National Climate Report - Autumn (SON) 2000

U.S. Autumn Temp 1900-2000

Contents of This Report:


Top of Page National Temperature - September - November

U.S. Autumn Temperature
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Autumn, September-November 2000, mean temperature averaged across the contiguous United States, based on data from the U.S. Historical Climate Network (USHCN) and preliminary data from the Climate Division Database, ranked as the 29th coolest autumn season since national records began in 1895. The preliminary nationally averaged temperature for the season was 53.6° F, 1.0° F below the long-term mean. The prior two autumn seasons had been much above the long-term mean. The actual autumn season temperature values from 1895 through 2000 are available.

The map to the right, based on approximately 250 airport stations, shows departures from the 1961-1990 normal temperatures for September-November 2000. In general, the central and western Great Lakes, Tennessee Valley, New England and areas of the central Plains were warmer than normal. The northern Plains, northern Rockies, Pacific coast, portions of the South, and areas along the Atlantic coast were cooler than normal. Alaska was warmer than normal and Hawaii was near normal. U.S. Autumn Temperature Departures
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Top of Page National Precipitation - September-November

U.S. Autumn Precipitation, 1895-2000
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Based upon preliminary data, autumn 2000 ranked near the long-term mean for precipitation. Six of the last nine autumn seasons have averaged above the long-term mean for precipitation.
The preliminary national standardized precipitation index ranked autumn 2000 as the 35th wettest such season since national records began in 1895. U.S. Autumn Precipitation Index, 1895-2000
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The map to the right, based on approximately 250 airport stations, shows autumn 2000 total precipitation as a departure from 1961-1990 station normals. Above-normal precipitation can be found in portions of southeast Alaska, while most of the other Alaskan stations were near normal. The Alaskan panhandle was drier than normal. The Hawaiian stations averaged considerably drier than normal. On the mainland U.S., stations were predominantly wetter than normal in the northern Plains and northern Rockies and portions of Arizona and New Mexico. Stations were predominantly drier than normal for the rest of the country. U.S. Autumn Precipitation Departures
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Current data are based on preliminary reports from River Forecast Center stations and First and Second Order airport stations obtained from the National Weather Service (NWS) Climate Prediction Center and real time Global Telecommunications System (GTS) monthly CLIMAT summaries. THE CURRENT DATA SHOULD BE USED WITH CAUTION. These preliminary data are useful for estimating how current anomalies compare to the historical record, however the actual values and rankings for the current year may change as the final data arrive at NCDC and are processed.

The following NCDC datasets are used for the historical U.S. data: the climate division drought database (TD-9640), and the hurricane datasets (TD-9636 and TD-9697). It should be noted that the climate division drought database consists of monthly data for 344 climate divisions in the contiguous United States. These divisional values are calculated from the 6000+ station Cooperative Observer network.

Citing This Report

NOAA National Centers for Environmental Information, State of the Climate: National Climate Report for Autumn (SON) 2000, published online December 2000, retrieved on January 18, 2018 from