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Data as of 2026-10-12
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Built 2026-10-18 (18 October 2026)

Cooper Lake Weather Records (USS0049L10S)

Record envelope, standing records and threshold days for Cooper Lake (USS0049L10S), Alaska, United States, with 44 years of record.

Key Facts for Cooper Lake

  • Cooper Lake (USS0049L10S) is a weather station in Alaska, United States at 60.39 latitude and -149.69 longitude, 366 m (1,200 ft) above sea level.
  • The station reports from 1983 to 2026, 44 years of record.
  • 1,464 records set at Cooper Lake still stand.
  • Records are tracked for prcp: an element needs 30 years of data to be eligible.
  • Cooper Lake set a daily record precipitation of 15.2 mm (0.6 in) on 20 July 2026.

About the Station

  • Location: Alaska, United States, 60.39 latitude, -149.69 longitude.
  • Elevation: 366 m (1,200 ft).
  • Period of record: 1983 to 2026, 44 years.
  • Eligible elements: prcp.

Daily Record Envelope and 2026

21 days at or beyond a record
Daily record high and record low at Cooper Lake, with 2026 drawn through them The band shows the record high and record low for each calendar day at Cooper Lake. The lines show the 2026 daily maximum and minimum. 21 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 Cooper Lake. The lines show the 2026 daily maximum and minimum. 21 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Cooper Lake, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan13.2 C (55.8 F)-36.9 C (-34.4 F)4.4 C (39.9 F)-26.7 C (-16.1 F)
Feb9.4 C (48.9 F)-30.0 C (-22.0 F)6.1 C (43.0 F)-23.3 C (-9.9 F)
Mar15.3 C (59.5 F)-28.7 C (-19.7 F)3.9 C (39.0 F)-23.3 C (-9.9 F)
Apr18.6 C (65.5 F)-26.1 C (-15.0 F)8.3 C (46.9 F)-9.4 C (15.1 F)
May24.6 C (76.3 F)-10.4 C (13.3 F)12.8 C (55.0 F)-1.7 C (28.9 F)
Jun30.0 C (86.0 F)-7.4 C (18.7 F)24.4 C (75.9 F)2.8 C (37.0 F)
Jul30.4 C (86.7 F)-3.5 C (25.7 F)25.0 C (77.0 F)2.2 C (36.0 F)
Aug30.3 C (86.5 F)-7.5 C (18.5 F)25.0 C (77.0 F)4.4 C (39.9 F)
Sep21.3 C (70.3 F)-13.9 C (7.0 F)18.9 C (66.0 F)0.0 C (32.0 F)
Oct13.4 C (56.1 F)-21.6 C (-6.9 F)7.8 C (46.0 F)-3.3 C (26.1 F)
Nov11.1 C (52.0 F)-27.1 C (-16.8 F)n/an/a
Dec7.6 C (45.7 F)-35.0 C (-31.0 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Cooper Lake by the year they were set 1,464 records at Cooper Lake still stand. 1999 holds the most, with 238. 01002003001997: 251998: 331999: 2382000: 2072001: 242002: 472003: 532004: 522005: 282006: 192007: 372008: 232009: 512010: 262011: 212012: 392013: 462014: 552015: 542016: 402017: 342018: 272019: 842020: 242021: 352022: 232023: 202024: 242025: 392026: 361997200020032006200920122015201820212024
1,464 records at Cooper Lake still stand. 1999 holds the most, with 238.
Standing records at Cooper Lake by the year they were set
Year setStanding records
199725
199833
1999238
2000207
200124
200247
200353
200452
200528
200619
200737
200823
200951
201026
201121
201239
201346
201455
201554
201640
201734
201827
201984
202024
202135
202223
202320
202424
202539
202636

