Daily records
Page built 2026-10-18
Data as of 2026-10-16
Search
Built 2026-10-18 (18 October 2026)

Koyukuk Nwr Alaska Weather Records (USR0000AKOY)

Record envelope, standing records and threshold days for Koyukuk Nwr Alaska (USR0000AKOY), Alaska, United States, with 34 years of record.

Key Facts for Koyukuk Nwr Alaska

  • Koyukuk Nwr Alaska (USR0000AKOY) is a weather station in Alaska, United States at 66.01 latitude and -157.57 longitude, 31 m (100 ft) above sea level.
  • The station reports from 1990 to 2023, 34 years of record.
  • 1,464 records set at Koyukuk Nwr Alaska still stand.
  • Records are tracked for tmax, tmin: an element needs 30 years of data to be eligible.
  • Koyukuk Nwr Alaska set a daily record low minimum temperature of -8.3 C (17.1 F) on 3 October 2026 (provisional).

Provisional Records

Records set in the last 60 days are provisional until they clear the revision window.

About the Station

  • Location: Alaska, United States, 66.01 latitude, -157.57 longitude.
  • Elevation: 31 m (100 ft).
  • Period of record: 1990 to 2023, 34 years.
  • Eligible elements: tmax, tmin.

Daily Record Envelope and 2026

19 days at or beyond a record
Daily record high and record low at Koyukuk Nwr Alaska, with 2026 drawn through them The band shows the record high and record low for each calendar day at Koyukuk Nwr Alaska. The lines show the 2026 daily maximum and minimum. 19 days in 2026 matched or passed a record. Temperatures are in degrees Celsius. -40-2002040 JanFebMarAprMayJunJulAugSepOctNovDec
The band shows the record high and record low for each calendar day at Koyukuk Nwr Alaska. The lines show the 2026 daily maximum and minimum. 19 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Koyukuk Nwr Alaska, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan3.3 C (37.9 F)-38.9 C (-38.0 F)-3.9 C (25.0 F)-33.9 C (-29.0 F)
Feb2.2 C (36.0 F)-38.3 C (-36.9 F)-6.7 C (19.9 F)-33.9 C (-29.0 F)
Mar8.9 C (48.0 F)-33.9 C (-29.0 F)3.9 C (39.0 F)-30.0 C (-22.0 F)
Apr15.0 C (59.0 F)-30.6 C (-23.1 F)8.3 C (46.9 F)-22.2 C (-8.0 F)
May25.6 C (78.1 F)-22.8 C (-9.0 F)15.0 C (59.0 F)-9.4 C (15.1 F)
Jun28.9 C (84.0 F)-6.7 C (19.9 F)23.9 C (75.0 F)-3.9 C (25.0 F)
Jul31.7 C (89.1 F)-1.7 C (28.9 F)25.0 C (77.0 F)0.6 C (33.1 F)
Aug28.3 C (82.9 F)-6.7 C (19.9 F)22.2 C (72.0 F)0.0 C (32.0 F)
Sep20.0 C (68.0 F)-8.9 C (16.0 F)12.8 C (55.0 F)-6.7 C (19.9 F)
Oct21.7 C (71.1 F)-22.8 C (-9.0 F)2.2 C (36.0 F)-9.4 C (15.1 F)
Nov2.2 C (36.0 F)-29.4 C (-20.9 F)n/an/a
Dec2.2 C (36.0 F)-37.2 C (-35.0 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Koyukuk Nwr Alaska by the year they were set 1,464 records at Koyukuk Nwr Alaska still stand. 2002 holds the most, with 94. 02550751001990: 111993: 381994: 551995: 701996: 871997: 551998: 181999: 312000: 412001: 572002: 942003: 522004: 652005: 572006: 502007: 552008: 462009: 342010: 372011: 302012: 422013: 572014: 352015: 152016: 272017: 472018: 232019: 442020: 292021: 432022: 92023: 252024: 302025: 372026: 18199019962000200420082012201620202024
1,464 records at Koyukuk Nwr Alaska still stand. 2002 holds the most, with 94.
Standing records at Koyukuk Nwr Alaska by the year they were set
Year setStanding records
199011
199338
199455
199570
199687
199755
199818
199931
200041
200157
200294
200352
200465
200557
200650
200755
200846
200934
201037
201130
201242
201357
201435
201515
201627
201747
201823
201944
202029
202143
20229
202325
202430
202537
202618

