of precipitation spread over about 8 days, and enjoy a moderate average humidity of 56%. Whether you're exploring the outdoors or soaking in the sights, this month promises a dynamic climate!

December Temperature in Merlo

In December in Merlo, the average temperature is 23°C (73°F), with maximums reaching up to 38°C (101°F) and minimums dropping as low as 7°C (45°F). This mild to warm climate makes Merlo an ideal destination for travelers looking to enjoy a range of outdoor activities and pleasant weather.

December Weather in Merlo: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Merlo, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Merlo, December typically has an average temperature of 23°C (73°F), with highs reaching up to 38°C (101°F) and lows dropping to around 7°C (45°F).
JanFebMarAprMayJunJulAugSepOctNovDec767370655752505357626873
Data source: Temperature data for Merlo generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in Merlo

In Merlo in December, the precipitation amount is 68 mm (2.7 in) spread over 8 days.

December Precipitation Trends in Merlo

The chart displays monthly precipitation patterns in Merlo, with values for each month alongside December’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how December’s conditions compare to those of other months. In Merlo, December typically receives around 68 mm (2.7 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec676372836856534575967468
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Merlo

In Merlo in December, humidity is 56%. With an average temperature of 23°C (73°F), this humidity feels like a warm embrace that makes traveling feel slightly sticky, yet still comfortable enough to explore outdoors without feeling overwhelmed.

December Average Humidity in Merlo

This chart illustrates the average monthly humidity levels in Merlo, with December’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In December, average humidity in Merlo is approximately 56%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec51%61%66%80%85%80%69%66%72%63%59%56%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Merlo

In Merlo in December, the maximum UV index is 14, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, so it's crucial to take precautions. For the detailed hourly UV index in Merlo, you can check here.

Maximum UV Index Levels in Merlo for December

The chart shows the monthly maximum UV Index (UVI) for Merlo in December, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In December, the maximum UV index in Merlo typically reaches 14, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec141211753468101314
Data source: Merlo December UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How December Weather in Merlo Compares to Other Months

Weather in Merlo varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Merlo, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Merlo, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather24°C (76°F)67 mm (2.6 inches)50%extreme
February Weather23°C (74°F)63 mm (2.5 inches)61%extreme
March Weather21°C (70°F)72 mm (2.8 inches)66%extreme
April Weather18°C (65°F)83 mm (3.3 inches)80%high
May Weather14°C (57°F)68 mm (2.7 inches)85%moderate
June Weather11°C (52°F)56 mm (2.2 inches)80%moderate
July Weather10°C (51°F)53 mm (2.1 inches)69%moderate
August Weather12°C (53°F)45 mm (1.8 inches)66%high
September Weather14°C (58°F)75 mm (3.0 inches)72%very high
October Weather17°C (62°F)96 mm (3.8 inches)63%very high
November Weather20°C (69°F)74 mm (2.9 inches)59%extreme
December Weather23°C (73°F)68 mm (2.7 inches)56%extreme

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