It's getting hot: climate norms have officially changed in the United States
New climate norms released by the National Oceanic and Atmospheric Administration (NOAA) on Tuesday May 4 show that the weather in the United States is getting warmer. CNN.
The current rate dataset, which represents average temperature, humidity, and rainfall from 1991 to 2020, highlights that much of the country warmed from rates from 1981 to 2010, with the exception of the north-central United States. The West is getting drier and the East is getting wetter.
NOAA publishes climatic norms every 10 years, and they reflect data from the last 30 years.
Fairbanks, Alaska, which is generally considered a colder place compared to the rest of the country, is now classified as a warm summer continental climate in the Köppen climate classification.
Average temperatures in May in Fairbanks rose above 50 ° F (10 ° C), causing the climate to change from subarctic.
According to the World Meteorological Organization, "The Arctic is one of the fastest warming regions in the world and is warming at twice the global average."
In warm summer continental climates, the average temperature should be at least 50 ° F (10 ° C) for four months, the average temperature should be below 71,6 ° F (21,6 ° C) during all months, and the coldest month the average temperature must be below zero (-17,7 ° C).
In the northeast, heatwaves are often referred to as high temperatures reaching at least 90 ° F (32,2 ° C) for three or more days in a row.
Washington DC now averages 22 consecutive days of 90 ° F (32,2 ° C). In the previous norms from the 1981-2010 dataset. The maximum temperature in the US capital reached 89 ° F (31,6 ° C) for 16 days, but never averaged 90 to 90 ° F.
Other cities in the Northeast are also warming up. Average high temperatures in New York and Boston increased slightly in the summer, and the short-term 15-year average is even higher than the baseline 30-year average.
A window of three decades of observation is considered long enough to compensate for any changes that are expected from year to year. However, with so many extreme weather events in recent years exacerbated by human-induced climate change, a short-term average has been added for the first time to represent a period close to today.
Despite rising temperatures in New York City, average snowfall has increased by almost half a foot (over 15 cm). Annual rainfall in New York has also increased overall.
Atlanta has an average of 20 highs over 90 ° F during the summer in Atlanta, which is a 15-year average from the new baseline average.
One of the cities with more significant annual temperature changes is Chicago. At the new average, the temperature increased by more than 1 degree.
The average temperature in Salt Lake City has also risen sharply by 1 degree, and the 15-year average shows an even higher average temperature to reflect more recent weather.
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In Los Angeles, the average maximum temperature has decreased and the minimum has increased slightly, reducing daily fluctuations. Warmer nights can make periods of hot weather more dangerous because the body cannot cool down as effectively.
The decrease in rainfall is most noticeable in Los Angeles. In winter, which is usually the wettest season for Southern California, the city saw a slight increase in rainfall from 1991 to 2020 compared to 1981 to 2010, but the earlier average was more than 2 inches (over 5 cm) less. than new.
This is also seen in other parts of the West, including San Francisco and Phoenix. Drier and generally warmer weather contributes to longer wildfire seasons.
You can find out how the climate in your city has changed. at this link.
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