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Mt. Ryan Weather Records (USS0046Q01S)

Record envelope, standing records and threshold days for Mt. Ryan (USS0046Q01S), Alaska, United States, with 46 years of record.

Key Facts for Mt. Ryan

  • Mt. Ryan (USS0046Q01S) is a weather station in Alaska, United States at 65.25 latitude and -146.15 longitude, 853 m (2,800 ft) above sea level.
  • The station reports from 1981 to 2026, 46 years of record.
  • 1,464 records set at Mt. Ryan still stand.
  • Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
  • Mt. Ryan set a daily record low maximum temperature of -5.6 C (21.9 F) on 2 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, 65.25 latitude, -146.15 longitude.
  • Elevation: 853 m (2,800 ft).
  • Period of record: 1981 to 2026, 46 years.
  • Eligible elements: tmax, tmin, prcp.

Daily Record Envelope and 2026

11 days at or beyond a record
Daily record high and record low at Mt. Ryan, with 2026 drawn through them The band shows the record high and record low for each calendar day at Mt. Ryan. The lines show the 2026 daily maximum and minimum. 11 days in 2026 matched or passed a record. Temperatures are in degrees Celsius. -60-40-2002040 JanFebMarAprMayJunJulAugSepOctNovDec
The band shows the record high and record low for each calendar day at Mt. Ryan. The lines show the 2026 daily maximum and minimum. 11 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Mt. Ryan, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan8.6 C (47.5 F)-43.0 C (-45.4 F)1.1 C (34.0 F)-34.4 C (-29.9 F)
Feb9.8 C (49.6 F)-40.0 C (-40.0 F)-4.4 C (24.1 F)-33.3 C (-27.9 F)
Mar10.0 C (50.0 F)-36.0 C (-32.8 F)-3.3 C (26.1 F)-33.3 C (-27.9 F)
Apr20.2 C (68.4 F)-28.3 C (-18.9 F)10.0 C (50.0 F)-17.8 C (0.0 F)
May25.7 C (78.3 F)-15.0 C (5.0 F)12.2 C (54.0 F)-4.4 C (24.1 F)
Jun32.0 C (89.6 F)-5.4 C (22.3 F)22.8 C (73.0 F)-0.6 C (30.9 F)
Jul28.8 C (83.8 F)0.0 C (32.0 F)25.0 C (77.0 F)2.2 C (36.0 F)
Aug30.0 C (86.0 F)-7.0 C (19.4 F)24.4 C (75.9 F)0.6 C (33.1 F)
Sep22.0 C (71.6 F)-15.0 C (5.0 F)15.6 C (60.1 F)-5.6 C (21.9 F)
Oct20.7 C (69.3 F)-27.0 C (-16.6 F)6.7 C (44.1 F)-10.0 C (14.0 F)
Nov6.0 C (42.8 F)-33.0 C (-27.4 F)n/an/a
Dec5.8 C (42.4 F)-35.1 C (-31.2 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Mt. Ryan by the year they were set 1,464 records at Mt. Ryan still stand. 1992 holds the most, with 75. 0204060801981: 41982: 391983: 31984: 341985: 391986: 581987: 181988: 191989: 401990: 281991: 371992: 751993: 321994: 151995: 451996: 261997: 391998: 201999: 422000: 192001: 262002: 342003: 492004: 512005: 262006: 232007: 552008: 342009: 622010: 152011: 172012: 302013: 572014: 622015: 312016: 232017: 192018: 122019: 222020: 172021: 392022: 202023: 302024: 222025: 382026: 181981198619911996200120062011201620212026
1,464 records at Mt. Ryan still stand. 1992 holds the most, with 75.
Standing records at Mt. Ryan by the year they were set
Year setStanding records
19814
198239
19833
198434
198539
198658
198718
198819
198940
199028
199137
199275
199332
199415
199545
199626
199739
199820
199942
200019
200126
200234
200349
200451
200526
200623
200755
200834
200962
201015
201117
201230
201357
201462
201531
201623
201719
201812
201922
202017
202139
202220
202330
202422
202538
202618

