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Built 2026-10-18 (18 October 2026)

Dartmouth Threshold Days by Year

4 fixed thresholds counted per year at Dartmouth (ASN00061124): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Dartmouth Thresholds

  • Dartmouth: days with 10 mm (0.39 in) or more of precipitation in 39 years, most in 1887 with 34.
  • Dartmouth: days with 25 mm (0.98 in) or more of precipitation in 38 years, most in 1887 with 10.
  • Dartmouth: days with 50 mm (1.97 in) or more of precipitation in 22 years, most in 1904 with 5.
  • Dartmouth: days with 100 mm (3.94 in) or more of precipitation in 2 years, most in 1881 with 1.
  • 4 fixed thresholds have at least one qualifying day at Dartmouth.
39 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Dartmouth Days per year at Dartmouth with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 34 in 1887. 0102030401880: 161881: 221883: 181884: 161885: 191886: 281887: 341888: 81889: 291890: 301891: 221892: 321893: 211894: 161895: 181896: 161897: 151898: 171899: 101900: 171901: 151902: 161903: 241904: 181905: 111906: 111907: 201908: 211909: 251910: 191911: 231912: 161913: 241914: 291915: 141916: 281917: 161918: 111919: 101880188518891893189719011905190919131917
Days per year at Dartmouth with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 34 in 1887.
Days with 10 mm (0.39 in) or more of precipitation per year at Dartmouth
YearDaysDecade average
18801621.1
18812221.1
18831821.1
18841621.1
18851921.1
18862821.1
18873421.1
1888821.1
18892921.1
18903019.7
18912219.7
18923219.7
18932119.7
18941619.7
18951819.7
18961619.7
18971519.7
18981719.7
18991019.7
19001717.8
19011517.8
19021617.8
19032417.8
19041817.8
19051117.8
19061117.8
19072017.8
19082117.8
19092517.8
19101919
19112319
19121619
19132419
19142919
19151419
19162819
19171619
19181119
19191019
First to last qualifying date each year at Dartmouth For each year, a bar from the first to the last day at Dartmouth meeting 10 mm (0.39 in). 1880: 8 January 1880 to 7 December 18801881: 8 January 1881 to 9 December 18811883: 27 January 1883 to 24 December 18831884: 19 April 1884 to 14 December 18841885: 19 January 1885 to 24 December 18851886: 30 January 1886 to 28 December 18861887: 19 January 1887 to 30 December 18871888: 12 February 1888 to 10 October 18881889: 4 January 1889 to 20 December 18891890: 13 January 1890 to 23 December 18901891: 11 January 1891 to 11 December 18911892: 8 January 1892 to 31 December 18921893: 23 January 1893 to 13 December 18931894: 6 January 1894 to 17 December 18941895: 5 January 1895 to 30 December 18951896: 26 January 1896 to 16 December 18961897: 10 January 1897 to 21 December 18971898: 6 January 1898 to 24 December 18981899: 19 January 1899 to 25 August 18991900: 7 March 1900 to 24 December 19001901: 12 January 1901 to 6 December 19011902: 10 January 1902 to 18 December 19021903: 25 March 1903 to 22 December 19031904: 4 January 1904 to 19 December 19041905: 4 March 1905 to 8 December 19051906: 2 March 1906 to 14 November 19061907: 3 January 1907 to 19 December 19071908: 30 January 1908 to 12 December 19081909: 21 January 1909 to 25 December 19091910: 11 January 1910 to 18 December 19101911: 6 January 1911 to 2 December 19111912: 1 January 1912 to 13 December 19121913: 4 January 1913 to 19 December 19131914: 17 January 1914 to 31 December 19141915: 13 January 1915 to 18 December 19151916: 15 January 1916 to 22 December 19161917: 23 January 1917 to 27 December 19171918: 12 January 1918 to 31 October 19181919: 8 January 1919 to 29 December 191918801886189118961901190619111916JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Dartmouth meeting 10 mm (0.39 in).
First to last qualifying date each year at Dartmouth
YearFirst dateLast date
18801880-01-081880-12-07
18811881-01-081881-12-09
18831883-01-271883-12-24
18841884-04-191884-12-14
18851885-01-191885-12-24
18861886-01-301886-12-28
18871887-01-191887-12-30
18881888-02-121888-10-10
18891889-01-041889-12-20
18901890-01-131890-12-23
18911891-01-111891-12-11
18921892-01-081892-12-31
18931893-01-231893-12-13
18941894-01-061894-12-17
18951895-01-051895-12-30
18961896-01-261896-12-16
18971897-01-101897-12-21
18981898-01-061898-12-24
18991899-01-191899-08-25
19001900-03-071900-12-24
19011901-01-121901-12-06
19021902-01-101902-12-18
19031903-03-251903-12-22
19041904-01-041904-12-19
19051905-03-041905-12-08
19061906-03-021906-11-14
19071907-01-031907-12-19
19081908-01-301908-12-12
19091909-01-211909-12-25
19101910-01-111910-12-18
19111911-01-061911-12-02
19121912-01-011912-12-13
19131913-01-041913-12-19
19141914-01-171914-12-31
19151915-01-131915-12-18
19161916-01-151916-12-22
19171917-01-231917-12-27
19181918-01-121918-10-31
19191919-01-081919-12-29

Every Fixed Threshold

Fixed thresholds at Dartmouth
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain3934188710
25 mm (0.98 in): Days with 25 mm or more rain381018873
50 mm (1.97 in): Days with 50 mm or more rain22519041
100 mm (3.94 in): Days with 100 mm or more rain2118811

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1880.

Download the Data

  • Data for Dartmouth 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 (2025-12-31).