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Built 2026-10-19 (19 October 2026)

Union Pass Arizona Threshold Days by Year (USR0000AUNI)

10 fixed thresholds counted per year at Union Pass Arizona (USR0000AUNI): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Union Pass Arizona Thresholds

  • Union Pass Arizona: days with a maximum temperature at or above 30 C (86 F) in 32 years, most in 2020 with 150.
  • Union Pass Arizona: days with a maximum temperature at or above 35 C (95 F) in 32 years, most in 2024 with 87.
  • Union Pass Arizona: days with a maximum temperature at or above 90 F (32.2 C) in 32 years, most in 2020 with 123.
  • Union Pass Arizona: days with a maximum temperature at or above 100 F (37.8 C) in 32 years, most in 2024 with 29.
  • 10 fixed thresholds have at least one qualifying day at Union Pass Arizona.
32 years with a qualifying day
Days at or above 30 C (86 F) per year at Union Pass Arizona Days per year at Union Pass Arizona with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 150 in 2020. 0501001501995: 1081996: 1061997: 1231998: 951999: 1162000: 1352001: 1452002: 1262003: 1412004: 1292005: 1142006: 1322007: 1322008: 1312009: 1372010: 1142011: 1252012: 1402013: 1162014: 1232015: 1192016: 1102017: 1142018: 1322019: 1062020: 1502021: 1272022: 1262023: 1212024: 1402025: 1212026: 14419951999200320072011201520192023
Days per year at Union Pass Arizona with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 150 in 2020.
Days at or above 30 C (86 F) per year at Union Pass Arizona
YearDaysDecade average
1995108109.6
1996106109.6
1997123109.6
199895109.6
1999116109.6
2000135132.2
2001145132.2
2002126132.2
2003141132.2
2004129132.2
2005114132.2
2006132132.2
2007132132.2
2008131132.2
2009137132.2
2010114119.9
2011125119.9
2012140119.9
2013116119.9
2014123119.9
2015119119.9
2016110119.9
2017114119.9
2018132119.9
2019106119.9
2020150132.7
2021127132.7
2022126132.7
2023121132.7
2024140132.7
2025121132.7
2026144132.7
First to last qualifying date each year at Union Pass Arizona For each year, a bar from the first to the last day at Union Pass Arizona meeting 30 C (86 F). 1995: 30 May 1995 to 20 October 19951996: 24 April 1996 to 13 October 19961997: 4 May 1997 to 5 October 19971998: 1 June 1998 to 12 October 19981999: 19 April 1999 to 22 October 19992000: 7 April 2000 to 7 October 20002001: 25 April 2001 to 19 October 20012002: 13 April 2002 to 13 October 20022003: 16 May 2003 to 28 October 20032004: 20 March 2004 to 9 October 20042005: 14 May 2005 to 1 October 20052006: 30 April 2006 to 7 November 20062007: 16 March 2007 to 28 October 20072008: 16 May 2008 to 28 October 20082009: 20 April 2009 to 3 November 20092010: 31 May 2010 to 15 October 20102011: 1 April 2011 to 23 October 20112012: 19 April 2012 to 19 October 20122013: 27 April 2013 to 21 September 20132014: 2 May 2014 to 6 October 20142015: 30 April 2015 to 14 October 20152016: 12 May 2016 to 21 October 20162017: 2 May 2017 to 17 October 20172018: 24 April 2018 to 30 September 20182019: 24 April 2019 to 16 September 20192020: 25 April 2020 to 5 November 20202021: 3 April 2021 to 4 October 20212022: 6 May 2022 to 14 October 20222023: 28 April 2023 to 21 October 20232024: 21 April 2024 to 13 October 20242025: 10 April 2025 to 9 October 20252026: 18 March 2026 to 9 October 202619951999200320072011201520192023JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Union Pass Arizona meeting 30 C (86 F).
First to last qualifying date each year at Union Pass Arizona
YearFirst dateLast date
19951995-05-301995-10-20
19961996-04-241996-10-13
19971997-05-041997-10-05
19981998-06-011998-10-12
19991999-04-191999-10-22
20002000-04-072000-10-07
20012001-04-252001-10-19
20022002-04-132002-10-13
20032003-05-162003-10-28
20042004-03-202004-10-09
20052005-05-142005-10-01
20062006-04-302006-11-07
20072007-03-162007-10-28
20082008-05-162008-10-28
20092009-04-202009-11-03
20102010-05-312010-10-15
20112011-04-012011-10-23
20122012-04-192012-10-19
20132013-04-272013-09-21
20142014-05-022014-10-06
20152015-04-302015-10-14
20162016-05-122016-10-21
20172017-05-022017-10-17
20182018-04-242018-09-30
20192019-04-242019-09-16
20202020-04-252020-11-05
20212021-04-032021-10-04
20222022-05-062022-10-14
20232023-04-282023-10-21
20242024-04-212024-10-13
20252025-04-102025-10-09
20262026-03-182026-10-09

Every Fixed Threshold

Fixed thresholds at Union Pass Arizona
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days321502020144
35 C (95 F): Days3287202467
40 C (104 F): Days271220207
90 F (32.2 C): Days321232020104
100 F (37.8 C): Days3229202428
110 F (43.3 C): Days1220052
0 C (32 F): Ice days (max2120071
0 C (32 F): Frost days (min311620131
20 C (68 F): Tropical nights (min321552020151
25 C (77 F): Days with min3293202471

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1995.

Download the Data

  • Data for Union Pass Arizona 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).