Built 2026-10-18 (18 October 2026)

Groveland Weather Records (USC00193276)

Record envelope, standing records and threshold days for Groveland (USC00193276), Massachusetts, United States, with 35 years of record.

Key Facts for Groveland

  • Groveland (USC00193276) is a weather station in Massachusetts, United States at 42.75 latitude and -71.04 longitude, 9 m (30 ft) above sea level.
  • The station reports from 1992 to 2026, 35 years of record.
  • 1,464 records set at Groveland still stand.
  • Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
  • Groveland set a daily record low maximum temperature of 14.4 C (57.9 F) on 27 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, 42.75 latitude, -71.04 longitude.
  • Elevation: 9 m (30 ft).
  • Period of record: 1992 to 2026, 35 years.
  • Eligible elements: tmax, tmin, prcp, snow, snwd.

Daily Record Envelope and 2026

6 days at or beyond a record
Daily record high and record low at Groveland, with 2026 drawn through them The band shows the record high and record low for each calendar day at Groveland. The lines show the 2026 daily maximum and minimum. 6 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 Groveland. The lines show the 2026 daily maximum and minimum. 6 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Groveland, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan22.2 C (72.0 F)-30.0 C (-22.0 F)10.0 C (50.0 F)-21.7 C (-7.1 F)
Feb23.3 C (73.9 F)-26.7 C (-16.1 F)10.6 C (51.1 F)-17.2 C (1.0 F)
Mar31.7 C (89.1 F)-22.2 C (-8.0 F)23.3 C (73.9 F)-14.4 C (6.1 F)
Apr33.9 C (93.0 F)-12.2 C (10.0 F)27.8 C (82.0 F)-3.3 C (26.1 F)
May35.6 C (96.1 F)-3.3 C (26.1 F)35.6 C (96.1 F)0.6 C (33.1 F)
Jun37.8 C (100.0 F)2.2 C (36.0 F)32.2 C (90.0 F)5.6 C (42.1 F)
Jul37.8 C (100.0 F)7.2 C (45.0 F)35.6 C (96.1 F)10.0 C (50.0 F)
Aug37.2 C (99.0 F)5.0 C (41.0 F)32.8 C (91.0 F)11.1 C (52.0 F)
Sep34.4 C (93.9 F)-1.7 C (28.9 F)26.1 C (79.0 F)5.0 C (41.0 F)
Oct29.4 C (84.9 F)-10.0 C (14.0 F)23.9 C (75.0 F)5.6 C (42.1 F)
Nov26.7 C (80.1 F)-14.4 C (6.1 F)n/an/a
Dec24.4 C (75.9 F)-22.2 C (-8.0 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Groveland by the year they were set 1,464 records at Groveland still stand. 2002 holds the most, with 80. 0204060801992: 311993: 611994: 511995: 581996: 521997: 391998: 311999: 452000: 522001: 512002: 802003: 542004: 352005: 412006: 342007: 662008: 272009: 362010: 362011: 352012: 382013: 412014: 382015: 542016: 402017: 592018: 392019: 282020: 382021: 392022: 422023: 272024: 252025: 272026: 14199219962000200420082012201620202024
1,464 records at Groveland still stand. 2002 holds the most, with 80.
Standing records at Groveland by the year they were set
Year setStanding records
199231
199361
199451
199558
199652
199739
199831
199945
200052
200151
200280
200354
200435
200541
200634
200766
200827
200936
201036
201135
201238
201341
201438
201554
201640
201759
201839
201928
202038
202139
202242
202327
202425
202527
202614

