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Built 2026-10-19 (19 October 2026)

NWS Boston/Norton Threshold Days by Year (USC00198368)

17 fixed thresholds counted per year at NWS Boston/Norton (USC00198368): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for NWS Boston/Norton Thresholds

  • NWS Boston/Norton: days with a maximum temperature at or above 30 C (86 F) in 32 years, most in 2010 with 57.
  • NWS Boston/Norton: days with a maximum temperature at or above 90 F (32.2 C) in 32 years, most in 2010 with 34.
  • NWS Boston/Norton: days with a maximum temperature at or below 0 C (32 F) in 32 years, most in 2003 with 37.
  • NWS Boston/Norton: nights with a minimum temperature at or below 0 C (32 F) in 32 years, most in 2019 with 143.
  • 17 fixed thresholds have at least one qualifying day at NWS Boston/Norton.
32 years with a qualifying day
Days at or above 30 C (86 F) per year at NWS Boston/Norton Days per year at NWS Boston/Norton with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 57 in 2010. 02040601995: 291996: 191997: 261998: 281999: 442000: 182001: 402002: 422003: 332004: 262005: 522006: 372007: 492008: 382009: 292010: 572011: 432012: 482013: 332014: 322015: 512016: 552017: 442018: 362019: 242020: 352021: 272022: 332023: 182024: 232025: 292026: 2319951999200320072011201520192023
Days per year at NWS Boston/Norton with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 57 in 2010.
Days at or above 30 C (86 F) per year at NWS Boston/Norton
YearDaysDecade average
19952929.2
19961929.2
19972629.2
19982829.2
19994429.2
20001836.4
20014036.4
20024236.4
20033336.4
20042636.4
20055236.4
20063736.4
20074936.4
20083836.4
20092936.4
20105742.3
20114342.3
20124842.3
20133342.3
20143242.3
20155142.3
20165542.3
20174442.3
20183642.3
20192442.3
20203526.9
20212726.9
20223326.9
20231826.9
20242326.9
20252926.9
20262326.9
First to last qualifying date each year at NWS Boston/Norton For each year, a bar from the first to the last day at NWS Boston/Norton meeting 30 C (86 F). 1995: 31 May 1995 to 1 September 19951996: 20 May 1996 to 6 September 19961997: 10 June 1997 to 17 August 19971998: 31 March 1998 to 6 September 19981999: 29 May 1999 to 5 September 19992000: 7 May 2000 to 1 September 20002001: 1 May 2001 to 13 September 20012002: 16 April 2002 to 2 October 20022003: 16 April 2003 to 30 August 20032004: 7 May 2004 to 4 September 20042005: 20 April 2005 to 14 September 20052006: 1 June 2006 to 23 August 20062007: 24 May 2007 to 6 October 20072008: 3 June 2008 to 5 September 20082009: 26 April 2009 to 26 August 20092010: 7 April 2010 to 25 September 20102011: 27 May 2011 to 9 October 20112012: 17 April 2012 to 1 September 20122013: 22 May 2013 to 13 September 20132014: 9 June 2014 to 29 September 20142015: 11 May 2015 to 19 September 20152016: 26 May 2016 to 23 September 20162017: 17 April 2017 to 28 September 20172018: 3 May 2018 to 7 September 20182019: 27 May 2019 to 23 August 20192020: 5 June 2020 to 26 August 20202021: 24 May 2021 to 28 August 20212022: 23 May 2022 to 31 August 20222023: 14 April 2023 to 10 September 20232024: 23 May 2024 to 29 August 20242025: 6 June 2025 to 18 August 20252026: 18 May 2026 to 21 August 202619951999200320072011201520192023JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at NWS Boston/Norton meeting 30 C (86 F).
First to last qualifying date each year at NWS Boston/Norton
YearFirst dateLast date
19951995-05-311995-09-01
19961996-05-201996-09-06
19971997-06-101997-08-17
19981998-03-311998-09-06
19991999-05-291999-09-05
20002000-05-072000-09-01
20012001-05-012001-09-13
20022002-04-162002-10-02
20032003-04-162003-08-30
20042004-05-072004-09-04
20052005-04-202005-09-14
20062006-06-012006-08-23
20072007-05-242007-10-06
20082008-06-032008-09-05
20092009-04-262009-08-26
20102010-04-072010-09-25
20112011-05-272011-10-09
20122012-04-172012-09-01
20132013-05-222013-09-13
20142014-06-092014-09-29
20152015-05-112015-09-19
20162016-05-262016-09-23
20172017-04-172017-09-28
20182018-05-032018-09-07
20192019-05-272019-08-23
20202020-06-052020-08-26
20212021-05-242021-08-28
20222022-05-232022-08-31
20232023-04-142023-09-10
20242024-05-232024-08-29
20252025-06-062025-08-18
20262026-05-182026-08-21

Every Fixed Threshold

Fixed thresholds at NWS Boston/Norton
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days3257201023
35 C (95 F): Days241120022
90 F (32.2 C): Days323420109
100 F (37.8 C): Days7320021
0 C (32 F): Ice days (max3237200324
0 C (32 F): Frost days (min32143201993
-10 C (14 F): Days with min3250201535
-20 C (-4 F): Days with min11720152
20 C (68 F): Tropical nights (min3226201313
25 C (77 F): Days with min2120021
10 mm (0.39 in): Days with 10 mm or more rain3252201825
25 mm (0.98 in): Days with 25 mm or more rain3220199813
50 mm (1.97 in): Days with 50 mm or more rain29820054
100 mm (3.94 in): Days with 100 mm or more rain11219961
10 cm (3.9 in): Days with 10 cm or more snowfall30819964
25 cm (9.8 in): Days with 25 cm or more snowfall17420032
50 cm (19.7 in): Days with 50 cm or more snowfall2120131

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1995.

Download the Data

  • Data for NWS Boston/Norton 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).