All-Time Record Progression

2 new records
When Mt. Ryan set new all-time records 2 all-time records were set at Mt. Ryan between 24 July 2023 and 24 August 2025. Each dot is a new record. Record high minimum temperatureRecord daily precipitation24 July 2023: Record high minimum temperature 18.3 C (64.9 F)24 August 2025: Record daily precipitation 63.5 mm (2.5 in)2025
2 all-time records were set at Mt. Ryan between 24 July 2023 and 24 August 2025. Each dot is a new record.
When Mt. Ryan set new all-time records
DateKindDetail
2023-07-24Record high minimum temperatureRecord high minimum temperature 18.3 C (64.9 F)
2025-08-24Record daily precipitationRecord daily precipitation 63.5 mm (2.5 in)

Wettest Day of Each Month

Aug: 63.5 mm (2.5 in)
Record daily precipitation for each month at Mt. Ryan The wettest day on record for each calendar month at Mt. Ryan. The most was 63.5 mm (2.5 in) on 24 August 2025. 020406080 Jan: 20.3 mm (0.8 in), 13 January 1993 Jan Feb: 22.9 mm (0.9 in), 15 February 2005 Feb Mar: 20.3 mm (0.8 in), 23 March 2020 Mar Apr: 33.0 mm (1.3 in), 26 April 2002 Apr May: 20.3 mm (0.8 in), 27 May 2012 May Jun: 38.1 mm (1.5 in), 25 June 1994 Jun Jul: 55.9 mm (2.2 in), 27 July 2003 Jul Aug: 63.5 mm (2.5 in), 24 August 2025 Aug Sep: 38.1 mm (1.5 in), 14 September 2015 Sep Oct: 27.9 mm (1.1 in), 22 October 2024 Oct Nov: 38.1 mm (1.5 in), 17 November 1994 Nov Dec: 53.3 mm (2.1 in), 26 December 2021 Dec
The wettest day on record for each calendar month at Mt. Ryan. The most was 63.5 mm (2.5 in) on 24 August 2025.
Record daily precipitation for each month at Mt. Ryan
MonthRecord daily precipitation (mm)Date
Jan20.3 mm (0.8 in)13 January 1993
Feb22.9 mm (0.9 in)15 February 2005
Mar20.3 mm (0.8 in)23 March 2020
Apr33.0 mm (1.3 in)26 April 2002
May20.3 mm (0.8 in)27 May 2012
Jun38.1 mm (1.5 in)25 June 1994
Jul55.9 mm (2.2 in)27 July 2003
Aug63.5 mm (2.5 in)24 August 2025
Sep38.1 mm (1.5 in)14 September 2015
Oct27.9 mm (1.1 in)22 October 2024
Nov38.1 mm (1.5 in)17 November 1994
Dec53.3 mm (2.1 in)26 December 2021