Wettest Day of Each Month

Oct: 179.6 mm (7.1 in)
Record daily precipitation for each month at Groveland The wettest day on record for each calendar month at Groveland. The most was 179.6 mm (7.1 in) on 20 October 1996. 050100150200 Jan: 55.6 mm (2.2 in), 10 January 2024 Jan Feb: 67.8 mm (2.7 in), 13 February 2008 Feb Mar: 172.5 mm (6.8 in), 14 March 2010 Mar Apr: 110.2 mm (4.3 in), 1 April 2004 Apr May: 115.3 mm (4.5 in), 14 May 2006 May Jun: 100.1 mm (3.9 in), 13 June 1998 Jun Jul: 128.3 mm (5.1 in), 13 July 1996 Jul Aug: 124.5 mm (4.9 in), 8 August 2023 Aug Sep: 139.2 mm (5.5 in), 23 September 1994 Sep Oct: 179.6 mm (7.1 in), 20 October 1996 Oct Nov: 64.8 mm (2.6 in), 14 November 2009 Nov Dec: 98.8 mm (3.9 in), 9 December 2014 Dec
The wettest day on record for each calendar month at Groveland. The most was 179.6 mm (7.1 in) on 20 October 1996.
Record daily precipitation for each month at Groveland
MonthRecord daily precipitation (mm)Date
Jan55.6 mm (2.2 in)10 January 2024
Feb67.8 mm (2.7 in)13 February 2008
Mar172.5 mm (6.8 in)14 March 2010
Apr110.2 mm (4.3 in)1 April 2004
May115.3 mm (4.5 in)14 May 2006
Jun100.1 mm (3.9 in)13 June 1998
Jul128.3 mm (5.1 in)13 July 1996
Aug124.5 mm (4.9 in)8 August 2023
Sep139.2 mm (5.5 in)23 September 1994
Oct179.6 mm (7.1 in)20 October 1996
Nov64.8 mm (2.6 in)14 November 2009
Dec98.8 mm (3.9 in)9 December 2014

Period of Record Coverage

1992 to 2026
Days with data per year at Groveland 35 years of record at Groveland, 1992 to 2026. 2 years have data for under 90 percent of days and are left out of rankings: 1992, 2026. 1992: 153 of 366 days1993: 364 of 365 days1994: 365 of 365 days1995: 365 of 365 days1996: 366 of 366 days1997: 365 of 365 days1998: 364 of 365 days1999: 365 of 365 days2000: 365 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: 364 of 365 days2010: 365 of 365 days2011: 365 of 365 days2012: 366 of 366 days2013: 365 of 365 days2014: 365 of 365 days2015: 365 of 365 days2016: 366 of 366 days2017: 365 of 365 days2018: 365 of 365 days2019: 365 of 365 days2020: 366 of 366 days2021: 365 of 365 days2022: 365 of 365 days2023: 365 of 365 days2024: 366 of 366 days2025: 365 of 365 days2026: 262 of 365 days1995200020052010201520202025
35 years of record at Groveland, 1992 to 2026. 2 years have data for under 90 percent of days and are left out of rankings: 1992, 2026.
Days with data per year at Groveland
YearDays with dataShare of yearComplete
199215342%No
1993364100%Yes
1994365100%Yes
1995365100%Yes
1996366100%Yes
1997365100%Yes
1998364100%Yes
1999365100%Yes
2000365100%Yes
2001365100%Yes
2002365100%Yes
2003365100%Yes
2004366100%Yes
2005365100%Yes
2006365100%Yes
2007365100%Yes
2008366100%Yes
2009364100%Yes
2010365100%Yes
2011365100%Yes
2012366100%Yes
2013365100%Yes
2014365100%Yes
2015365100%Yes
2016366100%Yes
2017365100%Yes
2018365100%Yes
2019365100%Yes
2020366100%Yes
2021365100%Yes
2022365100%Yes
2023365100%Yes
2024366100%Yes
2025365100%Yes
202626272%No

