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Port Allegany Weather Records (USC00367103)

Record envelope, standing records and threshold days for Port Allegany (USC00367103), Pennsylvania, United States, with 79 years of record.

Key Facts for Port Allegany

  • Port Allegany (USC00367103) is a weather station in Pennsylvania, United States at 41.82 latitude and -78.29 longitude, 450 m (1,475 ft) above sea level.
  • The station reports from 1948 to 2026, 79 years of record.
  • 1,464 records set at Port Allegany still stand.
  • Records are tracked for prcp, snow, snwd: an element needs 30 years of data to be eligible.
  • Port Allegany set a daily record precipitation of 25.9 mm (1.0 in) on 11 August 2026.

About the Station

  • Location: Pennsylvania, United States, 41.82 latitude, -78.29 longitude.
  • Elevation: 450 m (1,475 ft).
  • Period of record: 1948 to 2026, 79 years.
  • Eligible elements: prcp, snow, snwd.

Daily Record Envelope and 2026

31 days at or beyond a record
Daily record high and record low at Port Allegany, with 2026 drawn through them The band shows the record high and record low for each calendar day at Port Allegany. The lines show the 2026 daily maximum and minimum. 31 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 Port Allegany. The lines show the 2026 daily maximum and minimum. 31 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Port Allegany, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan18.3 C (64.9 F)-28.3 C (-18.9 F)10.6 C (51.1 F)-25.6 C (-14.1 F)
Feb22.2 C (72.0 F)-32.2 C (-26.0 F)11.1 C (52.0 F)-28.9 C (-20.0 F)
Mar25.6 C (78.1 F)-26.1 C (-15.0 F)22.8 C (73.0 F)-12.8 C (9.0 F)
Apr30.6 C (87.1 F)-11.1 C (12.0 F)26.7 C (80.1 F)-8.9 C (16.0 F)
May32.2 C (90.0 F)-6.1 C (21.0 F)31.1 C (88.0 F)-3.3 C (26.1 F)
Jun32.8 C (91.0 F)-0.6 C (30.9 F)30.6 C (87.1 F)2.2 C (36.0 F)
Jul37.2 C (99.0 F)2.8 C (37.0 F)33.9 C (93.0 F)6.7 C (44.1 F)
Aug32.8 C (91.0 F)2.8 C (37.0 F)28.9 C (84.0 F)7.2 C (45.0 F)
Sep32.2 C (90.0 F)-3.3 C (26.1 F)30.0 C (86.0 F)1.7 C (35.1 F)
Oct29.4 C (84.9 F)-8.9 C (16.0 F)25.6 C (78.1 F)-1.7 C (28.9 F)
Nov23.9 C (75.0 F)-15.6 C (3.9 F)n/an/a
Dec18.9 C (66.0 F)-22.8 C (-9.0 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Port Allegany by the year they were set 1,464 records at Port Allegany still stand. 2007 holds the most, with 90. 02550751001969: 141970: 121972: 51975: 101976: 112005: 772006: 662007: 902008: 732009: 672010: 542011: 572012: 662013: 782014: 752015: 872016: 612017: 852018: 622019: 372020: 522021: 392022: 472023: 542024: 662025: 692026: 50196919752006200920122015201820212024
1,464 records at Port Allegany still stand. 2007 holds the most, with 90.
Standing records at Port Allegany by the year they were set
Year setStanding records
196914
197012
19725
197510
197611
200577
200666
200790
200873
200967
201054
201157
201266
201378
201475
201587
201661
201785
201862
201937
202052
202139
202247
202354
202466
202569
202650

All-Time Record Progression

1 new records
When Port Allegany set new all-time records 1 all-time records were set at Port Allegany between 14 November 1995 and 14 November 1995. Each dot is a new record. Record daily snowfall14 November 1995: Record daily snowfall 41.9 cm (16.5 in)1995
1 all-time records were set at Port Allegany between 14 November 1995 and 14 November 1995. Each dot is a new record.
When Port Allegany set new all-time records
DateKindDetail
1995-11-14Record daily snowfallRecord daily snowfall 41.9 cm (16.5 in)

