Built 2026-10-16 (16 October 2026)

Graterford 1 E Weather Records (USC00363437)

Record envelope, standing records and threshold days for Graterford 1 E (USC00363437), Pennsylvania, United States, with 63 years of record.

Key Facts for Graterford 1 E

  • Graterford 1 E (USC00363437) is a weather station in Pennsylvania, United States at 40.23 latitude and -75.42 longitude, 85 m (279 ft) above sea level.
  • The station reports from 1960 to 2022, 63 years of record.
  • 1,464 records set at Graterford 1 E still stand.
  • Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
  • Graterford 1 E set a daily record snow depth of 2.5 cm (1.0 in) on 14 February 2022.

About the Station

  • Location: Pennsylvania, United States, 40.23 latitude, -75.42 longitude.
  • Elevation: 85 m (279 ft).
  • Period of record: 1960 to 2022, 63 years.
  • Eligible elements: tmax, tmin, prcp, snow, snwd.

Daily Record Envelope and 2026

0 days at or beyond a record
Daily record high and record low at Graterford 1 E, with 2026 drawn through them The band shows the record high and record low for each calendar day at Graterford 1 E. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius. -40-200204060 JanFebMarAprMayJunJulAugSepOctNovDec
The band shows the record high and record low for each calendar day at Graterford 1 E. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Graterford 1 E, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan22.2 C (72.0 F)-27.2 C (-17.0 F)n/an/a
Feb25.6 C (78.1 F)-23.9 C (-11.0 F)n/an/a
Mar30.6 C (87.1 F)-18.9 C (-2.0 F)n/an/a
Apr35.6 C (96.1 F)-10.6 C (12.9 F)n/an/a
May35.0 C (95.0 F)-6.1 C (21.0 F)n/an/a
Jun37.2 C (99.0 F)-2.2 C (28.0 F)n/an/a
Jul41.1 C (106.0 F)1.7 C (35.1 F)n/an/a
Aug38.3 C (100.9 F)-2.2 C (28.0 F)n/an/a
Sep37.2 C (99.0 F)-5.6 C (21.9 F)n/an/a
Oct33.3 C (91.9 F)-12.2 C (10.0 F)n/an/a
Nov27.8 C (82.0 F)-13.9 C (7.0 F)n/an/a
Dec28.9 C (84.0 F)-21.7 C (-7.1 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Graterford 1 E by the year they were set 1,464 records at Graterford 1 E still stand. 1987 holds the most, with 93. 02550751001960: 131961: 171962: 211963: 341964: 281965: 221966: 311967: 351968: 141969: 181970: 161971: 161972: 81973: 201974: 231975: 161976: 291977: 261978: 151979: 421980: 161981: 91982: 161983: 311984: 601985: 111986: 201987: 931988: 271989: 471990: 321991: 281992: 191993: 361994: 231995: 251996: 191997: 91998: 271999: 542000: 442001: 142002: 332003: 122004: 172005: 122006: 252007: 322008: 132009: 112010: 62011: 172012: 242013: 172014: 162015: 282016: 212017: 222018: 302019: 102020: 52021: 82022: 1196019671974198119881995200220092016
1,464 records at Graterford 1 E still stand. 1987 holds the most, with 93.
Standing records at Graterford 1 E by the year they were set
Year setStanding records
196013
196117
196221
196334
196428
196522
196631
196735
196814
196918
197016
197116
19728
197320
197423
197516
197629
197726
197815
197942
198016
19819
198216
198331
198460
198511
198620
198793
198827
198947
199032
199128
199219
199336
199423
199525
199619
19979
199827
199954
200044
200114
200233
200312
200417
200512
200625
200732
200813
200911
20106
201117
201224
201317
201416
201528
201621
201722
201830
201910
20205
20218
20221

