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NWS Boston/Norton Weather Records (USC00198368)

Record envelope, standing records and threshold days for NWS Boston/Norton (USC00198368), Massachusetts, United States, with 33 years of record.

Key Facts for NWS Boston/Norton

  • NWS Boston/Norton (USC00198368) is a weather station in Massachusetts, United States at 41.96 latitude and -71.14 longitude, 26 m (85 ft) above sea level.
  • The station reports from 1994 to 2026, 33 years of record.
  • 1,464 records set at NWS Boston/Norton still stand.
  • Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
  • NWS Boston/Norton set a daily record precipitation of 59.2 mm (2.3 in) on 28 September 2026 (provisional).

Provisional Records

Records set in the last 60 days are provisional until they clear the revision window.

About the Station

  • Location: Massachusetts, United States, 41.96 latitude, -71.14 longitude.
  • Elevation: 26 m (85 ft).
  • Period of record: 1994 to 2026, 33 years.
  • Eligible elements: tmax, tmin, prcp, snow.

Daily Record Envelope and 2026

12 days at or beyond a record
Daily record high and record low at NWS Boston/Norton, with 2026 drawn through them The band shows the record high and record low for each calendar day at NWS Boston/Norton. The lines show the 2026 daily maximum and minimum. 12 days in 2026 matched or passed a record. Temperatures are in degrees Celsius. -40-2002040 JanFebMarAprMayJunJulAugSepOctNovDec
The band shows the record high and record low for each calendar day at NWS Boston/Norton. The lines show the 2026 daily maximum and minimum. 12 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at NWS Boston/Norton, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan21.1 C (70.0 F)-22.8 C (-9.0 F)10.6 C (51.1 F)-21.7 C (-7.1 F)
Feb21.7 C (71.1 F)-25.0 C (-13.0 F)7.2 C (45.0 F)-21.7 C (-7.1 F)
Mar30.0 C (86.0 F)-17.8 C (0.0 F)21.1 C (70.0 F)-15.6 C (3.9 F)
Apr35.6 C (96.1 F)-8.3 C (17.1 F)29.4 C (84.9 F)-3.9 C (25.0 F)
May36.1 C (97.0 F)-2.2 C (28.0 F)32.8 C (91.0 F)2.8 C (37.0 F)
Jun38.3 C (100.9 F)3.9 C (39.0 F)32.2 C (90.0 F)4.4 C (39.9 F)
Jul39.4 C (102.9 F)8.9 C (48.0 F)36.1 C (97.0 F)11.1 C (52.0 F)
Aug38.3 C (100.9 F)6.1 C (43.0 F)32.8 C (91.0 F)12.2 C (54.0 F)
Sep35.6 C (96.1 F)-0.6 C (30.9 F)28.9 C (84.0 F)8.3 C (46.9 F)
Oct30.6 C (87.1 F)-5.0 C (23.0 F)27.2 C (81.0 F)1.1 C (34.0 F)
Nov26.1 C (79.0 F)-11.7 C (10.9 F)n/an/a
Dec24.4 C (75.9 F)-17.2 C (1.0 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at NWS Boston/Norton by the year they were set 1,464 records at NWS Boston/Norton still stand. 1995 holds the most, with 69. 0204060801994: 251995: 691996: 581997: 321998: 331999: 472000: 652001: 582002: 682003: 482004: 392005: 492006: 392007: 562008: 462009: 412010: 482011: 422012: 432013: 482014: 552015: 692016: 432017: 532018: 532019: 322020: 442021: 262022: 372023: 242024: 272025: 292026: 18199419982002200620102014201820222026
1,464 records at NWS Boston/Norton still stand. 1995 holds the most, with 69.
Standing records at NWS Boston/Norton by the year they were set
Year setStanding records
199425
199569
199658
199732
199833
199947
200065
200158
200268
200348
200439
200549
200639
200756
200846
200941
201048
201142
201243
201348
201455
201569
201643
201753
201853
201932
202044
202126
202237
202324
202427
202529
202618

