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Built 2026-10-19 (19 October 2026)

Days with 50 mm (1.97 in) or more of precipitation in Boston

Boston has had days with 50 mm (1.97 in) or more of precipitation in 74 years, most in 1954 with 5. Days per year, season span, streaks and every date.

Key Facts for Boston

  • Boston has had days with 50 mm (1.97 in) or more of precipitation in 74 years, 154 days in all.
  • The most in one year was 5 days in 1954.
  • In 2025, the latest year on file, there were 1 such days.
  • The earliest first date in a year was 2 January 1987.
  • The latest last date in a year was 26 December 1969.
  • The longest run inside a single year was 2 days in 1944.
  • 1 year with under 90 percent of days observed is left out of these rankings.

Days per Year

74 years, 154 days
Days with 50 mm (1.97 in) or more of precipitation per year in Boston Days per year in Boston with 50 mm (1.97 in) or more of precipitation. The line is the decade average. The most was 5 in 1954. Grey bars are years with under 90 percent of days observed, left out of rankings. 02461936: 11937: 21938: 11939: 11943: 11944: 41945: 21946: 21947: 21949: 11950: 11952: 11953: 41954: 51955: 51956: 11958: 31959: 11960: 41961: 31962: 41963: 11967: 21968: 21969: 31970: 11971: 11972: 21973: 11974: 21975: 21976: 21977: 11978: 11979: 21981: 11982: 31983: 31984: 21985: 21986: 11987: 31988: 21989: 11990: 31991: 31992: 21993: 11994: 31995: 11996: 21998: 31999: 22000: 22001: 32002: 12003: 12004: 32005: 22006: 42007: 12008: 32009: 12010: 52013: 12014: 32015: 12017: 12018: 22019: 12021: 22023: 32024: 32025: 119361950196219751986199620072021
Days per year in Boston with 50 mm (1.97 in) or more of precipitation. The line is the decade average. The most was 5 in 1954. Grey bars are years with under 90 percent of days observed, left out of rankings.
Days with 50 mm (1.97 in) or more of precipitation per year in Boston
YearDaysDecade average
193611.3
193721.3
193811.3
193911.3
194312
194442
194522
194622
194722
194912
195012.6
195212.6
195342.6
195452.6
195552.6
195612.6
195832.6
195912.6
196042.7
196132.7
196242.7
196312.7
196722.7
196822.7
196932.7
197011.5
197111.5
197221.5
197311.5
197421.5
197521.5
197621.5
197711.5
197811.5
197921.5
198112
198232
198332
198422
198522
198612
198732
198822
198912
199032.2
199132.2
199222.2
199312.2
199432.2
199512.2
199622.2
199832.2
199922.2
200022.1
200132.1
200212.1
200312.1
200432.1
200522.1
200642.1
200712.1
200832.1
200912.1
201052
201312
201432
201512
201712
201822
201912
202122.3
202332.3
202432.3
202512.3

