Summary (tl;dr)

Unusual and severe cold weather is simultaneously impacting the Western United States and large parts of Argentina, prompting widespread alerts for freezing temperatures, snow, and potential damage to agriculture.

Essential Background

June typically marks the beginning of summer in the Northern Hemisphere and early winter in the Southern Hemisphere. While some cold weather is expected in southern regions during this time, the intensity and timing of the current cold snaps are highly unusual, particularly in the Western U.S. where warmer-than-average temperatures were largely anticipated for the month.

The Full Story

The keyword "frío" (cold) is trending globally due to two significant and atypical cold weather events. In the Western United States, an unseasonable cold wave between June 10 and 11, 2026, brought winter weather advisories, snow, and freezing temperatures as low as -2°C (28°F) to states including Montana, Idaho, Oregon, California, and Nevada. This unexpected cold snap in June has raised concerns for sensitive crops, seasonal plants, and mountain travel safety.

Concurrently, a powerful polar air mass has descended upon Argentina, triggering the first major cold wave of 2026, which began around June 13, 2026. This has resulted in widespread frosts and sub-zero temperatures across central and southern Argentina, with some areas experiencing lows near -6°C. Provinces such as Buenos Aires, La Pampa, Mendoza, San Luis, Córdoba, Tucumán, Catamarca, and San Juan are significantly affected, with Patagonia experiencing strong winds. Forecasts also indicate a threat of freezing temperatures in southern Brazil's coffee-growing regions around June 15-16, 2026. Additionally, an unusual cold front is expected to bring heavy rains to parts of northern Mexico, including Coahuila, Nuevo León, and Tamaulipas, on June 15, 2026.

Why It Matters

These widespread and unusual cold fronts carry significant implications for various sectors. In the Western U.S., the unseasonable frosts and snow threaten agricultural yields and could damage delicate seasonal crops, leading to economic losses for farmers. Similarly, the intense polar wave in Argentina and the risk of a freeze in Brazil's coffee-producing areas could devastate agricultural production, impacting both local economies and global commodity markets. Beyond economic concerns, the extreme cold poses moderate to severe health risks, particularly for vulnerable populations, prompting health authorities to issue urgent care recommendations. These events underscore the unpredictable nature of global climate patterns, even amid broader trends of developing El Niño conditions that were anticipated to bring warmer temperatures in other regions.

Geographic Location

• Montana, United States (unusual June cold wave, winter weather advisories, snow, freezing temperatures, Beartooth Highway impacts)
• Idaho, United States (unusual June cold wave, winter weather advisories, snow, freezing temperatures)
• Oregon, United States (unusual June cold wave, winter weather advisories, snow, freezing temperatures)
• Northern California, United States (unusual June cold wave, winter weather advisories, snow, freezing temperatures)
• Elko County, Nevada, United States (frost warnings, unusual June cold wave, freezing temperatures)
• City of Buenos Aires, Buenos Aires Province, Argentina (temperatures near 0°C, "yellow alert" for extreme cold)
• Buenos Aires Province, Argentina (first major polar wave of 2026, widespread frosts)
• La Pampa Province, Argentina (first major polar wave of 2026, temperatures below zero, widespread frosts, "yellow alert" for extreme cold)
• Mendoza Province, Argentina (first major polar wave of 2026, temperatures below zero, widespread frosts, "yellow alert" for extreme cold, snow in cordillera)
• San Luis Province, Argentina (first major polar wave of 2026, temperatures below zero, widespread frosts, "yellow alert" for extreme cold)
• Córdoba Province, Argentina (first major polar wave of 2026, temperatures below zero, widespread frosts)
• Tucumán Province, Argentina (first major polar wave of 2026, temperatures below zero, widespread frosts)
• Catamarca Province, Argentina (first major polar wave of 2026, temperatures below zero, widespread frosts)
• San Juan Province, Argentina (first major polar wave of 2026, temperatures below zero, widespread frosts)
• Patagonia, Argentina (strong winds and extreme thermal sensations due to polar air mass)
• Southern Brazil (cold weather threat, risk of freeze in coffee-growing areas)
• Coahuila, Mexico (unusual cold front bringing very strong rains in the northeast)
• Nuevo León, Mexico (unusual cold front bringing very strong rains in the north)
• Tamaulipas, Mexico (unusual cold front bringing very strong rains in the northwest and north)