All-Time Record Progression

1 new records
When NWS Boston/Norton set new all-time records 1 all-time records were set at NWS Boston/Norton between 24 February 2026 and 24 February 2026. Each dot is a new record. Record daily snowfall24 February 2026: Record daily snowfall 54.9 cm (21.6 in)
1 all-time records were set at NWS Boston/Norton between 24 February 2026 and 24 February 2026. Each dot is a new record.
When NWS Boston/Norton set new all-time records
DateKindDetail
2026-02-24Record daily snowfallRecord daily snowfall 54.9 cm (21.6 in)

Wettest Day of Each Month

Jun: 130.0 mm (5.1 in)
Record daily precipitation for each month at NWS Boston/Norton The wettest day on record for each calendar month at NWS Boston/Norton. The most was 130.0 mm (5.1 in) on 13 June 1998. 050100150 Jan: 87.6 mm (3.4 in), 13 January 2018 Jan Feb: 67.6 mm (2.7 in), 13 February 2008 Feb Mar: 100.1 mm (3.9 in), 30 March 2010 Mar Apr: 72.4 mm (2.9 in), 23 April 2012 Apr May: 90.9 mm (3.6 in), 23 May 2025 May Jun: 130.0 mm (5.1 in), 13 June 1998 Jun Jul: 104.1 mm (4.1 in), 13 July 1996 Jul Aug: 100.6 mm (4.0 in), 11 August 2012 Aug Sep: 106.7 mm (4.2 in), 2 September 2021 Sep Oct: 129.5 mm (5.1 in), 20 October 1996 Oct Nov: 58.7 mm (2.3 in), 22 November 2005 Nov Dec: 83.1 mm (3.3 in), 12 December 2024 Dec
The wettest day on record for each calendar month at NWS Boston/Norton. The most was 130.0 mm (5.1 in) on 13 June 1998.
Record daily precipitation for each month at NWS Boston/Norton
MonthRecord daily precipitation (mm)Date
Jan87.6 mm (3.4 in)13 January 2018
Feb67.6 mm (2.7 in)13 February 2008
Mar100.1 mm (3.9 in)30 March 2010
Apr72.4 mm (2.9 in)23 April 2012
May90.9 mm (3.6 in)23 May 2025
Jun130.0 mm (5.1 in)13 June 1998
Jul104.1 mm (4.1 in)13 July 1996
Aug100.6 mm (4.0 in)11 August 2012
Sep106.7 mm (4.2 in)2 September 2021
Oct129.5 mm (5.1 in)20 October 1996
Nov58.7 mm (2.3 in)22 November 2005
Dec83.1 mm (3.3 in)12 December 2024

Period of Record Coverage

1994 to 2026
Days with data per year at NWS Boston/Norton 33 years of record at NWS Boston/Norton, 1994 to 2026. 2 years have data for under 90 percent of days and are left out of rankings: 1994, 2026. 1994: 181 of 365 days1995: 350 of 365 days1996: 366 of 366 days1997: 359 of 365 days1998: 359 of 365 days1999: 365 of 365 days2000: 366 of 366 days2001: 365 of 365 days2002: 365 of 365 days2003: 365 of 365 days2004: 366 of 366 days2005: 365 of 365 days2006: 365 of 365 days2007: 365 of 365 days2008: 366 of 366 days2009: 365 of 365 days2010: 365 of 365 days2011: 365 of 365 days2012: 365 of 366 days2013: 365 of 365 days2014: 365 of 365 days2015: 365 of 365 days2016: 366 of 366 days2017: 365 of 365 days2018: 342 of 365 days2019: 365 of 365 days2020: 364 of 366 days2021: 365 of 365 days2022: 365 of 365 days2023: 364 of 365 days2024: 366 of 366 days2025: 365 of 365 days2026: 284 of 365 days1995200020052010201520202025
33 years of record at NWS Boston/Norton, 1994 to 2026. 2 years have data for under 90 percent of days and are left out of rankings: 1994, 2026.
Days with data per year at NWS Boston/Norton
YearDays with dataShare of yearComplete
199418150%No
199535096%Yes
1996366100%Yes
199735998%Yes
199835998%Yes
1999365100%Yes
2000366100%Yes
2001365100%Yes
2002365100%Yes
2003365100%Yes
2004366100%Yes
2005365100%Yes
2006365100%Yes
2007365100%Yes
2008366100%Yes
2009365100%Yes
2010365100%Yes
2011365100%Yes
2012365100%Yes
2013365100%Yes
2014365100%Yes
2015365100%Yes
2016366100%Yes
2017365100%Yes
201834294%Yes
2019365100%Yes
202036499%Yes
2021365100%Yes
2022365100%Yes
2023364100%Yes
2024366100%Yes
2025365100%Yes
202628478%No

