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Built 2026-10-19 (19 October 2026)

Rock Springs Threshold Days by Year (USS0018F01S)

12 fixed thresholds counted per year at Rock Springs (USS0018F01S): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Rock Springs Thresholds

  • Rock Springs: days with 10 mm (0.39 in) or more of precipitation in 46 years, most in 1981 with 28.
  • Rock Springs: days with a maximum temperature at or above 30 C (86 F) in 38 years, most in 1994 with 39.
  • Rock Springs: days with a maximum temperature at or below 0 C (32 F) in 38 years, most in 2001 with 58.
  • Rock Springs: days with a maximum temperature at or above 90 F (32.2 C) in 34 years, most in 1994 with 20.
  • 12 fixed thresholds have at least one qualifying day at Rock Springs.
38 years with a qualifying day
Days at or above 30 C (86 F) per year at Rock Springs Days per year at Rock Springs with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 39 in 1994. 0102030401989: 131990: 321991: 221992: 261993: 71994: 391995: 171996: 331997: 141998: 381999: 232000: 292001: 322002: 302003: 312004: 212005: 242006: 232007: 262008: 122009: 182010: 82011: 82012: 192013: 192014: 152015: 172016: 102017: 292018: 152019: 52020: 162021: 332022: 332023: 112024: 202025: 122026: 261989199319972001200520092013201720212025
Days per year at Rock Springs with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 39 in 1994.
Days at or above 30 C (86 F) per year at Rock Springs
YearDaysDecade average
19891313
19903225.1
19912225.1
19922625.1
1993725.1
19943925.1
19951725.1
19963325.1
19971425.1
19983825.1
19992325.1
20002924.6
20013224.6
20023024.6
20033124.6
20042124.6
20052424.6
20062324.6
20072624.6
20081224.6
20091824.6
2010814.5
2011814.5
20121914.5
20131914.5
20141514.5
20151714.5
20161014.5
20172914.5
20181514.5
2019514.5
20201621.6
20213321.6
20223321.6
20231121.6
20242021.6
20251221.6
20262621.6
First to last qualifying date each year at Rock Springs For each year, a bar from the first to the last day at Rock Springs meeting 30 C (86 F). 1989: 7 July 1989 to 7 August 19891990: 21 June 1990 to 11 September 19901991: 2 July 1991 to 6 September 19911992: 21 June 1992 to 22 September 19921993: 20 June 1993 to 10 September 19931994: 20 June 1994 to 27 September 19941995: 17 July 1995 to 15 September 19951996: 7 June 1996 to 10 September 19961997: 5 July 1997 to 9 September 19971998: 7 July 1998 to 6 September 19981999: 14 June 1999 to 27 August 19992000: 4 June 2000 to 14 September 20002001: 23 May 2001 to 12 September 20012002: 14 June 2002 to 14 September 20022003: 17 June 2003 to 28 September 20032004: 23 June 2004 to 15 August 20042005: 12 July 2005 to 8 September 20052006: 25 June 2006 to 5 September 20062007: 4 July 2007 to 30 August 20072008: 28 June 2008 to 24 August 20082009: 16 July 2009 to 24 September 20092010: 16 July 2010 to 1 October 20102011: 6 July 2011 to 8 September 20112012: 7 July 2012 to 17 August 20122013: 28 June 2013 to 19 August 20132014: 2 July 2014 to 11 August 20142015: 26 June 2015 to 12 September 20152016: 29 June 2016 to 18 August 20162017: 19 June 2017 to 5 September 20172018: 13 July 2018 to 14 August 20182019: 3 August 2019 to 28 August 20192020: 20 July 2020 to 5 September 20202021: 2 June 2021 to 7 September 20212022: 27 June 2022 to 7 September 20222023: 15 July 2023 to 16 August 20232024: 6 July 2024 to 1 September 20242025: 30 June 2025 to 2 September 20252026: 7 July 2026 to 26 August 202619891994199920042009201420192024JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Rock Springs meeting 30 C (86 F).
First to last qualifying date each year at Rock Springs
YearFirst dateLast date
19891989-07-071989-08-07
19901990-06-211990-09-11
19911991-07-021991-09-06
19921992-06-211992-09-22
19931993-06-201993-09-10
19941994-06-201994-09-27
19951995-07-171995-09-15
19961996-06-071996-09-10
19971997-07-051997-09-09
19981998-07-071998-09-06
19991999-06-141999-08-27
20002000-06-042000-09-14
20012001-05-232001-09-12
20022002-06-142002-09-14
20032003-06-172003-09-28
20042004-06-232004-08-15
20052005-07-122005-09-08
20062006-06-252006-09-05
20072007-07-042007-08-30
20082008-06-282008-08-24
20092009-07-162009-09-24
20102010-07-162010-10-01
20112011-07-062011-09-08
20122012-07-072012-08-17
20132013-06-282013-08-19
20142014-07-022014-08-11
20152015-06-262015-09-12
20162016-06-292016-08-18
20172017-06-192017-09-05
20182018-07-132018-08-14
20192019-08-032019-08-28
20202020-07-202020-09-05
20212021-06-022021-09-07
20222022-06-272022-09-07
20232023-07-152023-08-16
20242024-07-062024-09-01
20252025-06-302025-09-02
20262026-07-072026-08-26

Every Fixed Threshold

Fixed thresholds at Rock Springs
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days3839199426
35 C (95 F): Days15720031
40 C (104 F): Days1120021
90 F (32.2 C): Days342019947
100 F (37.8 C): Days3320021
0 C (32 F): Ice days (max385820015
0 C (32 F): Frost days (min33215200278
-10 C (14 F): Days with min334220024
-20 C (-4 F): Days with min12519981
20 C (68 F): Tropical nights (min1120031
10 mm (0.39 in): Days with 10 mm or more rain462819817
25 mm (0.98 in): Days with 25 mm or more rain20319891

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1989.

Download the Data

  • Data for Rock Springs 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).