Latest Records

20
Latest records at Groveland
DateStationRecordValueBeat old record byOld record stoodSignificance
27 September 2026Groveland, USdaily low max (Provisional)14.4 C (57.9 F)1.2 C (2.2 F)29 years13 of 100 (Routine)
17 September 2026Groveland, USdaily high min (Provisional)17.2 C (63.0 F)1.1 C (2.0 F)33 years15 of 100 (Routine)
18 August 2026Groveland, USdaily high min (Tie, Provisional)20.0 C (68.0 F)tie27 years2 of 100 (Routine)
30 July 2026Groveland, USdaily rain29.5 mm (1.2 in)5.6 mm (0.22 in)4 years8 of 100 (Routine)
30 July 2026Groveland, USdaily low max (Tie)23.3 C (73.9 F)tie25 years2 of 100 (Routine)
29 July 2026Groveland, USdaily low max (Tie)21.7 C (71.1 F)tie1 year0 of 100 (Routine)
15 July 2026Groveland, USdaily high min (Tie)23.9 C (75.0 F)tie31 years3 of 100 (Routine)
4 July 2026Groveland, USdaily high min23.3 C (73.9 F)0.5 C (0.9 F)24 years11 of 100 (Routine)
3 July 2026Groveland, USdaily high min24.4 C (75.9 F)1.1 C (2.0 F)24 years13 of 100 (Routine)
2 July 2026Groveland, USdaily high min23.9 C (75.0 F)2.2 C (4.0 F)12 years12 of 100 (Routine)
2 July 2026Groveland, USdaily high max35.6 C (96.1 F)1.2 C (2.2 F)12 years9 of 100 (Routine)
15 June 2026Groveland, USdaily high min20.0 C (68.0 F)0.6 C (1.1 F)27 years12 of 100 (Routine)
12 June 2026Groveland, USdaily high min20.6 C (69.1 F)1.2 C (2.2 F)29 years13 of 100 (Routine)
11 June 2026Groveland, USdaily high min (Tie)21.7 C (71.1 F)tie20 years2 of 100 (Routine)
4 June 2026Groveland, USdaily high max31.7 C (89.1 F)1.1 C (2.0 F)5 years6 of 100 (Routine)
20 May 2026Groveland, USdaily high min20.0 C (68.0 F)2.8 C (5.0 F)7 years11 of 100 (Routine)
19 May 2026Groveland, USmonthly high max35.6 C (96.1 F)0.6 C (1.1 F)15 years18 of 100 (Routine)
6 May 2026Groveland, USdaily high min15.6 C (60.1 F)0.6 C (1.1 F)32 years13 of 100 (Routine)
11 April 2026Groveland, USdaily high min (Tie)7.8 C (46.0 F)tie32 years3 of 100 (Routine)
28 March 2026Groveland, USdaily low max2.2 C (36.0 F)0.6 C (1.1 F)11 years7 of 100 (Routine)

Climate Trend

33 complete years, 1993 to 2025
Annual mean temperature at Groveland as warming stripes, 1993 to 2025 One stripe for each of 33 complete years at Groveland, 1993 to 2025. Blue stripes are years cooler than the station's own mean of 9.5 C (49.2 F); red stripes are warmer. The coolest year was 2014, at 8.5 C (47.2 F), and the warmest was 2023, at 10.7 C (51.3 F). The strongest colour marks a difference of 1.2 C (2.2 F). 1993: 8.6 C, -1.0 C from the station mean1994: 9.0 C, -0.6 C from the station mean1995: 9.0 C, -0.6 C from the station mean1996: 8.7 C, -0.8 C from the station mean1997: 8.8 C, -0.7 C from the station mean1998: 10.5 C, +0.9 C from the station mean1999: 10.2 C, +0.7 C from the station mean2000: 9.1 C, -0.5 C from the station mean2001: 9.8 C, +0.3 C from the station mean2002: 10.0 C, +0.4 C from the station mean2003: 8.7 C, -0.8 C from the station mean2004: 9.1 C, -0.4 C from the station mean2005: 9.2 C, -0.3 C from the station mean2006: 10.3 C, +0.7 C from the station mean2007: 9.1 C, -0.5 C from the station mean2008: 9.2 C, -0.4 C from the station mean2009: 8.8 C, -0.8 C from the station mean2010: 10.3 C, +0.7 C from the station mean2011: 9.5 C, 0.0 C from the station mean2012: 10.3 C, +0.8 C from the station mean2013: 9.0 C, -0.5 C from the station mean2014: 8.5 C, -1.1 C from the station mean2015: 8.9 C, -0.7 C from the station mean2016: 9.8 C, +0.3 C from the station mean2017: 9.4 C, -0.2 C from the station mean2018: 9.6 C, 0.0 C from the station mean2019: 9.4 C, -0.2 C from the station mean2020: 10.6 C, +1.1 C from the station mean2021: 10.6 C, +1.0 C from the station mean2022: 10.5 C, +0.9 C from the station mean2023: 10.7 C, +1.2 C from the station mean2024: 10.6 C, +1.1 C from the station mean2025: 9.7 C, +0.2 C from the station mean1993200020052010201520202025
One stripe for each of 33 complete years at Groveland, 1993 to 2025. Blue stripes are years cooler than the station's own mean of 9.5 C (49.2 F); red stripes are warmer. The coolest year was 2014, at 8.5 C (47.2 F), and the warmest was 2023, at 10.7 C (51.3 F). The strongest colour marks a difference of 1.2 C (2.2 F).
Annual mean temperature at Groveland as warming stripes, 1993 to 2025
YearAnnual mean temperatureDifference from the station mean
19938.6 C-1.00 C
19949.0 C-0.60 C
19959.0 C-0.56 C
19968.7 C-0.81 C
19978.8 C-0.73 C
199810.5 C+0.93 C
199910.2 C+0.66 C
20009.1 C-0.48 C
20019.8 C+0.25 C
200210.0 C+0.40 C
20038.7 C-0.85 C
20049.1 C-0.45 C
20059.2 C-0.34 C
200610.3 C+0.74 C
20079.1 C-0.49 C
20089.2 C-0.38 C
20098.8 C-0.78 C
201010.3 C+0.71 C
20119.5 C-0.03 C
201210.3 C+0.78 C
20139.0 C-0.53 C
20148.5 C-1.08 C
20158.9 C-0.69 C
20169.8 C+0.29 C
20179.4 C-0.18 C
20189.6 C+0.02 C
20199.4 C-0.16 C
202010.6 C+1.05 C
202110.6 C+1.01 C
202210.5 C+0.90 C
202310.7 C+1.15 C
202410.6 C+1.05 C
20259.7 C+0.17 C