Latest Records

20
Latest records at NWS Boston/Norton
DateStationRecordValueBeat old record byOld record stoodSignificance
28 September 2026NWS Boston/Norton, USdaily rain (Provisional)59.2 mm (2.3 in)38.1 mm (1.5 in)21 years29 of 100 (Routine)
28 September 2026NWS Boston/Norton, USdaily low max (Provisional)17.2 C (63.0 F)0.6 C (1.1 F)25 years11 of 100 (Routine)
27 September 2026NWS Boston/Norton, USmonthly rain (Provisional)114.3 mm (4.5 in)7.6 mm (0.30 in)5 years18 of 100 (Routine)
27 September 2026NWS Boston/Norton, USdaily low max (Tie, Provisional)15.6 C (60.1 F)tie29 years2 of 100 (Routine)
14 September 2026NWS Boston/Norton, USdaily rain (Provisional)50.8 mm (2.0 in)36.1 mm (1.4 in)17 years27 of 100 (Routine)
11 September 2026NWS Boston/Norton, USdaily high max (Tie, Provisional)28.9 C (84.0 F)tie9 years1 of 100 (Routine)
7 August 2026NWS Boston/Norton, USdaily high min23.3 C (73.9 F)1.1 C (2.0 F)24 years13 of 100 (Routine)
4 August 2026NWS Boston/Norton, USdaily rain51.8 mm (2.0 in)41.1 mm (1.6 in)11 years34 of 100 (Routine)
22 July 2026NWS Boston/Norton, USdaily rain38.4 mm (1.5 in)26.5 mm (1.0 in)23 years31 of 100 (Routine)
22 July 2026NWS Boston/Norton, USdaily low max (Tie)25.6 C (78.1 F)tie8 years1 of 100 (Routine)
20 July 2026NWS Boston/Norton, USdaily low min (Tie)11.1 C (52.0 F)tie28 years2 of 100 (Routine)
4 July 2026NWS Boston/Norton, USdaily high min24.4 C (75.9 F)1.1 C (2.0 F)24 years13 of 100 (Routine)
2 July 2026NWS Boston/Norton, USdaily high min22.8 C (73.0 F)0.6 C (1.1 F)27 years12 of 100 (Routine)
12 June 2026NWS Boston/Norton, USdaily high min (Tie)19.4 C (66.9 F)tie29 years2 of 100 (Routine)
12 June 2026NWS Boston/Norton, USdaily high max (Tie)32.2 C (90.0 F)tie8 years1 of 100 (Routine)
2 June 2026NWS Boston/Norton, USdaily low min4.4 C (39.9 F)0.6 C (1.1 F)5 years5 of 100 (Routine)
31 May 2026NWS Boston/Norton, USdaily low min3.3 C (37.9 F)1.7 C (3.1 F)29 years15 of 100 (Routine)
21 May 2026NWS Boston/Norton, USdaily high min17.8 C (64.0 F)1.1 C (2.0 F)29 years13 of 100 (Routine)
20 May 2026NWS Boston/Norton, USdaily high min16.7 C (62.1 F)3.4 C (6.1 F)29 years19 of 100 (Routine)
18 May 2026NWS Boston/Norton, USdaily high max (Tie)30.6 C (87.1 F)tie8 years1 of 100 (Routine)

