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Built 2026-10-15 (15 October 2026)

Promontory Arizona Threshold Days by Year

7 fixed thresholds counted per year at Promontory Arizona (USR0000APRO): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Promontory Arizona Thresholds

  • Promontory Arizona: days with a maximum temperature at or below 0 C (32 F) in 31 years, most in 1997 with 23.
  • Promontory Arizona: nights with a minimum temperature at or below 0 C (32 F) in 31 years, most in 1998 with 145.
  • Promontory Arizona: nights with a minimum temperature at or below -10 C (14 F) in 31 years, most in 2013 with 23.
  • Promontory Arizona: days with a maximum temperature at or above 30 C (86 F) in 25 years, most in 2020 with 19.
  • 7 fixed thresholds have at least one qualifying day at Promontory Arizona.
25 years with a qualifying day
Days at or above 30 C (86 F) per year at Promontory Arizona Days per year at Promontory Arizona with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 19 in 2020. 051015201994: 81995: 91997: 21998: 42003: 102005: 112006: 32007: 92008: 32009: 12010: 12011: 12012: 32013: 42016: 82017: 142018: 102019: 92020: 192021: 102022: 22023: 112024: 92025: 82026: 11199419982006200920122017202020232026
Days per year at Promontory Arizona with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 19 in 2020.
Days at or above 30 C (86 F) per year at Promontory Arizona
YearDaysDecade average
199485.8
199595.8
199725.8
199845.8
2003106.2
2005116.2
200636.2
200796.2
200836.2
200916.2
201016.3
201116.3
201236.3
201346.3
201686.3
2017146.3
2018106.3
201996.3
20201910
20211010
2022210
20231110
2024910
2025810
20261110
First to last qualifying date each year at Promontory Arizona For each year, a bar from the first to the last day at Promontory Arizona meeting 30 C (86 F). 1994: 24 June 1994 to 4 August 19941995: 25 July 1995 to 6 August 19951997: 14 July 1997 to 15 July 19971998: 28 June 1998 to 16 July 19982003: 4 July 2003 to 10 August 20032005: 20 June 2005 to 21 July 20052006: 13 July 2006 to 18 July 20062007: 15 June 2007 to 15 July 20072008: 20 June 2008 to 31 July 20082009: 20 August 2009 to 20 August 20092010: 6 June 2010 to 6 June 20102011: 2 July 2011 to 2 July 20112012: 20 June 2012 to 30 June 20122013: 27 June 2013 to 9 July 20132016: 4 June 2016 to 29 July 20162017: 16 June 2017 to 7 July 20172018: 20 June 2018 to 7 August 20182019: 10 July 2019 to 6 September 20192020: 23 June 2020 to 6 September 20202021: 13 June 2021 to 10 July 20212022: 8 July 2022 to 22 July 20222023: 3 July 2023 to 27 July 20232024: 6 June 2024 to 13 July 20242025: 18 June 2025 to 9 August 20252026: 23 June 2026 to 27 August 20261994200320082012201820222026JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Promontory Arizona meeting 30 C (86 F).
First to last qualifying date each year at Promontory Arizona
YearFirst dateLast date
19941994-06-241994-08-04
19951995-07-251995-08-06
19971997-07-141997-07-15
19981998-06-281998-07-16
20032003-07-042003-08-10
20052005-06-202005-07-21
20062006-07-132006-07-18
20072007-06-152007-07-15
20082008-06-202008-07-31
20092009-08-202009-08-20
20102010-06-062010-06-06
20112011-07-022011-07-02
20122012-06-202012-06-30
20132013-06-272013-07-09
20162016-06-042016-07-29
20172017-06-162017-07-07
20182018-06-202018-08-07
20192019-07-102019-09-06
20202020-06-232020-09-06
20212021-06-132021-07-10
20222022-07-082022-07-22
20232023-07-032023-07-27
20242024-06-062024-07-13
20252025-06-182025-08-09
20262026-06-232026-08-27

Every Fixed Threshold

Fixed thresholds at Promontory Arizona
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days2519202011
90 F (32.2 C): Days13720171
0 C (32 F): Ice days (max312319976
0 C (32 F): Frost days (min31145199845
-10 C (14 F): Days with min312320132
-20 C (-4 F): Days with min1320113
20 C (68 F): Tropical nights (min3420214

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1994.

Download the Data

  • Data for Promontory 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 2026-10-14 (14 October 2026). Threshold counts are computed by this site.

Data as of . Last revised (2026-10-14).