Wettest Day of Each Month

Jun: 119.4 mm (4.7 in)
Record daily precipitation for each month at Port Allegany The wettest day on record for each calendar month at Port Allegany. The most was 119.4 mm (4.7 in) on 21 June 1972. 050100150 Jan: 60.7 mm (2.4 in), 12 January 2018 Jan Feb: 41.1 mm (1.6 in), 14 February 1950 Feb Mar: 50.8 mm (2.0 in), 31 March 1974 Mar Apr: 47.8 mm (1.9 in), 12 April 2024 Apr May: 76.7 mm (3.0 in), 29 May 2009 May Jun: 119.4 mm (4.7 in), 21 June 1972 Jun Jul: 85.9 mm (3.4 in), 18 July 2021 Jul Aug: 100.1 mm (3.9 in), 13 August 1994 Aug Sep: 90.7 mm (3.6 in), 30 September 2015 Sep Oct: 70.4 mm (2.8 in), 20 October 1995 Oct Nov: 73.7 mm (2.9 in), 12 November 2022 Nov Dec: 95.0 mm (3.7 in), 1 December 2010 Dec
The wettest day on record for each calendar month at Port Allegany. The most was 119.4 mm (4.7 in) on 21 June 1972.
Record daily precipitation for each month at Port Allegany
MonthRecord daily precipitation (mm)Date
Jan60.7 mm (2.4 in)12 January 2018
Feb41.1 mm (1.6 in)14 February 1950
Mar50.8 mm (2.0 in)31 March 1974
Apr47.8 mm (1.9 in)12 April 2024
May76.7 mm (3.0 in)29 May 2009
Jun119.4 mm (4.7 in)21 June 1972
Jul85.9 mm (3.4 in)18 July 2021
Aug100.1 mm (3.9 in)13 August 1994
Sep90.7 mm (3.6 in)30 September 2015
Oct70.4 mm (2.8 in)20 October 1995
Nov73.7 mm (2.9 in)12 November 2022
Dec95.0 mm (3.7 in)1 December 2010

Period of Record Coverage

1969 to 2026
Days with data per year at Port Allegany 27 years of record at Port Allegany, 1969 to 2026. 7 years have data for under 90 percent of days and are left out of rankings: 1969, 1970, 1972, 1975, 1976, 2005, 2026. 1969: 61 of 365 days1970: 61 of 365 days1972: 29 of 366 days1975: 61 of 365 days1976: 29 of 366 days2005: 306 of 365 days2006: 364 of 365 days2007: 365 of 365 days2008: 366 of 366 days2009: 365 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: 334 of 365 days2022: 365 of 365 days2023: 365 of 365 days2024: 366 of 366 days2025: 365 of 365 days2026: 283 of 365 days1970197520052010201520202025
27 years of record at Port Allegany, 1969 to 2026. 7 years have data for under 90 percent of days and are left out of rankings: 1969, 1970, 1972, 1975, 1976, 2005, 2026.
Days with data per year at Port Allegany
YearDays with dataShare of yearComplete
19696117%No
19706117%No
1972298%No
19756117%No
1976298%No
200530684%No
2006364100%Yes
2007365100%Yes
2008366100%Yes
2009365100%Yes
2010365100%Yes
2011365100%Yes
2012366100%Yes
2013365100%Yes
2014365100%Yes
2015365100%Yes
2016366100%Yes
2017365100%Yes
2018365100%Yes
2019365100%Yes
2020366100%Yes
202133492%Yes
2022365100%Yes
2023365100%Yes
2024366100%Yes
2025365100%Yes
202628378%No