Wettest Day of Each Month

Feb: 147.3 mm (5.8 in)
Record daily precipitation for each month at Cooper Lake The wettest day on record for each calendar month at Cooper Lake. The most was 147.3 mm (5.8 in) on 4 February 2003. 050100150 Jan: 91.4 mm (3.6 in), 12 January 1984 Jan Feb: 147.3 mm (5.8 in), 4 February 2003 Feb Mar: 58.4 mm (2.3 in), 11 March 2014 Mar Apr: 45.7 mm (1.8 in), 19 April 2015 Apr May: 40.6 mm (1.6 in), 10 May 2019 May Jun: 68.6 mm (2.7 in), 18 June 2018 Jun Jul: 40.6 mm (1.6 in), 19 July 2026 Jul Aug: 91.4 mm (3.6 in), 25 August 1989 Aug Sep: 114.3 mm (4.5 in), 20 September 1995 Sep Oct: 114.3 mm (4.5 in), 30 October 2021 Oct Nov: 63.5 mm (2.5 in), 20 November 1984 Nov Dec: 83.8 mm (3.3 in), 21 December 1999 Dec
The wettest day on record for each calendar month at Cooper Lake. The most was 147.3 mm (5.8 in) on 4 February 2003.
Record daily precipitation for each month at Cooper Lake
MonthRecord daily precipitation (mm)Date
Jan91.4 mm (3.6 in)12 January 1984
Feb147.3 mm (5.8 in)4 February 2003
Mar58.4 mm (2.3 in)11 March 2014
Apr45.7 mm (1.8 in)19 April 2015
May40.6 mm (1.6 in)10 May 2019
Jun68.6 mm (2.7 in)18 June 2018
Jul40.6 mm (1.6 in)19 July 2026
Aug91.4 mm (3.6 in)25 August 1989
Sep114.3 mm (4.5 in)20 September 1995
Oct114.3 mm (4.5 in)30 October 2021
Nov63.5 mm (2.5 in)20 November 1984
Dec83.8 mm (3.3 in)21 December 1999

Period of Record Coverage

1997 to 2026
Days with data per year at Cooper Lake 30 years of record at Cooper Lake, 1997 to 2026. 12 years have data for under 90 percent of days and are left out of rankings: 1997, 1999, 2000, 2001, 2002, 2003, 2004, 2005 and others. 1997: 165 of 365 days1998: 362 of 365 days1999: 290 of 365 days2000: 272 of 366 days2001: 244 of 365 days2002: 206 of 365 days2003: 309 of 365 days2004: 258 of 366 days2005: 204 of 365 days2006: 193 of 365 days2007: 317 of 365 days2008: 366 of 366 days2009: 365 of 365 days2010: 359 of 365 days2011: 365 of 365 days2012: 366 of 366 days2013: 365 of 365 days2014: 364 of 365 days2015: 360 of 365 days2016: 366 of 366 days2017: 365 of 365 days2018: 365 of 365 days2019: 365 of 365 days2020: 366 of 366 days2021: 364 of 365 days2022: 364 of 365 days2023: 364 of 365 days2024: 272 of 366 days2025: 363 of 365 days2026: 281 of 365 days200020052010201520202025
30 years of record at Cooper Lake, 1997 to 2026. 12 years have data for under 90 percent of days and are left out of rankings: 1997, 1999, 2000, 2001, 2002, 2003, 2004, 2005 and others.
Days with data per year at Cooper Lake
YearDays with dataShare of yearComplete
199716545%No
199836299%Yes
199929079%No
200027274%No
200124467%No
200220656%No
200330985%No
200425870%No
200520456%No
200619353%No
200731787%No
2008366100%Yes
2009365100%Yes
201035998%Yes
2011365100%Yes
2012366100%Yes
2013365100%Yes
2014364100%Yes
201536099%Yes
2016366100%Yes
2017365100%Yes
2018365100%Yes
2019365100%Yes
2020366100%Yes
2021364100%Yes
2022364100%Yes
2023364100%Yes
202427274%No
202536399%Yes
202628177%No

