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Built 2026-10-19 (19 October 2026)

Koyukuk Nwr Alaska Threshold Days by Year (USR0000AKOY)

7 fixed thresholds counted per year at Koyukuk Nwr Alaska (USR0000AKOY): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Koyukuk Nwr Alaska Thresholds

  • Koyukuk Nwr Alaska: days with a maximum temperature at or below 0 C (32 F) in 25 years, most in 2001 with 198.
  • Koyukuk Nwr Alaska: nights with a minimum temperature at or below 0 C (32 F) in 25 years, most in 1996 with 245.
  • Koyukuk Nwr Alaska: nights with a minimum temperature at or below -10 C (14 F) in 25 years, most in 2008 with 162.
  • Koyukuk Nwr Alaska: nights with a minimum temperature at or below -20 C (-4 F) in 25 years, most in 2021 with 83.
  • 7 fixed thresholds have at least one qualifying day at Koyukuk Nwr Alaska.
25 years with a qualifying day
Nights at or below 0 C (32 F) per year at Koyukuk Nwr Alaska Days per year at Koyukuk Nwr Alaska with nights with a minimum temperature at or below 0 C (32 F), with the decade average as a line. The most was 245 in 1996. 01002003001995: 2001996: 2451997: 2092001: 2192002: 2272003: 2262004: 1992005: 2032006: 2062007: 1992008: 2142009: 2062010: 2132011: 2062012: 2312013: 2372017: 2072018: 1822019: 2062020: 2042021: 2202022: 2002024: 2042025: 2032026: 149199520012004200720102013201920222026
Days per year at Koyukuk Nwr Alaska with nights with a minimum temperature at or below 0 C (32 F), with the decade average as a line. The most was 245 in 1996.
Nights at or below 0 C (32 F) per year at Koyukuk Nwr Alaska
YearDaysDecade average
1995200218
1996245218
1997209218
2001219211
2002227211
2003226211
2004199211
2005203211
2006206211
2007199211
2008214211
2009206211
2010213211.7
2011206211.7
2012231211.7
2013237211.7
2017207211.7
2018182211.7
2019206211.7
2020204196.7
2021220196.7
2022200196.7
2024204196.7
2025203196.7
2026149196.7
First to last qualifying date each year at Koyukuk Nwr Alaska For each year, a bar from the first to the last day at Koyukuk Nwr Alaska meeting 0 C (32 F). 1995: 3 January 1995 to 31 December 19951996: 1 January 1996 to 31 December 19961997: 1 January 1997 to 31 December 19972001: 1 January 2001 to 31 December 20012002: 1 January 2002 to 31 December 20022003: 1 January 2003 to 28 December 20032004: 1 January 2004 to 6 December 20042005: 2 January 2005 to 31 December 20052006: 1 January 2006 to 11 December 20062007: 1 January 2007 to 31 December 20072008: 2 January 2008 to 31 December 20082009: 1 January 2009 to 31 December 20092010: 1 January 2010 to 31 December 20102011: 1 January 2011 to 31 December 20112012: 1 January 2012 to 31 December 20122013: 1 January 2013 to 31 December 20132017: 1 January 2017 to 31 December 20172018: 1 January 2018 to 31 December 20182019: 2 January 2019 to 31 December 20192020: 1 January 2020 to 31 December 20202021: 3 January 2021 to 31 December 20212022: 1 January 2022 to 29 December 20222024: 1 January 2024 to 18 December 20242025: 2 January 2025 to 31 December 20252026: 1 January 2026 to 11 October 20261995200220062010201720212026JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Koyukuk Nwr Alaska meeting 0 C (32 F).
First to last qualifying date each year at Koyukuk Nwr Alaska
YearFirst dateLast date
19951995-01-031995-12-31
19961996-01-011996-12-31
19971997-01-011997-12-31
20012001-01-012001-12-31
20022002-01-012002-12-31
20032003-01-012003-12-28
20042004-01-012004-12-06
20052005-01-022005-12-31
20062006-01-012006-12-11
20072007-01-012007-12-31
20082008-01-022008-12-31
20092009-01-012009-12-31
20102010-01-012010-12-31
20112011-01-012011-12-31
20122012-01-012012-12-31
20132013-01-012013-12-31
20172017-01-012017-12-31
20182018-01-012018-12-31
20192019-01-022019-12-31
20202020-01-012020-12-31
20212021-01-032021-12-31
20222022-01-012022-12-29
20242024-01-012024-12-18
20252025-01-022025-12-31
20262026-01-012026-10-11

Every Fixed Threshold

Fixed thresholds at Koyukuk Nwr Alaska
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days2220191
0 C (32 F): Ice days (max251982001120
0 C (32 F): Frost days (min252451996149
-10 C (14 F): Days with min25162200891
-20 C (-4 F): Days with min2583202155
-30 C (-22 F): Days with min2230201214
20 C (68 F): Tropical nights (min3220041

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 2019.

Download the Data

  • Data for Koyukuk Nwr 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 (2026-10-17).