Latest Records

20
Latest records at Port Allegany
DateStationRecordValueBeat old record byOld record stoodSignificance
11 August 2026Port Allegany, USdaily rain25.9 mm (1.0 in)9.9 mm (0.39 in)31 years24 of 100 (Routine)
27 March 2026Port Allegany, USdaily rain21.6 mm (0.9 in)3.3 mm (0.13 in)24 years18 of 100 (Routine)
26 January 2026Port Allegany, USdaily snowfall18.8 cm (7.4 in)8.6 cm (3.4 in)27 years36 of 100 (Notable)
15 December 2025Port Allegany, USdaily snow depth (Tie)17.8 cm (7.0 in)tie32 years4 of 100 (Routine)
29 November 2025Port Allegany, USdaily snow depth (Tie)12.7 cm (5.0 in)tie75 years7 of 100 (Routine)
28 November 2025Port Allegany, USdaily snowfall10.4 cm (4.1 in)2.8 cm (1.1 in)48 years27 of 100 (Routine)
28 November 2025Port Allegany, USdaily snow depth (Tie)10.2 cm (4.0 in)tie48 years5 of 100 (Routine)
17 November 2025Port Allegany, USdaily snowfall5.1 cm (2.0 in)2.1 cm (0.8 in)4 years12 of 100 (Routine)
11 November 2025Port Allegany, USdaily snow depth (Tie)5.1 cm (2.0 in)tie30 years4 of 100 (Routine)
14 July 2025Port Allegany, USdaily rain25.4 mm (1.0 in)4.1 mm (0.16 in)28 years18 of 100 (Routine)
10 June 2025Port Allegany, USdaily rain26.2 mm (1.0 in)7.9 mm (0.31 in)48 years27 of 100 (Routine)
7 June 2025Port Allegany, USdaily rain54.4 mm (2.1 in)25.7 mm (1.0 in)52 years43 of 100 (Notable)
16 February 2025Port Allegany, USdaily rain38.1 mm (1.5 in)3.8 mm (0.15 in)9 years15 of 100 (Routine)
5 December 2024Port Allegany, USdaily snowfall9.4 cm (3.7 in)4.3 cm (1.7 in)33 years25 of 100 (Routine)
5 December 2024Port Allegany, USdaily snow depth (Tie)15.2 cm (6.0 in)tie32 years4 of 100 (Routine)
3 December 2024Port Allegany, USdaily snow depth15.2 cm (6.0 in)2.5 cm (1.0 in)75 years31 of 100 (Routine)
7 September 2024Port Allegany, USdaily rain26.9 mm (1.1 in)9.9 mm (0.39 in)16 years20 of 100 (Routine)
9 August 2024Port Allegany, USdaily rain29.2 mm (1.1 in)6.8 mm (0.27 in)15 years16 of 100 (Routine)
27 June 2024Port Allegany, USdaily rain40.6 mm (1.6 in)15.7 mm (0.6 in)37 years31 of 100 (Routine)
12 April 2024Port Allegany, USmonthly rain47.8 mm (1.9 in)6.4 mm (0.25 in)30 years35 of 100 (Notable)

Climate Trend

19 complete years, 2006 to 2025
Annual mean temperature at Port Allegany as warming stripes, 2006 to 2025 One stripe for each of 19 complete years at Port Allegany, 2006 to 2025. Blue stripes are years cooler than the station's own mean of 8.0 C (46.4 F); red stripes are warmer. The coolest year was 2014, at 6.6 C (43.9 F), and the warmest was 2024, at 9.3 C (48.7 F). The strongest colour marks a difference of 1.4 C (2.5 F). 2006: 8.6 C, +0.6 C from the station mean2007: 7.6 C, -0.4 C from the station mean2008: 7.3 C, -0.8 C from the station mean2009: 7.1 C, -0.9 C from the station mean2010: 8.1 C, +0.1 C from the station mean2011: 8.4 C, +0.4 C from the station mean2012: 9.3 C, +1.3 C from the station mean2013: 7.6 C, -0.4 C from the station mean2014: 6.6 C, -1.4 C from the station mean2015: 7.4 C, -0.6 C from the station mean2016: 8.4 C, +0.4 C from the station mean2017: 7.9 C, -0.1 C from the station mean2018: 7.9 C, -0.1 C from the station mean2019: 7.6 C, -0.4 C from the station mean2020: 8.4 C, +0.4 C from the station mean2022: 7.9 C, -0.1 C from the station mean2023: 9.0 C, +1.0 C from the station mean2024: 9.3 C, +1.3 C from the station mean2025: 7.9 C, -0.1 C from the station mean2006200820102012201420162018202020222024
One stripe for each of 19 complete years at Port Allegany, 2006 to 2025. Blue stripes are years cooler than the station's own mean of 8.0 C (46.4 F); red stripes are warmer. The coolest year was 2014, at 6.6 C (43.9 F), and the warmest was 2024, at 9.3 C (48.7 F). The strongest colour marks a difference of 1.4 C (2.5 F).
Annual mean temperature at Port Allegany as warming stripes, 2006 to 2025
YearAnnual mean temperatureDifference from the station mean
20068.6 C+0.60 C
20077.6 C-0.36 C
20087.3 C-0.75 C
20097.1 C-0.91 C
20108.1 C+0.07 C
20118.4 C+0.39 C
20129.3 C+1.26 C
20137.6 C-0.41 C
20146.6 C-1.38 C
20157.4 C-0.63 C
20168.4 C+0.40 C
20177.9 C-0.07 C
20187.9 C-0.14 C
20197.6 C-0.43 C
20208.4 C+0.40 C
20227.9 C-0.13 C
20239.0 C+0.97 C
20249.3 C+1.27 C
20257.9 C-0.12 C

