National Climate Report - August 2019
Historically Extreme Autumn Temperature and Precipitation Maps

« National Climate Report - August 2019


Historically Extreme Autumn Temperature and Precipitation Maps


Places have unique climate histories. The maps below help depict the local and regional "coldest, warmest, driest and wettest autumns on record".

The first map below shows the local warmest autumn on record across the CONUS, considering average temperature. The five largest footprints, which aren't necessarily the five warmest autumns overall, are depicted in unique colors; all other autumns are combined into an "other" category. The other maps depict the same type of analysis, for: minimum ("overnight low") temperature, maximum ("afternoon high") temperature, driest and wettest precipitation.

Looking at the warmest average temperature map and associated table, it is interesting to note which autumns are represented. The autumn with the largest footprint is 1931, when a quarter of the country, stretching from Texas to New York, had their warmest autumn. However, temperatures west of the Rockies were largely below normal, muting the national-average temperature, which now stands as the 5th warmest autumn for the CONUS, despite having the most area record autumn warmth. Even more dramatically, 1919 is still the warmest autumn on record for much of the Gulf Coast, and commands the fourth-largest footprint of record warmth, yet it was one of the coolest autumns on record nationally. In the Autumn of 2016 (September-November 2016), no areas saw below average temperatures: warmer than normal temperatures stretched across the entire country. Pockets of record warmth padded the overall average as seen in the divisional average temperature ranks map. In 2016, the combination of the expansive warmth and its intensity resulted in the warmest autumn on record.

(click any image to enlarge)

Warmest Average Temperature

Rank by AreaAutumnExtent
Largest193125.0%
2nd196319.5%
3rd201615.3%
4th20175.6%
5th19193.3%
map depicting local warmest TAVG Autumn on record


Warmest Minimum Temperature

Rank by AreaAutumnExtent
Largest201619.2%
2nd193117.3%
3rd196311.5%
4th19989.2%
5th20156.6%
map depicting local warmest TMIN Autumn on record


Warmest Maximum Temperature

Rank by AreaAutumnExtent
Largest196316.7%
2nd193114.8%
3rd201611.3%
4th19876.3%
5th19995.7%
map depicting local warmest TMAX Autumn on record


Coldest Average Temperature

Rank by AreaAutumnExtent
Largest197633.5%
2nd189618.6%
3rd198515.7%
4th19176.8%
5th19163.9%
map depicting local coldest TAVG Autumn on record

Coldest Minimum Temperature

Rank by AreaAutumnExtent
Largest197622.1%
2nd189617.8%
3rd19179.9%
4th18987.9%
5th19857.1%
map depicting local coldest TMIN Autumn on record


Coldest Maximum Temperature

Rank by AreaAutumnExtent
Largest197626.1%
2nd198516.9%
3rd189614.6%
4th19727.3%
5th19174.9%
map depicting local coldest TMAX Autumn on record


Driest Average Precipitation

Rank by AreaAutumnExtent
Largest19526.8%
2nd19765.8%
3rd19565.0%
4th19294.9%
5th19394.5%
map depicting local driest Autumn on record


Wettest Average Precipitation

Rank by AreaAutumnExtent
Largest20186.2%
2nd19415.4%
3rd19735.2%
4th19463.9%
5th19863.3%
map depicting local wettest Autumn on record


Citing This Report

NOAA National Centers for Environmental Information, State of the Climate: National Climate Report for August 2019, published online September 2019, retrieved on September 22, 2019 from https://www.ncdc.noaa.gov/sotc/national/201908/supplemental/page-7.

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