Period of Record Coverage

1981 to 2026
Days with data per year at Mt. Ryan 46 years of record at Mt. Ryan, 1981 to 2026. 23 years have data for under 90 percent of days and are left out of rankings: 1981, 1982, 1983, 1984, 1985, 1989, 1990, 1991 and others. 1981: 84 of 365 days1982: 123 of 365 days1983: 31 of 365 days1984: 220 of 366 days1985: 81 of 365 days1986: 353 of 365 days1987: 359 of 365 days1988: 364 of 366 days1989: 269 of 365 days1990: 219 of 365 days1991: 313 of 365 days1992: 359 of 366 days1993: 267 of 365 days1994: 119 of 365 days1995: 233 of 365 days1996: 350 of 366 days1997: 351 of 365 days1998: 354 of 365 days1999: 310 of 365 days2000: 305 of 366 days2001: 291 of 365 days2002: 149 of 365 days2003: 304 of 365 days2004: 340 of 366 days2005: 307 of 365 days2006: 308 of 365 days2007: 350 of 365 days2008: 355 of 366 days2009: 361 of 365 days2010: 238 of 365 days2011: 259 of 365 days2012: 362 of 366 days2013: 363 of 365 days2014: 362 of 365 days2015: 357 of 365 days2016: 365 of 366 days2017: 361 of 365 days2018: 363 of 365 days2019: 280 of 365 days2020: 269 of 366 days2021: 362 of 365 days2022: 365 of 365 days2023: 361 of 365 days2024: 340 of 366 days2025: 365 of 365 days2026: 285 of 365 days1990200020102020
46 years of record at Mt. Ryan, 1981 to 2026. 23 years have data for under 90 percent of days and are left out of rankings: 1981, 1982, 1983, 1984, 1985, 1989, 1990, 1991 and others.
Days with data per year at Mt. Ryan
YearDays with dataShare of yearComplete
19818423%No
198212334%No
1983318%No
198422060%No
19858122%No
198635397%Yes
198735998%Yes
198836499%Yes
198926974%No
199021960%No
199131386%No
199235998%Yes
199326773%No
199411933%No
199523364%No
199635096%Yes
199735196%Yes
199835497%Yes
199931085%No
200030583%No
200129180%No
200214941%No
200330483%No
200434093%Yes
200530784%No
200630884%No
200735096%Yes
200835597%Yes
200936199%Yes
201023865%No
201125971%No
201236299%Yes
201336399%Yes
201436299%Yes
201535798%Yes
2016365100%Yes
201736199%Yes
201836399%Yes
201928077%No
202026973%No
202136299%Yes
2022365100%Yes
202336199%Yes
202434093%Yes
2025365100%Yes
202628578%No

Latest Records

20
Latest records at Mt. Ryan
DateStationRecordValueBeat old record byOld record stoodSignificance
2 October 2026Mt. Ryan, USdaily low max (Provisional)-5.6 C (21.9 F)0.6 C (1.1 F)36 years14 of 100 (Routine)
1 October 2026Mt. Ryan, USdaily rain (Tie, Provisional)2.5 mm (0.10 in)tie43 years4 of 100 (Routine)
26 September 2026Mt. Ryan, USdaily high max (Tie, Provisional)11.7 C (53.1 F)tie24 years2 of 100 (Routine)
21 September 2026Mt. Ryan, USdaily rain (Tie, Provisional)7.6 mm (0.30 in)tie12 years1 of 100 (Routine)
16 September 2026Mt. Ryan, USdaily rain (Provisional)25.4 mm (1.0 in)15.2 mm (0.6 in)19 years44 of 100 (Notable)
12 September 2026Mt. Ryan, USdaily rain (Provisional)15.2 mm (0.6 in)5.0 mm (0.20 in)28 years20 of 100 (Routine)
9 September 2026Mt. Ryan, USdaily rain (Tie, Provisional)10.2 mm (0.4 in)tie28 years3 of 100 (Routine)
4 September 2026Mt. Ryan, USdaily rain (Provisional)20.3 mm (0.8 in)10.1 mm (0.4 in)4 years20 of 100 (Routine)
25 August 2026Mt. Ryan, USdaily rain (Tie, Provisional)12.7 mm (0.5 in)tie40 years4 of 100 (Routine)
15 August 2026Mt. Ryan, USdaily rain (Tie)15.2 mm (0.6 in)tie24 years2 of 100 (Routine)
28 July 2026Mt. Ryan, USdaily low min (Tie)2.2 C (36.0 F)tie4 years1 of 100 (Routine)
23 July 2026Mt. Ryan, USdaily rain20.3 mm (0.8 in)5.1 mm (0.20 in)39 years20 of 100 (Routine)
23 July 2026Mt. Ryan, USdaily low max8.9 C (48.0 F)0.1 C (0.2 F)40 years16 of 100 (Routine)
28 June 2026Mt. Ryan, USdaily rain20.3 mm (0.8 in)2.5 mm (0.10 in)37 years19 of 100 (Routine)
8 June 2026Mt. Ryan, USdaily rain (Tie)10.2 mm (0.4 in)tie8 years1 of 100 (Routine)
22 April 2026Mt. Ryan, USdaily low max-5.0 C (23.0 F)0.6 C (1.1 F)3 years4 of 100 (Routine)
21 April 2026Mt. Ryan, USdaily rain7.6 mm (0.30 in)2.5 mm (0.10 in)24 years17 of 100 (Routine)
21 April 2026Mt. Ryan, USdaily low min-16.1 C (3.0 F)2.8 C (5.0 F)8 years10 of 100 (Routine)
19 April 2026Mt. Ryan, USdaily rain (Tie)7.6 mm (0.30 in)tie24 years2 of 100 (Routine)
11 April 2026Mt. Ryan, USdaily rain (Tie)2.5 mm (0.10 in)tie37 years3 of 100 (Routine)