All-Time Record Progression

5 new records
When Graterford 1 E set new all-time records 5 all-time records were set at Graterford 1 E between 19 January 1994 and 28 August 2011. Each dot is a new record. Record low minimum temperatureRecord high maximum temperatureRecord daily precipitation19 January 1994: Record low minimum temperature -26.7 C (-16.1 F)20 January 1994: Record low minimum temperature -27.2 C (-17.0 F)18 July 1999: Record high maximum temperature 41.1 C (106.0 F)17 September 1999: Record daily precipitation 149.9 mm (5.9 in)28 August 2011: Record daily precipitation 171.4 mm (6.7 in)1995200020052010
5 all-time records were set at Graterford 1 E between 19 January 1994 and 28 August 2011. Each dot is a new record.
When Graterford 1 E set new all-time records
DateKindDetail
1994-01-19Record low minimum temperatureRecord low minimum temperature -26.7 C (-16.1 F)
1994-01-20Record low minimum temperatureRecord low minimum temperature -27.2 C (-17.0 F)
1999-07-18Record high maximum temperatureRecord high maximum temperature 41.1 C (106.0 F)
1999-09-17Record daily precipitationRecord daily precipitation 149.9 mm (5.9 in)
2011-08-28Record daily precipitationRecord daily precipitation 171.4 mm (6.7 in)

Wettest Day of Each Month

Aug: 171.4 mm (6.7 in)
Record daily precipitation for each month at Graterford 1 E The wettest day on record for each calendar month at Graterford 1 E. The most was 171.4 mm (6.7 in) on 28 August 2011. 050100150200 Jan: 67.1 mm (2.6 in), 25 January 1979 Jan Feb: 58.2 mm (2.3 in), 23 February 2003 Feb Mar: 82.0 mm (3.2 in), 22 March 2000 Mar Apr: 101.6 mm (4.0 in), 16 April 2007 Apr May: 108.5 mm (4.3 in), 1 May 2014 May Jun: 91.2 mm (3.6 in), 25 June 2006 Jun Jul: 81.0 mm (3.2 in), 13 July 2004 Jul Aug: 171.4 mm (6.7 in), 28 August 2011 Aug Sep: 149.9 mm (5.9 in), 17 September 1999 Sep Oct: 86.4 mm (3.4 in), 8 October 2005 Oct Nov: 69.3 mm (2.7 in), 7 November 1963 Nov Dec: 77.5 mm (3.1 in), 12 December 2008 Dec
The wettest day on record for each calendar month at Graterford 1 E. The most was 171.4 mm (6.7 in) on 28 August 2011.
Record daily precipitation for each month at Graterford 1 E
MonthRecord daily precipitation (mm)Date
Jan67.1 mm (2.6 in)25 January 1979
Feb58.2 mm (2.3 in)23 February 2003
Mar82.0 mm (3.2 in)22 March 2000
Apr101.6 mm (4.0 in)16 April 2007
May108.5 mm (4.3 in)1 May 2014
Jun91.2 mm (3.6 in)25 June 2006
Jul81.0 mm (3.2 in)13 July 2004
Aug171.4 mm (6.7 in)28 August 2011
Sep149.9 mm (5.9 in)17 September 1999
Oct86.4 mm (3.4 in)8 October 2005
Nov69.3 mm (2.7 in)7 November 1963
Dec77.5 mm (3.1 in)12 December 2008