Climate Trend

30 complete years, 1995 to 2025
Annual mean temperature at NWS Boston/Norton as warming stripes, 1995 to 2025 One stripe for each of 30 complete years at NWS Boston/Norton, 1995 to 2025. Blue stripes are years cooler than the station's own mean of 10.5 C (51.0 F); red stripes are warmer. The coolest year was 1996, at 9.6 C (49.3 F), and the warmest was 2012, at 11.8 C (53.2 F). The strongest colour marks a difference of 1.3 C (2.3 F). 1995: 9.7 C, -0.8 C from the station mean1996: 9.6 C, -0.9 C from the station mean1997: 9.7 C, -0.9 C from the station mean1998: 11.2 C, +0.6 C from the station mean1999: 11.2 C, +0.6 C from the station mean2000: 9.9 C, -0.6 C from the station mean2001: 11.0 C, +0.5 C from the station mean2002: 11.0 C, +0.4 C from the station mean2003: 9.8 C, -0.8 C from the station mean2004: 9.9 C, -0.7 C from the station mean2005: 10.3 C, -0.2 C from the station mean2006: 11.3 C, +0.8 C from the station mean2007: 10.4 C, -0.1 C from the station mean2008: 10.7 C, +0.1 C from the station mean2009: 10.0 C, -0.5 C from the station mean2010: 11.5 C, +0.9 C from the station mean2011: 11.1 C, +0.6 C from the station mean2012: 11.8 C, +1.2 C from the station mean2013: 10.4 C, -0.1 C from the station mean2014: 10.0 C, -0.6 C from the station mean2015: 10.2 C, -0.3 C from the station mean2016: 11.3 C, +0.7 C from the station mean2017: 10.8 C, +0.3 C from the station mean2019: 9.7 C, -0.9 C from the station mean2020: 10.9 C, +0.4 C from the station mean2021: 10.8 C, +0.2 C from the station mean2022: 10.6 C, +0.1 C from the station mean2023: 11.1 C, +0.5 C from the station mean2024: 10.8 C, +0.2 C from the station mean2025: 9.9 C, -0.6 C from the station mean1995200020052010201520202025
One stripe for each of 30 complete years at NWS Boston/Norton, 1995 to 2025. Blue stripes are years cooler than the station's own mean of 10.5 C (51.0 F); red stripes are warmer. The coolest year was 1996, at 9.6 C (49.3 F), and the warmest was 2012, at 11.8 C (53.2 F). The strongest colour marks a difference of 1.3 C (2.3 F).
Annual mean temperature at NWS Boston/Norton as warming stripes, 1995 to 2025
YearAnnual mean temperatureDifference from the station mean
19959.7 C-0.84 C
19969.6 C-0.95 C
19979.7 C-0.86 C
199811.2 C+0.63 C
199911.2 C+0.62 C
20009.9 C-0.63 C
200111.0 C+0.49 C
200211.0 C+0.41 C
20039.8 C-0.79 C
20049.9 C-0.67 C
200510.3 C-0.23 C
200611.3 C+0.79 C
200710.4 C-0.15 C
200810.7 C+0.13 C
200910.0 C-0.52 C
201011.5 C+0.90 C
201111.1 C+0.58 C
201211.8 C+1.20 C
201310.4 C-0.12 C
201410.0 C-0.57 C
201510.2 C-0.31 C
201611.3 C+0.71 C
201710.8 C+0.26 C
20199.7 C-0.89 C
202010.9 C+0.36 C
202110.8 C+0.20 C
202210.6 C+0.05 C
202311.1 C+0.54 C
202410.8 C+0.22 C
20259.9 C-0.64 C

