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Built 2026-10-19 (19 October 2026)

New Boston Dam 17 Threshold Days by Year (USC00116080)

18 fixed thresholds counted per year at New Boston Dam 17 (USC00116080): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for New Boston Dam 17 Thresholds

  • New Boston Dam 17: days with 10 mm (0.39 in) or more of precipitation in 84 years, most in 1973 with 47.
  • New Boston Dam 17: days with 25 mm (0.98 in) or more of precipitation in 84 years, most in 1998 with 16.
  • New Boston Dam 17: days with 50 mm (1.97 in) or more of precipitation in 63 years, most in 1973 with 4.
  • New Boston Dam 17: days with a maximum temperature at or above 30 C (86 F) in 36 years, most in 2007 with 71.
  • 18 fixed thresholds have at least one qualifying day at New Boston Dam 17.
36 years with a qualifying day
Days at or above 30 C (86 F) per year at New Boston Dam 17 Days per year at New Boston Dam 17 with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 71 in 2007. 0204060801940: 511941: 501942: 401943: 531945: 351946: 311947: 451998: 511999: 452000: 412001: 332002: 692003: 552004: 342005: 702006: 542007: 712008: 342009: 212010: 662011: 582012: 632013: 512014: 322015: 382016: 612017: 502018: 572019: 492020: 532021: 602022: 552023: 552024: 502025: 602026: 55194019451999200320072011201520192023
Days per year at New Boston Dam 17 with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 71 in 2007.
Days at or above 30 C (86 F) per year at New Boston Dam 17
YearDaysDecade average
19405143.6
19415043.6
19424043.6
19435343.6
19453543.6
19463143.6
19474543.6
19985148
19994548
20004148.2
20013348.2
20026948.2
20035548.2
20043448.2
20057048.2
20065448.2
20077148.2
20083448.2
20092148.2
20106652.5
20115852.5
20126352.5
20135152.5
20143252.5
20153852.5
20166152.5
20175052.5
20185752.5
20194952.5
20205355.4
20216055.4
20225555.4
20235555.4
20245055.4
20256055.4
20265555.4
First to last qualifying date each year at New Boston Dam 17 For each year, a bar from the first to the last day at New Boston Dam 17 meeting 30 C (86 F). 1940: 13 May 1940 to 21 September 19401941: 15 May 1941 to 23 September 19411942: 30 April 1942 to 18 September 19421943: 5 May 1943 to 5 September 19431945: 24 June 1945 to 16 September 19451946: 7 June 1946 to 9 September 19461947: 9 June 1947 to 19 September 19471998: 15 May 1998 to 27 September 19981999: 29 May 1999 to 12 September 19992000: 12 May 2000 to 19 September 20002001: 17 May 2001 to 4 September 20012002: 16 April 2002 to 30 September 20022003: 28 May 2003 to 19 September 20032004: 17 April 2004 to 15 September 20042005: 11 May 2005 to 14 September 20052006: 25 May 2006 to 4 October 20062007: 30 April 2007 to 8 October 20072008: 2 June 2008 to 3 September 20082009: 23 May 2009 to 12 September 20092010: 24 May 2010 to 10 October 20102011: 10 May 2011 to 13 September 20112012: 25 May 2012 to 13 September 20122013: 15 May 2013 to 3 October 20132014: 22 May 2014 to 29 September 20142015: 6 June 2015 to 18 September 20152016: 25 May 2016 to 18 October 20162017: 16 May 2017 to 26 September 20172018: 25 May 2018 to 4 October 20182019: 7 June 2019 to 2 October 20192020: 26 May 2020 to 7 September 20202021: 25 May 2021 to 1 October 20212022: 11 May 2022 to 21 September 20222023: 8 May 2023 to 4 October 20232024: 20 May 2024 to 13 October 20242025: 11 May 2025 to 4 October 20252026: 22 March 2026 to 14 October 202619401946200120062011201620212026JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at New Boston Dam 17 meeting 30 C (86 F).
First to last qualifying date each year at New Boston Dam 17
YearFirst dateLast date
19401940-05-131940-09-21
19411941-05-151941-09-23
19421942-04-301942-09-18
19431943-05-051943-09-05
19451945-06-241945-09-16
19461946-06-071946-09-09
19471947-06-091947-09-19
19981998-05-151998-09-27
19991999-05-291999-09-12
20002000-05-122000-09-19
20012001-05-172001-09-04
20022002-04-162002-09-30
20032003-05-282003-09-19
20042004-04-172004-09-15
20052005-05-112005-09-14
20062006-05-252006-10-04
20072007-04-302007-10-08
20082008-06-022008-09-03
20092009-05-232009-09-12
20102010-05-242010-10-10
20112011-05-102011-09-13
20122012-05-252012-09-13
20132013-05-152013-10-03
20142014-05-222014-09-29
20152015-06-062015-09-18
20162016-05-252016-10-18
20172017-05-162017-09-26
20182018-05-252018-10-04
20192019-06-072019-10-02
20202020-05-262020-09-07
20212021-05-252021-10-01
20222022-05-112022-09-21
20232023-05-082023-10-04
20242024-05-202024-10-13
20252025-05-112025-10-04
20262026-03-222026-10-14

Every Fixed Threshold

Fixed thresholds at New Boston Dam 17
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days3671200755
35 C (95 F): Days322020127
40 C (104 F): Days2120111
90 F (32.2 C): Days3643200230
100 F (37.8 C): Days10520121
0 C (32 F): Ice days (max3664201026
0 C (32 F): Frost days (min34144201867
-10 C (14 F): Days with min3461201426
-20 C (-4 F): Days with min302120143
-30 C (-22 F): Days with min2220192
20 C (68 F): Tropical nights (min3449201039
25 C (77 F): Days with min18519403
10 mm (0.39 in): Days with 10 mm or more rain8447197328
25 mm (0.98 in): Days with 25 mm or more rain8416199812
50 mm (1.97 in): Days with 50 mm or more rain63419737
100 mm (3.94 in): Days with 100 mm or more rain7119471
10 cm (3.9 in): Days with 10 cm or more snowfall25419511
25 cm (9.8 in): Days with 25 cm or more snowfall1119711

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1940.

Download the Data

  • Data for New Boston Dam 17 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).