Latest Records

20
Latest records at Cooper Lake
DateStationRecordValueBeat old record byOld record stoodSignificance
20 July 2026Cooper Lake, USdaily rain15.2 mm (0.6 in)7.6 mm (0.30 in)16 years20 of 100 (Routine)
19 July 2026Cooper Lake, USmonthly rain40.6 mm (1.6 in)5.0 mm (0.20 in)3 years24 of 100 (Routine)
14 July 2026Cooper Lake, USdaily rain (Tie)10.2 mm (0.4 in)tie8 years1 of 100 (Routine)
12 July 2026Cooper Lake, USdaily rain7.6 mm (0.30 in)2.5 mm (0.10 in)41 years20 of 100 (Routine)
6 May 2026Cooper Lake, USdaily rain (Tie)5.1 mm (0.20 in)tie29 years3 of 100 (Routine)
1 May 2026Cooper Lake, USdaily rain12.7 mm (0.5 in)5.1 mm (0.20 in)24 years20 of 100 (Routine)
3 February 2026Cooper Lake, USdaily rain33.0 mm (1.3 in)17.8 mm (0.7 in)31 years30 of 100 (Routine)
8 June 2025Cooper Lake, USdaily rain (Tie)5.1 mm (0.20 in)tie40 years4 of 100 (Routine)
3 June 2025Cooper Lake, USdaily rain25.4 mm (1.0 in)10.2 mm (0.4 in)40 years32 of 100 (Routine)
16 April 2025Cooper Lake, USdaily rain25.4 mm (1.0 in)10.2 mm (0.4 in)36 years32 of 100 (Routine)
8 April 2025Cooper Lake, USdaily rain10.2 mm (0.4 in)2.6 mm (0.10 in)40 years20 of 100 (Routine)
19 January 2025Cooper Lake, USdaily rain17.8 mm (0.7 in)2.6 mm (0.10 in)24 years13 of 100 (Routine)
6 January 2025Cooper Lake, USdaily rain35.6 mm (1.4 in)17.8 mm (0.7 in)4 years24 of 100 (Routine)
10 August 2024Cooper Lake, USdaily rain20.3 mm (0.8 in)10.1 mm (0.4 in)3 years17 of 100 (Routine)
3 May 2024Cooper Lake, USdaily rain (Tie)7.6 mm (0.30 in)tie26 years2 of 100 (Routine)
1 April 2024Cooper Lake, USdaily rain33.0 mm (1.3 in)20.3 mm (0.8 in)31 years48 of 100 (Notable)
31 March 2024Cooper Lake, USdaily rain (Tie)5.1 mm (0.20 in)tie36 years3 of 100 (Routine)
22 February 2024Cooper Lake, USdaily rain25.4 mm (1.0 in)7.6 mm (0.30 in)8 years13 of 100 (Routine)
20 February 2024Cooper Lake, USdaily rain43.2 mm (1.7 in)28.0 mm (1.1 in)8 years33 of 100 (Routine)
24 November 2023Cooper Lake, USdaily rain27.9 mm (1.1 in)12.7 mm (0.5 in)32 years25 of 100 (Routine)

Climate Trend

19 complete years, 1998 to 2025
Annual mean temperature at Cooper Lake as warming stripes, 1998 to 2025 One stripe for each of 19 complete years at Cooper Lake, 1998 to 2025. Blue stripes are years cooler than the station's own mean of 2.6 C (36.7 F); red stripes are warmer. The coolest year was 2012, at 0.6 C (33.1 F), and the warmest was 2016, at 4.5 C (40.0 F). The strongest colour marks a difference of 2.1 C (3.8 F). 1998: 3.2 C, +0.6 C from the station mean2003: 3.6 C, +1.0 C from the station mean2008: 0.9 C, -1.8 C from the station mean2009: 2.1 C, -0.5 C from the station mean2010: 2.3 C, -0.3 C from the station mean2011: 1.5 C, -1.1 C from the station mean2012: 0.6 C, -2.0 C from the station mean2013: 2.6 C, 0.0 C from the station mean2014: 3.8 C, +1.2 C from the station mean2015: 3.4 C, +0.8 C from the station mean2016: 4.5 C, +1.8 C from the station mean2017: 2.1 C, -0.5 C from the station mean2018: 3.2 C, +0.6 C from the station mean2019: 4.4 C, +1.8 C from the station mean2020: 1.9 C, -0.7 C from the station mean2021: 1.2 C, -1.4 C from the station mean2022: 3.0 C, +0.4 C from the station mean2023: 2.2 C, -0.4 C from the station mean2025: 3.3 C, +0.7 C from the station mean1998200020052010201520202025
One stripe for each of 19 complete years at Cooper Lake, 1998 to 2025. Blue stripes are years cooler than the station's own mean of 2.6 C (36.7 F); red stripes are warmer. The coolest year was 2012, at 0.6 C (33.1 F), and the warmest was 2016, at 4.5 C (40.0 F). The strongest colour marks a difference of 2.1 C (3.8 F).
Annual mean temperature at Cooper Lake as warming stripes, 1998 to 2025
YearAnnual mean temperatureDifference from the station mean
19983.2 C+0.57 C
20033.6 C+0.96 C
20080.9 C-1.76 C
20092.1 C-0.51 C
20102.3 C-0.32 C
20111.5 C-1.13 C
20120.6 C-2.01 C
20132.6 C-0.04 C
20143.8 C+1.20 C
20153.4 C+0.81 C
20164.5 C+1.84 C
20172.1 C-0.52 C
20183.2 C+0.56 C
20194.4 C+1.83 C
20201.9 C-0.74 C
20211.2 C-1.40 C
20223.0 C+0.38 C
20232.2 C-0.37 C
20253.3 C+0.67 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