Season Span

earliest 2 January, latest 26 December
First to last qualifying date each year in Boston For each year, a bar from the first to the last day in Boston meeting 50 mm (1.97 in). Long bars mean a long season. 1936: 18 September 1936 to 18 September 19361937: 28 November 1937 to 6 December 19371938: 21 July 1938 to 21 July 19381939: 31 October 1939 to 31 October 19391943: 6 March 1943 to 6 March 19431944: 24 June 1944 to 30 November 19441945: 20 June 1945 to 6 December 19451946: 2 August 1946 to 27 August 19461947: 2 September 1947 to 12 November 19471949: 1 September 1949 to 1 September 19491950: 21 November 1950 to 21 November 19501952: 5 August 1952 to 5 August 19521953: 30 March 1953 to 25 November 19531954: 17 April 1954 to 11 September 19541955: 10 July 1955 to 4 November 19551956: 23 October 1956 to 23 October 19561958: 16 February 1958 to 17 September 19581959: 11 July 1959 to 11 July 19591960: 4 June 1960 to 20 September 19601961: 4 February 1961 to 25 September 19611962: 1 April 1962 to 7 October 19621963: 29 November 1963 to 29 November 19631967: 25 May 1967 to 6 August 19671968: 18 March 1968 to 4 December 19681969: 24 February 1969 to 26 December 19691970: 17 December 1970 to 17 December 19701971: 25 November 1971 to 25 November 19711972: 19 February 1972 to 3 September 19721973: 17 December 1973 to 17 December 19731974: 21 March 1974 to 16 October 19741975: 30 August 1975 to 18 October 19751976: 30 July 1976 to 9 August 19761977: 9 May 1977 to 9 May 19771978: 20 January 1978 to 20 January 19781979: 21 January 1979 to 25 January 19791981: 25 February 1981 to 25 February 19811982: 2 June 1982 to 6 June 19821983: 2 March 1983 to 25 November 19831984: 31 May 1984 to 2 October 19841985: 1 August 1985 to 5 November 19851986: 6 June 1986 to 6 June 19861987: 2 January 1987 to 13 September 19871988: 24 July 1988 to 20 November 19881989: 13 August 1989 to 13 August 19891990: 3 April 1990 to 14 October 19901991: 21 April 1991 to 25 September 19911992: 23 November 1992 to 12 December 19921993: 5 December 1993 to 5 December 19931994: 10 March 1994 to 23 September 19941995: 17 September 1995 to 17 September 19951996: 13 July 1996 to 20 October 19961998: 24 February 1998 to 13 June 19981999: 10 September 1999 to 16 September 19992000: 6 June 2000 to 17 December 20002001: 22 March 2001 to 17 June 20012002: 14 December 2002 to 14 December 20022003: 12 October 2003 to 12 October 20032004: 1 April 2004 to 18 September 20042005: 6 July 2005 to 15 October 20052006: 13 May 2006 to 28 October 20062007: 28 July 2007 to 28 July 20072008: 13 February 2008 to 12 December 20082009: 12 September 2009 to 12 September 20092010: 14 March 2010 to 25 August 20102013: 7 June 2013 to 7 June 20132014: 30 March 2014 to 9 December 20142015: 30 September 2015 to 30 September 20152017: 16 June 2017 to 16 June 20172018: 2 March 2018 to 17 July 20182019: 22 April 2019 to 22 April 20192021: 9 July 2021 to 2 September 20212023: 14 March 2023 to 29 July 20232024: 23 March 2024 to 11 December 20242025: 22 May 2025 to 22 May 202519361950196219751986199620072021JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day in Boston meeting 50 mm (1.97 in). Long bars mean a long season.
First to last qualifying date each year in Boston
YearFirst dateLast date
19361936-09-181936-09-18
19371937-11-281937-12-06
19381938-07-211938-07-21
19391939-10-311939-10-31
19431943-03-061943-03-06
19441944-06-241944-11-30
19451945-06-201945-12-06
19461946-08-021946-08-27
19471947-09-021947-11-12
19491949-09-011949-09-01
19501950-11-211950-11-21
19521952-08-051952-08-05
19531953-03-301953-11-25
19541954-04-171954-09-11
19551955-07-101955-11-04
19561956-10-231956-10-23
19581958-02-161958-09-17
19591959-07-111959-07-11
19601960-06-041960-09-20
19611961-02-041961-09-25
19621962-04-011962-10-07
19631963-11-291963-11-29
19671967-05-251967-08-06
19681968-03-181968-12-04
19691969-02-241969-12-26
19701970-12-171970-12-17
19711971-11-251971-11-25
19721972-02-191972-09-03
19731973-12-171973-12-17
19741974-03-211974-10-16
19751975-08-301975-10-18
19761976-07-301976-08-09
19771977-05-091977-05-09
19781978-01-201978-01-20
19791979-01-211979-01-25
19811981-02-251981-02-25
19821982-06-021982-06-06
19831983-03-021983-11-25
19841984-05-311984-10-02
19851985-08-011985-11-05
19861986-06-061986-06-06
19871987-01-021987-09-13
19881988-07-241988-11-20
19891989-08-131989-08-13
19901990-04-031990-10-14
19911991-04-211991-09-25
19921992-11-231992-12-12
19931993-12-051993-12-05
19941994-03-101994-09-23
19951995-09-171995-09-17
19961996-07-131996-10-20
19981998-02-241998-06-13
19991999-09-101999-09-16
20002000-06-062000-12-17
20012001-03-222001-06-17
20022002-12-142002-12-14
20032003-10-122003-10-12
20042004-04-012004-09-18
20052005-07-062005-10-15
20062006-05-132006-10-28
20072007-07-282007-07-28
20082008-02-132008-12-12
20092009-09-122009-09-12
20102010-03-142010-08-25
20132013-06-072013-06-07
20142014-03-302014-12-09
20152015-09-302015-09-30
20172017-06-162017-06-16
20182018-03-022018-07-17
20192019-04-222019-04-22
20212021-07-092021-09-02
20232023-03-142023-07-29
20242024-03-232024-12-11
20252025-05-222025-05-22