Period of Record Coverage

1990 to 2026
Days with data per year at Koyukuk Nwr Alaska 35 years of record at Koyukuk Nwr Alaska, 1990 to 2026. 11 years have data for under 90 percent of days and are left out of rankings: 1990, 1993, 1994, 1998, 1999, 2000, 2014, 2015 and others. 1990: 71 of 365 days1993: 196 of 365 days1994: 221 of 365 days1995: 355 of 365 days1996: 361 of 366 days1997: 362 of 365 days1998: 219 of 365 days1999: 202 of 365 days2000: 252 of 366 days2001: 346 of 365 days2002: 353 of 365 days2003: 344 of 365 days2004: 334 of 366 days2005: 351 of 365 days2006: 340 of 365 days2007: 336 of 365 days2008: 351 of 366 days2009: 337 of 365 days2010: 346 of 365 days2011: 344 of 365 days2012: 340 of 366 days2013: 358 of 365 days2014: 246 of 365 days2015: 148 of 365 days2016: 232 of 366 days2017: 353 of 365 days2018: 339 of 365 days2019: 348 of 365 days2020: 357 of 366 days2021: 350 of 365 days2022: 341 of 365 days2023: 326 of 365 days2024: 338 of 366 days2025: 333 of 365 days2026: 283 of 365 days19901995200020052010201520202025
35 years of record at Koyukuk Nwr Alaska, 1990 to 2026. 11 years have data for under 90 percent of days and are left out of rankings: 1990, 1993, 1994, 1998, 1999, 2000, 2014, 2015 and others.
Days with data per year at Koyukuk Nwr Alaska
YearDays with dataShare of yearComplete
19907119%No
199319654%No
199422161%No
199535597%Yes
199636199%Yes
199736299%Yes
199821960%No
199920255%No
200025269%No
200134695%Yes
200235397%Yes
200334494%Yes
200433491%Yes
200535196%Yes
200634093%Yes
200733692%Yes
200835196%Yes
200933792%Yes
201034695%Yes
201134494%Yes
201234093%Yes
201335898%Yes
201424667%No
201514841%No
201623263%No
201735397%Yes
201833993%Yes
201934895%Yes
202035798%Yes
202135096%Yes
202234193%Yes
202332689%No
202433892%Yes
202533391%Yes
202628378%No

Latest Records

20
Latest records at Koyukuk Nwr Alaska
DateStationRecordValueBeat old record byOld record stoodSignificance
3 October 2026Koyukuk Nwr Alaska, USdaily low min (Provisional)-8.3 C (17.1 F)0.5 C (0.9 F)17 years8 of 100 (Routine)
2 October 2026Koyukuk Nwr Alaska, USdaily low max (Provisional)-1.7 C (28.9 F)1.1 C (2.0 F)32 years14 of 100 (Routine)
1 October 2026Koyukuk Nwr Alaska, USdaily low max (Provisional)-4.4 C (24.1 F)2.7 C (4.9 F)25 years15 of 100 (Routine)
1 October 2026Koyukuk Nwr Alaska, USdaily low min (Provisional)-9.4 C (15.1 F)2.2 C (4.0 F)4 years8 of 100 (Routine)
30 September 2026Koyukuk Nwr Alaska, USmonthly low max (Provisional)-3.9 C (25.0 F)0.6 C (1.1 F)22 years20 of 100 (Routine)
30 September 2026Koyukuk Nwr Alaska, USdaily low min (Tie, Provisional)-6.7 C (19.9 F)tie24 years2 of 100 (Routine)
29 September 2026Koyukuk Nwr Alaska, USdaily low max (Tie, Provisional)-2.8 C (27.0 F)tie21 years2 of 100 (Routine)
27 September 2026Koyukuk Nwr Alaska, USdaily high max (Tie, Provisional)11.1 C (52.0 F)tie5 years1 of 100 (Routine)
3 September 2026Koyukuk Nwr Alaska, USdaily low max (Provisional)4.4 C (39.9 F)0.6 C (1.1 F)32 years13 of 100 (Routine)
2 September 2026Koyukuk Nwr Alaska, USdaily low max (Provisional)3.9 C (39.0 F)0.5 C (0.9 F)12 years7 of 100 (Routine)
2 September 2026Koyukuk Nwr Alaska, USdaily low min (Provisional)-2.2 C (28.0 F)0.5 C (0.9 F)12 years7 of 100 (Routine)
1 September 2026Koyukuk Nwr Alaska, USdaily low min (Provisional)-1.1 C (30.0 F)1.7 C (3.1 F)20 years13 of 100 (Routine)
1 September 2026Koyukuk Nwr Alaska, USdaily low max (Provisional)4.4 C (39.9 F)2.3 C (4.1 F)8 years9 of 100 (Routine)
25 August 2026Koyukuk Nwr Alaska, USdaily low max (Provisional)6.7 C (44.1 F)1.1 C (2.0 F)29 years13 of 100 (Routine)
13 July 2026Koyukuk Nwr Alaska, USdaily low max8.9 C (48.0 F)1.7 C (3.1 F)28 years14 of 100 (Routine)
9 June 2026Koyukuk Nwr Alaska, USdaily low min-3.9 C (25.0 F)2.2 C (4.0 F)17 years13 of 100 (Routine)
8 June 2026Koyukuk Nwr Alaska, USdaily low max5.0 C (41.0 F)1.7 C (3.1 F)17 years11 of 100 (Routine)
5 June 2026Koyukuk Nwr Alaska, USdaily low min-2.8 C (27.0 F)1.7 C (3.1 F)31 years15 of 100 (Routine)
15 May 2026Koyukuk Nwr Alaska, USdaily high min (Tie)7.8 C (46.0 F)tie32 years3 of 100 (Routine)
6 May 2026Koyukuk Nwr Alaska, USdaily low max (Tie)-5.0 C (23.0 F)tie24 years2 of 100 (Routine)

