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Built 2026-10-19 (19 October 2026)

Dorchester Threshold Days by Year (USC00132311)

6 fixed thresholds counted per year at Dorchester (USC00132311): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Dorchester Thresholds

  • Dorchester: days with 10 mm (0.39 in) or more of precipitation in 50 years, most in 2007 with 45.
  • Dorchester: days with 25 mm (0.98 in) or more of precipitation in 50 years, most in 1950 with 15.
  • Dorchester: days with 10 cm (3.9 in) or more of snowfall in 46 years, most in 1985 with 10.
  • Dorchester: days with 50 mm (1.97 in) or more of precipitation in 41 years, most in 1950 with 5.
  • 6 fixed thresholds have at least one qualifying day at Dorchester.
50 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Dorchester Days per year at Dorchester with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 45 in 2007. 02040601949: 131950: 301954: 261955: 251956: 291957: 321958: 141959: 261960: 351961: 261963: 201964: 151969: 211970: 341972: 401973: 391974: 341975: 271976: 201977: 291978: 291979: 351980: 281981: 291983: 411984: 401986: 331987: 321989: 231990: 291992: 241993: 311994: 241995: 341996: 251997: 271998: 361999: 262000: 212001: 252002: 192003: 192004: 342005: 282006: 242007: 452008: 332010: 352011: 232012: 281949195719631973197819841992199720022007
Days per year at Dorchester with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 45 in 2007.
Days with 10 mm (0.39 in) or more of precipitation per year at Dorchester
YearDaysDecade average
19491313
19503026
19542626
19552526
19562926
19573226
19581426
19592626
19603523.4
19612623.4
19632023.4
19641523.4
19692123.4
19703431.9
19724031.9
19733931.9
19743431.9
19752731.9
19762031.9
19772931.9
19782931.9
19793531.9
19802832.3
19812932.3
19834132.3
19844032.3
19863332.3
19873232.3
19892332.3
19902928.4
19922428.4
19933128.4
19942428.4
19953428.4
19962528.4
19972728.4
19983628.4
19992628.4
20002127.6
20012527.6
20021927.6
20031927.6
20043427.6
20052827.6
20062427.6
20074527.6
20083327.6
20103528.7
20112328.7
20122828.7
First to last qualifying date each year at Dorchester For each year, a bar from the first to the last day at Dorchester meeting 10 mm (0.39 in). 1949: 28 January 1949 to 11 September 19491950: 25 January 1950 to 7 December 19501954: 25 March 1954 to 24 November 19541955: 21 March 1955 to 24 October 19551956: 24 February 1956 to 5 December 19561957: 19 March 1957 to 19 November 19571958: 6 April 1958 to 18 November 19581959: 23 February 1959 to 28 December 19591960: 12 January 1960 to 5 December 19601961: 18 February 1961 to 17 December 19611963: 12 January 1963 to 22 November 19631964: 25 March 1964 to 18 September 19641969: 15 January 1969 to 28 December 19691970: 3 March 1970 to 11 December 19701972: 2 March 1972 to 30 December 19721973: 4 January 1973 to 25 December 19731974: 22 February 1974 to 16 December 19741975: 3 January 1975 to 14 December 19751976: 15 February 1976 to 20 September 19761977: 8 January 1977 to 23 November 19771978: 4 April 1978 to 30 December 19781979: 23 January 1979 to 23 December 19791980: 7 January 1980 to 24 October 19801981: 22 February 1981 to 1 December 19811983: 2 February 1983 to 28 November 19831984: 12 February 1984 to 24 December 19841986: 5 February 1986 to 20 November 19861987: 1 March 1987 to 28 December 19871989: 3 March 1989 to 28 November 19891990: 21 January 1990 to 21 October 19901992: 9 March 1992 to 26 November 19921993: 13 January 1993 to 16 October 19931994: 27 January 1994 to 28 November 19941995: 7 March 1995 to 12 December 19951996: 18 January 1996 to 24 December 19961997: 5 January 1997 to 13 October 19971998: 3 January 1998 to 21 December 19981999: 22 January 1999 to 26 November 19992000: 25 March 2000 to 7 November 20002001: 30 January 2001 to 14 October 20012002: 20 February 2002 to 4 October 20022003: 28 March 2003 to 18 November 20032004: 5 March 2004 to 6 December 20042005: 2 January 2005 to 27 November 20052006: 6 March 2006 to 21 December 20062007: 1 January 2007 to 24 December 20072008: 15 February 2008 to 21 December 20082010: 6 April 2010 to 25 December 20102011: 21 February 2011 to 4 December 20112012: 29 February 2012 to 20 December 201219491959197219791989199720042012JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Dorchester meeting 10 mm (0.39 in).
First to last qualifying date each year at Dorchester
YearFirst dateLast date
19491949-01-281949-09-11
19501950-01-251950-12-07
19541954-03-251954-11-24
19551955-03-211955-10-24
19561956-02-241956-12-05
19571957-03-191957-11-19
19581958-04-061958-11-18
19591959-02-231959-12-28
19601960-01-121960-12-05
19611961-02-181961-12-17
19631963-01-121963-11-22
19641964-03-251964-09-18
19691969-01-151969-12-28
19701970-03-031970-12-11
19721972-03-021972-12-30
19731973-01-041973-12-25
19741974-02-221974-12-16
19751975-01-031975-12-14
19761976-02-151976-09-20
19771977-01-081977-11-23
19781978-04-041978-12-30
19791979-01-231979-12-23
19801980-01-071980-10-24
19811981-02-221981-12-01
19831983-02-021983-11-28
19841984-02-121984-12-24
19861986-02-051986-11-20
19871987-03-011987-12-28
19891989-03-031989-11-28
19901990-01-211990-10-21
19921992-03-091992-11-26
19931993-01-131993-10-16
19941994-01-271994-11-28
19951995-03-071995-12-12
19961996-01-181996-12-24
19971997-01-051997-10-13
19981998-01-031998-12-21
19991999-01-221999-11-26
20002000-03-252000-11-07
20012001-01-302001-10-14
20022002-02-202002-10-04
20032003-03-282003-11-18
20042004-03-052004-12-06
20052005-01-022005-11-27
20062006-03-062006-12-21
20072007-01-012007-12-24
20082008-02-152008-12-21
20102010-04-062010-12-25
20112011-02-212011-12-04
20122012-02-292012-12-20

Every Fixed Threshold

Fixed thresholds at Dorchester
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain5045200728
25 mm (0.98 in): Days with 25 mm or more rain501519507
50 mm (1.97 in): Days with 50 mm or more rain41519501
100 mm (3.94 in): Days with 100 mm or more rain7119641
10 cm (3.9 in): Days with 10 cm or more snowfall461019851
25 cm (9.8 in): Days with 25 cm or more snowfall7219591

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1949.

Download the Data

  • Data for Dorchester 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).