The present normals information set, which characterize the common temperature, precipitation and rainfall for 1991 by way of 2020, spotlight that a lot of the nation has warmed in comparison with normals for 1981 by way of 2010, apart from the north-central US. The West is changing into drier and the East is popping wetter.
“The Arctic is among the fastest warming regions in the world and is heating at twice the global average,” in accordance with the World Meteorological Organization.
In the Northeast, a heatwave is commonly acknowledged as excessive temperatures measuring not less than 90 levels for 3 or extra consecutive days.
Washington, DC, now averages 22 days of 90 levels in a row. In the earlier normals from the 1981-2010 information set, DC’s excessive temperature peaked at 89 levels for 16 days however by no means averaged at 90 levels.
Other Northeast cities are additionally heating up. New York City and Boston’s common excessive temperature in the summertime have barely risen, and the short-term, 15-year common is even larger than the baseline, 30-year common.
The window of three a long time of observations is taken into account lengthy sufficient to offset any variations you’ll anticipate from one yr to the following. However, with so many climate extremes lately, enhanced by human-caused climate change, the short-term common was added for the primary time to characterize a interval nearer to at present.
Despite the rising temperatures in New York City, the common snowfall elevated by practically half a foot. Annual precipitation in New York has additionally elevated total.
In Atlanta, the city averages 20 extra 90+ diploma highs in the summertime, utilizing the 15-year common in comparison with the new baseline common.
One city with a bigger change in annual temperatures is Chicago. The temperature rose by greater than 1 diploma with the new common.
Salt Lake City’s common temperature has additionally risen dramatically — by 1 diploma, and the 15-year common reveals a good hotter common temperature to replicate more moderen climate.
In a city like Los Angeles, the common excessive temperature has really cooled whereas lows have barely warmed, lowering the day by day temperature variation. These hotter nights could make intervals of hotter climate extra harmful as a result of your physique cannot cool as effectively.
Most notably in Los Angeles is the lower in precipitation. In the winter, which is usually the moist time of the yr for Southern California, the city really had a slight enhance in precipitation from 1991 to 2020 in comparison with 1981 to 2010, however the short-term common is greater than 2 inches lower than the new common. This reveals how in more moderen instances, rainfall has decreased within the city.