Climate Trend

23 complete years, 1986 to 2025
Annual mean temperature at Mt. Ryan as warming stripes, 1986 to 2025 One stripe for each of 23 complete years at Mt. Ryan, 1986 to 2025. Blue stripes are years cooler than the station's own mean of -2.7 C (27.2 F); red stripes are warmer. The coolest year was 2012, at -4.4 C (24.0 F), and the warmest was 2016, at -1.0 C (30.1 F). The strongest colour marks a difference of 1.8 C (3.2 F). 1986: -3.8 C, -1.2 C from the station mean1987: -2.5 C, +0.2 C from the station mean1988: -2.8 C, -0.1 C from the station mean1992: -4.1 C, -1.5 C from the station mean1996: -3.7 C, -1.0 C from the station mean1997: -1.9 C, +0.8 C from the station mean1998: -1.8 C, +0.9 C from the station mean2004: -1.9 C, +0.8 C from the station mean2006: -2.8 C, -0.1 C from the station mean2007: -2.1 C, +0.6 C from the station mean2008: -4.0 C, -1.4 C from the station mean2009: -2.5 C, +0.2 C from the station mean2012: -4.4 C, -1.8 C from the station mean2013: -3.4 C, -0.8 C from the station mean2014: -1.6 C, +1.0 C from the station mean2015: -1.9 C, +0.8 C from the station mean2016: -1.0 C, +1.6 C from the station mean2017: -1.7 C, +0.9 C from the station mean2018: -1.7 C, +1.0 C from the station mean2021: -3.9 C, -1.2 C from the station mean2022: -2.9 C, -0.3 C from the station mean2023: -2.6 C, +0.1 C from the station mean2025: -2.1 C, +0.6 C from the station mean198619901995200020052010201520202025
One stripe for each of 23 complete years at Mt. Ryan, 1986 to 2025. Blue stripes are years cooler than the station's own mean of -2.7 C (27.2 F); red stripes are warmer. The coolest year was 2012, at -4.4 C (24.0 F), and the warmest was 2016, at -1.0 C (30.1 F). The strongest colour marks a difference of 1.8 C (3.2 F).
Annual mean temperature at Mt. Ryan as warming stripes, 1986 to 2025
YearAnnual mean temperatureDifference from the station mean
1986-3.8 C-1.17 C
1987-2.5 C+0.19 C
1988-2.8 C-0.12 C
1992-4.1 C-1.47 C
1996-3.7 C-1.04 C
1997-1.9 C+0.78 C
1998-1.8 C+0.86 C
2004-1.9 C+0.77 C
2006-2.8 C-0.14 C
2007-2.1 C+0.59 C
2008-4.0 C-1.38 C
2009-2.5 C+0.17 C
2012-4.4 C-1.77 C
2013-3.4 C-0.77 C
2014-1.6 C+1.04 C
2015-1.9 C+0.78 C
2016-1.0 C+1.64 C
2017-1.7 C+0.94 C
2018-1.7 C+1.01 C
2021-3.9 C-1.22 C
2022-2.9 C-0.27 C
2023-2.6 C+0.07 C
2025-2.1 C+0.61 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

1981 to 2026
Yearly extremes at Mt. Ryan: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)32.0 C (89.6 F)199126.1 C (78.9 F)46
Coldest night (TNn)-43.0 C (-45.4 F)1989-33.2 C (-27.8 F)46
Wettest day (Rx1day)63.5 mm (2.5 in)202525.4 mm (1.0 in)45
Wettest five days (Rx5day)111.8 mm (4.4 in)198653.3 mm (2.1 in)45
Longest dry spell (CDD)76 days201728 days45