The annual mean temperature here has risen by 0.3 C (0.1 to 0.6) per decade over 1993 to 2025. In Fahrenheit: 0.6 F (0.2 to 1.0) per decade. The slope is a straight line fitted to 33 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Groveland
MeasurePer decade (C)Per decade (F)PeriodComplete yearsReading
Annual mean temperature0.3 C (0.1 to 0.6) per decade0.6 F (0.2 to 1.0) per decade1993 to 202533Rise
Mean daily maximum0.27 C (0.04 to 0.51) per decade0.5 F (0.1 to 0.9) per decade1993 to 202533Rise
Mean daily minimum0.4 C (0.1 to 0.7) per decade0.7 F (0.2 to 1.3) per decade1993 to 202533Rise

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

1992 to 2026
Yearly extremes at Groveland: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)37.8 C (100.0 F)199335.6 C (96.1 F)35
Coldest night (TNn)-30.0 C (-22.0 F)1994-21.7 C (-7.1 F)35
Wettest day (Rx1day)179.6 mm (7.1 in)199673.2 mm (2.9 in)35
Wettest five days (Rx5day)316.5 mm (12.5 in)1996101.1 mm (4.0 in)35
Longest dry spell (CDD)33 days199916 days35

Hottest day (TXx)

Hottest day (TXx) at Groveland by year The hottest day of the year at Groveland, 1992 to 2026. The record is 37.8 C (100.0 F) in 1993, marked on the chart; the median year is 35.6 C (96.1 F). 3032343638200020102020Record: 37.8 C (100.0 F) in 1993
The hottest day of the year at Groveland, 1992 to 2026. The record is 37.8 C (100.0 F) in 1993, marked on the chart; the median year is 35.6 C (96.1 F).
Hottest day (TXx) at Groveland by year
YearHottest day (TXx)
199231.7 C (89.1 F)
199337.8 C (100.0 F)
199436.1 C (97.0 F)
199537.8 C (100.0 F)
199632.8 C (91.0 F)
199735.0 C (95.0 F)
199836.7 C (98.1 F)
199936.1 C (97.0 F)
200033.9 C (93.0 F)
200135.0 C (95.0 F)
200237.2 C (99.0 F)
200335.0 C (95.0 F)
200433.9 C (93.0 F)
200535.6 C (96.1 F)
200636.1 C (97.0 F)
200736.1 C (97.0 F)
200836.1 C (97.0 F)
200934.4 C (93.9 F)
201037.2 C (99.0 F)
201137.8 C (100.0 F)
201235.0 C (95.0 F)
201336.1 C (97.0 F)
201434.4 C (93.9 F)
201533.9 C (93.0 F)
201635.6 C (96.1 F)
201734.4 C (93.9 F)
201835.0 C (95.0 F)
201934.4 C (93.9 F)
202035.0 C (95.0 F)
202135.6 C (96.1 F)
202237.2 C (99.0 F)
202333.9 C (93.0 F)
202435.0 C (95.0 F)
202537.8 C (100.0 F)
202635.6 C (96.1 F)

