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Built 2026-10-19 (19 October 2026)

Parley's Summit Threshold Days by Year (USS0011J52S)

10 fixed thresholds counted per year at Parley's Summit (USS0011J52S): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Parley's Summit Thresholds

  • Parley's Summit: days with 10 mm (0.39 in) or more of precipitation in 48 years, most in 1983 with 46.
  • Parley's Summit: days with 25 mm (0.98 in) or more of precipitation in 48 years, most in 1982 with 18.
  • Parley's Summit: days with a maximum temperature at or below 0 C (32 F) in 22 years, most in 2007 with 82.
  • Parley's Summit: nights with a minimum temperature at or below 0 C (32 F) in 22 years, most in 2006 with 214.
  • 10 fixed thresholds have at least one qualifying day at Parley's Summit.
18 years with a qualifying day
Days at or above 30 C (86 F) per year at Parley's Summit Days per year at Parley's Summit with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 9 in 2021. 051015202005: 52006: 72007: 22009: 12012: 52013: 42014: 22015: 32016: 62017: 22018: 62020: 82021: 92022: 72023: 42024: 82025: 32026: 16200520072012201420162018202120232025
Days per year at Parley's Summit with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 9 in 2021.
Days at or above 30 C (86 F) per year at Parley's Summit
YearDaysDecade average
200553.8
200673.8
200723.8
200913.8
201254
201344
201424
201534
201664
201724
201864
202087.9
202197.9
202277.9
202347.9
202487.9
202537.9
2026167.9
First to last qualifying date each year at Parley's Summit For each year, a bar from the first to the last day at Parley's Summit meeting 30 C (86 F). 2005: 13 July 2005 to 21 July 20052006: 15 July 2006 to 28 July 20062007: 25 July 2007 to 13 August 20072009: 22 August 2009 to 22 August 20092012: 10 July 2012 to 8 August 20122013: 28 June 2013 to 2 July 20132014: 14 July 2014 to 23 July 20142015: 28 June 2015 to 25 August 20152016: 22 July 2016 to 2 August 20162017: 6 July 2017 to 8 July 20172018: 6 July 2018 to 11 August 20182020: 31 July 2020 to 22 August 20202021: 7 July 2021 to 13 August 20212022: 17 July 2022 to 7 September 20222023: 16 July 2023 to 23 July 20232024: 10 July 2024 to 6 August 20242025: 13 August 2025 to 20 August 20252026: 11 July 2026 to 20 August 2026200520092014201720212024JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Parley's Summit meeting 30 C (86 F).
First to last qualifying date each year at Parley's Summit
YearFirst dateLast date
20052005-07-132005-07-21
20062006-07-152006-07-28
20072007-07-252007-08-13
20092009-08-222009-08-22
20122012-07-102012-08-08
20132013-06-282013-07-02
20142014-07-142014-07-23
20152015-06-282015-08-25
20162016-07-222016-08-02
20172017-07-062017-07-08
20182018-07-062018-08-11
20202020-07-312020-08-22
20212021-07-072021-08-13
20222022-07-172022-09-07
20232023-07-162023-07-23
20242024-07-102024-08-06
20252025-08-132025-08-20
20262026-07-112026-08-20

Every Fixed Threshold

Fixed thresholds at Parley's Summit
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days189202116
90 F (32.2 C): Days3120212
0 C (32 F): Ice days (max2282200714
0 C (32 F): Frost days (min22214200696
-10 C (14 F): Days with min2271200711
-20 C (-4 F): Days with min16720132
20 C (68 F): Tropical nights (min10n/a1
10 mm (0.39 in): Days with 10 mm or more rain4846198319
25 mm (0.98 in): Days with 25 mm or more rain481819823
50 mm (1.97 in): Days with 50 mm or more rain8119831

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 2005.

Download the Data

  • Data for Parley's Summit 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).