Every Year

Days with 50 mm (1.97 in) or more of precipitation per year in Boston
YearDaysFirst dateLast dateLongest streak in yearCoverage
2025122 May 202522 May 20251 daysComplete
2024323 March 202411 December 20241 daysComplete
2023314 March 202329 July 20231 daysComplete
202129 July 20212 September 20211 daysComplete
2019122 April 201922 April 20191 daysComplete
201822 March 201817 July 20181 daysComplete
2017116 June 201716 June 20171 daysComplete
2015130 September 201530 September 20151 daysComplete
2014330 March 20149 December 20141 daysComplete
201317 June 20137 June 20131 daysComplete
2010514 March 201025 August 20102 daysComplete
2009112 September 200912 September 20091 daysComplete
2008313 February 200812 December 20081 daysComplete
2007128 July 200728 July 20071 daysComplete
2006413 May 200628 October 20062 daysComplete
200526 July 200515 October 20051 daysComplete
200431 April 200418 September 20041 daysComplete
2003112 October 200312 October 20031 daysComplete
2002114 December 200214 December 20021 daysComplete
2001322 March 200117 June 20011 daysComplete
200026 June 200017 December 20001 daysComplete
1999210 September 199916 September 19991 daysComplete
1998324 February 199813 June 19981 daysComplete
1996213 July 199620 October 19961 daysComplete
1995117 September 199517 September 19951 daysComplete
1994310 March 199423 September 19941 daysComplete
199315 December 19935 December 19931 daysComplete
1992223 November 199212 December 19921 daysComplete
1991321 April 199125 September 19911 daysComplete
199033 April 199014 October 19901 daysComplete
1989113 August 198913 August 19891 daysComplete
1988224 July 198820 November 19881 daysComplete
198732 January 198713 September 19871 daysComplete
198616 June 19866 June 19861 daysComplete
198521 August 19855 November 19851 daysComplete
1984231 May 19842 October 19841 daysComplete
198332 March 198325 November 19831 daysComplete
198232 June 19826 June 19822 daysComplete
1981125 February 198125 February 19811 daysComplete
1979221 January 197925 January 19791 daysComplete
1978120 January 197820 January 19781 daysComplete
197719 May 19779 May 19771 daysComplete
1976230 July 19769 August 19761 daysComplete
1975230 August 197518 October 19751 daysComplete
1974221 March 197416 October 19741 daysComplete
1973117 December 197317 December 19731 daysComplete
1972219 February 19723 September 19721 daysComplete
1971125 November 197125 November 19711 daysComplete
1970117 December 197017 December 19701 daysComplete
1969324 February 196926 December 19691 daysComplete
1968218 March 19684 December 19681 daysComplete
1967225 May 19676 August 19671 daysComplete
1963129 November 196329 November 19631 daysComplete
196241 April 19627 October 19622 daysComplete
196134 February 196125 September 19611 daysComplete
196044 June 196020 September 19601 daysComplete
1959111 July 195911 July 19591 daysComplete
1958316 February 195817 September 19581 daysComplete
1956123 October 195623 October 19561 daysComplete
1955510 July 19554 November 19552 daysComplete
1954517 April 195411 September 19541 daysComplete
1953430 March 195325 November 19531 daysComplete
195215 August 19525 August 19521 daysComplete
1950121 November 195021 November 19501 daysComplete
194911 September 19491 September 19491 daysComplete
194722 September 194712 November 19471 daysComplete
194622 August 194627 August 19461 daysComplete
1945220 June 19456 December 19451 daysComplete
1944424 June 194430 November 19442 daysComplete
194316 March 19436 March 19431 daysComplete
1939131 October 193931 October 19391 daysComplete
1938121 July 193821 July 19381 daysComplete
1937228 November 19376 December 19371 daysComplete
1936118 September 193618 September 19361 daysComplete
Decade averages for Days with 50 mm (1.97 in) or more of precipitation in Boston
DecadeAverage days per yearYears counted
1930s1.34
1940s2.06
1950s2.68
1960s2.77
1970s1.510
1980s2.09
1990s2.29
2000s2.110
2010s2.07
2020s2.34

Compare with your own threshold in the threshold explorer. Fahrenheit thresholds are converted to tenths of a degree Celsius once, rounding half up.

Download the Data

  • Data for Days with 50 mm (1.97 in) or more of precipitation in Boston, 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 from the threaded city record.

Data as of . Last revised (2026-10-17).