Corrections
Errors found in PlainClimate's figures and claims, each fixed at its source and listed with its date, newest first. The log covers the errors in data and claims found since July 2026; smaller fixes of layout and wording are in the changes log. To report one, write to hello@plainclimate.com with the page and the figure.
First published · revised
Corrections log
- : Boulder, Colorado read a reference station 14 miles west at 9,800 feet, which made Boulder the "coldest large city". Boulder now reads its in-town station (5,484 feet); the mountain station is a row on its page.
- : Cleveland and Cincinnati read secondary airports (Burke Lakefront, Lunken) instead of their official National Weather Service stations (Hopkins, Cincinnati/Northern Kentucky). Both now read the official station; the others are rows on their pages.
- : Alaska was missing from the coldest-states ranking because NOAA's missing-value codes were read as numbers. Alaska (28.0°F) now leads it.
- : The "sunniest cities" ranking measured low cloud seen by airport sensors, which put Denver below Seattle. It now measures the share of clear-sky sunshine reaching the ground (NASA POWER, 2001-2020).
- : Atlanta, Georgia showed the station NOAA labels "ATLANTA" (USW00053819), which is Peachtree City Falcon Field, about 30 miles south of downtown. Atlanta now shows Hartsfield-Jackson International Airport (USW00013874), the city's official climate station; the Falcon Field station has its own page for Peachtree City.
- : The growing season was the gap between the median last and first frost dates (Chicago 195 days). It is now NOAA's own median growing-season length (Chicago 193 days) on every page.
- : Statewide averages were the simple average of each state's stations (Iowa 48.0°F). State pages now show NOAA's area-weighted statewide normal (Iowa 48.3°F).
- : Many cities appeared only under a station's name ("Madison Dane Rgnl", "Rochester Gtr", "Greensboro Wtp"). Each station is now matched to the Census place it stands for; Greensboro now shows Piedmont Triad International Airport, its official station, instead of a water treatment plant's.
- : Place names with accents (Cañon City, Española, Utqiaġvik) were misread from the Census file, so those towns appeared only as station records. They are now places with their own pages, and the search finds them typed with or without accents.
- : Mesa, Arizona, Virginia Beach, Virginia and 68 other places had no page because their station carries another name (East Mesa, Oceana Naval Air Station). A station inside a place of 10,000 or more people now keeps that place's page.
- : The links to NOAA's normals archives had stopped working after NOAA renamed the files. They now point to the current versioned archives.
- : State and national precipitation averages divided by the number of temperature stations instead of precipitation stations. They now use their own count.
- : Some lists still ranked uninhabited sites: Kahoolawe appeared as the city with the steadiest climate and Death Valley National Park led California. Every list now ranks only Census places.
- : Rankings of "cities" ranked weather stations, so Death Valley National Park appeared as the hottest U.S. city. Rankings now rank places.
- : Some charts drew generated climate series rather than NOAA data. They were removed; every chart now draws NOAA's own figures.
- : Pages claimed sunshine data the site did not have, and two pages gave contradictory growing-season figures. The claims were removed and the figures made consistent.
- : The growing-season length was missing for every place because it was never computed. It is now computed from NOAA's frost dates.
- : Some charts showed values that were not from NOAA's files, and the methodology described a check that did not exist. The charts were removed and the methodology corrected.
- : A warming tool claimed a precision of 344 climate divisions that its data did not have. The claim was removed.