Climate Trend

15 complete years, 1995 to 2022
Annual mean temperature at Koyukuk Nwr Alaska as warming stripes, 1995 to 2022 One stripe for each of 15 complete years at Koyukuk Nwr Alaska, 1995 to 2022. Blue stripes are years cooler than the station's own mean of -2.9 C (26.9 F); red stripes are warmer. The coolest year was 1996, at -4.5 C (23.9 F), and the warmest was 2019, at -0.7 C (30.8 F). The strongest colour marks a difference of 2.2 C (4.0 F). 1995: -2.6 C, +0.3 C from the station mean1996: -4.5 C, -1.7 C from the station mean1997: -2.5 C, +0.4 C from the station mean2001: -3.2 C, -0.4 C from the station mean2002: -1.9 C, +1.0 C from the station mean2003: -2.8 C, 0.0 C from the station mean2005: -2.5 C, +0.3 C from the station mean2008: -4.4 C, -1.6 C from the station mean2011: -3.3 C, -0.4 C from the station mean2013: -3.3 C, -0.5 C from the station mean2017: -1.4 C, +1.5 C from the station mean2019: -0.7 C, +2.2 C from the station mean2020: -3.1 C, -0.2 C from the station mean2021: -4.1 C, -1.3 C from the station mean2022: -2.5 C, +0.4 C from the station mean199520002005201020152020
One stripe for each of 15 complete years at Koyukuk Nwr Alaska, 1995 to 2022. Blue stripes are years cooler than the station's own mean of -2.9 C (26.9 F); red stripes are warmer. The coolest year was 1996, at -4.5 C (23.9 F), and the warmest was 2019, at -0.7 C (30.8 F). The strongest colour marks a difference of 2.2 C (4.0 F).
Annual mean temperature at Koyukuk Nwr Alaska as warming stripes, 1995 to 2022
YearAnnual mean temperatureDifference from the station mean
1995-2.6 C+0.26 C
1996-4.5 C-1.66 C
1997-2.5 C+0.40 C
2001-3.2 C-0.39 C
2002-1.9 C+0.97 C
2003-2.8 C+0.05 C
2005-2.5 C+0.34 C
2008-4.4 C-1.55 C
2011-3.3 C-0.41 C
2013-3.3 C-0.49 C
2017-1.4 C+1.49 C
2019-0.7 C+2.18 C
2020-3.1 C-0.21 C
2021-4.1 C-1.28 C
2022-2.5 C+0.36 C

This station does not have enough complete years (30 are needed) to fit a temperature trend.

A year is complete when all 12 months have at least 20 days of both daily maximum and daily minimum readings. The annual mean is the mean of the monthly means. The trend describes this one station over this period; it does not say what caused the change.