Period of Record Coverage

1960 to 2022
Days with data per year at Graterford 1 E 63 years of record at Graterford 1 E, 1960 to 2022. 12 years have data for under 90 percent of days and are left out of rankings: 1960, 1971, 1972, 1980, 1981, 1996, 1998, 2008 and others. 1960: 96 of 366 days1961: 365 of 365 days1962: 365 of 365 days1963: 365 of 365 days1964: 366 of 366 days1965: 365 of 365 days1966: 365 of 365 days1967: 365 of 365 days1968: 335 of 366 days1969: 365 of 365 days1970: 330 of 365 days1971: 297 of 365 days1972: 232 of 366 days1973: 349 of 365 days1974: 329 of 365 days1975: 357 of 365 days1976: 366 of 366 days1977: 329 of 365 days1978: 338 of 365 days1979: 340 of 365 days1980: 319 of 366 days1981: 325 of 365 days1982: 335 of 365 days1983: 350 of 365 days1984: 366 of 366 days1985: 365 of 365 days1986: 365 of 365 days1987: 365 of 365 days1988: 365 of 366 days1989: 364 of 365 days1990: 365 of 365 days1991: 364 of 365 days1992: 366 of 366 days1993: 362 of 365 days1994: 365 of 365 days1995: 358 of 365 days1996: 206 of 366 days1997: 345 of 365 days1998: 328 of 365 days1999: 363 of 365 days2000: 350 of 366 days2001: 332 of 365 days2002: 364 of 365 days2003: 330 of 365 days2004: 366 of 366 days2005: 364 of 365 days2006: 365 of 365 days2007: 361 of 365 days2008: 269 of 366 days2009: 334 of 365 days2010: 92 of 365 days2011: 355 of 365 days2012: 352 of 366 days2013: 359 of 365 days2014: 365 of 365 days2015: 358 of 365 days2016: 362 of 366 days2017: 358 of 365 days2018: 363 of 365 days2019: 348 of 365 days2020: 209 of 366 days2021: 302 of 365 days2022: 43 of 365 days1960197019801990200020102020
63 years of record at Graterford 1 E, 1960 to 2022. 12 years have data for under 90 percent of days and are left out of rankings: 1960, 1971, 1972, 1980, 1981, 1996, 1998, 2008 and others.
Days with data per year at Graterford 1 E
YearDays with dataShare of yearComplete
19609626%No
1961365100%Yes
1962365100%Yes
1963365100%Yes
1964366100%Yes
1965365100%Yes
1966365100%Yes
1967365100%Yes
196833592%Yes
1969365100%Yes
197033090%Yes
197129781%No
197223263%No
197334996%Yes
197432990%Yes
197535798%Yes
1976366100%Yes
197732990%Yes
197833893%Yes
197934093%Yes
198031987%No
198132589%No
198233592%Yes
198335096%Yes
1984366100%Yes
1985365100%Yes
1986365100%Yes
1987365100%Yes
1988365100%Yes
1989364100%Yes
1990365100%Yes
1991364100%Yes
1992366100%Yes
199336299%Yes
1994365100%Yes
199535898%Yes
199620656%No
199734595%Yes
199832890%No
199936399%Yes
200035096%Yes
200133291%Yes
2002364100%Yes
200333090%Yes
2004366100%Yes
2005364100%Yes
2006365100%Yes
200736199%Yes
200826973%No
200933492%Yes
20109225%No
201135597%Yes
201235296%Yes
201335998%Yes
2014365100%Yes
201535898%Yes
201636299%Yes
201735898%Yes
201836399%Yes
201934895%Yes
202020957%No
202130283%No
20224312%No

Latest Records

20
Latest records at Graterford 1 E
DateStationRecordValueBeat old record byOld record stoodSignificance
14 February 2022Graterford 1 E, USdaily snow depth2.5 cm (1.0 in)2.5 cm (1.0 in)56 years20 of 100 (Routine)
29 January 2022Graterford 1 E, USdaily snowfall6.4 cm (2.5 in)6.4 cm (2.5 in)60 years30 of 100 (Routine)
17 January 2022Graterford 1 E, USdaily snowfall4.3 cm (1.7 in)0.5 cm (0.2 in)4 years7 of 100 (Routine)
1 January 2022Graterford 1 E, USdaily high min9.4 C (48.9 F)0.5 C (0.9 F)48 years20 of 100 (Routine)
31 December 2021Graterford 1 E, USdaily high min7.8 C (46.0 F)3.4 C (6.1 F)6 years13 of 100 (Routine)
6 October 2021Graterford 1 E, USdaily high min16.1 C (61.0 F)0.5 C (0.9 F)48 years20 of 100 (Routine)
16 September 2021Graterford 1 E, USdaily high min (Tie)20.0 C (68.0 F)tie19 years2 of 100 (Routine)
27 August 2021Graterford 1 E, USdaily high min21.7 C (71.1 F)0.6 C (1.1 F)51 years22 of 100 (Routine)
22 August 2021Graterford 1 E, USdaily high min (Tie)21.1 C (70.0 F)tie12 years2 of 100 (Routine)
19 August 2021Graterford 1 E, USdaily rain67.3 mm (2.6 in)54.1 mm (2.1 in)12 years41 of 100 (Notable)
19 August 2021Graterford 1 E, USdaily high min22.8 C (73.0 F)1.1 C (2.0 F)6 years9 of 100 (Routine)
12 August 2021Graterford 1 E, USdaily high max (Tie)34.4 C (93.9 F)tie32 years3 of 100 (Routine)
11 August 2021Graterford 1 E, USdaily high max33.9 C (93.0 F)0.6 C (1.1 F)42 years19 of 100 (Routine)
7 June 2021Graterford 1 E, USdaily high min22.2 C (72.0 F)0.5 C (0.9 F)48 years21 of 100 (Routine)
3 June 2021Graterford 1 E, USdaily high max32.2 C (90.0 F)0.5 C (0.9 F)32 years16 of 100 (Routine)
3 April 2021Graterford 1 E, USdaily low max2.2 C (36.0 F)3.4 C (6.1 F)60 years29 of 100 (Routine)
16 February 2021Graterford 1 E, USdaily rain21.1 mm (0.8 in)3.3 mm (0.13 in)3 years9 of 100 (Routine)
8 February 2021Graterford 1 E, USdaily snowfall14.0 cm (5.5 in)1.3 cm (0.5 in)42 years19 of 100 (Routine)
17 December 2020Graterford 1 E, USdaily snow depth7.6 cm (3.0 in)2.5 cm (1.0 in)7 years10 of 100 (Routine)
12 November 2020Graterford 1 E, USdaily high min16.7 C (62.1 F)2.8 C (5.0 F)50 years26 of 100 (Routine)

