{"title":"Helmut Mountain Alaska: threshold days by year","description":"Days at or beyond each fixed threshold at Helmut Mountain Alaska, by year.","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/stations/USR0000AHEL/thresholds/","columns":[{"name":"threshold","description":"Threshold id, for example tmax_ge_40c."},{"name":"year","description":"Calendar year."},{"name":"days","description":"Days in the year at or beyond the threshold."},{"name":"first","description":"First qualifying date of the year."},{"name":"last","description":"Last qualifying date of the year."},{"name":"longest_streak","description":"Longest run of consecutive qualifying days inside the year."}],"rows":[{"threshold":"tmax_le_0c","year":1990,"days":209,"first":"1990-01-01","last":"1990-12-31","longest_streak":30},{"threshold":"tmax_le_0c","year":1991,"days":191,"first":"1991-01-01","last":"1991-12-31","longest_streak":47},{"threshold":"tmax_le_0c","year":1994,"days":190,"first":"1994-01-01","last":"1994-12-31","longest_streak":36},{"threshold":"tmax_le_0c","year":1998,"days":199,"first":"1998-01-01","last":"1998-12-31","longest_streak":44},{"threshold":"tmax_le_0c","year":1999,"days":211,"first":"1999-01-01","last":"1999-12-31","longest_streak":69},{"threshold":"tmax_le_0c","year":2000,"days":211,"first":"2000-01-01","last":"2000-12-28","longest_streak":54},{"threshold":"tmax_le_0c","year":2015,"days":220,"first":"2015-01-01","last":"2015-12-31","longest_streak":92},{"threshold":"tmax_le_0c","year":2016,"days":195,"first":"2016-01-01","last":"2016-12-31","longest_streak":89},{"threshold":"tmax_le_0c","year":2017,"days":207,"first":"2017-01-01","last":"2017-12-31","longest_streak":88},{"threshold":"tmax_le_0c","year":2020,"days":205,"first":"2020-01-01","last":"2020-12-31","longest_streak":72},{"threshold":"tmax_le_0c","year":2024,"days":185,"first":"2024-01-01","last":"2024-12-31","longest_streak":28},{"threshold":"tmax_le_0c","year":2025,"days":201,"first":"2025-01-01","last":"2025-12-31","longest_streak":33},{"threshold":"tmin_le_0c","year":1990,"days":253,"first":"1990-01-01","last":"1990-12-31","longest_streak":54},{"threshold":"tmin_le_0c","year":1991,"days":246,"first":"1991-01-01","last":"1991-12-31","longest_streak":51},{"threshold":"tmin_le_0c","year":1994,"days":234,"first":"1994-01-01","last":"1994-12-31","longest_streak":62},{"threshold":"tmin_le_0c","year":1998,"days":236,"first":"1998-01-01","last":"1998-12-31","longest_streak":56},{"threshold":"tmin_le_0c","year":1999,"days":248,"first":"1999-01-01","last":"1999-12-30","longest_streak":77},{"threshold":"tmin_le_0c","year":2000,"days":257,"first":"2000-01-01","last":"2000-12-28","longest_streak":82},{"threshold":"tmin_le_0c","year":2015,"days":251,"first":"2015-01-01","last":"2015-12-31","longest_streak":91},{"threshold":"tmin_le_0c","year":2016,"days":235,"first":"2016-01-01","last":"2016-12-31","longest_streak":95},{"threshold":"tmin_le_0c","year":2017,"days":243,"first":"2017-01-01","last":"2017-12-31","longest_streak":122},{"threshold":"tmin_le_0c","year":2020,"days":235,"first":"2020-01-01","last":"2020-12-31","longest_streak":73},{"threshold":"tmin_le_0c","year":2024,"days":226,"first":"2024-01-01","last":"2024-12-31","longest_streak":76},{"threshold":"tmin_le_0c","year":2025,"days":220,"first":"2025-01-01","last":"2025-12-31","longest_streak":97},{"threshold":"tmin_le_m10c","year":1990,"days":174,"first":"1990-01-01","last":"1990-12-31","longest_streak":32},{"threshold":"tmin_le_m10c","year":1991,"days":170,"first":"1991-01-01","last":"1991-12-31","longest_streak":24},{"threshold":"tmin_le_m10c","year":1994,"days":159,"first":"1994-01-01","last":"1994-12-31","longest_streak":37},{"threshold":"tmin_le_m10c","year":1998,"days":148,"first":"1998-01-01","last":"1998-12-31","longest_streak":35},{"threshold":"tmin_le_m10c","year":1999,"days":200,"first":"1999-01-01","last":"1999-12-30","longest_streak":70},{"threshold":"tmin_le_m10c","year":2000,"days":171,"first":"2000-01-01","last":"2000-12-28","longest_streak":32},{"threshold":"tmin_le_m10c","year":2015,"days":166,"first":"2015-01-01","last":"2015-12-29","longest_streak":63},{"threshold":"tmin_le_m10c","year":2016,"days":150,"first":"2016-01-02","last":"2016-12-31","longest_streak":24},{"threshold":"tmin_le_m10c","year":2017,"days":171,"first":"2017-01-04","last":"2017-12-31","longest_streak":65},{"threshold":"tmin_le_m10c","year":2020,"days":181,"first":"2020-01-01","last":"2020-12-31","longest_streak":53},{"threshold":"tmin_le_m10c","year":2024,"days":164,"first":"2024-01-01","last":"2024-12-31","longest_streak":28},{"threshold":"tmin_le_m10c","year":2025,"days":145,"first":"2025-01-01","last":"2025-12-31","longest_streak":30},{"threshold":"tmin_le_m20c","year":1990,"days":113,"first":"1990-01-01","last":"1990-12-30","longest_streak":33},{"threshold":"tmin_le_m20c","year":1991,"days":86,"first":"1991-01-07","last":"1991-12-30","longest_streak":17},{"threshold":"tmin_le_m20c","year":1994,"days":101,"first":"1994-01-01","last":"1994-12-27","longest_streak":19},{"threshold":"tmin_le_m20c","year":1998,"days":65,"first":"1998-01-01","last":"1998-12-31","longest_streak":18},{"threshold":"tmin_le_m20c","year":1999,"days":105,"first":"1999-01-01","last":"1999-12-30","longest_streak":15},{"threshold":"tmin_le_m20c","year":2000,"days":50,"first":"2000-01-01","last":"2000-12-17","longest_streak":10},{"threshold":"tmin_le_m20c","year":2015,"days":63,"first":"2015-01-07","last":"2015-12-27","longest_streak":13},{"threshold":"tmin_le_m20c","year":2016,"days":40,"first":"2016-01-12","last":"2016-12-27","longest_streak":8},{"threshold":"tmin_le_m20c","year":2017,"days":68,"first":"2017-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