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Built 2026-10-18 (18 October 2026)

Copeton Dam Threshold Days by Year

4 fixed thresholds counted per year at Copeton Dam (ASN00054128): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Copeton Dam Thresholds

  • Copeton Dam: days with 10 mm (0.39 in) or more of precipitation in 53 years, most in 1978 with 41.
  • Copeton Dam: days with 25 mm (0.98 in) or more of precipitation in 53 years, most in 1983 with 16.
  • Copeton Dam: days with 50 mm (1.97 in) or more of precipitation in 42 years, most in 1970 with 5.
  • Copeton Dam: days with 100 mm (3.94 in) or more of precipitation in 2 years, most in 1976 with 1.
  • 4 fixed thresholds have at least one qualifying day at Copeton Dam.
53 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Copeton Dam Days per year at Copeton Dam with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 41 in 1978. 02040601969: 251970: 341971: 291972: 231973: 331974: 151975: 331976: 261977: 221978: 411980: 161981: 221982: 241983: 411984: 301985: 271986: 201987: 361988: 271989: 301990: 261991: 231992: 241993: 241994: 171995: 301996: 261997: 281998: 381999: 322000: 272001: 262002: 172003: 232004: 302005: 222006: 192007: 232008: 302009: 162011: 302012: 252013: 192014: 212016: 282017: 302018: 132021: 352022: 292023: 252024: 312025: 302026: 12196919751982198819942000200620132022
Days per year at Copeton Dam with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 41 in 1978.
Days with 10 mm (0.39 in) or more of precipitation per year at Copeton Dam
YearDaysDecade average
19692525
19703428.4
19712928.4
19722328.4
19733328.4
19741528.4
19753328.4
19762628.4
19772228.4
19784128.4
19801627.3
19812227.3
19822427.3
19834127.3
19843027.3
19852727.3
19862027.3
19873627.3
19882727.3
19893027.3
19902626.8
19912326.8
19922426.8
19932426.8
19941726.8
19953026.8
19962626.8
19972826.8
19983826.8
19993226.8
20002723.3
20012623.3
20021723.3
20032323.3
20043023.3
20052223.3
20061923.3
20072323.3
20083023.3
20091623.3
20113023.7
20122523.7
20131923.7
20142123.7
20162823.7
20173023.7
20181323.7
20213527
20222927
20232527
20243127
20253027
20261227
First to last qualifying date each year at Copeton Dam For each year, a bar from the first to the last day at Copeton Dam meeting 10 mm (0.39 in). 1969: 2 January 1969 to 23 December 19691970: 2 January 1970 to 30 December 19701971: 18 January 1971 to 27 December 19711972: 13 January 1972 to 31 December 19721973: 5 January 1973 to 29 December 19731974: 8 January 1974 to 10 December 19741975: 4 January 1975 to 23 December 19751976: 3 January 1976 to 16 November 19761977: 12 January 1977 to 3 December 19771978: 5 January 1978 to 30 December 19781980: 15 January 1980 to 29 December 19801981: 23 February 1981 to 25 December 19811982: 8 January 1982 to 30 December 19821983: 2 January 1983 to 27 December 19831984: 3 January 1984 to 20 December 19841985: 9 January 1985 to 11 December 19851986: 5 January 1986 to 2 December 19861987: 13 January 1987 to 24 December 19871988: 17 January 1988 to 27 December 19881989: 6 January 1989 to 27 December 19891990: 14 January 1990 to 31 December 19901991: 6 January 1991 to 31 December 19911992: 1 January 1992 to 9 December 19921993: 24 January 1993 to 16 December 19931994: 21 January 1994 to 25 December 19941995: 3 January 1995 to 19 December 19951996: 3 January 1996 to 31 December 19961997: 29 January 1997 to 15 December 19971998: 5 January 1998 to 21 December 19981999: 2 January 1999 to 28 December 19992000: 28 January 2000 to 28 December 20002001: 29 January 2001 to 16 December 20012002: 8 January 2002 to 24 December 20022003: 8 January 2003 to 28 December 20032004: 8 January 2004 to 28 December 20042005: 18 January 2005 to 17 December 20052006: 8 January 2006 to 3 December 20062007: 24 January 2007 to 23 December 20072008: 6 January 2008 to 28 December 20082009: 23 January 2009 to 31 December 20092011: 6 January 2011 to 23 December 20112012: 15 January 2012 to 29 December 20122013: 22 January 2013 to 5 December 20132014: 24 January 2014 to 30 December 20142016: 4 January 2016 to 25 December 20162017: 2 January 2017 to 27 December 20172018: 26 January 2018 to 14 December 20182021: 7 January 2021 to 28 December 20212022: 12 January 2022 to 13 December 20222023: 4 January 2023 to 26 December 20232024: 19 January 2024 to 28 December 20242025: 30 January 2025 to 11 December 20252026: 3 January 2026 to 26 August 202619691976198419911998200520132023JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Copeton Dam meeting 10 mm (0.39 in).
First to last qualifying date each year at Copeton Dam
YearFirst dateLast date
19691969-01-021969-12-23
19701970-01-021970-12-30
19711971-01-181971-12-27
19721972-01-131972-12-31
19731973-01-051973-12-29
19741974-01-081974-12-10
19751975-01-041975-12-23
19761976-01-031976-11-16
19771977-01-121977-12-03
19781978-01-051978-12-30
19801980-01-151980-12-29
19811981-02-231981-12-25
19821982-01-081982-12-30
19831983-01-021983-12-27
19841984-01-031984-12-20
19851985-01-091985-12-11
19861986-01-051986-12-02
19871987-01-131987-12-24
19881988-01-171988-12-27
19891989-01-061989-12-27
19901990-01-141990-12-31
19911991-01-061991-12-31
19921992-01-011992-12-09
19931993-01-241993-12-16
19941994-01-211994-12-25
19951995-01-031995-12-19
19961996-01-031996-12-31
19971997-01-291997-12-15
19981998-01-051998-12-21
19991999-01-021999-12-28
20002000-01-282000-12-28
20012001-01-292001-12-16
20022002-01-082002-12-24
20032003-01-082003-12-28
20042004-01-082004-12-28
20052005-01-182005-12-17
20062006-01-082006-12-03
20072007-01-242007-12-23
20082008-01-062008-12-28
20092009-01-232009-12-31
20112011-01-062011-12-23
20122012-01-152012-12-29
20132013-01-222013-12-05
20142014-01-242014-12-30
20162016-01-042016-12-25
20172017-01-022017-12-27
20182018-01-262018-12-14
20212021-01-072021-12-28
20222022-01-122022-12-13
20232023-01-042023-12-26
20242024-01-192024-12-28
20252025-01-302025-12-11
20262026-01-032026-08-26

Every Fixed Threshold

Fixed thresholds at Copeton Dam
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain5341197812
25 mm (0.98 in): Days with 25 mm or more rain531619832
50 mm (1.97 in): Days with 50 mm or more rain42519701
100 mm (3.94 in): Days with 100 mm or more rain2119761

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1969.

Download the Data

  • Data for Copeton 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 (2026-10-12).