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Built 2026-10-19 (19 October 2026)

Arco Idaho Threshold Days by Year

12 fixed thresholds counted per year at Arco Idaho (USR0000IARC): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Arco Idaho Thresholds

  • Arco Idaho: days with a maximum temperature at or above 30 C (86 F) in 40 years, most in 2003 with 70.
  • Arco Idaho: days with a maximum temperature at or below 0 C (32 F) in 40 years, most in 2022 with 85.
  • Arco Idaho: nights with a minimum temperature at or below 0 C (32 F) in 40 years, most in 2002 with 225.
  • Arco Idaho: nights with a minimum temperature at or below -10 C (14 F) in 40 years, most in 2008 with 120.
  • 12 fixed thresholds have at least one qualifying day at Arco Idaho.
40 years with a qualifying day
Days at or above 30 C (86 F) per year at Arco Idaho Days per year at Arco Idaho with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 70 in 2003. 0204060801987: 251988: 641989: 311990: 471991: 401992: 321993: 61994: 621995: 271996: 461997: 261998: 481999: 362000: 542001: 642002: 512003: 702004: 342005: 462006: 582007: 602008: 612009: 462010: 472011: 412012: 612013: 672014: 322015: 402016: 512017: 552018: 472019: 402020: 602021: 642022: 662023: 342024: 532025: 552026: 581987199119951999200320072011201520192023
Days per year at Arco Idaho with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 70 in 2003.
Days at or above 30 C (86 F) per year at Arco Idaho
YearDaysDecade average
19872540
19886440
19893140
19904737
19914037
19923237
1993637
19946237
19952737
19964637
19972637
19984837
19993637
20005454.4
20016454.4
20025154.4
20037054.4
20043454.4
20054654.4
20065854.4
20076054.4
20086154.4
20094654.4
20104748.1
20114148.1
20126148.1
20136748.1
20143248.1
20154048.1
20165148.1
20175548.1
20184748.1
20194048.1
20206055.7
20216455.7
20226655.7
20233455.7
20245355.7
20255555.7
20265855.7
First to last qualifying date each year at Arco Idaho For each year, a bar from the first to the last day at Arco Idaho meeting 30 C (86 F). 1987: 15 June 1987 to 24 September 19871988: 3 June 1988 to 9 September 19881989: 29 June 1989 to 17 August 19891990: 22 June 1990 to 14 September 19901991: 2 July 1991 to 6 September 19911992: 21 June 1992 to 21 August 19921993: 19 July 1993 to 10 September 19931994: 19 June 1994 to 28 September 19941995: 8 July 1995 to 16 September 19951996: 7 June 1996 to 10 September 19961997: 4 July 1997 to 9 September 19971998: 2 July 1998 to 16 September 19981999: 20 June 1999 to 9 September 19992000: 4 June 2000 to 16 September 20002001: 12 May 2001 to 24 September 20012002: 30 May 2002 to 15 September 20022003: 24 May 2003 to 26 September 20032004: 3 June 2004 to 11 September 20042005: 20 June 2005 to 8 September 20052006: 17 May 2006 to 12 September 20062007: 16 June 2007 to 3 September 20072008: 17 May 2008 to 30 September 20082009: 18 May 2009 to 26 September 20092010: 24 June 2010 to 2 October 20102011: 22 June 2011 to 30 September 20112012: 4 June 2012 to 8 September 20122013: 7 June 2013 to 4 September 20132014: 24 June 2014 to 17 September 20142015: 8 June 2015 to 25 September 20152016: 5 June 2016 to 1 September 20162017: 4 June 2017 to 12 September 20172018: 13 June 2018 to 7 September 20182019: 30 June 2019 to 5 September 20192020: 29 May 2020 to 17 September 20202021: 2 June 2021 to 10 September 20212022: 16 June 2022 to 12 September 20222023: 1 July 2023 to 29 August 20232024: 8 June 2024 to 28 September 20242025: 29 May 2025 to 4 September 20252026: 12 May 2026 to 5 October 202619871992199720022007201220172022JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Arco Idaho meeting 30 C (86 F).
First to last qualifying date each year at Arco Idaho
YearFirst dateLast date
19871987-06-151987-09-24
19881988-06-031988-09-09
19891989-06-291989-08-17
19901990-06-221990-09-14
19911991-07-021991-09-06
19921992-06-211992-08-21
19931993-07-191993-09-10
19941994-06-191994-09-28
19951995-07-081995-09-16
19961996-06-071996-09-10
19971997-07-041997-09-09
19981998-07-021998-09-16
19991999-06-201999-09-09
20002000-06-042000-09-16
20012001-05-122001-09-24
20022002-05-302002-09-15
20032003-05-242003-09-26
20042004-06-032004-09-11
20052005-06-202005-09-08
20062006-05-172006-09-12
20072007-06-162007-09-03
20082008-05-172008-09-30
20092009-05-182009-09-26
20102010-06-242010-10-02
20112011-06-222011-09-30
20122012-06-042012-09-08
20132013-06-072013-09-04
20142014-06-242014-09-17
20152015-06-082015-09-25
20162016-06-052016-09-01
20172017-06-042017-09-12
20182018-06-132018-09-07
20192019-06-302019-09-05
20202020-05-292020-09-17
20212021-06-022021-09-10
20222022-06-162022-09-12
20232023-07-012023-08-29
20242024-06-082024-09-28
20252025-05-292025-09-04
20262026-05-122026-10-05

Every Fixed Threshold

Fixed thresholds at Arco Idaho
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days4070200358
35 C (95 F): Days3626200323
40 C (104 F): Days1220022
90 F (32.2 C): Days3948202142
100 F (37.8 C): Days8820032
0 C (32 F): Ice days (max408520229
0 C (32 F): Frost days (min402252002117
-10 C (14 F): Days with min40120200826
-20 C (-4 F): Days with min3942198919
-30 C (-22 F): Days with min25619891
-40 C (-40 F): Days with min1119901
20 C (68 F): Tropical nights (min3120051

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1987.

Download the Data

  • Data for Arco Idaho 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).