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Published spring/fall MM/DD strings convert to leap-calendar ordinals internally and back to calendar dates for display. Special missing codes remain null; raw values and completeness flags are retained. Archived losslessly as gzip; uncompressedSha256 identifies extracted content.","uncompressedSha256":"c22b923e7f3120ed557ff6d3ee6db1f4fb5b6faa0d39e73480c8f6cfcd1a33c9"},{"file":"noaa-freeze-documentation.pdf","url":"https://www.ncei.noaa.gov/data/normals-annualseasonal/1991-2020/doc/Normals_ANN_Documentation_1991-2020.pdf","retrieved":"2026-10-02","sha256":"5fd15ef9f513969dc360150341dfc99e43d6ffcc79ea544cd929376d9e125d15","downloadSha256":"5fd15ef9f513969dc360150341dfc99e43d6ffcc79ea544cd929376d9e125d15","selection":"Unchanged annual/seasonal variable and flag documentation."}],"notes":["Published 1991–2020 NOAA station normals, not a forecast or a guarantee for an individual garden. Spring dates express probability of the last threshold occurrence on that date or later; fall dates express probability of the first occurrence on that date or earlier. Growing-season length expresses the probability of at least that many days and is independently published: it is not computed by subtracting the two date quantiles. Published MM/DD calendar dates are preserved; leap-year ordinals are only an internal plotting coordinate. Local terrain and distance from a station matter. Special no-freeze, year-round risk and missing values are unavailable rather than fabricated dates."],"geographyLabel":"NOAA weather-station locations","loadedState":"DE"}