Climate Trend

40 complete years, 1961 to 2018
Annual mean temperature at Graterford 1 E as warming stripes, 1961 to 2018 One stripe for each of 40 complete years at Graterford 1 E, 1961 to 2018. Blue stripes are years cooler than the station's own mean of 10.7 C (51.2 F); red stripes are warmer. The coolest year was 1987, at 7.9 C (46.1 F), and the warmest was 2006, at 12.7 C (54.9 F). The strongest colour marks a difference of 2.8 C (5.0 F). 1961: 10.2 C, -0.4 C from the station mean1962: 9.6 C, -1.1 C from the station mean1963: 9.7 C, -0.9 C from the station mean1964: 10.3 C, -0.4 C from the station mean1965: 10.0 C, -0.6 C from the station mean1966: 10.3 C, -0.3 C from the station mean1967: 9.6 C, -1.0 C from the station mean1969: 10.9 C, +0.3 C from the station mean1973: 12.5 C, +1.9 C from the station mean1975: 11.5 C, +0.8 C from the station mean1976: 10.7 C, +0.1 C from the station mean1977: 11.1 C, +0.4 C from the station mean1978: 9.8 C, -0.8 C from the station mean1979: 10.9 C, +0.2 C from the station mean1984: 9.3 C, -1.4 C from the station mean1985: 10.6 C, -0.1 C from the station mean1986: 10.2 C, -0.5 C from the station mean1987: 7.9 C, -2.8 C from the station mean1988: 9.5 C, -1.2 C from the station mean1989: 10.2 C, -0.5 C from the station mean1990: 11.7 C, +1.0 C from the station mean1991: 11.3 C, +0.6 C from the station mean1992: 9.0 C, -1.6 C from the station mean1993: 9.2 C, -1.5 C from the station mean1994: 9.3 C, -1.4 C from the station mean1995: 9.9 C, -0.7 C from the station mean1999: 10.2 C, -0.5 C from the station mean2002: 12.0 C, +1.4 C from the station mean2004: 11.5 C, +0.8 C from the station mean2005: 11.7 C, +1.0 C from the station mean2006: 12.7 C, +2.1 C from the station mean2007: 12.2 C, +1.5 C from the station mean2011: 11.6 C, +0.9 C from the station mean2012: 12.0 C, +1.4 C from the station mean2013: 10.8 C, +0.2 C from the station mean2014: 10.0 C, -0.7 C from the station mean2015: 11.3 C, +0.6 C from the station mean2016: 12.1 C, +1.4 C from the station mean2017: 11.7 C, +1.0 C from the station mean2018: 11.6 C, +1.0 C from the station mean196119651970197519801985199019952000200520102015
One stripe for each of 40 complete years at Graterford 1 E, 1961 to 2018. Blue stripes are years cooler than the station's own mean of 10.7 C (51.2 F); red stripes are warmer. The coolest year was 1987, at 7.9 C (46.1 F), and the warmest was 2006, at 12.7 C (54.9 F). The strongest colour marks a difference of 2.8 C (5.0 F).
Annual mean temperature at Graterford 1 E as warming stripes, 1961 to 2018
YearAnnual mean temperatureDifference from the station mean
196110.2 C-0.42 C
19629.6 C-1.09 C
19639.7 C-0.95 C
196410.3 C-0.38 C
196510.0 C-0.64 C
196610.3 C-0.33 C
19679.6 C-1.03 C
196910.9 C+0.26 C
197312.5 C+1.85 C
197511.5 C+0.79 C
197610.7 C+0.06 C
197711.1 C+0.42 C
19789.8 C-0.82 C
197910.9 C+0.19 C
19849.3 C-1.41 C
198510.6 C-0.07 C
198610.2 C-0.49 C
19877.9 C-2.80 C
19889.5 C-1.19 C
198910.2 C-0.46 C
199011.7 C+1.02 C
199111.3 C+0.59 C
19929.0 C-1.62 C
19939.2 C-1.49 C
19949.3 C-1.40 C
19959.9 C-0.75 C
199910.2 C-0.50 C
200212.0 C+1.37 C
200411.5 C+0.79 C
200511.7 C+1.03 C
200612.7 C+2.07 C
200712.2 C+1.54 C
201111.6 C+0.90 C
201212.0 C+1.38 C
201310.8 C+0.15 C
201410.0 C-0.69 C
201511.3 C+0.59 C
201612.1 C+1.41 C
201711.7 C+1.03 C
201811.6 C+0.97 C

