{"title":"Records on 1909-05-21","description":"Every record set or tied on 1909-05-21.","dataAsOf":"2026-10-17T00:00:00Z","lastRevised":"2026-10-18","source":"Source: NOAA National Centers for Environmental Information, Global Historical Climatology Network Daily (GHCN-Daily). Records are computed by World Extreme Weather Monitor and are not official NOAA products.","licence":"US Government open data (NOAA NCEI)","page":"https://worldextremeweathermonitor.com/records/1909-05-21/","columns":[{"name":"id","description":"Stable record id: station, date, type and timescale."},{"name":"station_id","description":"GHCN-Daily station id."},{"name":"station_name","description":"Station name."},{"name":"country","description":"ISO 3166 alpha-2 country code."},{"name":"type","description":"Record type: tmax_high, tmax_low, tmin_high, tmin_low, prcp_high, snow_high or snwd_high."},{"name":"timescale","description":"daily, monthly or all-time."},{"name":"date","description":"Date the record was set, YYYY-MM-DD."},{"name":"value","description":"Record value in degrees Celsius or millimetres."},{"name":"unit","description":"c for degrees Celsius, mm for millimetres."},{"name":"previous_value","description":"The record it replaced, in the same unit. Empty for a first record."},{"name":"previous_date","description":"Date of the replaced record."},{"name":"margin","description":"How far the new value beat the old record, a non negative magnitude in the same unit. Zero for a tie."},{"name":"years_stood","description":"Whole years the replaced record had stood."},{"name":"significance","description":"Record Significance Score from 0 to 100 (see /methodology/)."},{"name":"tie","description":"True when the value tied the record."},{"name":"provisional","description":"True while the record is inside the 60 day provisional window."},{"name":"lat","description":"Station latitude in decimal degrees."},{"name":"lon","description":"Station longitude in decimal degrees."}],"rows":[{"id":"USW00093725-1909-05-21-prcp_high-daily","station_id":"USW00093725","station_name":"Washington","country":"US","type":"prcp_high","timescale":"daily","date":"1909-05-21","value":45.5,"unit":"mm","previous_value":25.1,"previous_date":"1883-05-21","margin":20.4,"years_stood":25,"significance":31,"tie":false,"provisional":false,"lat":38.9053,"lon":-77.0525},{"id":"UK000047811-1909-05-21-tmin_high-monthly","station_id":"UK000047811","station_name":"Armagh","country":"GB","type":"tmin_high","timescale":"monthly","date":"1909-05-21","value":13.6,"unit":"c","previous_value":13.1,"previous_date":"1864-05-17","margin":0.5,"years_stood":45,"significance":30,"tie":false,"provisional":false,"lat":54.35,"lon":-6.65},{"id":"BE000006447-1909-05-21-tmax_high-daily","station_id":"BE000006447","station_name":"Uccle","country":"BE","type":"tmax_high","timescale":"daily","date":"1909-05-21","value":28.1,"unit":"c","previous_value":27.3,"previous_date":"1857-05-21","margin":0.8,"years_stood":51,"significance":23,"tie":false,"provisional":false,"lat":50.8,"lon":4.35},{"id":"USW00013777-1909-05-21-prcp_high-daily","station_id":"USW00013777","station_name":"Baltimore Customs House","country":"US","type":"prcp_high","timescale":"daily","date":"1909-05-21","value":52.1,"unit":"mm","previous_value":37.3,"previous_date":"1894-05-21","margin":14.8,"years_stood":14,"significance":22,"tie":false,"provisional":false,"lat":39.2833,"lon":-76.6167},{"id":"EI000003969-1909-05-21-tmin_high-daily","station_id":"EI000003969","station_name":"Dublin Phoenix Park","country":"IE","type":"tmin_high","timescale":"daily","date":"1909-05-21","value":13.3,"unit":"c","previous_value":11,"previous_date":"1883-05-21","margin":2.3,"years_stood":25,"significance":18,"tie":false,"provisional":false,"lat":53.3639,"lon":-6.3192},{"id":"SF001988360-1909-05-21-prcp_high-daily","station_id":"SF001988360","station_name":"Philipstown (Tnk)","country":"ZA","type":"prcp_high","timescale":"daily","date":"1909-05-21","value":6.4,"unit":"mm","previous_value":0,"previous_date":"1878-05-21","margin":6.4,"years_stood":30,"significance":18,"tie":false,"provisional":false,"lat":-30.43,"lon":24.47},{"id":"USW00024274-1909-05-21-tmin_low-daily","station_id":"USW00024274","station_name":"Portland Rfc City","country":"US","type":"tmin_low","timescale":"daily","date":"1909-05-21","value":2.8,"unit":"c","previous_value":3.9,"previous_date":"1876-05-21","margin":1.1,"years_stood":32,"significance":16,"tie":false,"provisional":false,"lat":45.5333,"lon":-122.6667},{"id":"SF000624440-1909-05-21-prcp_high-daily","station_id":"SF000624440","station_name":"Piketberg (Pol)","country":"ZA","type":"prcp_high","timescale":"daily","date":"1909-05-21","value":20.3,"unit":"mm","previous_value":13.2,"previous_date":"1891-05-21","margin":7.1,"years_stood":17,"significance":15,"tie":false,"provisional":false,"lat":-32.92,"lon":18.77},{"id":"CA006116254-1909-05-21-prcp_high-daily","station_id":"CA006116254","station_name":"Parry Sound","country":"CA","type":"prcp_high","timescale":"daily","date":"1909-05-21","value":12.2,"unit":"mm","previous_value":11.2,"previous_date":"1877-05-21","margin":1,"years_stood":31,"significance":13,"tie":false,"provisional":false,"lat":45.3333,"lon":-80},{"id":"UK000003026-1909-05-21-tmax_high-daily","station_id":"UK000003026","station_name":"Stornoway Airport","country":"GB","type":"tmax_high","timescale":"daily","date":"1909-05-21","value":17.8,"unit":"c","previous_value":17.2,"previous_date":"1882-05-21","margin":0.6,"years_stood":26,"significance":13,"tie":false,"provisional":false,"lat":58.33,"lon":-6.32},{"id":"CA008101170-1909-05-21-tmin_low-daily","station_id":"CA008101170","station_name":"Dalhousie","country":"CA","type":"tmin_low","timescale":"daily","date":"1909-05-21","value":-1.7,"unit":"c","previous_value":-0.6,"previous_date":"1896-05-21","margin":1.1,"years_stood":12,"significance":9,"tie":false,"provisional":false,"lat":48.0667,"lon":-66.3667},{"id":"USC00456109-1909-05-21-tmin_low-monthly","station_id":"USC00456109","station_name":"Olympia Priest Pt Park","country":"US","type":"tmin_low","timescale":"monthly","date":"1909-05-21","value":-1.1,"unit":"c","previous_value":-1.1,"previous_date":"1882-05-13","margin":0,"years_stood":27,"significance":5,"tie":true,"provisional":false,"lat":47.0667,"lon":-122.8833},{"id":"DA000027080-1909-05-21-tmin_low-daily","station_id":"DA000027080","station_name":"Tranebjerg","country":"DK","type":"tmin_low","timescale":"daily","date":"1909-05-21","value":2.6,"unit":"c","previous_value":2.6,"previous_date":"1894-05-21","margin":0,"years_stood":14,"significance":1,"tie":true,"provisional":false,"lat":55.85,"lon":10.6}]}