1983 to 2026
Yearly extremes at Cooper Lake: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)30.4 C (86.7 F)201926.5 C (79.7 F)30
Coldest night (TNn)-36.9 C (-34.4 F)2000-22.1 C (-7.9 F)30
Wettest day (Rx1day)147.3 mm (5.8 in)200361.0 mm (2.4 in)44
Wettest five days (Rx5day)243.7 mm (9.6 in)2018114.3 mm (4.5 in)44
Longest dry spell (CDD)52 days201421 days44

Hottest day (TXx)

Hottest day (TXx) at Cooper Lake by year The hottest day of the year at Cooper Lake, 1983 to 2026. The record is 30.4 C (86.7 F) in 2019, marked on the chart; the median year is 26.5 C (79.7 F). 15202530351990200020102020Record: 30.4 C (86.7 F) in 2019
The hottest day of the year at Cooper Lake, 1983 to 2026. The record is 30.4 C (86.7 F) in 2019, marked on the chart; the median year is 26.5 C (79.7 F).
Hottest day (TXx) at Cooper Lake by year
YearHottest day (TXx)
1983n/a
1984n/a
1985n/a
1986n/a
1987n/a
1988n/a
1989n/a
1990n/a
1991n/a
1992n/a
1993n/a
1994n/a
1995n/a
1996n/a
199728.0 C (82.4 F)
199827.0 C (80.6 F)
199926.3 C (79.3 F)
200019.4 C (66.9 F)
200127.4 C (81.3 F)
200228.3 C (82.9 F)
200327.9 C (82.2 F)
200430.3 C (86.5 F)
200525.9 C (78.6 F)
200623.8 C (74.8 F)
200727.7 C (81.9 F)
200821.3 C (70.3 F)
200928.3 C (82.9 F)
201022.4 C (72.3 F)
201124.0 C (75.2 F)
201225.8 C (78.4 F)
201330.0 C (86.0 F)
201425.5 C (77.9 F)
201529.2 C (84.6 F)
201627.4 C (81.3 F)
201725.9 C (78.6 F)
201827.3 C (81.1 F)
201930.4 C (86.7 F)
202026.7 C (80.1 F)
202127.8 C (82.0 F)
202226.1 C (79.0 F)
202324.4 C (75.9 F)
202425.0 C (77.0 F)
202525.6 C (78.1 F)
202625.0 C (77.0 F)

Coldest night (TNn)

