Omaha, Nebraska 2021-09-13 02:41:32 –
Q: Why is the weather new and normal?
NS: The National Climatic Data Center (or NCDC) of the National Oceanic and Atmospheric Administration calculates average 30-year weather conditions in over 7,500 locations in the United States.
An average reliable estimate requires at least 30 years. The average of these 30 years is called the US normal. These are the bases on which you can compare the current weather of a place with the average weather that the place expects, such as whether the temperature on a particular day is cooler or warmer than normal, or whether a particular month is wetter than normal. Provide a line.
The revised normals are calculated every 10 years to account for climate change over the last 30 years. For the past decade, normals have been based on meteorological observations from 1981 to 2010. In early May, NOAA climate experts published the latest collection based on the weather from 1991 to 2020.
Scientists use the 20th century average (1901-2000) to study long-term climate trends. Comparing the 1991-2020 annual temperature normal with the 20th century average shows that warming is occurring throughout the United States. In the last 30 years, no region has been cooler than the 20th century. The central part of the country, from the Gulf of Mexico to the Great Lakes, was not as warm as the rest of the country, but had 5% to 15% more precipitation than the 20th century average.
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