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Today was the warmest April 8 ever recorded in Seattle, reaching 70 degrees at both Seattle-Tacoma International Airport and the National Weather Service at Seattle’s Magnuson Park.

The old mark was 69 degrees in 1996.

Last year, Seattle hit the 70 mark very late — on May 20. The latest 70-degree onset recorded was May 23, 2003.

Remarkably, today’s warmth arrived not long after frost formed on some Seattle houses and cars yesterday morning. The fast-changing temperatures happened because of a mostly clear sky and dry air being pushed toward Seattle from eastern Washington.

This pattern will continue tomorrow, but highs will reach only into the 60s, said Gary Schneider, a Weather Service meteorologist.