All-time weather records — Koyukuk, AK

Record high
90.0°F
July 8, 2009
Record low
-65.0°F
January 29, 2012
Wettest day
1.90 in
April 20, 2020

Climate change signal in Koyukuk

23.2%

of Koyukuk's all-time daily heat records were set in the last decade (85 of 366 records since 2015).

17.8%

of all-time daily cold records were set in the last decade (65 of 366 records since 2015).

If records were spread evenly across the station's history, you'd expect roughly 5% per decade. Decade-by-decade, here's where each record-breaking day was set:

Decade Heat records set # Cold records set #
1990s
44
88
2000s
218
172
2010s
64
49
2020s
40
57

Records are the all-time daily extremes that are still standing — each daily record can only be held by one year. The station's earliest hot record was set in 1996, the latest in 2025. Period of observation: 1996-2026.

Records by month

Month Hottest day Coldest day Wettest day
January 42.1°F — Jan 17, 2009 -65.0°F — Jan 29, 2012 0.51 in — Jan 2, 2005
February 39.0°F — Feb 14, 2006 -63.9°F — Feb 2, 1999 0.91 in — Feb 22, 2022
March 48.0°F — Mar 19, 1998 -44.0°F — Mar 30, 2004 0.60 in — Mar 27, 2023
April 64.0°F — Apr 27, 2005 -27.9°F — Apr 9, 2021 1.90 in — Apr 20, 2020
May 84.9°F — May 25, 2002 -7.1°F — May 3, 2001 0.49 in — May 26, 1999
June 87.1°F — Jun 28, 2004 25.0°F — Jun 3, 2006 1.36 in — Jun 27, 2025
July 90.0°F — Jul 8, 2009 33.1°F — Jul 4, 2002 1.42 in — Jul 18, 2016
August 86.0°F — Aug 18, 2004 28.0°F — Aug 18, 1997 1.06 in — Aug 16, 2024
September 73.0°F — Sep 6, 2009 12.0°F — Sep 28, 2010 1.42 in — Sep 14, 2017
October 59.0°F — Oct 1, 2003 -31.0°F — Oct 26, 1996 0.78 in — Oct 27, 2019
November 39.9°F — Nov 7, 2020 -42.0°F — Nov 18, 2011 0.70 in — Nov 14, 2020
December 42.1°F — Dec 31, 2015 -54.9°F — Dec 30, 1999 0.90 in — Dec 13, 2011

Click a month to see every daily record for that month in Koyukuk.