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Built 2026-10-18 (18 October 2026)

Perseverance Dam Threshold Days by Year

4 fixed thresholds counted per year at Perseverance Dam (ASN00040480): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Perseverance Dam Thresholds

  • Perseverance Dam: days with 10 mm (0.39 in) or more of precipitation in 54 years, most in 1978 with 42.
  • Perseverance Dam: days with 25 mm (0.98 in) or more of precipitation in 54 years, most in 1988 with 19.
  • Perseverance Dam: days with 50 mm (1.97 in) or more of precipitation in 44 years, most in 2004 with 7.
  • Perseverance Dam: days with 100 mm (3.94 in) or more of precipitation in 8 years, most in 2011 with 2.
  • 4 fixed thresholds have at least one qualifying day at Perseverance Dam.
54 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Perseverance Dam Days per year at Perseverance Dam with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 42 in 1978. 02040601972: 291973: 241974: 311975: 221976: 381977: 191978: 421979: 221980: 211981: 341982: 271983: 391984: 261985: 231986: 231987: 231988: 331989: 291990: 201991: 181992: 291993: 151994: 111995: 281996: 311997: 201998: 231999: 302000: 162001: 222002: 192003: 222004: 202005: 212006: 202007: 252008: 292009: 232010: 262011: 352012: 192013: 262014: 192015: 212016: 202017: 242018: 212019: 82020: 252021: 332022: 362023: 202024: 272025: 27197219781984199019962002200820142020
Days per year at Perseverance Dam with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 42 in 1978.
Days with 10 mm (0.39 in) or more of precipitation per year at Perseverance Dam
YearDaysDecade average
19722928.4
19732428.4
19743128.4
19752228.4
19763828.4
19771928.4
19784228.4
19792228.4
19802127.8
19813427.8
19822727.8
19833927.8
19842627.8
19852327.8
19862327.8
19872327.8
19883327.8
19892927.8
19902022.5
19911822.5
19922922.5
19931522.5
19941122.5
19952822.5
19963122.5
19972022.5
19982322.5
19993022.5
20001621.7
20012221.7
20021921.7
20032221.7
20042021.7
20052121.7
20062021.7
20072521.7
20082921.7
20092321.7
20102621.9
20113521.9
20121921.9
20132621.9
20141921.9
20152121.9
20162021.9
20172421.9
20182121.9
2019821.9
20202528
20213328
20223628
20232028
20242728
20252728
First to last qualifying date each year at Perseverance Dam For each year, a bar from the first to the last day at Perseverance Dam meeting 10 mm (0.39 in). 1972: 15 January 1972 to 29 December 19721973: 10 January 1973 to 26 December 19731974: 1 January 1974 to 29 December 19741975: 9 January 1975 to 24 December 19751976: 10 January 1976 to 31 December 19761977: 4 January 1977 to 15 November 19771978: 6 January 1978 to 30 December 19781979: 19 January 1979 to 22 December 19791980: 28 January 1980 to 31 December 19801981: 1 January 1981 to 30 December 19811982: 6 January 1982 to 30 December 19821983: 3 January 1983 to 28 December 19831984: 15 January 1984 to 30 December 19841985: 1 January 1985 to 14 December 19851986: 2 January 1986 to 26 December 19861987: 5 January 1987 to 31 December 19871988: 1 January 1988 to 19 December 19881989: 6 January 1989 to 25 December 19891990: 16 January 1990 to 14 December 19901991: 6 January 1991 to 21 December 19911992: 1 January 1992 to 26 November 19921993: 5 January 1993 to 9 December 19931994: 18 February 1994 to 11 December 19941995: 20 January 1995 to 24 December 19951996: 3 January 1996 to 31 December 19961997: 29 January 1997 to 28 December 19971998: 29 January 1998 to 21 December 19981999: 2 January 1999 to 28 December 19992000: 2 January 2000 to 30 December 20002001: 9 January 2001 to 31 December 20012002: 3 February 2002 to 27 December 20022003: 4 February 2003 to 17 December 20032004: 11 January 2004 to 28 December 20042005: 7 January 2005 to 17 December 20052006: 5 January 2006 to 28 December 20062007: 4 January 2007 to 18 December 20072008: 1 January 2008 to 28 December 20082009: 24 January 2009 to 30 December 20092010: 4 January 2010 to 19 November 20102011: 6 January 2011 to 11 December 20112012: 16 January 2012 to 26 December 20122013: 25 January 2013 to 17 December 20132014: 7 January 2014 to 27 December 20142015: 2 January 2015 to 13 December 20152016: 4 January 2016 to 26 December 20162017: 3 January 2017 to 27 December 20172018: 29 January 2018 to 17 December 20182019: 8 March 2019 to 25 December 20192020: 17 January 2020 to 21 December 20202021: 7 January 2021 to 10 December 20212022: 8 January 2022 to 13 December 20222023: 20 January 2023 to 26 December 20232024: 16 January 2024 to 31 December 20242025: 8 January 2025 to 8 December 202519721979198619932000200720142021JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Perseverance Dam meeting 10 mm (0.39 in).
First to last qualifying date each year at Perseverance Dam
YearFirst dateLast date
19721972-01-151972-12-29
19731973-01-101973-12-26
19741974-01-011974-12-29
19751975-01-091975-12-24
19761976-01-101976-12-31
19771977-01-041977-11-15
19781978-01-061978-12-30
19791979-01-191979-12-22
19801980-01-281980-12-31
19811981-01-011981-12-30
19821982-01-061982-12-30
19831983-01-031983-12-28
19841984-01-151984-12-30
19851985-01-011985-12-14
19861986-01-021986-12-26
19871987-01-051987-12-31
19881988-01-011988-12-19
19891989-01-061989-12-25
19901990-01-161990-12-14
19911991-01-061991-12-21
19921992-01-011992-11-26
19931993-01-051993-12-09
19941994-02-181994-12-11
19951995-01-201995-12-24
19961996-01-031996-12-31
19971997-01-291997-12-28
19981998-01-291998-12-21
19991999-01-021999-12-28
20002000-01-022000-12-30
20012001-01-092001-12-31
20022002-02-032002-12-27
20032003-02-042003-12-17
20042004-01-112004-12-28
20052005-01-072005-12-17
20062006-01-052006-12-28
20072007-01-042007-12-18
20082008-01-012008-12-28
20092009-01-242009-12-30
20102010-01-042010-11-19
20112011-01-062011-12-11
20122012-01-162012-12-26
20132013-01-252013-12-17
20142014-01-072014-12-27
20152015-01-022015-12-13
20162016-01-042016-12-26
20172017-01-032017-12-27
20182018-01-292018-12-17
20192019-03-082019-12-25
20202020-01-172020-12-21
20212021-01-072021-12-10
20222022-01-082022-12-13
20232023-01-202023-12-26
20242024-01-162024-12-31
20252025-01-082025-12-08

Every Fixed Threshold

Fixed thresholds at Perseverance Dam
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain5442197827
25 mm (0.98 in): Days with 25 mm or more rain541919887
50 mm (1.97 in): Days with 50 mm or more rain44720041
100 mm (3.94 in): Days with 100 mm or more rain8220111

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1972.

Download the Data

  • Data for Perseverance Dam 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 2026-10-16 (16 October 2026). Threshold counts are computed by this site.

Data as of . Last revised (2025-12-31).