The fitted trend in annual mean temperature here over 1995 to 2025 is 0.1 C (-0.1 to 0.4) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.2 F (-0.2 to 0.7) per decade. The slope is a straight line fitted to 30 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at NWS Boston/Norton
MeasurePer decade (C)Per decade (F)PeriodComplete yearsReading
Annual mean temperature0.1 C (-0.1 to 0.4) per decade0.2 F (-0.2 to 0.7) per decade1995 to 202530Not clearly different from zero
Mean daily maximum0.1 C (-0.2 to 0.4) per decade0.2 F (-0.4 to 0.7) per decade1995 to 202530Not clearly different from zero
Mean daily minimum0.2 C (-0.1 to 0.4) per decade0.3 F (-0.1 to 0.8) per decade1995 to 202530Not clearly different from zero

A year is complete when all 12 months have at least 20 days of both daily maximum and daily minimum readings. The annual mean is the mean of the monthly means. The trend describes this one station over this period; it does not say what caused the change.

Extremes by Year

1994 to 2026
Yearly extremes at NWS Boston/Norton: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)39.4 C (102.9 F)201135.6 C (96.1 F)33
Coldest night (TNn)-25.0 C (-13.0 F)1996-17.8 C (0.0 F)33
Wettest day (Rx1day)130.0 mm (5.1 in)199883.1 mm (3.3 in)33
Wettest five days (Rx5day)241.3 mm (9.5 in)1998114.1 mm (4.5 in)33
Longest dry spell (CDD)26 days200115 days33

Hottest day (TXx)

Hottest day (TXx) at NWS Boston/Norton by year The hottest day of the year at NWS Boston/Norton, 1994 to 2026. The record is 39.4 C (102.9 F) in 2011, marked on the chart; the median year is 35.6 C (96.1 F). 3234363840200020102020Record: 39.4 C (102.9 F) in 2011
The hottest day of the year at NWS Boston/Norton, 1994 to 2026. The record is 39.4 C (102.9 F) in 2011, marked on the chart; the median year is 35.6 C (96.1 F).
Hottest day (TXx) at NWS Boston/Norton by year
YearHottest day (TXx)
199433.9 C (93.0 F)
199535.6 C (96.1 F)
199634.4 C (93.9 F)
199735.0 C (95.0 F)
199832.8 C (91.0 F)
199936.7 C (98.1 F)
200033.3 C (91.9 F)
200138.3 C (100.9 F)
200237.8 C (100.0 F)
200335.6 C (96.1 F)
200434.4 C (93.9 F)
200537.2 C (99.0 F)
200638.3 C (100.9 F)
200735.6 C (96.1 F)
200838.3 C (100.9 F)
200935.6 C (96.1 F)
201038.9 C (102.0 F)
201139.4 C (102.9 F)
201237.2 C (99.0 F)
201337.8 C (100.0 F)
201433.9 C (93.0 F)
201535.6 C (96.1 F)
201636.1 C (97.0 F)
201736.7 C (98.1 F)
201835.0 C (95.0 F)
201933.9 C (93.0 F)
202036.1 C (97.0 F)
202135.0 C (95.0 F)
202236.7 C (98.1 F)
202332.8 C (91.0 F)
202433.3 C (91.9 F)
202536.7 C (98.1 F)
202636.1 C (97.0 F)

Coldest night (TNn)

