{"title":"Helm Alaska: threshold days by year","description":"Days at or beyond each fixed threshold at Helm 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/USR0000AHLM/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_ge_30c","year":2015,"days":5,"first":"2015-06-15","last":"2015-07-09","longest_streak":3},{"threshold":"tmax_ge_30c","year":2016,"days":1,"first":"2016-07-18","last":"2016-07-18","longest_streak":1},{"threshold":"tmax_ge_30c","year":2017,"days":4,"first":"2017-08-04","last":"2017-09-05","longest_streak":2},{"threshold":"tmax_ge_30c","year":2018,"days":15,"first":"2018-06-18","last":"2018-08-05","longest_streak":9},{"threshold":"tmax_ge_30c","year":2019,"days":8,"first":"2019-05-26","last":"2019-08-13","longest_streak":2},{"threshold":"tmax_ge_30c","year":2020,"days":2,"first":"2020-07-30","last":"2020-07-31","longest_streak":2},{"threshold":"tmax_ge_30c","year":2021,"days":5,"first":"2021-06-26","last":"2021-07-30","longest_streak":3},{"threshold":"tmax_ge_30c","year":2022,"days":10,"first":"2022-06-16","last":"2022-08-24","longest_streak":3},{"threshold":"tmax_ge_30c","year":2023,"days":11,"first":"2023-05-16","last":"2023-08-28","longest_streak":2},{"threshold":"tmax_ge_30c","year":2024,"days":8,"first":"2024-07-08","last":"2024-08-18","longest_streak":6},{"threshold":"tmax_ge_30c","year":2025,"days":7,"first":"2025-06-21","last":"2025-09-02","longest_streak":3},{"threshold":"tmax_ge_35c","year":2018,"days":1,"first":"2018-06-19","last":"2018-06-19","longest_streak":1},{"threshold":"tmax_ge_35c","year":2020,"days":1,"first":"2020-07-31","last":"2020-07-31","longest_streak":1},{"threshold":"tmax_ge_35c","year":2021,"days":2,"first":"2021-06-27","last":"2021-06-28","longest_streak":2},{"threshold":"tmax_ge_35c","year":2024,"days":1,"first":"2024-08-18","last":"2024-08-18","longest_streak":1},{"threshold":"tmax_ge_90f","year":2015,"days":1,"first":"2015-07-06","last":"2015-07-06","longest_streak":1},{"threshold":"tmax_ge_90f","year":2016,"days":1,"first":"2016-07-18","last":"2016-07-18","longest_streak":1},{"threshold":"tmax_ge_90f","year":2017,"days":2,"first":"2017-08-05","last":"2017-09-05","longest_streak":1},{"threshold":"tmax_ge_90f","year":2018,"days":3,"first":"2018-06-18","last":"2018-07-31","longest_streak":2},{"threshold":"tmax_ge_90f","year":2019,"days":2,"first":"2019-06-27","last":"2019-07-05","longest_streak":1},{"threshold":"tmax_ge_90f","year":2020,"days":1,"first":"2020-07-31","last":"2020-07-31","longest_streak":1},{"threshold":"tmax_ge_90f","year":2021,"days":4,"first":"2021-06-26","last":"2021-07-30","longest_streak":3},{"threshold":"tmax_ge_90f","year":2022,"days":3,"first":"2022-06-27","last":"2022-08-24","longest_streak":1},{"threshold":"tmax_ge_90f","year":2023,"days":2,"first":"2023-05-17","last":"2023-07-07","longest_streak":1},{"threshold":"tmax_ge_90f","year":2024,"days":5,"first":"2024-08-05","last":"2024-08-18","longest_streak":4},{"threshold":"tmax_ge_90f","year":2025,"days":1,"first":"2025-07-21","last":"2025-07-21","longest_streak":1},{"threshold":"tmax_le_0c","year":2011,"days":15,"first":"2011-01-11","last":"2011-12-14","longest_streak":5},{"threshold":"tmax_le_0c","year":2015,"days":3,"first":"2015-12-23","last":"2015-12-28","longest_streak":2},{"threshold":"tmax_le_0c","year":2016,"days":12,"first":"2016-12-04","last