Coldest night (TNn)

Coldest night (TNn) at Groveland by year The coldest night of the year at Groveland, 1992 to 2026. The record is -30.0 C (-22.0 F) in 1994, marked on the chart; the median year is -21.7 C (-7.1 F). -30-25-20-15200020102020Record: -30.0 C (-22.0 F) in 1994
The coldest night of the year at Groveland, 1992 to 2026. The record is -30.0 C (-22.0 F) in 1994, marked on the chart; the median year is -21.7 C (-7.1 F).
Coldest night (TNn) at Groveland by year
YearColdest night (TNn)
1992-16.7 C (1.9 F)
1993-25.0 C (-13.0 F)
1994-30.0 C (-22.0 F)
1995-22.2 C (-8.0 F)
1996-26.7 C (-16.1 F)
1997-21.1 C (-6.0 F)
1998-17.2 C (1.0 F)
1999-21.7 C (-7.1 F)
2000-20.6 C (-5.1 F)
2001-18.3 C (-0.9 F)
2002-15.6 C (3.9 F)
2003-23.9 C (-11.0 F)
2004-22.8 C (-9.0 F)
2005-25.6 C (-14.1 F)
2006-15.6 C (3.9 F)
2007-18.3 C (-0.9 F)
2008-20.0 C (-4.0 F)
2009-26.1 C (-15.0 F)
2010-19.4 C (-2.9 F)
2011-22.8 C (-9.0 F)
2012-17.8 C (0.0 F)
2013-22.2 C (-8.0 F)
2014-25.0 C (-13.0 F)
2015-26.7 C (-16.1 F)
2016-25.6 C (-14.1 F)
2017-22.2 C (-8.0 F)
2018-25.0 C (-13.0 F)
2019-20.0 C (-4.0 F)
2020-17.8 C (0.0 F)
2021-16.7 C (1.9 F)
2022-21.1 C (-6.0 F)
2023-25.0 C (-13.0 F)
2024-18.3 C (-0.9 F)
2025-23.3 C (-9.9 F)
2026-21.7 C (-7.1 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at Groveland by year The wettest day of the year at Groveland, 1992 to 2026. The record is 179.6 mm (7.1 in) in 1996, marked on the chart; the median year is 73.2 mm (2.9 in). 050100150200200020102020Record: 179.6 mm (7.1 in) in 1996
The wettest day of the year at Groveland, 1992 to 2026. The record is 179.6 mm (7.1 in) in 1996, marked on the chart; the median year is 73.2 mm (2.9 in).
Wettest day (Rx1day) at Groveland by year
YearWettest day (Rx1day)
199256.6 mm (2.2 in)
199355.9 mm (2.2 in)
1994139.2 mm (5.5 in)
199550.8 mm (2.0 in)
1996179.6 mm (7.1 in)
199760.7 mm (2.4 in)
1998100.1 mm (3.9 in)
199981.8 mm (3.2 in)
200073.2 mm (2.9 in)
2001126.7 mm (5.0 in)
200259.7 mm (2.4 in)
200342.4 mm (1.7 in)
2004110.2 mm (4.3 in)
200590.7 mm (3.6 in)
2006115.3 mm (4.5 in)
200782.6 mm (3.3 in)
200873.2 mm (2.9 in)
200971.6 mm (2.8 in)
2010172.5 mm (6.8 in)
201185.9 mm (3.4 in)
201284.3 mm (3.3 in)
201345.5 mm (1.8 in)
201498.8 mm (3.9 in)
201565.3 mm (2.6 in)
201650.0 mm (2.0 in)
201749.8 mm (2.0 in)
201883.6 mm (3.3 in)
201962.7 mm (2.5 in)
202076.5 mm (3.0 in)
202191.7 mm (3.6 in)
202248.3 mm (1.9 in)
2023124.5 mm (4.9 in)
202458.9 mm (2.3 in)
202534.3 mm (1.4 in)
202635.8 mm (1.4 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Groveland by year The wettest five days of the year at Groveland, 1992 to 2026. The record is 316.5 mm (12.5 in) in 1996, marked on the chart; the median year is 101.1 mm (4.0 in). 0100200300400200020102020Record: 316.5 mm (12.5 in) in 1996
The wettest five days of the year at Groveland, 1992 to 2026. The record is 316.5 mm (12.5 in) in 1996, marked on the chart; the median year is 101.1 mm (4.0 in).
Wettest five days (Rx5day) at Groveland by year
YearWettest five days (Rx5day)
199283.8 mm (3.3 in)
199386.4 mm (3.4 in)
1994145.3 mm (5.7 in)
199598.7 mm (3.9 in)
1996316.5 mm (12.5 in)
199785.4 mm (3.4 in)
1998178.8 mm (7.0 in)
1999104.9 mm (4.1 in)
2000121.3 mm (4.8 in)
2001135.6 mm (5.3 in)
200284.1 mm (3.3 in)
200374.5 mm (2.9 in)
2004173.3 mm (6.8 in)
2005159.6 mm (6.3 in)
2006258.3 mm (10.2 in)
2007129.6 mm (5.1 in)
2008133.2 mm (5.2 in)
200988.4 mm (3.5 in)
2010266.2 mm (10.5 in)
201191.9 mm (3.6 in)
2012100.6 mm (4.0 in)
2013106.7 mm (4.2 in)
2014139.9 mm (5.5 in)
2015103.7 mm (4.1 in)
201694.2 mm (3.7 in)
201777.8 mm (3.1 in)
201885.8 mm (3.4 in)
201962.7 mm (2.5 in)
202086.1 mm (3.4 in)
2021122.2 mm (4.8 in)
202273.6 mm (2.9 in)
2023174.1 mm (6.9 in)
2024101.1 mm (4.0 in)
202554.4 mm (2.1 in)
202664.5 mm (2.5 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Groveland by year The longest dry spell of the year at Groveland, 1992 to 2026. The record is 33 days in 1999, marked on the chart; the median year is 16 days. 10203040200020102020Record: 33 days in 1999
The longest dry spell of the year at Groveland, 1992 to 2026. The record is 33 days in 1999, marked on the chart; the median year is 16 days.
Longest dry spell (CDD) at Groveland by year
YearLongest dry spell (CDD)
199214 days
199320 days
199413 days
199520 days
199612 days
199718 days
199817 days
199933 days
200011 days
200123 days
200217 days
200322 days
200413 days
200513 days
200617 days
200721 days
200820 days
200915 days
201016 days
201112 days
201220 days
201321 days
201413 days
201521 days
201617 days
201714 days
201814 days
201912 days
202017 days
202116 days
202214 days
202316 days
202418 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