Coldest night (TNn) at NWS Boston/Norton by year The coldest night of the year at NWS Boston/Norton, 1994 to 2026. The record is -25.0 C (-13.0 F) in 1996, marked on the chart; the median year is -17.8 C (0.0 F). -25-20-15-10200020102020Record: -25.0 C (-13.0 F) in 1996
The coldest night of the year at NWS Boston/Norton, 1994 to 2026. The record is -25.0 C (-13.0 F) in 1996, marked on the chart; the median year is -17.8 C (0.0 F).
Coldest night (TNn) at NWS Boston/Norton by year
YearColdest night (TNn)
1994-11.1 C (12.0 F)
1995-18.9 C (-2.0 F)
1996-25.0 C (-13.0 F)
1997-18.3 C (-0.9 F)
1998-14.4 C (6.1 F)
1999-15.6 C (3.9 F)
2000-18.3 C (-0.9 F)
2001-16.1 C (3.0 F)
2002-15.0 C (5.0 F)
2003-18.9 C (-2.0 F)
2004-22.2 C (-8.0 F)
2005-22.8 C (-9.0 F)
2006-13.9 C (7.0 F)
2007-16.7 C (1.9 F)
2008-16.1 C (3.0 F)
2009-19.4 C (-2.9 F)
2010-16.7 C (1.9 F)
2011-20.6 C (-5.1 F)
2012-14.4 C (6.1 F)
2013-16.7 C (1.9 F)
2014-21.1 C (-6.0 F)
2015-22.8 C (-9.0 F)
2016-23.9 C (-11.0 F)
2017-17.2 C (1.0 F)
2018-20.6 C (-5.1 F)
2019-17.8 C (0.0 F)
2020-14.4 C (6.1 F)
2021-17.2 C (1.0 F)
2022-22.2 C (-8.0 F)
2023-23.3 C (-9.9 F)
2024-15.0 C (5.0 F)
2025-17.8 C (0.0 F)
2026-21.7 C (-7.1 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at NWS Boston/Norton by year The wettest day of the year at NWS Boston/Norton, 1994 to 2026. The record is 130.0 mm (5.1 in) in 1998, marked on the chart; the median year is 83.1 mm (3.3 in). 255075100125150200020102020Record: 130.0 mm (5.1 in) in 1998
The wettest day of the year at NWS Boston/Norton, 1994 to 2026. The record is 130.0 mm (5.1 in) in 1998, marked on the chart; the median year is 83.1 mm (3.3 in).
Wettest day (Rx1day) at NWS Boston/Norton by year
YearWettest day (Rx1day)
199469.6 mm (2.7 in)
199564.3 mm (2.5 in)
1996129.5 mm (5.1 in)
199759.2 mm (2.3 in)
1998130.0 mm (5.1 in)
199991.2 mm (3.6 in)
200056.6 mm (2.2 in)
200183.3 mm (3.3 in)
200251.8 mm (2.0 in)
200381.5 mm (3.2 in)
200463.0 mm (2.5 in)
2005120.4 mm (4.7 in)
2006126.0 mm (5.0 in)
200762.2 mm (2.4 in)
200890.2 mm (3.6 in)
200952.1 mm (2.1 in)
2010100.1 mm (3.9 in)
201157.7 mm (2.3 in)
2012100.6 mm (4.0 in)
2013103.4 mm (4.1 in)
201491.9 mm (3.6 in)
201546.2 mm (1.8 in)
201647.0 mm (1.9 in)
201781.3 mm (3.2 in)
2018104.6 mm (4.1 in)
201951.3 mm (2.0 in)
202048.5 mm (1.9 in)
2021106.7 mm (4.2 in)
202274.4 mm (2.9 in)
2023103.6 mm (4.1 in)
202483.1 mm (3.3 in)
202590.9 mm (3.6 in)
2026114.3 mm (4.5 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at NWS Boston/Norton by year The wettest five days of the year at NWS Boston/Norton, 1994 to 2026. The record is 241.3 mm (9.5 in) in 1998, marked on the chart; the median year is 114.1 mm (4.5 in). 50100150200250200020102020Record: 241.3 mm (9.5 in) in 1998
The wettest five days of the year at NWS Boston/Norton, 1994 to 2026. The record is 241.3 mm (9.5 in) in 1998, marked on the chart; the median year is 114.1 mm (4.5 in).
Wettest five days (Rx5day) at NWS Boston/Norton by year
YearWettest five days (Rx5day)
1994123.9 mm (4.9 in)
199583.1 mm (3.3 in)
1996162.0 mm (6.4 in)
1997104.9 mm (4.1 in)
1998241.3 mm (9.5 in)
1999114.4 mm (4.5 in)
200089.9 mm (3.5 in)
2001144.0 mm (5.7 in)
200283.4 mm (3.3 in)
2003128.3 mm (5.1 in)
200495.6 mm (3.8 in)
2005204.5 mm (8.1 in)
2006182.8 mm (7.2 in)
2007103.4 mm (4.1 in)
2008129.1 mm (5.1 in)
200979.0 mm (3.1 in)
2010184.9 mm (7.3 in)
2011101.2 mm (4.0 in)
2012110.3 mm (4.3 in)
2013172.5 mm (6.8 in)
2014117.0 mm (4.6 in)
201569.4 mm (2.7 in)
201666.6 mm (2.6 in)
2017123.3 mm (4.9 in)
2018124.4 mm (4.9 in)
201988.3 mm (3.5 in)
202086.8 mm (3.4 in)
2021109.5 mm (4.3 in)
2022113.3 mm (4.5 in)
2023116.2 mm (4.6 in)
2024114.1 mm (4.5 in)
202599.2 mm (3.9 in)
2026184.7 mm (7.3 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at NWS Boston/Norton by year The longest dry spell of the year at NWS Boston/Norton, 1994 to 2026. The record is 26 days in 2001, marked on the chart; the median year is 15 days. 1015202530200020102020Record: 26 days in 2001
The longest dry spell of the year at NWS Boston/Norton, 1994 to 2026. The record is 26 days in 2001, marked on the chart; the median year is 15 days.
Longest dry spell (CDD) at NWS Boston/Norton by year
YearLongest dry spell (CDD)
199418 days
199512 days
199614 days
199719 days
199817 days
199920 days
200011 days
200126 days
200217 days
200313 days
200413 days
200522 days
200620 days
200723 days
200822 days
200913 days
201013 days
201115 days
201214 days
201323 days
201412 days
201515 days
201615 days
201712 days
201814 days
201914 days
202024 days
202117 days
202210 days
202320 days
202415 days
202516 days
202611 days

