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Built 2026-10-17 (17 October 2026)

Sea Mtn 12.15 Threshold Days by Year

10 fixed thresholds counted per year at Sea Mtn 12.15 (USC00518600): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Sea Mtn 12.15 Thresholds

  • Sea Mtn 12.15: days with 10 mm (0.39 in) or more of precipitation in 21 years, most in 1990 with 37.
  • Sea Mtn 12.15: days with 25 mm (0.98 in) or more of precipitation in 21 years, most in 1989 with 18.
  • Sea Mtn 12.15: days with 50 mm (1.97 in) or more of precipitation in 19 years, most in 2006 with 13.
  • Sea Mtn 12.15: days with a maximum temperature at or above 30 C (86 F) in 18 years, most in 1986 with 111.
  • 10 fixed thresholds have at least one qualifying day at Sea Mtn 12.15.
18 years with a qualifying day
Days at or above 30 C (86 F) per year at Sea Mtn 12.15 Days per year at Sea Mtn 12.15 with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 111 in 1986. 0501001501983: 1051984: 261985: 431986: 1111987: 421988: 441989: 71990: 801992: 381993: 161995: 331996: 381997: 231998: 161999: 22006: 292007: 172008: 6198319851987198919921995199719992007
Days per year at Sea Mtn 12.15 with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 111 in 1986.
Days at or above 30 C (86 F) per year at Sea Mtn 12.15
YearDaysDecade average
198310554
19842654
19854354
198611154
19874254
19884454
1989754
19908030.8
19923830.8
19931630.8
19953330.8
19963830.8
19972330.8
19981630.8
1999230.8
20062917.3
20071717.3
2008617.3
First to last qualifying date each year at Sea Mtn 12.15 For each year, a bar from the first to the last day at Sea Mtn 12.15 meeting 30 C (86 F). 1983: 25 January 1983 to 30 December 19831984: 14 January 1984 to 25 November 19841985: 15 January 1985 to 5 November 19851986: 18 January 1986 to 2 December 19861987: 12 January 1987 to 9 December 19871988: 28 May 1988 to 31 October 19881989: 11 July 1989 to 14 September 19891990: 6 May 1990 to 28 October 19901992: 18 February 1992 to 27 October 19921993: 10 January 1993 to 14 November 19931995: 29 January 1995 to 24 October 19951996: 1 May 1996 to 31 December 19961997: 1 January 1997 to 4 November 19971998: 22 July 1998 to 2 October 19981999: 5 August 1999 to 20 October 19992006: 2 July 2006 to 26 November 20062007: 31 January 2007 to 6 December 20072008: 22 July 2008 to 22 September 2008198319861989199319972006JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Sea Mtn 12.15 meeting 30 C (86 F).
First to last qualifying date each year at Sea Mtn 12.15
YearFirst dateLast date
19831983-01-251983-12-30
19841984-01-141984-11-25
19851985-01-151985-11-05
19861986-01-181986-12-02
19871987-01-121987-12-09
19881988-05-281988-10-31
19891989-07-111989-09-14
19901990-05-061990-10-28
19921992-02-181992-10-27
19931993-01-101993-11-14
19951995-01-291995-10-24
19961996-05-011996-12-31
19971997-01-011997-11-04
19981998-07-221998-10-02
19991999-08-051999-10-20
20062006-07-022006-11-26
20072007-01-312007-12-06
20082008-07-222008-09-22

Every Fixed Threshold

Fixed thresholds at Sea Mtn 12.15
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days1811119866
35 C (95 F): Days1119951
90 F (32.2 C): Days111019862
20 C (68 F): Tropical nights (min17219199694
25 C (77 F): Days with min6819831
10 mm (0.39 in): Days with 10 mm or more rain2137199010
25 mm (0.98 in): Days with 25 mm or more rain211819895
50 mm (1.97 in): Days with 50 mm or more rain191320064
100 mm (3.94 in): Days with 100 mm or more rain14419901
200 mm (7.87 in): Days with 200 mm or more rain3219901

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1983.

Download the Data

  • Data for Sea Mtn 12.15 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 2026-10-15 (15 October 2026). Threshold counts are computed by this site.

Data as of . Last revised (2026-10-12).