Hottest day (TXx)

Hottest day (TXx) at Mt. Ryan by year The hottest day of the year at Mt. Ryan, 1981 to 2026. The record is 32.0 C (89.6 F) in 1991, marked on the chart; the median year is 26.1 C (78.9 F). 0102030401990200020102020Record: 32.0 C (89.6 F) in 1991
The hottest day of the year at Mt. Ryan, 1981 to 2026. The record is 32.0 C (89.6 F) in 1991, marked on the chart; the median year is 26.1 C (78.9 F).
Hottest day (TXx) at Mt. Ryan by year
YearHottest day (TXx)
19810.0 C (32.0 F)
19828.0 C (46.4 F)
19838.0 C (46.4 F)
198422.0 C (71.6 F)
19854.0 C (39.2 F)
198627.0 C (80.6 F)
198726.0 C (78.8 F)
198824.0 C (75.2 F)
198926.0 C (78.8 F)
199028.0 C (82.4 F)
199132.0 C (89.6 F)
199230.0 C (86.0 F)
199328.0 C (82.4 F)
199430.0 C (86.0 F)
199522.0 C (71.6 F)
199624.0 C (75.2 F)
199726.0 C (78.8 F)
199827.0 C (80.6 F)
199927.6 C (81.7 F)
200025.9 C (78.6 F)
200123.4 C (74.1 F)
200225.9 C (78.6 F)
200327.2 C (81.0 F)
200429.4 C (84.9 F)
200527.2 C (81.0 F)
200625.7 C (78.3 F)
200726.1 C (79.0 F)
200823.5 C (74.3 F)
200928.8 C (83.8 F)
201027.2 C (81.0 F)
201123.7 C (74.7 F)
201224.1 C (75.4 F)
201327.2 C (81.0 F)
201423.7 C (74.7 F)
201527.8 C (82.0 F)
201625.9 C (78.6 F)
201725.6 C (78.1 F)
201826.1 C (79.0 F)
201926.6 C (79.9 F)
202022.8 C (73.0 F)
202126.7 C (80.1 F)
202226.7 C (80.1 F)
202327.8 C (82.0 F)
202427.2 C (81.0 F)
202526.7 C (80.1 F)
202625.0 C (77.0 F)

Coldest night (TNn)

