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Built 2026-10-19 (19 October 2026)

Harvard Wwtp Threshold Days by Year (USC00113902)

5 fixed thresholds counted per year at Harvard Wwtp (USC00113902): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Harvard Wwtp Thresholds

  • Harvard Wwtp: days with 10 mm (0.39 in) or more of precipitation in 36 years, most in 2019 with 48.
  • Harvard Wwtp: days with 25 mm (0.98 in) or more of precipitation in 36 years, most in 2009 with 14.
  • Harvard Wwtp: days with 50 mm (1.97 in) or more of precipitation in 28 years, most in 2000 with 4.
  • Harvard Wwtp: days with 10 cm (3.9 in) or more of snowfall in 24 years, most in 1994 with 6.
  • 5 fixed thresholds have at least one qualifying day at Harvard Wwtp.
36 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Harvard Wwtp Days per year at Harvard Wwtp with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 48 in 2019. 02040601991: 331992: 371993: 371994: 261995: 221996: 251997: 251998: 311999: 292000: 272001: 332002: 182003: 242004: 252005: 202006: 342007: 302008: 362009: 362010: 232011: 372012: 272013: 352014: 302015: 392016: 342017: 332018: 382019: 482020: 302021: 192022: 272023: 282024: 312025: 282026: 22199119951999200320072011201520192023
Days per year at Harvard Wwtp with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 48 in 2019.
Days with 10 mm (0.39 in) or more of precipitation per year at Harvard Wwtp
YearDaysDecade average
19913329.4
19923729.4
19933729.4
19942629.4
19952229.4
19962529.4
19972529.4
19983129.4
19992929.4
20002728.3
20013328.3
20021828.3
20032428.3
20042528.3
20052028.3
20063428.3
20073028.3
20083628.3
20093628.3
20102334.4
20113734.4
20122734.4
20133534.4
20143034.4
20153934.4
20163434.4
20173334.4
20183834.4
20194834.4
20203026.4
20211926.4
20222726.4
20232826.4
20243126.4
20252826.4
20262226.4
First to last qualifying date each year at Harvard Wwtp For each year, a bar from the first to the last day at Harvard Wwtp meeting 10 mm (0.39 in). 1991: 2 March 1991 to 21 December 19911992: 15 February 1992 to 31 December 19921993: 4 January 1993 to 26 November 19931994: 27 January 1994 to 7 December 19941995: 14 January 1995 to 28 November 19951996: 27 February 1996 to 11 December 19961997: 21 February 1997 to 6 November 19971998: 9 January 1998 to 7 December 19981999: 3 January 1999 to 5 December 19992000: 20 March 2000 to 10 November 20002001: 30 January 2001 to 25 November 20012002: 3 March 2002 to 19 December 20022003: 29 March 2003 to 10 December 20032004: 5 March 2004 to 2 November 20042005: 14 February 2005 to 30 December 20052006: 2 January 2006 to 23 December 20062007: 25 February 2007 to 15 December 20072008: 17 February 2008 to 28 December 20082009: 4 January 2009 to 26 December 20092010: 12 March 2010 to 10 December 20102011: 18 January 2011 to 31 December 20112012: 11 February 2012 to 21 December 20122013: 11 January 2013 to 23 December 20132014: 11 January 2014 to 25 November 20142015: 25 March 2015 to 29 December 20152016: 3 February 2016 to 17 December 20162017: 10 January 2017 to 30 December 20172018: 22 January 2018 to 28 December 20182019: 1 January 2019 to 31 December 20192020: 11 January 2020 to 30 December 20202021: 2 January 2021 to 27 December 20212022: 19 March 2022 to 15 December 20222023: 29 January 2023 to 23 December 20232024: 13 January 2024 to 19 November 20242025: 31 January 2025 to 29 December 20252026: 10 January 2026 to 20 September 202619911996200120062011201620212026JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Harvard Wwtp meeting 10 mm (0.39 in).
First to last qualifying date each year at Harvard Wwtp
YearFirst dateLast date
19911991-03-021991-12-21
19921992-02-151992-12-31
19931993-01-041993-11-26
19941994-01-271994-12-07
19951995-01-141995-11-28
19961996-02-271996-12-11
19971997-02-211997-11-06
19981998-01-091998-12-07
19991999-01-031999-12-05
20002000-03-202000-11-10
20012001-01-302001-11-25
20022002-03-032002-12-19
20032003-03-292003-12-10
20042004-03-052004-11-02
20052005-02-142005-12-30
20062006-01-022006-12-23
20072007-02-252007-12-15
20082008-02-172008-12-28
20092009-01-042009-12-26
20102010-03-122010-12-10
20112011-01-182011-12-31
20122012-02-112012-12-21
20132013-01-112013-12-23
20142014-01-112014-11-25
20152015-03-252015-12-29
20162016-02-032016-12-17
20172017-01-102017-12-30
20182018-01-222018-12-28
20192019-01-012019-12-31
20202020-01-112020-12-30
20212021-01-022021-12-27
20222022-03-192022-12-15
20232023-01-292023-12-23
20242024-01-132024-11-19
20252025-01-312025-12-29
20262026-01-102026-09-20

Every Fixed Threshold

Fixed thresholds at Harvard Wwtp
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain3648201922
25 mm (0.98 in): Days with 25 mm or more rain3614200913
50 mm (1.97 in): Days with 50 mm or more rain28420002
100 mm (3.94 in): Days with 100 mm or more rain4120001
10 cm (3.9 in): Days with 10 cm or more snowfall24619941

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1991.

Download the Data

  • Data for Harvard Wwtp 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).