Arizona desert town breaks record for hottest March temperature in US history

The Guardian US News
by Guardian staff and agencies
March 20, 2026
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3 min read

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The Bottom Line

Martinez Lake, Arizona recorded 110°F in March, breaking the US record for hottest temperature in that month.

How This Affects You

Early season extreme heat threatens water supplies, power grid stability, and vulnerable populations across the American West, with potential costs to utilities and residents.

AI Summary

Martinez Lake, a small community about 145 miles west of Phoenix, recorded 110°F on Thursday, breaking the record for the hottest March temperature ever measured in the United States. The reading was confirmed by the National Weather Service as part of a broader southwest heat wave gripping the region in late winter. March temperature records are significant markers of climate patterns, as they typically reflect seasonal transitions rather than peak summer heat, making such extreme readings unusual for the month. The record underscores intensifying heat trends in the American West, where desert communities are increasingly experiencing unseasonable temperature spikes. The scorching conditions have raised concerns about early-season heat stress on the region's infrastructure, water supplies, and vulnerable populations.

What's Being Done

The National Weather Service confirmed the temperature reading as part of monitoring a broader southwest heat wave.

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