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December Weather in Merlo, Argentina

Last updated: August 22, 2025

In December, the average temperature in Merlo, Argentina is a pleasant 21°C (69°F). However, temperatures can vary significantly, dipping as low as 7°C (44°F) and soaring up to a scorching 38°C (100°F). Expect some rain, with an average precipitation of 89 mm (3.5 in) spread over 13 days. During this time, the average humidity hovers around a comfortable 40%.

December Temperature in Merlo

In December in Merlo, the average temperature is 21°C (69°F). The maximum can reach 38°C (100°F), while the minimum can be as low as 7°C (44°F). Pack accordingly to enjoy both the warm days and cooler nights during your travels.

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 21°C (69°F), with highs reaching up to 38°C (100°F) and lows dropping to around 7°C (44°F).
JanFebMarAprMayJunJulAugSepOctNovDec716764605246455155606569
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 89 mm (3.5 in) distributed over 13 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 89 mm (3.5 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec11312291682314105294612189
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 40%. With an average temperature of 21°C (69°F), this humidity feels like a refreshing breeze, making it pleasant for traveling and exploring the surroundings without feeling too sticky or uncomfortable.

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 40%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec40%48%53%63%67%61%55%48%45%43%45%40%
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 reaches an alarming 15, which falls into the extreme Exposure Category. With a time to burn of just 10 minutes, it's crucial to take precautions. For detailed information, you can check the Hourly UV Index in Merlo.

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 15, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec151412864579121415
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 Weather21°C (71°F)113 mm (4.4 inches)40%extreme
February Weather20°C (67°F)122 mm (4.8 inches)48%extreme
March Weather18°C (64°F)91 mm (3.6 inches)53%extreme
April Weather15°C (60°F)68 mm (2.7 inches)63%very high
May Weather11°C (53°F)23 mm (0.9 inches)67%high
June Weather8°C (46°F)14 mm (0.5 inches)61%moderate
July Weather7°C (46°F)10 mm (0.4 inches)55%moderate
August Weather10°C (51°F)5 mm (0.2 inches)48%high
September Weather13°C (56°F)29 mm (1.1 inches)45%very high
October Weather16°C (60°F)46 mm (1.8 inches)43%extreme
November Weather18°C (65°F)121 mm (4.8 inches)45%extreme
December Weather21°C (69°F)89 mm (3.5 inches)40%extreme

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