January 10, 2019
Climate Central calculated the average annual temperatures at 244 individual U.S. stations throughout their periods of record, highlighted the decade in which each record hot year was established, and showed the breakdown of each station’s records by decade.
Percentage of weather stations with their hottest year on record by decade — hottest year highlighted Only one place in our sample had its hottest year on record in 2018 — Palm Springs, California. On the broader scale, 2018 is the first time since 2014 that the U.S as a whole did not have one of its 10 hottest years. Of the stations analyzed, 53 percent experienced their hottest year during the decade of the 2010s, consistent with this being the hottest decade on record in the U.S. This far exceeds the second-place decade of the 1930s, when 18 percent notched their hottest year on record. Periods of record vary, but 70 percent of stations were active by the 1930s and 96 percent were active by the 1960s.
Despite a cooler than normal November, 2018 was still running way above average — year-to-date temperatures through November were 16th warmest on record. Through December 22, the last day before the government shutdown made data inaccessible, the number of daily record highs in 2018 outnumbered the number of daily record lows by a ratio of 1.68-to-1. That ratio may not be as dramatic as in recent years, but even with local short-term warming and cooling, overall warming from the buildup of greenhouse gases in the atmosphere continues to drive the long-term temperature trend.
Methodology: Data was gathered from the Applied Climate Information System. Average annual temperature was determined using the average of days (not the average of months). Years with more the 30 days of missing data were removed from the analysis. In case of a tie (22 occurrences), the most recent year is represented. Former Weather Channel meteorologist Guy Walton maintains a comprehensive records database, analyzing monthly, annual, and decadal records trends.
Source: Climate Central
By Ayurella Horn-Muller, Climate Central This story was produced through a partnership between Climate Central, a non-advocacy science and news group, and WVLT, a CBS-affiliated television station in Knoxville. WVLT meteorologist Ben Cathey contributed local reporting. Click here for the Climate Central report, “POLLEN PROBLEMS: Climate Change, the Growing Season, ...
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