33 years with a frost

Across 33 years with a frost, the median last spring frost at Groveland falls on 9 May and the median first autumn frost on 9 October, which leaves a median of 153 days between them.

Fitted over all years, the growing season changes by +9.5 days per decade at this station.

Frost dates and growing season at Groveland
MeasureMedian, all yearsEarliest periodRecent period (1996 to 2025)Recent against earliestFitted trend
Last spring frost9 Mayn/a8 Mayn/a-4.7 days per decade
First autumn frost9 Octobern/a9 Octobern/a+4.7 days per decade
Growing days153 daysn/a154 daysn/a+9.5 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

33 years, 1993 to 2025

A day with at least 75.3 mm (3.0 in) of rain is expected about once in 2 years. A day with at least 213.4 mm (8.4 in) of rain is expected about once in 100 years.

Rainfall return levels at Groveland: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years75.3 mm (3.0 in)
5 years106.6 mm (4.2 in)
10 years129.4 mm (5.1 in)
25 years160.9 mm (6.3 in)
50 years186.3 mm (7.3 in)Longer than the 33 years of record
100 years213.4 mm (8.4 in)Longer than the 33 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, 33 years of values from 1993 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: 179.6 mm (7.1 in) in 1996; 172.5 mm (6.8 in) in 2010; 139.2 mm (5.5 in) in 1994.

Download the Data

  • Data for Groveland standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Groveland 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 2026-10-16 (16 October 2026). Records are computed by this site and are not official.

Data as of . Last revised (2026-10-16).