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Dartmouth Reservoir Threshold Days by Year

12 fixed thresholds counted per year at Dartmouth Reservoir (ASN00082076): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Dartmouth Reservoir Thresholds

  • Dartmouth Reservoir: days with 10 mm (0.39 in) or more of precipitation in 70 years, most in 1996 with 51.
  • Dartmouth Reservoir: days with 25 mm (0.98 in) or more of precipitation in 70 years, most in 2016 with 17.
  • Dartmouth Reservoir: days with 50 mm (1.97 in) or more of precipitation in 48 years, most in 2010 with 4.
  • Dartmouth Reservoir: days with a maximum temperature at or above 30 C (86 F) in 35 years, most in 2009 with 69.
  • 12 fixed thresholds have at least one qualifying day at Dartmouth Reservoir.
35 years with a qualifying day
Days at or above 30 C (86 F) per year at Dartmouth Reservoir Days per year at Dartmouth Reservoir with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 69 in 2009. 0204060801976: 301978: 461980: 511981: 511982: 641983: 631984: 181985: 381986: 351987: 341988: 431989: 371990: 451991: 441992: 131993: 211994: 341995: 211996: 151997: 481999: 392000: 402001: 442002: 362008: 422009: 692010: 362011: 202012: 302014: 532015: 492016: 522018: 502019: 652026: 32197619821986199019941999200820122018
Days per year at Dartmouth Reservoir with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 69 in 2009.
Days at or above 30 C (86 F) per year at Dartmouth Reservoir
YearDaysDecade average
19763038
19784638
19805143.4
19815143.4
19826443.4
19836343.4
19841843.4
19853843.4
19863543.4
19873443.4
19884343.4
19893743.4
19904531.1
19914431.1
19921331.1
19932131.1
19943431.1
19952131.1
19961531.1
19974831.1
19993931.1
20004046.2
20014446.2
20023646.2
20084246.2
20096946.2
20103644.4
20112044.4
20123044.4
20145344.4
20154944.4
20165244.4
20185044.4
20196544.4
20263232
First to last qualifying date each year at Dartmouth Reservoir For each year, a bar from the first to the last day at Dartmouth Reservoir meeting 30 C (86 F). 1976: 4 January 1976 to 30 December 19761978: 2 January 1978 to 26 December 19781980: 6 January 1980 to 31 December 19801981: 1 January 1981 to 31 December 19811982: 5 January 1982 to 31 December 19821983: 1 January 1983 to 30 December 19831984: 11 January 1984 to 25 December 19841985: 12 January 1985 to 13 April 19851986: 7 January 1986 to 30 December 19861987: 1 January 1987 to 31 December 19871988: 5 January 1988 to 18 December 19881989: 8 January 1989 to 30 December 19891990: 1 January 1990 to 31 December 19901991: 1 January 1991 to 27 December 19911992: 20 January 1992 to 12 December 19921993: 1 January 1993 to 20 December 19931994: 2 January 1994 to 31 December 19941995: 1 January 1995 to 31 December 19951996: 13 January 1996 to 28 December 19961997: 3 January 1997 to 31 December 19971999: 1 January 1999 to 15 December 19992000: 11 January 2000 to 31 December 20002001: 1 January 2001 to 30 December 20012002: 6 January 2002 to 29 December 20022008: 1 January 2008 to 28 December 20082009: 4 January 2009 to 31 December 20092010: 5 January 2010 to 31 December 20102011: 1 January 2011 to 31 December 20112012: 1 January 2012 to 31 December 20122014: 10 January 2014 to 22 December 20142015: 1 January 2015 to 31 December 20152016: 1 January 2016 to 31 December 20162018: 4 January 2018 to 30 December 20182019: 1 January 2019 to 31 December 20192026: 2 January 2026 to 11 March 20261976198319881993199920092015JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Dartmouth Reservoir meeting 30 C (86 F).
First to last qualifying date each year at Dartmouth Reservoir
YearFirst dateLast date
19761976-01-041976-12-30
19781978-01-021978-12-26
19801980-01-061980-12-31
19811981-01-011981-12-31
19821982-01-051982-12-31
19831983-01-011983-12-30
19841984-01-111984-12-25
19851985-01-121985-04-13
19861986-01-071986-12-30
19871987-01-011987-12-31
19881988-01-051988-12-18
19891989-01-081989-12-30
19901990-01-011990-12-31
19911991-01-011991-12-27
19921992-01-201992-12-12
19931993-01-011993-12-20
19941994-01-021994-12-31
19951995-01-011995-12-31
19961996-01-131996-12-28
19971997-01-031997-12-31
19991999-01-011999-12-15
20002000-01-112000-12-31
20012001-01-012001-12-30
20022002-01-062002-12-29
20082008-01-012008-12-28
20092009-01-042009-12-31
20102010-01-052010-12-31
20112011-01-012011-12-31
20122012-01-012012-12-31
20142014-01-102014-12-22
20152015-01-012015-12-31
20162016-01-012016-12-31
20182018-01-042018-12-30
20192019-01-012019-12-31
20262026-01-022026-03-11

Every Fixed Threshold

Fixed thresholds at Dartmouth Reservoir
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days3569200932
35 C (95 F): Days312920197
40 C (104 F): Days5420091
90 F (32.2 C): Days3548198319
100 F (37.8 C): Days181020094
0 C (32 F): Frost days (min335219828
20 C (68 F): Tropical nights (min161020193
25 C (77 F): Days with min1120191
10 mm (0.39 in): Days with 10 mm or more rain7051199625
25 mm (0.98 in): Days with 25 mm or more rain701720167
50 mm (1.97 in): Days with 50 mm or more rain48420102
100 mm (3.94 in): Days with 100 mm or more rain1119271

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1976.

Download the Data

  • Data for Dartmouth Reservoir 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).