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Built 2026-10-19 (19 October 2026)

Promontory Threshold Days by Year (USS0011R10S)

11 fixed thresholds counted per year at Promontory (USS0011R10S): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Promontory Thresholds

  • Promontory: days with 10 mm (0.39 in) or more of precipitation in 43 years, most in 1992 with 50.
  • Promontory: days with 25 mm (0.98 in) or more of precipitation in 43 years, most in 1992 with 20.
  • Promontory: days with 50 mm (1.97 in) or more of precipitation in 39 years, most in 2008 with 6.
  • Promontory: days with a maximum temperature at or below 0 C (32 F) in 35 years, most in 1985 with 70.
  • 11 fixed thresholds have at least one qualifying day at Promontory.
29 years with a qualifying day
Days at or above 30 C (86 F) per year at Promontory Days per year at Promontory with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 29 in 2002. 01020301991: 31992: 11995: 211996: 151997: 81998: 91999: 32000: 182002: 292005: 122006: 62007: 82008: 32009: 32010: 12011: 32012: 72013: 82014: 12015: 22016: 132017: 122018: 132019: 102020: 272021: 132022: 12023: 92025: 21991199619992005200820112014201720202023
Days per year at Promontory with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 29 in 2002.
Days at or above 30 C (86 F) per year at Promontory
YearDaysDecade average
199138.6
199218.6
1995218.6
1996158.6
199788.6
199898.6
199938.6
20001811.3
20022911.3
20051211.3
2006611.3
2007811.3
2008311.3
2009311.3
201017
201137
201277
201387
201417
201527
2016137
2017127
2018137
2019107
20202710.4
20211310.4
2022110.4
2023910.4
2025210.4
First to last qualifying date each year at Promontory For each year, a bar from the first to the last day at Promontory meeting 30 C (86 F). 1991: 1 July 1991 to 3 July 19911992: 5 July 1992 to 5 July 19921995: 25 June 1995 to 10 August 19951996: 12 May 1996 to 13 August 19961997: 3 July 1997 to 25 July 19971998: 28 June 1998 to 16 July 19981999: 28 June 1999 to 1 July 19992000: 23 May 2000 to 14 September 20002002: 30 May 2002 to 15 August 20022005: 20 June 2005 to 21 July 20052006: 5 June 2006 to 15 July 20062007: 30 June 2007 to 16 July 20072008: 20 June 2008 to 31 July 20082009: 17 July 2009 to 20 August 20092010: 6 June 2010 to 6 June 20102011: 22 June 2011 to 2 July 20112012: 20 June 2012 to 1 July 20122013: 9 June 2013 to 9 July 20132014: 2 July 2014 to 2 July 20142015: 20 June 2015 to 23 June 20152016: 5 June 2016 to 29 July 20162017: 17 June 2017 to 7 July 20172018: 12 June 2018 to 7 August 20182019: 12 June 2019 to 31 August 20192020: 4 June 2020 to 16 September 20202021: 12 June 2021 to 11 July 20212022: 22 July 2022 to 22 July 20222023: 14 July 2023 to 27 July 20232025: 6 August 2025 to 7 August 202519911997200220082012201620202025JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Promontory meeting 30 C (86 F).
First to last qualifying date each year at Promontory
YearFirst dateLast date
19911991-07-011991-07-03
19921992-07-051992-07-05
19951995-06-251995-08-10
19961996-05-121996-08-13
19971997-07-031997-07-25
19981998-06-281998-07-16
19991999-06-281999-07-01
20002000-05-232000-09-14
20022002-05-302002-08-15
20052005-06-202005-07-21
20062006-06-052006-07-15
20072007-06-302007-07-16
20082008-06-202008-07-31
20092009-07-172009-08-20
20102010-06-062010-06-06
20112011-06-222011-07-02
20122012-06-202012-07-01
20132013-06-092013-07-09
20142014-07-022014-07-02
20152015-06-202015-06-23
20162016-06-052016-07-29
20172017-06-172017-07-07
20182018-06-122018-08-07
20192019-06-122019-08-31
20202020-06-042020-09-16
20212021-06-122021-07-11
20222022-07-222022-07-22
20232023-07-142023-07-27
20252025-08-062025-08-07

Every Fixed Threshold

Fixed thresholds at Promontory
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days292920022
90 F (32.2 C): Days14719951
0 C (32 F): Ice days (max357019856
0 C (32 F): Frost days (min32150199844
-10 C (14 F): Days with min321819922
-20 C (-4 F): Days with min1220112
20 C (68 F): Tropical nights (min7420171
10 mm (0.39 in): Days with 10 mm or more rain4350199224
25 mm (0.98 in): Days with 25 mm or more rain4320199210
50 mm (1.97 in): Days with 50 mm or more rain39620082
100 mm (3.94 in): Days with 100 mm or more rain7119911

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1991.

Download the Data

  • Data for Promontory 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).