Coldest night (TNn) at Cooper Lake by year The coldest night of the year at Cooper Lake, 1983 to 2026. The record is -36.9 C (-34.4 F) in 2000, marked on the chart; the median year is -22.1 C (-7.9 F). -40-35-30-25-20-151990200020102020Record: -36.9 C (-34.4 F) in 2000
The coldest night of the year at Cooper Lake, 1983 to 2026. The record is -36.9 C (-34.4 F) in 2000, marked on the chart; the median year is -22.1 C (-7.9 F).
Coldest night (TNn) at Cooper Lake by year
YearColdest night (TNn)
1983n/a
1984n/a
1985n/a
1986n/a
1987n/a
1988n/a
1989n/a
1990n/a
1991n/a
1992n/a
1993n/a
1994n/a
1995n/a
1996n/a
1997-20.0 C (-4.0 F)
1998-20.0 C (-4.0 F)
1999-35.0 C (-31.0 F)
2000-36.9 C (-34.4 F)
2001-22.5 C (-8.5 F)
2002-20.4 C (-4.7 F)
2003-19.9 C (-3.8 F)
2004-23.7 C (-10.7 F)
2005-21.2 C (-6.2 F)
2006-23.8 C (-10.8 F)
2007-21.4 C (-6.5 F)
2008-23.9 C (-11.0 F)
2009-26.4 C (-15.5 F)
2010-20.3 C (-4.5 F)
2011-23.3 C (-9.9 F)
2012-26.2 C (-15.2 F)
2013-24.0 C (-11.2 F)
2014-18.4 C (-1.1 F)
2015-18.9 C (-2.0 F)
2016-19.4 C (-2.9 F)
2017-22.1 C (-7.8 F)
2018-18.7 C (-1.7 F)
2019-20.0 C (-4.0 F)
2020-23.3 C (-9.9 F)
2021-23.9 C (-11.0 F)
2022-22.2 C (-8.0 F)
2023-18.3 C (-0.9 F)
2024-24.4 C (-11.9 F)
2025-20.6 C (-5.1 F)
2026-26.7 C (-16.1 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at Cooper Lake by year The wettest day of the year at Cooper Lake, 1983 to 2026. The record is 147.3 mm (5.8 in) in 2003, marked on the chart; the median year is 61.0 mm (2.4 in). 0501001501990200020102020Record: 147.3 mm (5.8 in) in 2003
The wettest day of the year at Cooper Lake, 1983 to 2026. The record is 147.3 mm (5.8 in) in 2003, marked on the chart; the median year is 61.0 mm (2.4 in).
Wettest day (Rx1day) at Cooper Lake by year
YearWettest day (Rx1day)
198335.6 mm (1.4 in)
198491.4 mm (3.6 in)
198583.8 mm (3.3 in)
1986106.7 mm (4.2 in)
198753.3 mm (2.1 in)
198848.3 mm (1.9 in)
198991.4 mm (3.6 in)
199035.6 mm (1.4 in)
199150.8 mm (2.0 in)
199255.9 mm (2.2 in)
199353.3 mm (2.1 in)
199435.6 mm (1.4 in)
1995114.3 mm (4.5 in)
199630.5 mm (1.2 in)
199743.2 mm (1.7 in)
199853.3 mm (2.1 in)
199983.8 mm (3.3 in)
200035.6 mm (1.4 in)
200161.0 mm (2.4 in)
200263.5 mm (2.5 in)
2003147.3 mm (5.8 in)
200463.5 mm (2.5 in)
200563.5 mm (2.5 in)
200673.7 mm (2.9 in)
200748.3 mm (1.9 in)
200888.9 mm (3.5 in)
200966.0 mm (2.6 in)
201083.8 mm (3.3 in)
201173.7 mm (2.9 in)
201283.8 mm (3.3 in)
201383.8 mm (3.3 in)
201463.5 mm (2.5 in)
201553.3 mm (2.1 in)
201681.3 mm (3.2 in)
201745.7 mm (1.8 in)
201891.4 mm (3.6 in)
201953.3 mm (2.1 in)
202061.0 mm (2.4 in)
2021114.3 mm (4.5 in)
202243.2 mm (1.7 in)
202345.7 mm (1.8 in)
202443.2 mm (1.7 in)
202555.9 mm (2.2 in)
202640.6 mm (1.6 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Cooper Lake by year The wettest five days of the year at Cooper Lake, 1983 to 2026. The record is 243.7 mm (9.6 in) in 2018, marked on the chart; the median year is 114.3 mm (4.5 in). 501001502002501990200020102020Record: 243.7 mm (9.6 in) in 2018
The wettest five days of the year at Cooper Lake, 1983 to 2026. The record is 243.7 mm (9.6 in) in 2018, marked on the chart; the median year is 114.3 mm (4.5 in).
Wettest five days (Rx5day) at Cooper Lake by year