The annual mean temperature here has risen by 0.3 C (0.1 to 0.4) per decade over 1961 to 2018. In Fahrenheit: 0.5 F (0.1 to 0.8) per decade. The slope is a straight line fitted to 40 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Graterford 1 E
MeasurePer decade (C)Per decade (F)PeriodComplete yearsReading
Annual mean temperature0.3 C (0.1 to 0.4) per decade0.5 F (0.1 to 0.8) per decade1961 to 201840Rise
Mean daily maximum0.3 C (0.1 to 0.5) per decade0.5 F (0.2 to 0.8) per decade1961 to 201840Rise
Mean daily minimum0.2 C (-0.1 to 0.5) per decade0.4 F (-0.1 to 0.9) per decade1961 to 201840Not 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

1960 to 2022
Yearly extremes at Graterford 1 E: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)41.1 C (106.0 F)199935.6 C (96.1 F)63
Coldest night (TNn)-27.2 C (-17.0 F)1994-17.8 C (0.0 F)63
Wettest day (Rx1day)171.4 mm (6.7 in)201165.0 mm (2.6 in)63
Wettest five days (Rx5day)226.3 mm (8.9 in)200689.9 mm (3.5 in)63
Longest dry spell (CDD)32 days198817 days63

Hottest day (TXx)

Hottest day (TXx) at Graterford 1 E by year The hottest day of the year at Graterford 1 E, 1960 to 2022. The record is 41.1 C (106.0 F) in 1999, marked on the chart; the median year is 35.6 C (96.1 F). 10203040501960198020002020Record: 41.1 C (106.0 F) in 1999
The hottest day of the year at Graterford 1 E, 1960 to 2022. The record is 41.1 C (106.0 F) in 1999, marked on the chart; the median year is 35.6 C (96.1 F).
Hottest day (TXx) at Graterford 1 E by year
YearHottest day (TXx)
196027.2 C (81.0 F)
196133.3 C (91.9 F)
196235.0 C (95.0 F)
196336.1 C (97.0 F)
196436.7 C (98.1 F)
196535.0 C (95.0 F)
196639.4 C (102.9 F)
196735.0 C (95.0 F)
196835.6 C (96.1 F)
196935.6 C (96.1 F)
197036.7 C (98.1 F)
197135.0 C (95.0 F)
197234.4 C (93.9 F)
197336.1 C (97.0 F)
197434.4 C (93.9 F)
197536.1 C (97.0 F)
197633.9 C (93.0 F)
197736.7 C (98.1 F)
197835.0 C (95.0 F)
197933.3 C (91.9 F)
198037.2 C (99.0 F)
198133.9 C (93.0 F)
198234.4 C (93.9 F)
198337.2 C (99.0 F)
198436.1 C (97.0 F)
198532.8 C (91.0 F)
198635.0 C (95.0 F)
198735.6 C (96.1 F)
198836.1 C (97.0 F)
198934.4 C (93.9 F)
199035.6 C (96.1 F)
199135.6 C (96.1 F)
199233.9 C (93.0 F)
199336.7 C (98.1 F)
199437.2 C (99.0 F)
199538.3 C (100.9 F)
199626.7 C (80.1 F)
199736.1 C (97.0 F)
199837.2 C (99.0 F)
199941.1 C (106.0 F)
200032.8 C (91.0 F)
200133.9 C (93.0 F)
200238.3 C (100.9 F)
200333.9 C (93.0 F)
200433.3 C (91.9 F)
200536.1 C (97.0 F)
200635.6 C (96.1 F)
200737.2 C (99.0 F)
200834.4 C (93.9 F)
200932.2 C (90.0 F)
201030.0 C (86.0 F)
201138.9 C (102.0 F)
201237.8 C (100.0 F)
201335.6 C (96.1 F)
201433.3 C (91.9 F)
201534.4 C (93.9 F)
201635.6 C (96.1 F)
201734.4 C (93.9 F)
201836.7 C (98.1 F)
201935.6 C (96.1 F)
202033.9 C (93.0 F)
202135.0 C (95.0 F)
202215.0 C (59.0 F)

