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It has been so warm in the United States this year, especially in March, that national records were not just broken, they were deep-fried.
Temperatures in the lower 48 states were 8.6 degrees (4.8 degrees Celsius) above normal for March and 6 degrees (3.3 degrees Celsius) higher than average for the first three months of the year, according to calculations by the National Oceanic and Atmospheric Administration. That far exceeds the old records.
The magnitude of how unusual the year has been in the U.S. has alarmed some meteorologists who have warned about global warming. .......
But the month where the warmth turned especially weird in the United States was March.
Normally, March averages 42.5 degrees (5.8 degrees Celsius) across the country. This year, the average was 51.1 (10.6 degrees Celsius), which is closer to the average for April. Only one other time, in January 2006, was the country as a whole that much hotter than normal for an entire month.
The "icebox of America," International Falls, Minn., saw temperatures in the 70s for five days in March, and there were only three days of below zero temperatures all month.
In March, at least 7,775 weather stations across the nation broke daily high temperature records, and another 7,517 broke records for night-time heat. Combined, that is more high temperature records broken in one month than ever before, Crouch says.
"When you look at what's happened in March this year, it's beyond unbelievable," says Univ. of Victoria climate scientist Andrew Weaver.....
They seem to be falling far more often because of global warming, says NASA top climate scientist James Hansen. In a paper he submitted to the journal Proceedings of the National Academy of Sciences and posted on a physics research archive, Hansen shows that heat extremes aren't just increasing but happening far more often than scientists thought.
What used to be a 1-in-400 hot temperature record is now a 1 in 10 occurrence, essentially 40 times more likely, says Hansen. The warmth in March is an ideal illustration of this, says Hansen, who also has become an activist in fighting fossil fuels.
Weaver, who reviewed the Hansen paper and called it "one of the most stunning examples of evidence of global warming."
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