Each chart shows one value per year; the dot marks the record year. TXx is the hottest daily maximum, TNn the coldest daily minimum, Rx1day and Rx5day the largest one-day and five-day rain totals, and CDD the longest run of days with less than 1 mm of rain. A year with missing days can understate an extreme.

Frost Dates and Growing Season

30 years with a frost

Across 30 years with a frost, the median last spring frost at NWS Boston/Norton falls on 27 April and the median first autumn frost on 18 October, which leaves a median of 174 days between them.

Fitted over all years, the growing season changes by +9.1 days per decade at this station.

Frost dates and growing season at NWS Boston/Norton
MeasureMedian, all yearsEarliest periodRecent period (1995 to 2025)Recent against earliestFitted trend
Last spring frost27 Apriln/a27 Apriln/a-3.2 days per decade
First autumn frost18 Octobern/a18 Octobern/a+5.9 days per decade
Growing days174 daysn/a174 daysn/a+9.1 days per decade

A frost day is a day with a daily minimum at or below 0 C (32 F). The last spring frost and the first autumn frost are the last and first such days of the cold season, and growing days are the days between them. A negative trend for the last spring frost means it comes earlier.

Rainfall Return Levels

31 years, 1995 to 2025

A day with at least 80.3 mm (3.2 in) of rain is expected about once in 2 years. A day with at least 151.7 mm (6.0 in) of rain is expected about once in 100 years.

Rainfall return levels at NWS Boston/Norton: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years80.3 mm (3.2 in)
5 years104.5 mm (4.1 in)
10 years118.2 mm (4.7 in)
25 years133.2 mm (5.2 in)
50 years143.0 mm (5.6 in)Longer than the 31 years of record
100 years151.7 mm (6.0 in)Longer than the 31 years of record

The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 31 years of values from 1995 to 2025.

A return level is an estimate. It is least reliable for the long periods, 50 and 100 years, and for any period longer than the record behind the fit, where the fit has to reach past the largest day actually observed. It is not a forecast.

The largest wettest-day totals in the fit: 130.0 mm (5.1 in) in 1998; 129.5 mm (5.1 in) in 1996; 126.0 mm (5.0 in) in 2006.

Download the Data

  • Data for NWS Boston/Norton standing records by year: CSV or JSON. Field meanings are on the data page.
  • 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 2026-10-14 (14 October 2026). Records are computed by this site and are not official.

Data as of . Last revised (2026-10-14).