Coldest night (TNn)

Coldest night (TNn) at Graterford 1 E by year The coldest night of the year at Graterford 1 E, 1960 to 2022. The record is -27.2 C (-17.0 F) in 1994, marked on the chart; the median year is -17.8 C (0.0 F). -30-25-20-15-101960198020002020Record: -27.2 C (-17.0 F) in 1994
The coldest night of the year at Graterford 1 E, 1960 to 2022. The record is -27.2 C (-17.0 F) in 1994, marked on the chart; the median year is -17.8 C (0.0 F).
Coldest night (TNn) at Graterford 1 E by year
YearColdest night (TNn)
1960-19.4 C (-2.9 F)
1961-24.4 C (-11.9 F)
1962-20.6 C (-5.1 F)
1963-20.0 C (-4.0 F)
1964-20.0 C (-4.0 F)
1965-18.3 C (-0.9 F)
1966-17.8 C (0.0 F)
1967-22.2 C (-8.0 F)
1968-20.6 C (-5.1 F)
1969-13.3 C (8.1 F)
1970-17.8 C (0.0 F)
1971-15.6 C (3.9 F)
1972-15.6 C (3.9 F)
1973-14.4 C (6.1 F)
1974-13.9 C (7.0 F)
1975-15.6 C (3.9 F)
1976-16.7 C (1.9 F)
1977-20.6 C (-5.1 F)
1978-20.6 C (-5.1 F)
1979-23.3 C (-9.9 F)
1980-15.6 C (3.9 F)
1981-17.8 C (0.0 F)
1982-23.9 C (-11.0 F)
1983-21.7 C (-7.1 F)
1984-23.9 C (-11.0 F)
1985-22.2 C (-8.0 F)
1986-15.0 C (5.0 F)
1987-22.8 C (-9.0 F)
1988-18.9 C (-2.0 F)
1989-17.2 C (1.0 F)
1990-15.0 C (5.0 F)
1991-15.6 C (3.9 F)
1992-20.6 C (-5.1 F)
1993-22.8 C (-9.0 F)
1994-27.2 C (-17.0 F)
1995-20.0 C (-4.0 F)
1996-21.1 C (-6.0 F)
1997-12.2 C (10.0 F)
1998-17.8 C (0.0 F)
1999-23.9 C (-11.0 F)
2000-17.2 C (1.0 F)
2001-16.7 C (1.9 F)
2002-17.8 C (0.0 F)
2003-17.2 C (1.0 F)
2004-22.2 C (-8.0 F)
2005-19.4 C (-2.9 F)
2006-12.2 C (10.0 F)
2007-16.7 C (1.9 F)
2008-15.6 C (3.9 F)
2009-13.9 C (7.0 F)
2010-12.2 C (10.0 F)
2011-20.0 C (-4.0 F)
2012-14.4 C (6.1 F)
2013-17.2 C (1.0 F)
2014-21.1 C (-6.0 F)
2015-18.9 C (-2.0 F)
2016-15.6 C (3.9 F)
2017-15.0 C (5.0 F)
2018-19.4 C (-2.9 F)
2019-18.9 C (-2.0 F)
2020-12.8 C (9.0 F)
2021-11.1 C (12.0 F)
2022-15.6 C (3.9 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at Graterford 1 E by year The wettest day of the year at Graterford 1 E, 1960 to 2022. The record is 171.4 mm (6.7 in) in 2011, marked on the chart; the median year is 65.0 mm (2.6 in). 0501001502001960198020002020Record: 171.4 mm (6.7 in) in 2011
The wettest day of the year at Graterford 1 E, 1960 to 2022. The record is 171.4 mm (6.7 in) in 2011, marked on the chart; the median year is 65.0 mm (2.6 in).
Wettest day (Rx1day) at Graterford 1 E by year
YearWettest day (Rx1day)
196056.6 mm (2.2 in)
196157.7 mm (2.3 in)
196247.0 mm (1.9 in)
196369.3 mm (2.7 in)
196445.7 mm (1.8 in)
196555.4 mm (2.2 in)
196679.5 mm (3.1 in)
196757.4 mm (2.3 in)
196871.6 mm (2.8 in)
196969.1 mm (2.7 in)
197050.8 mm (2.0 in)
1971133.4 mm (5.3 in)
197261.2 mm (2.4 in)
197376.2 mm (3.0 in)
197469.1 mm (2.7 in)
197565.0 mm (2.6 in)
197636.3 mm (1.4 in)
197750.8 mm (2.0 in)
197866.0 mm (2.6 in)
197975.2 mm (3.0 in)
198039.6 mm (1.6 in)
198149.8 mm (2.0 in)
198263.5 mm (2.5 in)
198367.1 mm (2.6 in)
198459.7 mm (2.4 in)
1985109.2 mm (4.3 in)
198654.4 mm (2.1 in)
198749.0 mm (1.9 in)
198861.0 mm (2.4 in)
1989110.0 mm (4.3 in)
199092.5 mm (3.6 in)
199173.9 mm (2.9 in)
199255.1 mm (2.2 in)
199370.1 mm (2.8 in)
199450.8 mm (2.0 in)
199576.2 mm (3.0 in)
199666.0 mm (2.6 in)
199782.8 mm (3.3 in)
199855.9 mm (2.2 in)
1999149.9 mm (5.9 in)
200082.0 mm (3.2 in)
200172.1 mm (2.8 in)
200250.3 mm (2.0 in)
200388.9 mm (3.5 in)
2004103.9 mm (4.1 in)
200586.4 mm (3.4 in)
200691.2 mm (3.6 in)
2007101.6 mm (4.0 in)
200877.5 mm (3.1 in)
200955.1 mm (2.2 in)
201033.3 mm (1.3 in)