This station does not have enough complete years (30 are needed) to fit a temperature trend.

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

1948 to 2026
Yearly extremes at Port Allegany: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)37.2 C (99.0 F)201132.2 C (90.0 F)27
Coldest night (TNn)-32.2 C (-26.0 F)2015-21.1 C (-6.0 F)27
Wettest day (Rx1day)119.4 mm (4.7 in)197252.0 mm (2.0 in)62
Wettest five days (Rx5day)277.4 mm (10.9 in)197281.5 mm (3.2 in)62
Longest dry spell (CDD)22 days198713 days62

Hottest day (TXx)

Hottest day (TXx) at Port Allegany by year The hottest day of the year at Port Allegany, 1948 to 2026. The record is 37.2 C (99.0 F) in 2011, marked on the chart; the median year is 32.2 C (90.0 F). 102030401960198020002020Record: 37.2 C (99.0 F) in 2011
The hottest day of the year at Port Allegany, 1948 to 2026. The record is 37.2 C (99.0 F) in 2011, marked on the chart; the median year is 32.2 C (90.0 F).
Hottest day (TXx) at Port Allegany by year
YearHottest day (TXx)
1948n/a
1949n/a
1950n/a
1951n/a
196931.7 C (89.1 F)
197031.7 C (89.1 F)
1971n/a
197215.6 C (60.1 F)
1973n/a
1974n/a
197530.0 C (86.0 F)
197618.3 C (64.9 F)
1977n/a
1978n/a
1979n/a
1980n/a
1981n/a
1982n/a
1983n/a
1984n/a
1985n/a
1986n/a
1987n/a
1988n/a
1989n/a
1990n/a
1991n/a
1992n/a
1993n/a
1994n/a
1995n/a
1996n/a
1997n/a
1998n/a
1999n/a
2000n/a
2001n/a
2002n/a
2003n/a
2004n/a
200532.2 C (90.0 F)
200632.8 C (91.0 F)
200732.8 C (91.0 F)
200832.2 C (90.0 F)
200931.1 C (88.0 F)
201033.3 C (91.9 F)
201137.2 C (99.0 F)
201232.8 C (91.0 F)
201332.2 C (90.0 F)
201430.6 C (87.1 F)
201531.1 C (88.0 F)
201631.1 C (88.0 F)
201730.6 C (87.1 F)
201832.2 C (90.0 F)
201931.7 C (89.1 F)
202032.2 C (90.0 F)
202130.6 C (87.1 F)
202232.8 C (91.0 F)
202331.7 C (89.1 F)
202432.2 C (90.0 F)
202532.8 C (91.0 F)
202633.9 C (93.0 F)

Coldest night (TNn)