Extremes by Year

1990 to 2026
Yearly extremes at Koyukuk Nwr Alaska: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)31.7 C (89.1 F)201926.7 C (80.1 F)35
Coldest night (TNn)-38.9 C (-38.0 F)1997-33.9 C (-29.0 F)35

Hottest day (TXx)

Hottest day (TXx) at Koyukuk Nwr Alaska by year The hottest day of the year at Koyukuk Nwr Alaska, 1990 to 2026. The record is 31.7 C (89.1 F) in 2019, marked on the chart; the median year is 26.7 C (80.1 F). 22.52527.53032.51990200020102020Record: 31.7 C (89.1 F) in 2019
The hottest day of the year at Koyukuk Nwr Alaska, 1990 to 2026. The record is 31.7 C (89.1 F) in 2019, marked on the chart; the median year is 26.7 C (80.1 F).
Hottest day (TXx) at Koyukuk Nwr Alaska by year
YearHottest day (TXx)
199028.3 C (82.9 F)
199327.2 C (81.0 F)
199426.1 C (79.0 F)
199526.1 C (79.0 F)
199623.9 C (75.0 F)
199726.1 C (79.0 F)
199825.0 C (77.0 F)
199928.3 C (82.9 F)
200025.6 C (78.1 F)
200124.4 C (75.9 F)
200226.7 C (80.1 F)
200325.6 C (78.1 F)
200428.3 C (82.9 F)
200527.2 C (81.0 F)
200623.3 C (73.9 F)
200727.8 C (82.0 F)
200826.7 C (80.1 F)
200928.3 C (82.9 F)
201026.1 C (79.0 F)
201125.6 C (78.1 F)
201222.8 C (73.0 F)
201328.9 C (84.0 F)
201427.8 C (82.0 F)
201527.8 C (82.0 F)
201630.0 C (86.0 F)
201728.3 C (82.9 F)
201825.0 C (77.0 F)
201931.7 C (89.1 F)
202025.0 C (77.0 F)
202127.2 C (81.0 F)
202225.6 C (78.1 F)
202329.4 C (84.9 F)
202428.3 C (82.9 F)
202530.6 C (87.1 F)
202625.0 C (77.0 F)

Coldest night (TNn)

Coldest night (TNn) at Koyukuk Nwr Alaska by year The coldest night of the year at Koyukuk Nwr Alaska, 1990 to 2026. The record is -38.9 C (-38.0 F) in 1997, marked on the chart; the median year is -33.9 C (-29.0 F). -40-30-20-1001990200020102020Record: -38.9 C (-38.0 F) in 1997
The coldest night of the year at Koyukuk Nwr Alaska, 1990 to 2026. The record is -38.9 C (-38.0 F) in 1997, marked on the chart; the median year is -33.9 C (-29.0 F).
Coldest night (TNn) at Koyukuk Nwr Alaska by year
YearColdest night (TNn)
1990-2.8 C (27.0 F)
1993-25.6 C (-14.1 F)
1994-35.6 C (-32.1 F)
1995-37.2 C (-35.0 F)
1996-32.8 C (-27.0 F)
1997-38.9 C (-38.0 F)
1998-30.6 C (-23.1 F)
1999-33.9 C (-29.0 F)
2000-29.4 C (-20.9 F)
2001-27.8 C (-18.0 F)
2002-37.2 C (-35.0 F)
2003-35.6 C (-32.1 F)
2004-33.9 C (-29.0 F)
2005-32.2 C (-26.0 F)
2006-37.2 C (-35.0 F)
2007-34.4 C (-29.9 F)
2008-35.0 C (-31.0 F)
2009-34.4 C (-29.9 F)
2010-32.8 C (-27.0 F)
2011-37.2 C (-35.0 F)
2012-38.3 C (-36.9 F)
2013-28.9 C (-20.0 F)
2014-29.4 C (-20.9 F)
2015-16.1 C (3.0 F)
2016-28.3 C (-18.9 F)
2017-37.2 C (-35.0 F)
2018-35.6 C (-32.1 F)
2019-31.7 C (-25.1 F)
2020-35.0 C (-31.0 F)
2021-30.6 C (-23.1 F)
2022-31.1 C (-24.0 F)
2023-32.2 C (-26.0 F)
2024-35.6 C (-32.1 F)
2025-28.9 C (-20.0 F)
2026-33.9 C (-29.0 F)

Each chart shows one value per year; the dot marks the record year. TXx is the hottest daily maximum, TNn the coldest daily minimum, Rx1day and Rx5day the largest one-day and five-day rain totals, and CDD the longest run of days with less than 1 mm of rain. A year with missing days can understate an extreme.

Download the Data

  • Data for Koyukuk Nwr Alaska standing records by year: CSV or JSON. Field meanings are on the data page.
  • 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 2026-10-16 (16 October 2026). Records are computed by this site and are not official.

Data as of . Last revised (2026-10-16).