This is the warmest December I can remember since I moved here.
Yes, December 2025 in Arizona, especially Phoenix, is experiencing record-breaking heat, making it exceptionally warm, likely the hottest on record, far exceeding typical winter weather and surpassing recent years like 2024, driven by a persistent high-pressure ridge and contributing to climate change trends. This heat wave has seen daily highs in the 80s, shattering old records, and is part of a larger pattern of record heat in the Southwest, with scientists noting this unusual warmth is linked to broader climate shifts.
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