2011171.4 mm (6.7 in)
201261.0 mm (2.4 in)
201361.0 mm (2.4 in)
2014108.5 mm (4.3 in)
201548.8 mm (1.9 in)
201643.2 mm (1.7 in)
201758.4 mm (2.3 in)
201850.8 mm (2.0 in)
201950.0 mm (2.0 in)
202073.7 mm (2.9 in)
202167.3 mm (2.6 in)
20221.0 mm (0.04 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Graterford 1 E by year The wettest five days of the year at Graterford 1 E, 1960 to 2022. The record is 226.3 mm (8.9 in) in 2006, marked on the chart; the median year is 89.9 mm (3.5 in). 01002003001960198020002020Record: 226.3 mm (8.9 in) in 2006
The wettest five days of the year at Graterford 1 E, 1960 to 2022. The record is 226.3 mm (8.9 in) in 2006, marked on the chart; the median year is 89.9 mm (3.5 in).
Wettest five days (Rx5day) at Graterford 1 E by year
YearWettest five days (Rx5day)
1960110.8 mm (4.4 in)
1961102.6 mm (4.0 in)
196287.1 mm (3.4 in)
196399.1 mm (3.9 in)
196465.0 mm (2.6 in)
196567.6 mm (2.7 in)
196682.6 mm (3.3 in)
196783.8 mm (3.3 in)
196886.6 mm (3.4 in)
196996.0 mm (3.8 in)
197087.4 mm (3.4 in)
1971170.2 mm (6.7 in)
1972106.8 mm (4.2 in)
197381.8 mm (3.2 in)
197476.7 mm (3.0 in)
1975131.3 mm (5.2 in)
197659.7 mm (2.4 in)
197789.9 mm (3.5 in)
197867.5 mm (2.7 in)
1979135.4 mm (5.3 in)
198068.8 mm (2.7 in)
198190.9 mm (3.6 in)
1982116.9 mm (4.6 in)
198383.8 mm (3.3 in)
198486.3 mm (3.4 in)
1985150.8 mm (5.9 in)
198679.0 mm (3.1 in)
198768.8 mm (2.7 in)
1988142.2 mm (5.6 in)
1989163.6 mm (6.4 in)
1990107.0 mm (4.2 in)
1991105.7 mm (4.2 in)
199279.3 mm (3.1 in)
199388.4 mm (3.5 in)
199485.3 mm (3.4 in)
199583.7 mm (3.3 in)
1996102.9 mm (4.1 in)
199782.8 mm (3.3 in)
199883.0 mm (3.3 in)
1999200.7 mm (7.9 in)
2000130.1 mm (5.1 in)
200184.1 mm (3.3 in)
200295.8 mm (3.8 in)
2003126.8 mm (5.0 in)
2004166.9 mm (6.6 in)
2005147.7 mm (5.8 in)
2006226.3 mm (8.9 in)
2007155.4 mm (6.1 in)
200899.3 mm (3.9 in)
200996.2 mm (3.8 in)
201062.3 mm (2.5 in)
2011181.1 mm (7.1 in)
201279.8 mm (3.1 in)
201398.3 mm (3.9 in)
2014146.4 mm (5.8 in)
201589.2 mm (3.5 in)
201678.3 mm (3.1 in)
201794.3 mm (3.7 in)
201892.4 mm (3.6 in)
201972.9 mm (2.9 in)
202086.4 mm (3.4 in)
202111.2 mm (0.4 in)
20221.0 mm (0.04 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Graterford 1 E by year The longest dry spell of the year at Graterford 1 E, 1960 to 2022. The record is 32 days in 1988, marked on the chart; the median year is 17 days. 0102030401960198020002020Record: 32 days in 1988
The longest dry spell of the year at Graterford 1 E, 1960 to 2022. The record is 32 days in 1988, marked on the chart; the median year is 17 days.
Longest dry spell (CDD) at Graterford 1 E by year
YearLongest dry spell (CDD)
196019 days
196115 days
196229 days
196327 days
196418 days
196516 days
196615 days
196719 days
196825 days
196917 days
197021 days
197121 days
197211 days
197325 days
197415 days
197515 days
197623 days
197718 days
197819 days
197913 days
198023 days
198115 days
198220 days
198318 days
198419 days
198519 days
198619 days
198728 days
198832 days
198918 days
199017 days
199123 days
199213 days
199311 days
199418 days
199525 days
19969 days
199718 days
199826 days
199917 days
200031 days
200125 days
200213 days
200311 days
200428 days
200517 days
200616 days
200716 days
200814 days
200917 days
201016 days
201117 days
201215 days
201314 days
201414 days
201518 days
201619 days
201717 days
201811 days
201910 days
20209 days
20219 days
20226 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

