Ask the Weather Guys: How did 2019 global and US weather align with climate trends?
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Ask the Weather Guys: How did 2019 global and US weather align with climate trends?

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Flooding

In the contiguous United States the year 2019 was the second-wettest year on record.

Q: How did 2019 weather align with climate trends?

A: Government scientists concluded that the globally averaged temperature for 2019 was 1.71 degrees above the 20th century average. This is the 43rd consecutive year that the global temperature was above the 20th century average.

This was the second-highest since record keeping began in 1880 and was just 0.07 degrees less than the record value set in 2016. Nine of the 10 warmest years have occurred since 2005, and the five warmest years have occurred since 2015.

Overall, North America’s temperature was 1.62 degrees above the 1910–2000 average, marking the 14th-warmest year. Record high annual temperatures were measured across parts of central Europe, Asia, Australia, New Zealand and southern Africa.

The average annual temperature for the contiguous U.S., which doesn’t include Alaska or Hawaii, was 52.7, or 0.7 degrees above the 20th century average. This ranked in the warmest third of the record and was the coldest year since 2014.

The contiguous U.S. average annual precipitation was 34.78 inches, 4.84 inches above the long-term average. The year 2019 was the second-wettest year on record.

Also, 2019 saw the continued trend in the decline of Arctic sea ice extent. The average annual sea ice extent in the Arctic was approximately 3.94 million square miles, the second-smallest in the 1979-2019 record. This continues a trend of sea ice loss of about 18,000 square miles per year.

Over the 41-year satellite record of sea ice coverage in December, the Arctic has lost about 734,000 square miles of ice. The extent of sea ice around the Antarctic was also the second-smallest annually averaged value on record.

"Weather Guys" Steve Ackerman and Jonathan Martin are professors in the University of Wisconsin-Madison department of atmospheric and oceanic sciences.

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