Coldest night (TNn) at Port Allegany by year The coldest night of the year at Port Allegany, 1948 to 2026. The record is -32.2 C (-26.0 F) in 2015, marked on the chart; the median year is -21.1 C (-6.0 F). -40-30-20-1001960198020002020Record: -32.2 C (-26.0 F) in 2015
The coldest night of the year at Port Allegany, 1948 to 2026. The record is -32.2 C (-26.0 F) in 2015, marked on the chart; the median year is -21.1 C (-6.0 F).
Coldest night (TNn) at Port Allegany by year
YearColdest night (TNn)
1948n/a
1949n/a
1950n/a
1951n/a
1969-6.1 C (21.0 F)
1970-17.8 C (0.0 F)
1971n/a
1972-21.1 C (-6.0 F)
1973n/a
1974n/a
1975-8.9 C (16.0 F)
1976-21.1 C (-6.0 F)
1977n/a
1978n/a
1979n/a
1980n/a
1981n/a
1982n/a
1983n/a
1984n/a
1985n/a
1986n/a
1987n/a
1988n/a
1989n/a
1990n/a
1991n/a
1992n/a
1993n/a
1994n/a
1995n/a
1996n/a
1997n/a
1998n/a
1999n/a
2000n/a
2001n/a
2002n/a
2003n/a
2004n/a
2005-20.6 C (-5.1 F)
2006-18.3 C (-0.9 F)
2007-24.4 C (-11.9 F)
2008-20.0 C (-4.0 F)
2009-28.3 C (-18.9 F)
2010-24.4 C (-11.9 F)
2011-27.2 C (-17.0 F)
2012-20.6 C (-5.1 F)
2013-20.6 C (-5.1 F)
2014-28.3 C (-18.9 F)
2015-32.2 C (-26.0 F)
2016-22.8 C (-9.0 F)
2017-22.8 C (-9.0 F)
2018-27.8 C (-18.0 F)
2019-26.1 C (-15.0 F)
2020-20.6 C (-5.1 F)
2021-18.9 C (-2.0 F)
2022-26.7 C (-16.1 F)
2023-17.8 C (0.0 F)
2024-20.6 C (-5.1 F)
2025-24.4 C (-11.9 F)
2026-28.9 C (-20.0 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at Port Allegany by year The wettest day of the year at Port Allegany, 1948 to 2026. The record is 119.4 mm (4.7 in) in 1972, marked on the chart; the median year is 52.0 mm (2.0 in). 2550751001251960198020002020Record: 119.4 mm (4.7 in) in 1972
The wettest day of the year at Port Allegany, 1948 to 2026. The record is 119.4 mm (4.7 in) in 1972, marked on the chart; the median year is 52.0 mm (2.0 in).
Wettest day (Rx1day) at Port Allegany by year
YearWettest day (Rx1day)
194836.1 mm (1.4 in)
194952.1 mm (2.1 in)
195051.8 mm (2.0 in)
195139.6 mm (1.6 in)
196965.3 mm (2.6 in)
197039.6 mm (1.6 in)
197139.9 mm (1.6 in)
1972119.4 mm (4.7 in)
197351.1 mm (2.0 in)
197465.5 mm (2.6 in)
197548.3 mm (1.9 in)
197640.9 mm (1.6 in)
197757.2 mm (2.3 in)
197856.9 mm (2.2 in)
197948.0 mm (1.9 in)
198082.6 mm (3.3 in)
198172.4 mm (2.9 in)
198240.4 mm (1.6 in)
198357.2 mm (2.3 in)
198458.4 mm (2.3 in)
198530.5 mm (1.2 in)
198643.7 mm (1.7 in)
198747.5 mm (1.9 in)
198830.5 mm (1.2 in)
198964.3 mm (2.5 in)
199057.2 mm (2.3 in)
199141.4 mm (1.6 in)
199259.7 mm (2.4 in)
199356.4 mm (2.2 in)
1994100.1 mm (3.9 in)
199570.4 mm (2.8 in)
199650.8 mm (2.0 in)
199731.8 mm (1.3 in)
199857.9 mm (2.3 in)
199949.8 mm (2.0 in)
200037.6 mm (1.5 in)
200135.6 mm (1.4 in)
200253.6 mm (2.1 in)
200365.8 mm (2.6 in)
200479.5 mm (3.1 in)
200564.3 mm (2.5 in)
200650.8 mm (2.0 in)
200750.8 mm (2.0 in)
200832.5 mm (1.3 in)
200976.7 mm (3.0 in)
201095.0 mm (3.7 in)
201145.7 mm (1.8 in)
201255.1 mm (2.2 in)
201339.1 mm (1.5 in)
201447.2 mm (1.9 in)
201590.7 mm (3.6 in)
201661.2 mm (2.4 in)
201744.7 mm (1.8 in)
201860.7 mm (2.4 in)
201978.2 mm (3.1 in)
202039.4 mm (1.6 in)
202185.9 mm (3.4 in)
202273.7 mm (2.9 in)
202349.3 mm (1.9 in)
202447.8 mm (1.9 in)
202554.4 mm (2.1 in)
