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Built 2026-10-19 (19 October 2026)

Copper Bottom Threshold Days by Year (USS0012B16S)

14 fixed thresholds counted per year at Copper Bottom (USS0012B16S): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Copper Bottom Thresholds

  • Copper Bottom: days with 10 mm (0.39 in) or more of precipitation in 47 years, most in 1996 with 28.
  • Copper Bottom: days with a maximum temperature at or above 30 C (86 F) in 35 years, most in 1991 with 59.
  • Copper Bottom: days with a maximum temperature at or below 0 C (32 F) in 35 years, most in 1996 with 83.
  • Copper Bottom: days with 25 mm (0.98 in) or more of precipitation in 35 years, most in 2017 with 6.
  • 14 fixed thresholds have at least one qualifying day at Copper Bottom.
35 years with a qualifying day
Days at or above 30 C (86 F) per year at Copper Bottom Days per year at Copper Bottom with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 59 in 1991. 02040601991: 591992: 221993: 41994: 241995: 121996: 261997: 61998: 191999: 82000: 162001: 132002: 122003: 242004: 62005: 102006: 102007: 182008: 92009: 32010: 22011: 62012: 112013: 72014: 52015: 132016: 32017: 142018: 82019: 62021: 242022: 242023: 132024: 272025: 172026: 23199119951999200320072011201520192024
Days per year at Copper Bottom with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 59 in 1991.
Days at or above 30 C (86 F) per year at Copper Bottom
YearDaysDecade average
19915920
19922220
1993420
19942420
19951220
19962620
1997620
19981920
1999820
20001612.1
20011312.1
20021212.1
20032412.1
2004612.1
20051012.1
20061012.1
20071812.1
2008912.1
2009312.1
201027.5
201167.5
2012117.5
201377.5
201457.5
2015137.5
201637.5
2017147.5
201887.5
201967.5
20212421.3
20222421.3
20231321.3
20242721.3
20251721.3
20262321.3
First to last qualifying date each year at Copper Bottom For each year, a bar from the first to the last day at Copper Bottom meeting 30 C (86 F). 1991: 2 June 1991 to 11 October 19911992: 6 May 1992 to 19 August 19921993: 20 June 1993 to 9 August 19931994: 20 June 1994 to 21 August 19941995: 8 July 1995 to 3 September 19951996: 7 June 1996 to 30 August 19961997: 14 July 1997 to 26 August 19971998: 9 July 1998 to 7 September 19981999: 27 July 1999 to 30 August 19992000: 12 July 2000 to 15 September 20002001: 3 July 2001 to 25 September 20012002: 26 June 2002 to 25 July 20022003: 18 June 2003 to 15 August 20032004: 14 July 2004 to 14 August 20042005: 8 July 2005 to 29 August 20052006: 17 July 2006 to 8 August 20062007: 28 June 2007 to 30 August 20072008: 29 June 2008 to 18 August 20082009: 23 July 2009 to 21 August 20092010: 30 July 2010 to 26 August 20102011: 17 July 2011 to 27 August 20112012: 8 July 2012 to 28 August 20122013: 1 July 2013 to 1 September 20132014: 13 July 2014 to 12 August 20142015: 26 June 2015 to 26 August 20152016: 25 July 2016 to 31 August 20162017: 5 July 2017 to 3 September 20172018: 6 July 2018 to 11 August 20182019: 23 July 2019 to 21 August 20192021: 3 June 2021 to 8 September 20212022: 17 June 2022 to 7 September 20222023: 20 July 2023 to 29 August 20232024: 8 July 2024 to 8 September 20242025: 31 May 2025 to 3 September 20252026: 11 July 2026 to 26 August 20261991199620012006201120162022JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Copper Bottom meeting 30 C (86 F).
First to last qualifying date each year at Copper Bottom
YearFirst dateLast date
19911991-06-021991-10-11
19921992-05-061992-08-19
19931993-06-201993-08-09
19941994-06-201994-08-21
19951995-07-081995-09-03
19961996-06-071996-08-30
19971997-07-141997-08-26
19981998-07-091998-09-07
19991999-07-271999-08-30
20002000-07-122000-09-15
20012001-07-032001-09-25
20022002-06-262002-07-25
20032003-06-182003-08-15
20042004-07-142004-08-14
20052005-07-082005-08-29
20062006-07-172006-08-08
20072007-06-282007-08-30
20082008-06-292008-08-18
20092009-07-232009-08-21
20102010-07-302010-08-26
20112011-07-172011-08-27
20122012-07-082012-08-28
20132013-07-012013-09-01
20142014-07-132014-08-12
20152015-06-262015-08-26
20162016-07-252016-08-31
20172017-07-052017-09-03
20182018-07-062018-08-11
20192019-07-232019-08-21
20212021-06-032021-09-08
20222022-06-172022-09-07
20232023-07-202023-08-29
20242024-07-082024-09-08
20252025-05-312025-09-03
20262026-07-112026-08-26

Every Fixed Threshold

Fixed thresholds at Copper Bottom
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days3559199123
35 C (95 F): Days101619912
40 C (104 F): Days1119911
90 F (32.2 C): Days3045199110
100 F (37.8 C): Days1419914
0 C (32 F): Ice days (max358319965
0 C (32 F): Frost days (min332731996117
-10 C (14 F): Days with min3394199720
-20 C (-4 F): Days with min333619963
-30 C (-22 F): Days with min281020114
-40 C (-40 F): Days with min4220242
10 mm (0.39 in): Days with 10 mm or more rain4728199615
25 mm (0.98 in): Days with 25 mm or more rain35620172
50 mm (1.97 in): Days with 50 mm or more rain4120031

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1991.

Download the Data

  • Data for Copper Bottom 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).