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Built 2026-10-19 (19 October 2026)

Knowlton Montana Threshold Days by Year (USR0000MKNO)

13 fixed thresholds counted per year at Knowlton Montana (USR0000MKNO): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Knowlton Montana Thresholds

  • Knowlton Montana: nights with a minimum temperature at or below 0 C (32 F) in 41 years, most in 2002 with 186.
  • Knowlton Montana: nights with a minimum temperature at or below -10 C (14 F) in 41 years, most in 1996 with 82.
  • Knowlton Montana: nights with a minimum temperature at or below -20 C (-4 F) in 41 years, most in 1996 with 35.
  • Knowlton Montana: nights with a minimum temperature at or above 20 C (68 F) in 41 years, most in 1988 with 21.
  • 13 fixed thresholds have at least one qualifying day at Knowlton Montana.
40 years with a qualifying day
Days at or above 30 C (86 F) per year at Knowlton Montana Days per year at Knowlton Montana with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 67 in 2021. 0204060801986: 271987: 201988: 561990: 451991: 311992: 211993: 81994: 291995: 341996: 351997: 351998: 511999: 302000: 472001: 502002: 432003: 532004: 292005: 392006: 552007: 552008: 432009: 312010: 302011: 472012: 602013: 372014: 262015: 482016: 392017: 522018: 302019: 262020: 402021: 672022: 472023: 342024: 482025: 352026: 521986199119951999200320072011201520192023
Days per year at Knowlton Montana with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 67 in 2021.
Days at or above 30 C (86 F) per year at Knowlton Montana
YearDaysDecade average
19862734.3
19872034.3
19885634.3
19904531.9
19913131.9
19922131.9
1993831.9
19942931.9
19953431.9
19963531.9
19973531.9
19985131.9
19993031.9
20004744.5
20015044.5
20024344.5
20035344.5
20042944.5
20053944.5
20065544.5
20075544.5
20084344.5
20093144.5
20103039.5
20114739.5
20126039.5
20133739.5
20142639.5
20154839.5
20163939.5
20175239.5
20183039.5
20192639.5
20204046.1
20216746.1
20224746.1
20233446.1
20244846.1
20253546.1
20265246.1
First to last qualifying date each year at Knowlton Montana For each year, a bar from the first to the last day at Knowlton Montana meeting 30 C (86 F). 1986: 3 May 1986 to 29 August 19861987: 30 April 1987 to 14 September 19871988: 27 May 1988 to 6 September 19881990: 10 June 1990 to 25 September 19901991: 11 June 1991 to 7 September 19911992: 7 May 1992 to 1 October 19921993: 20 June 1993 to 21 August 19931994: 21 June 1994 to 9 September 19941995: 14 June 1995 to 11 October 19951996: 8 June 1996 to 4 September 19961997: 22 June 1997 to 2 October 19971998: 25 June 1998 to 18 September 19981999: 20 June 1999 to 6 September 19992000: 6 June 2000 to 17 September 20002001: 12 May 2001 to 1 October 20012002: 24 June 2002 to 16 September 20022003: 29 May 2003 to 8 September 20032004: 3 June 2004 to 18 September 20042005: 17 June 2005 to 1 October 20052006: 18 May 2006 to 13 September 20062007: 20 June 2007 to 22 September 20072008: 30 June 2008 to 20 September 20082009: 19 May 2009 to 19 September 20092010: 24 June 2010 to 28 September 20102011: 28 June 2011 to 4 October 20112012: 23 April 2012 to 15 September 20122013: 13 May 2013 to 17 September 20132014: 28 May 2014 to 26 September 20142015: 8 June 2015 to 10 October 20152016: 5 May 2016 to 2 September 20162017: 1 June 2017 to 12 September 20172018: 26 May 2018 to 10 September 20182019: 6 June 2019 to 16 September 20192020: 31 May 2020 to 24 September 20202021: 3 June 2021 to 6 October 20212022: 17 June 2022 to 7 September 20222023: 6 June 2023 to 17 September 20232024: 14 June 2024 to 29 September 20242025: 10 May 2025 to 30 September 20252026: 13 May 2026 to 10 September 202619861992199720022007201220172022JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Knowlton Montana meeting 30 C (86 F).
First to last qualifying date each year at Knowlton Montana
YearFirst dateLast date
19861986-05-031986-08-29
19871987-04-301987-09-14
19881988-05-271988-09-06
19901990-06-101990-09-25
19911991-06-111991-09-07
19921992-05-071992-10-01
19931993-06-201993-08-21
19941994-06-211994-09-09
19951995-06-141995-10-11
19961996-06-081996-09-04
19971997-06-221997-10-02
19981998-06-251998-09-18
19991999-06-201999-09-06
20002000-06-062000-09-17
20012001-05-122001-10-01
20022002-06-242002-09-16
20032003-05-292003-09-08
20042004-06-032004-09-18
20052005-06-172005-10-01
20062006-05-182006-09-13
20072007-06-202007-09-22
20082008-06-302008-09-20
20092009-05-192009-09-19
20102010-06-242010-09-28
20112011-06-282011-10-04
20122012-04-232012-09-15
20132013-05-132013-09-17
20142014-05-282014-09-26
20152015-06-082015-10-10
20162016-05-052016-09-02
20172017-06-012017-09-12
20182018-05-262018-09-10
20192019-06-062019-09-16
20202020-05-312020-09-24
20212021-06-032021-10-06
20222022-06-172022-09-07
20232023-06-062023-09-17
20242024-06-142024-09-29
20252025-05-102025-09-30
20262026-05-132026-09-10

Every Fixed Threshold

Fixed thresholds at Knowlton Montana
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days4067202152
35 C (95 F): Days3824201216
40 C (104 F): Days8220072
90 F (32.2 C): Days4049202135
100 F (37.8 C): Days23820038
110 F (43.3 C): Days2120021
0 C (32 F): Ice days (max4084199625
0 C (32 F): Frost days (min41186200285
-10 C (14 F): Days with min4182199619
-20 C (-4 F): Days with min413519965
-30 C (-22 F): Days with min15719901
20 C (68 F): Tropical nights (min4121198816
25 C (77 F): Days with min8220072

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1986.

Download the Data

  • Data for Knowlton Montana 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).