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Data as of 2025-12-31
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Built 2026-10-19 (19 October 2026)

Helmut Mountain Alaska Threshold Days by Year (USR0000AHEL)

6 fixed thresholds counted per year at Helmut Mountain Alaska (USR0000AHEL): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Helmut Mountain Alaska Thresholds

  • Helmut Mountain Alaska: days with a maximum temperature at or below 0 C (32 F) in 12 years, most in 2015 with 220.
  • Helmut Mountain Alaska: nights with a minimum temperature at or below 0 C (32 F) in 12 years, most in 2000 with 257.
  • Helmut Mountain Alaska: nights with a minimum temperature at or below -10 C (14 F) in 12 years, most in 1999 with 200.
  • Helmut Mountain Alaska: nights with a minimum temperature at or below -20 C (-4 F) in 12 years, most in 1990 with 113.
  • 6 fixed thresholds have at least one qualifying day at Helmut Mountain Alaska.
12 years with a qualifying day
Nights at or below 0 C (32 F) per year at Helmut Mountain Alaska Days per year at Helmut Mountain Alaska with nights with a minimum temperature at or below 0 C (32 F), with the decade average as a line. The most was 257 in 2000. 01002003001990: 2531991: 2461994: 2341998: 2361999: 2482000: 2572015: 2512016: 2352017: 2432020: 2352024: 2262025: 220199019941999201520172024
Days per year at Helmut Mountain Alaska with nights with a minimum temperature at or below 0 C (32 F), with the decade average as a line. The most was 257 in 2000.
Nights at or below 0 C (32 F) per year at Helmut Mountain Alaska
YearDaysDecade average
1990253243.4
1991246243.4
1994234243.4
1998236243.4
1999248243.4
2000257257
2015251243
2016235243
2017243243
2020235227
2024226227
2025220227
First to last qualifying date each year at Helmut Mountain Alaska For each year, a bar from the first to the last day at Helmut Mountain Alaska meeting 0 C (32 F). 1990: 1 January 1990 to 31 December 19901991: 1 January 1991 to 31 December 19911994: 1 January 1994 to 31 December 19941998: 1 January 1998 to 31 December 19981999: 1 January 1999 to 30 December 19992000: 1 January 2000 to 28 December 20002015: 1 January 2015 to 31 December 20152016: 1 January 2016 to 31 December 20162017: 1 January 2017 to 31 December 20172020: 1 January 2020 to 31 December 20202024: 1 January 2024 to 31 December 20242025: 1 January 2025 to 31 December 2025199019941999201520172024JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Helmut Mountain Alaska meeting 0 C (32 F).
First to last qualifying date each year at Helmut Mountain Alaska
YearFirst dateLast date
19901990-01-011990-12-31
19911991-01-011991-12-31
19941994-01-011994-12-31
19981998-01-011998-12-31
19991999-01-011999-12-30
20002000-01-012000-12-28
20152015-01-012015-12-31
20162016-01-012016-12-31
20172017-01-012017-12-31
20202020-01-012020-12-31
20242024-01-012024-12-31
20252025-01-012025-12-31

Every Fixed Threshold

Fixed thresholds at Helmut Mountain Alaska
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
0 C (32 F): Ice days (max122202015201
0 C (32 F): Frost days (min122572000220
-10 C (14 F): Days with min122001999145
-20 C (-4 F): Days with min12113199062
-30 C (-22 F): Days with min103819906
-40 C (-40 F): Days with min2119911

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1990.

Download the Data

  • Data for Helmut Mountain Alaska threshold days by year: CSV or JSON. Field meanings are on the data page.

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. (US Government open data (NOAA NCEI)) Data as of 2026-10-17 (17 October 2026). Threshold counts are computed by this site.

Data as of . Last revised (2025-12-31).