Coldest night (TNn) at Mt. Ryan by year The coldest night of the year at Mt. Ryan, 1981 to 2026. The record is -43.0 C (-45.4 F) in 1989, marked on the chart; the median year is -33.2 C (-27.8 F). -50-40-30-201990200020102020Record: -43.0 C (-45.4 F) in 1989
The coldest night of the year at Mt. Ryan, 1981 to 2026. The record is -43.0 C (-45.4 F) in 1989, marked on the chart; the median year is -33.2 C (-27.8 F).
Coldest night (TNn) at Mt. Ryan by year
YearColdest night (TNn)
1981-33.0 C (-27.4 F)
1982-40.0 C (-40.0 F)
1983-22.0 C (-7.6 F)
1984-31.0 C (-23.8 F)
1985-30.0 C (-22.0 F)
1986-33.0 C (-27.4 F)
1987-34.0 C (-29.2 F)
1988-33.0 C (-27.4 F)
1989-43.0 C (-45.4 F)
1990-33.0 C (-27.4 F)
1991-37.0 C (-34.6 F)
1992-32.0 C (-25.6 F)
1993-41.0 C (-41.8 F)
1994-30.0 C (-22.0 F)
1995-34.0 C (-29.2 F)
1996-34.0 C (-29.2 F)
1997-39.0 C (-38.2 F)
1998-33.0 C (-27.4 F)
1999-40.0 C (-40.0 F)
2000-33.5 C (-28.3 F)
2001-30.3 C (-22.5 F)
2002-25.6 C (-14.1 F)
2003-31.7 C (-25.1 F)
2004-35.9 C (-32.6 F)
2005-32.8 C (-27.0 F)
2006-34.5 C (-30.1 F)
2007-34.8 C (-30.6 F)
2008-34.6 C (-30.3 F)
2009-34.0 C (-29.2 F)
2010-32.9 C (-27.2 F)
2011-31.8 C (-25.2 F)
2012-36.6 C (-33.9 F)
2013-32.6 C (-26.7 F)
2014-31.2 C (-24.2 F)
2015-33.6 C (-28.5 F)
2016-28.5 C (-19.3 F)
2017-33.6 C (-28.5 F)
2018-32.1 C (-25.8 F)
2019-34.3 C (-29.7 F)
2020-30.6 C (-23.1 F)
2021-36.7 C (-34.1 F)
2022-33.9 C (-29.0 F)
2023-29.4 C (-20.9 F)
2024-37.2 C (-35.0 F)
2025-32.8 C (-27.0 F)
2026-34.4 C (-29.9 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at Mt. Ryan by year The wettest day of the year at Mt. Ryan, 1981 to 2026. The record is 63.5 mm (2.5 in) in 2025, marked on the chart; the median year is 25.4 mm (1.0 in). 0204060801990200020102020Record: 63.5 mm (2.5 in) in 2025
The wettest day of the year at Mt. Ryan, 1981 to 2026. The record is 63.5 mm (2.5 in) in 2025, marked on the chart; the median year is 25.4 mm (1.0 in).
Wettest day (Rx1day) at Mt. Ryan by year
YearWettest day (Rx1day)
1981n/a
198217.8 mm (0.7 in)
198320.3 mm (0.8 in)
198427.9 mm (1.1 in)
198530.5 mm (1.2 in)
198661.0 mm (2.4 in)
198725.4 mm (1.0 in)
198817.8 mm (0.7 in)
198922.9 mm (0.9 in)
199020.3 mm (0.8 in)
199138.1 mm (1.5 in)
199217.8 mm (0.7 in)
199325.4 mm (1.0 in)
199438.1 mm (1.5 in)
199540.6 mm (1.6 in)
199622.9 mm (0.9 in)
199725.4 mm (1.0 in)
199825.4 mm (1.0 in)
199927.9 mm (1.1 in)
200033.0 mm (1.3 in)
200125.4 mm (1.0 in)
200233.0 mm (1.3 in)
200355.9 mm (2.2 in)
200412.7 mm (0.5 in)
200533.0 mm (1.3 in)
200620.3 mm (0.8 in)
200735.6 mm (1.4 in)
200825.4 mm (1.0 in)
200922.9 mm (0.9 in)
201017.8 mm (0.7 in)
201117.8 mm (0.7 in)
201220.3 mm (0.8 in)
201327.9 mm (1.1 in)
201435.6 mm (1.4 in)
201538.1 mm (1.5 in)
201633.0 mm (1.3 in)
201722.9 mm (0.9 in)
201843.2 mm (1.7 in)
201933.0 mm (1.3 in)
202022.9 mm (0.9 in)
202153.3 mm (2.1 in)
202212.7 mm (0.5 in)
202322.9 mm (0.9 in)
202427.9 mm (1.1 in)
202563.5 mm (2.5 in)
202625.4 mm (1.0 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Mt. Ryan by year The wettest five days of the year at Mt. Ryan, 1981 to 2026. The record is 111.8 mm (4.4 in) in 1986, marked on the chart; the median year is 53.3 mm (2.1 in). 02550751001251990200020102020Record: 111.8 mm (4.4 in) in 1986
The wettest five days of the year at Mt. Ryan, 1981 to 2026. The record is 111.8 mm (4.4 in) in 1986, marked on the chart; the median year is 53.3 mm (2.1 in).
Wettest five days (Rx5day) at Mt. Ryan by year
YearWettest five days (Rx5day)
1981n/a
198222.9 mm (0.9 in)
198330.4 mm (1.2 in)
198453.3 mm (2.1 in)
198550.9 mm (2.0 in)
1986111.8 mm (4.4 in)
198735.5 mm (1.4 in)
198845.7 mm (1.8 in)
198943.2 mm (1.7 in)
199038.1 mm (1.5 in)
199166.1 mm (2.6 in)
199233.0 mm (1.3 in)
199353.4 mm (2.1 in)
199488.9 mm (3.5 in)
199578.7 mm (3.1 in)
199653.4 mm (2.1 in)
199750.8 mm (2.0 in)
199840.7 mm (1.6 in)
199955.9 mm (2.2 in)
200050.7 mm (2.0 in)
200145.7 mm (1.8 in)
200281.3 mm (3.2 in)
2003104.2 mm (4.1 in)
200438.2 mm (1.5 in)
200558.4 mm (2.3 in)
200645.8 mm (1.8 in)
200763.5 mm (2.5 in)
200871.2 mm (2.8 in)
200966.0 mm (2.6 in)
201027.9 mm (1.1 in)
201150.8 mm (2.0 in)
201243.2 mm (1.7 in)
201348.2 mm (1.9 in)
201453.4 mm (2.1 in)
201548.4 mm (1.9 in)
201678.7 mm (3.1 in)
201758.4 mm (2.3 in)
201850.8 mm (2.0 in)
201973.7 mm (2.9 in)
202045.7 mm (1.8 in)
202191.4 mm (3.6 in)
202238.1 mm (1.5 in)
202353.4 mm (2.1 in)
202491.5 mm (3.6 in)
202581.3 mm (3.2 in)
202658.4 mm (2.3 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Mt. Ryan by year The longest dry spell of the year at Mt. Ryan, 1981 to 2026. The record is 76 days in 2017, marked on the chart; the median year is 28 days. 0204060801990200020102020Record: 76 days in 2017
The longest dry spell of the year at Mt. Ryan, 1981 to 2026. The record is 76 days in 2017, marked on the chart; the median year is 28 days.
Longest dry spell (CDD) at Mt. Ryan by year
YearLongest dry spell (CDD)
1981n/a
198219 days
198324 days
198429 days
198522 days
198632 days
198726 days
198825 days
198922 days
199023 days
199130 days
199223 days
199326 days
199425 days
199539 days
199630 days
199747 days
199838 days
199925 days
200039 days
200132 days
200228 days
200328 days
200442 days
200522 days
200627 days
200728 days
200821 days
200921 days
201036 days
201119 days
201273 days
201324 days
201432 days
201533 days
201650 days
201776 days
201828 days
201920 days
202026 days
202137 days
202257 days
202323 days
202430 days
202523 days
202621 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.