40 years with a frost

Across 40 years with a frost, the median last spring frost at Graterford 1 E falls on 26 April and the median first autumn frost on 13 October, which leaves a median of 168 days between them.

Fitted over all years, the growing season changes by +1.0 days per decade at this station.

Frost dates and growing season at Graterford 1 E
MeasureMedian, all yearsEarliest periodRecent period (1976 to 2018)Recent against earliestFitted trend
Last spring frost26 Apriln/a28 Apriln/a-0.7 days per decade
First autumn frost13 Octobern/a12 Octobern/a+0.3 days per decade
Growing days168 daysn/a168 daysn/a+1.0 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

52 years, 1961 to 2019

A day with at least 64.2 mm (2.5 in) of rain is expected about once in 2 years. A day with at least 172.6 mm (6.8 in) of rain is expected about once in 100 years.

Rainfall return levels at Graterford 1 E: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years64.2 mm (2.5 in)
5 years85.3 mm (3.4 in)
10 years102.1 mm (4.0 in)
25 years126.9 mm (5.0 in)
50 years148.3 mm (5.8 in)
100 years172.6 mm (6.8 in)Longer than the 52 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, 52 years of values from 1961 to 2019.

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: 171.4 mm (6.7 in) in 2011; 149.9 mm (5.9 in) in 1999; 110.0 mm (4.3 in) in 1989.

Station Changes

No change in the annual mean temperature of this station was found against its neighbours.

Download the Data

  • Data for Graterford 1 E standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Graterford 1 E 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 (2025-12-31).