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Built 2026-10-19 (19 October 2026)

Ralston Rsvr Threshold Days by Year (USC00056816)

17 fixed thresholds counted per year at Ralston Rsvr (USC00056816): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Ralston Rsvr Thresholds

  • Ralston Rsvr: days with 10 cm (3.9 in) or more of snowfall in 48 years, most in 1983 with 13.
  • Ralston Rsvr: days with 10 mm (0.39 in) or more of precipitation in 47 years, most in 1999 with 26.
  • Ralston Rsvr: days with 25 mm (0.98 in) or more of precipitation in 46 years, most in 1983 with 7.
  • Ralston Rsvr: days with a maximum temperature at or above 30 C (86 F) in 29 years, most in 2020 with 77.
  • 17 fixed thresholds have at least one qualifying day at Ralston Rsvr.
29 years with a qualifying day
Days at or above 30 C (86 F) per year at Ralston Rsvr Days per year at Ralston Rsvr with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 77 in 2020. 0204060801998: 531999: 332000: 732001: 552002: 652003: 512004: 302005: 522006: 472007: 352008: 412009: 222010: 502011: 592012: 702013: 602014: 372015: 482016: 532017: 402018: 432019: 632020: 772021: 632022: 722023: 472024: 712025: 612026: 791998200120042007201020132016201920222025
Days per year at Ralston Rsvr with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 77 in 2020.
Days at or above 30 C (86 F) per year at Ralston Rsvr
YearDaysDecade average
19985343
19993343
20007347.1
20015547.1
20026547.1
20035147.1
20043047.1
20055247.1
20064747.1
20073547.1
20084147.1
20092247.1
20105052.3
20115952.3
20127052.3
20136052.3
20143752.3
20154852.3
20165352.3
20174052.3
20184352.3
20196352.3
20207767.1
20216367.1
20227267.1
20234767.1
20247167.1
20256167.1
20267967.1
First to last qualifying date each year at Ralston Rsvr For each year, a bar from the first to the last day at Ralston Rsvr meeting 30 C (86 F). 1998: 3 June 1998 to 19 September 19981999: 8 June 1999 to 7 September 19992000: 5 May 2000 to 18 September 20002001: 3 June 2001 to 28 September 20012002: 31 May 2002 to 8 September 20022003: 30 May 2003 to 28 August 20032004: 6 May 2004 to 19 September 20042005: 20 May 2005 to 31 August 20052006: 20 May 2006 to 31 August 20062007: 11 June 2007 to 3 September 20072008: 11 June 2008 to 1 September 20082009: 30 June 2009 to 24 August 20092010: 28 May 2010 to 21 September 20102011: 6 June 2011 to 29 September 20112012: 5 May 2012 to 11 September 20122013: 18 May 2013 to 9 September 20132014: 4 June 2014 to 27 September 20142015: 3 June 2015 to 28 September 20152016: 10 June 2016 to 20 September 20162017: 10 June 2017 to 14 September 20172018: 2 June 2018 to 19 September 20182019: 27 June 2019 to 30 September 20192020: 19 May 2020 to 27 September 20202021: 5 June 2021 to 28 September 20212022: 20 May 2022 to 21 September 20222023: 20 June 2023 to 1 October 20232024: 6 June 2024 to 3 October 20242025: 11 June 2025 to 12 September 20252026: 22 March 2026 to 6 October 202619982002200620102014201820222026JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Ralston Rsvr meeting 30 C (86 F).
First to last qualifying date each year at Ralston Rsvr
YearFirst dateLast date
19981998-06-031998-09-19
19991999-06-081999-09-07
20002000-05-052000-09-18
20012001-06-032001-09-28
20022002-05-312002-09-08
20032003-05-302003-08-28
20042004-05-062004-09-19
20052005-05-202005-08-31
20062006-05-202006-08-31
20072007-06-112007-09-03
20082008-06-112008-09-01
20092009-06-302009-08-24
20102010-05-282010-09-21
20112011-06-062011-09-29
20122012-05-052012-09-11
20132013-05-182013-09-09
20142014-06-042014-09-27
20152015-06-032015-09-28
20162016-06-102016-09-20
20172017-06-102017-09-14
20182018-06-022018-09-19
20192019-06-272019-09-30
20202020-05-192020-09-27
20212021-06-052021-09-28
20222022-05-202022-09-21
20232023-06-202023-10-01
20242024-06-062024-10-03
20252025-06-112025-09-12
20262026-03-222026-10-06

Every Fixed Threshold

Fixed thresholds at Ralston Rsvr
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days2977202079
35 C (95 F): Days2819202214
90 F (32.2 C): Days2953202046
100 F (37.8 C): Days8420121
0 C (32 F): Ice days (max293620076
0 C (32 F): Frost days (min29156200847
-10 C (14 F): Days with min293920075
-20 C (-4 F): Days with min21720141
20 C (68 F): Tropical nights (min2715202210
10 mm (0.39 in): Days with 10 mm or more rain472619997
25 mm (0.98 in): Days with 25 mm or more rain46719831
50 mm (1.97 in): Days with 50 mm or more rain12119791
100 mm (3.94 in): Days with 100 mm or more rain1120131
200 mm (7.87 in): Days with 200 mm or more rain1120131
10 cm (3.9 in): Days with 10 cm or more snowfall481319833
25 cm (9.8 in): Days with 25 cm or more snowfall23320092
50 cm (19.7 in): Days with 50 cm or more snowfall5119901

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1998.

Download the Data

  • Data for Ralston Rsvr 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).