YearWettest five days (Rx5day)
198356.0 mm (2.2 in)
1984147.3 mm (5.8 in)
1985142.2 mm (5.6 in)
1986231.1 mm (9.1 in)
1987111.8 mm (4.4 in)
1988104.2 mm (4.1 in)
1989152.4 mm (6.0 in)
199086.4 mm (3.4 in)
1991114.2 mm (4.5 in)
199293.9 mm (3.7 in)
199383.8 mm (3.3 in)
199466.1 mm (2.6 in)
1995198.0 mm (7.8 in)
199666.1 mm (2.6 in)
1997127.0 mm (5.0 in)
199883.9 mm (3.3 in)
1999152.3 mm (6.0 in)
2000109.2 mm (4.3 in)
2001101.6 mm (4.0 in)
2002193.1 mm (7.6 in)
2003177.8 mm (7.0 in)
2004124.4 mm (4.9 in)
200596.5 mm (3.8 in)
2006127.0 mm (5.0 in)
2007139.8 mm (5.5 in)
2008157.5 mm (6.2 in)
2009116.8 mm (4.6 in)
2010238.8 mm (9.4 in)
2011114.3 mm (4.5 in)
2012193.1 mm (7.6 in)
2013111.7 mm (4.4 in)
2014104.2 mm (4.1 in)
2015111.7 mm (4.4 in)
2016127.0 mm (5.0 in)
201776.2 mm (3.0 in)
2018243.7 mm (9.6 in)
2019104.1 mm (4.1 in)
2020175.3 mm (6.9 in)
2021210.8 mm (8.3 in)
202278.7 mm (3.1 in)
202381.3 mm (3.2 in)
202488.9 mm (3.5 in)
2025121.9 mm (4.8 in)
202678.7 mm (3.1 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Cooper Lake by year The longest dry spell of the year at Cooper Lake, 1983 to 2026. The record is 52 days in 2014, marked on the chart; the median year is 21 days. 1020304050601990200020102020Record: 52 days in 2014
The longest dry spell of the year at Cooper Lake, 1983 to 2026. The record is 52 days in 2014, marked on the chart; the median year is 21 days.
Longest dry spell (CDD) at Cooper Lake by year
YearLongest dry spell (CDD)
198317 days
198421 days
198516 days
198626 days
198718 days
198812 days
198920 days
199021 days
199116 days
199224 days
199321 days
199420 days
199528 days
199627 days
199715 days
199819 days
199920 days
200029 days
200126 days
200236 days
200320 days
200431 days
200517 days
200622 days
200722 days
200815 days
200917 days
201021 days
201126 days
201218 days
201335 days
201452 days
201524 days
201614 days
201752 days
201830 days
201938 days
202028 days
202123 days
202252 days
202315 days
202420 days
202524 days
202619 days

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.

Rainfall Return Levels

42 years, 1984 to 2025

A day with at least 62.5 mm (2.5 in) of rain is expected about once in 2 years. A day with at least 151.0 mm (5.9 in) of rain is expected about once in 100 years.

Rainfall return levels at Cooper Lake: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years62.5 mm (2.5 in)
5 years85.0 mm (3.3 in)
10 years100.3 mm (3.9 in)
25 years120.3 mm (4.7 in)
50 years135.5 mm (5.3 in)Longer than the 42 years of record
100 years151.0 mm (5.9 in)Longer than the 42 years of record

The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 42 years of values from 1984 to 2025.

A return level is an estimate. It is least reliable for the long periods, 50 and 100 years, and for any period longer than the record behind the fit, where the fit has to reach past the largest day actually observed. It is not a forecast.

The largest wettest-day totals in the fit: 147.3 mm (5.8 in) in 2003; 114.3 mm (4.5 in) in 1995; 114.3 mm (4.5 in) in 2021.

Download the Data

  • Data for Cooper Lake standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Cooper Lake 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 (2026-10-12).