Frost Dates and Growing Season

23 years with a frost

Across 23 years with a frost, the median last spring frost at Mt. Ryan falls on 29 May and the median first autumn frost on 1 September, which leaves a median of 95 days between them.

Frost dates and growing season at Mt. Ryan
MeasureMedian, all yearsEarliest periodRecent period (1986 to 2025)Recent against earliestFitted trend
Last spring frost29 Mayn/a29 Mayn/an/a
First autumn frost1 Septembern/a1 Septembern/an/a
Growing days95 daysn/a95 daysn/an/a

A frost day is a day with a daily minimum at or below 0 C (32 F). The last spring frost and the first autumn frost are the last and first such days of the cold season, and growing days are the days between them. A negative trend for the last spring frost means it comes earlier.

Rainfall Return Levels

40 years, 1983 to 2025

A day with at least 27.4 mm (1.1 in) of rain is expected about once in 2 years. A day with at least 75.2 mm (3.0 in) of rain is expected about once in 100 years.

Rainfall return levels at Mt. Ryan: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years27.4 mm (1.1 in)
5 years37.7 mm (1.5 in)
10 years45.5 mm (1.8 in)
25 years56.4 mm (2.2 in)
50 years65.4 mm (2.6 in)Longer than the 40 years of record
100 years75.2 mm (3.0 in)Longer than the 40 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, 40 years of values from 1983 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: 63.5 mm (2.5 in) in 2025; 61.0 mm (2.4 in) in 1986; 55.9 mm (2.2 in) in 2003.

Download the Data

  • Data for Mt. Ryan standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Mt. Ryan 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).