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Built 2026-10-19 (19 October 2026)

Seventeen Seventy Threshold Days by Year (ASN00039314)

9 fixed thresholds counted per year at Seventeen Seventy (ASN00039314): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Seventeen Seventy Thresholds

  • Seventeen Seventy: days with 10 mm (0.39 in) or more of precipitation in 38 years, most in 1989 with 47.
  • Seventeen Seventy: days with 25 mm (0.98 in) or more of precipitation in 38 years, most in 1989 with 26.
  • Seventeen Seventy: days with 50 mm (1.97 in) or more of precipitation in 38 years, most in 2022 with 13.
  • Seventeen Seventy: days with a maximum temperature at or above 30 C (86 F) in 34 years, most in 2025 with 106.
  • 9 fixed thresholds have at least one qualifying day at Seventeen Seventy.
34 years with a qualifying day
Days at or above 30 C (86 F) per year at Seventeen Seventy Days per year at Seventeen Seventy with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 106 in 2025. 0501001501987: 271988: 71989: 31991: 111992: 321993: 171994: 221995: 191996: 251997: 251998: 561999: 152000: 22001: 412002: 522003: 142004: 462005: 532006: 492007: 352008: 272009: 542010: 412011: 272015: 632016: 402017: 732018: 532019: 942022: 452023: 992024: 1042025: 1062026: 47198719921996200020042008201520192025
Days per year at Seventeen Seventy with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 106 in 2025.
Days at or above 30 C (86 F) per year at Seventeen Seventy
YearDaysDecade average
19872712.3
1988712.3
1989312.3
19911124.7
19923224.7
19931724.7
19942224.7
19951924.7
19962524.7
19972524.7
19985624.7
19991524.7
2000237.3
20014137.3
20025237.3
20031437.3
20044637.3
20055337.3
20064937.3
20073537.3
20082737.3
20095437.3
20104155.9
20112755.9
20156355.9
20164055.9
20177355.9
20185355.9
20199455.9
20224580.2
20239980.2
202410480.2
202510680.2
20264780.2
First to last qualifying date each year at Seventeen Seventy For each year, a bar from the first to the last day at Seventeen Seventy meeting 30 C (86 F). 1987: 11 January 1987 to 30 December 19871988: 18 January 1988 to 24 November 19881989: 12 January 1989 to 20 September 19891991: 22 January 1991 to 31 December 19911992: 5 January 1992 to 29 December 19921993: 24 January 1993 to 31 December 19931994: 3 January 1994 to 31 December 19941995: 2 January 1995 to 21 December 19951996: 11 January 1996 to 8 November 19961997: 30 January 1997 to 27 December 19971998: 9 January 1998 to 30 December 19981999: 10 January 1999 to 6 April 19992000: 23 January 2000 to 26 December 20002001: 26 January 2001 to 31 December 20012002: 1 January 2002 to 14 December 20022003: 28 January 2003 to 27 December 20032004: 7 January 2004 to 25 December 20042005: 3 January 2005 to 31 December 20052006: 2 January 2006 to 26 December 20062007: 10 January 2007 to 23 December 20072008: 6 January 2008 to 31 December 20082009: 1 January 2009 to 31 December 20092010: 1 January 2010 to 18 December 20102011: 11 January 2011 to 27 December 20112015: 1 January 2015 to 27 December 20152016: 1 January 2016 to 31 December 20162017: 1 January 2017 to 31 December 20172018: 1 January 2018 to 31 December 20182019: 1 January 2019 to 29 December 20192022: 2 January 2022 to 29 December 20222023: 1 January 2023 to 31 December 20232024: 1 January 2024 to 31 December 20242025: 1 January 2025 to 31 December 20252026: 2 January 2026 to 12 April 20261987199319982003200820162023JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Seventeen Seventy meeting 30 C (86 F).
First to last qualifying date each year at Seventeen Seventy
YearFirst dateLast date
19871987-01-111987-12-30
19881988-01-181988-11-24
19891989-01-121989-09-20
19911991-01-221991-12-31
19921992-01-051992-12-29
19931993-01-241993-12-31
19941994-01-031994-12-31
19951995-01-021995-12-21
19961996-01-111996-11-08
19971997-01-301997-12-27
19981998-01-091998-12-30
19991999-01-101999-04-06
20002000-01-232000-12-26
20012001-01-262001-12-31
20022002-01-012002-12-14
20032003-01-282003-12-27
20042004-01-072004-12-25
20052005-01-032005-12-31
20062006-01-022006-12-26
20072007-01-102007-12-23
20082008-01-062008-12-31
20092009-01-012009-12-31
20102010-01-012010-12-18
20112011-01-112011-12-27
20152015-01-012015-12-27
20162016-01-012016-12-31
20172017-01-012017-12-31
20182018-01-012018-12-31
20192019-01-012019-12-29
20222022-01-022022-12-29
20232023-01-012023-12-31
20242024-01-012024-12-31
20252025-01-012025-12-31
20262026-01-022026-04-12

Every Fixed Threshold

Fixed thresholds at Seventeen Seventy
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days34106202547
90 F (32.2 C): Days1925202516
20 C (68 F): Tropical nights (min331842025111
25 C (77 F): Days with min3331200512
10 mm (0.39 in): Days with 10 mm or more rain3847198915
25 mm (0.98 in): Days with 25 mm or more rain382619895
50 mm (1.97 in): Days with 50 mm or more rain381320222
100 mm (3.94 in): Days with 100 mm or more rain18319881
200 mm (7.87 in): Days with 200 mm or more rain4119881

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1987.

Download the Data

  • Data for Seventeen Seventy 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).