":"2016-12-25","longest_streak":5},{"threshold":"tmax_le_0c","year":2017,"days":18,"first":"2017-01-05","last":"2017-12-31","longest_streak":6},{"threshold":"tmax_le_0c","year":2018,"days":11,"first":"2018-01-10","last":"2018-12-21","longest_streak":3},{"threshold":"tmax_le_0c","year":2019,"days":11,"first":"2019-01-03","last":"2019-11-30","longest_streak":3},{"threshold":"tmax_le_0c","year":2020,"days":12,"first":"2020-01-02","last":"2020-02-03","longest_streak":5},{"threshold":"tmax_le_0c","year":2021,"days":32,"first":"2021-01-21","last":"2021-12-31","longest_streak":21},{"threshold":"tmax_le_0c","year":2022,"days":20,"first":"2022-01-04","last":"2022-12-23","longest_streak":7},{"threshold":"tmax_le_0c","year":2023,"days":4,"first":"2023-01-30","last":"2023-02-24","longest_streak":3},{"threshold":"tmax_le_0c","year":2024,"days":15,"first":"2024-01-07","last":"2024-12-16","longest_streak":7},{"threshold":"tmax_le_0c","year":2025,"days":18,"first":"2025-01-04","last":"2025-12-27","longest_streak":10},{"threshold":"tmin_le_0c","year":2011,"days":102,"first":"2011-01-01","last":"2011-12-15","longest_streak":29},{"threshold":"tmin_le_0c","year":2015,"days":49,"first":"2015-01-04","last":"2015-12-31","longest_streak":17},{"threshold":"tmin_le_0c","year":2016,"days":55,"first":"2016-01-01","last":"2016-12-31","longest_streak":24},{"threshold":"tmin_le_0c","year":2017,"days":99,"first":"2017-01-01","last":"2017-12-31","longest_streak":25},{"threshold":"tmin_le_0c","year":2018,"days":97,"first":"2018-01-01","last":"2018-12-31","longest_streak":39},{"threshold":"tmin_le_0c","year":2019,"days":87,"first":"2019-01-02","last":"2019-12-27","longest_streak":40},{"threshold":"tmin_le_0c","year":2020,"days":116,"first":"2020-01-01","last":"2020-12-31","longest_streak":24},{"threshold":"tmin_le_0c","year":2021,"days":114,"first":"2021-01-05","last":"2021-12-31","longest_streak":39},{"threshold":"tmin_le_0c","year":2022,"days":102,"first":"2022-01-01","last":"2022-12-31","longest_streak":17},{"threshold":"tmin_le_0c","year":2023,"days":86,"first":"2023-01-08","last":"2023-12-27","longest_streak":33},{"threshold":"tmin_le_0c","year":2024,"days":80,"first":"2024-01-06","last":"2024-12-30","longest_streak":17},{"threshold":"tmin_le_0c","year":2025,"days":78,"first":"2025-01-01","last":"2025-12-31","longest_streak":24},{"threshold":"tmin_le_m10c","year":2011,"days":6,"first":"2011-01-13","last":"2011-03-01","longest_streak":2},{"threshold":"tmin_le_m10c","year":2017,"days":2,"first":"2017-12-29","last":"2017-12-30","longest_streak":2},{"threshold":"tmin_le_m10c","year":2019,"days":4,"first":"2019-02-02","last":"2019-02-17","longest_streak":3},{"threshold":"tmin_le_m10c","year":2020,"days":5,"first":"2020-01-12","last":"2020-01-16","longest_streak":5},{"threshold":"tmin_le_m10c","year":2021,"days":6,"first":"2021-02-09","last":"2021-12-27","longest_streak":4},{"threshold":"tmin_le_m10c","year":2022,"days":10,"first":"2022-01-04","last":"2022-12-21","longest_streak":4},{"threshold":"tmin_le_m10c","year":2023,"days":1,"first":"2023-02-23","last":"2023-02-23","longest_streak":1},{"threshold":"tmin_le_m10c","year":2024,"days":6,"first":"2024-01-10","last":"2024-03-05","longest_streak":4},{"threshold":"tmin_le_m10c","year":2025,"days":7,"first":"2025-02-01","last":"2025-12-27","longest_streak":3}]}