202638.6 mm (1.5 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Port Allegany by year The wettest five days of the year at Port Allegany, 1948 to 2026. The record is 277.4 mm (10.9 in) in 1972, marked on the chart; the median year is 81.5 mm (3.2 in). 01002003001960198020002020Record: 277.4 mm (10.9 in) in 1972
The wettest five days of the year at Port Allegany, 1948 to 2026. The record is 277.4 mm (10.9 in) in 1972, marked on the chart; the median year is 81.5 mm (3.2 in).
Wettest five days (Rx5day) at Port Allegany by year
YearWettest five days (Rx5day)
194872.4 mm (2.9 in)
194999.8 mm (3.9 in)
1950100.8 mm (4.0 in)
195173.3 mm (2.9 in)
196967.6 mm (2.7 in)
197063.2 mm (2.5 in)
197159.4 mm (2.3 in)
1972277.4 mm (10.9 in)
197379.2 mm (3.1 in)
197479.5 mm (3.1 in)
197585.5 mm (3.4 in)
197662.4 mm (2.5 in)
197795.8 mm (3.8 in)
197886.9 mm (3.4 in)
197957.7 mm (2.3 in)
198099.9 mm (3.9 in)
1981102.6 mm (4.0 in)
198272.1 mm (2.8 in)
198396.0 mm (3.8 in)
198476.7 mm (3.0 in)
198558.4 mm (2.3 in)
198692.5 mm (3.6 in)
198778.3 mm (3.1 in)
198870.9 mm (2.8 in)
198999.6 mm (3.9 in)
1990105.3 mm (4.1 in)
199163.0 mm (2.5 in)
199284.5 mm (3.3 in)
199379.8 mm (3.1 in)
1994152.9 mm (6.0 in)
199580.1 mm (3.2 in)
199687.6 mm (3.4 in)
199747.6 mm (1.9 in)
199871.1 mm (2.8 in)
199982.4 mm (3.2 in)
200064.2 mm (2.5 in)
200152.8 mm (2.1 in)
200275.0 mm (3.0 in)
2003141.0 mm (5.6 in)
200486.7 mm (3.4 in)
2005117.7 mm (4.6 in)
200683.6 mm (3.3 in)
200778.5 mm (3.1 in)
200860.5 mm (2.4 in)
2009101.1 mm (4.0 in)
2010110.7 mm (4.4 in)
201188.2 mm (3.5 in)
201270.9 mm (2.8 in)
201371.1 mm (2.8 in)
201480.6 mm (3.2 in)
2015109.6 mm (4.3 in)
2016106.0 mm (4.2 in)
201784.1 mm (3.3 in)
201893.2 mm (3.7 in)
2019108.7 mm (4.3 in)
202052.8 mm (2.1 in)
2021125.8 mm (5.0 in)
202284.1 mm (3.3 in)
202362.5 mm (2.5 in)
202471.5 mm (2.8 in)
2025128.3 mm (5.1 in)
202666.5 mm (2.6 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Port Allegany by year The longest dry spell of the year at Port Allegany, 1948 to 2026. The record is 22 days in 1987, marked on the chart; the median year is 13 days. 5101520251960198020002020Record: 22 days in 1987
The longest dry spell of the year at Port Allegany, 1948 to 2026. The record is 22 days in 1987, marked on the chart; the median year is 13 days.
Longest dry spell (CDD) at Port Allegany by year
YearLongest dry spell (CDD)
194817 days
194921 days
195014 days
195111 days
196912 days
197016 days
197118 days
197211 days
197315 days
19749 days
197520 days
197613 days
197717 days
197817 days
197911 days
198020 days
198113 days
198211 days
198316 days
198412 days
198513 days
198611 days
198722 days
198817 days
198911 days
199013 days
199113 days
199213 days
199311 days
199414 days
199518 days
199611 days
199711 days
199816 days
199914 days
200011 days
200116 days
200222 days
200313 days
200412 days
200517 days
200617 days
200715 days
200816 days
200912 days
201012 days
201113 days
201210 days
201313 days
201410 days
201511 days
201617 days
201711 days
201811 days
201911 days
202014 days
202116 days
202210 days
202318 days
202414 days
202512 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.

Rainfall Return Levels

58 years, 1949 to 2025

A day with at least 53.1 mm (2.1 in) of rain is expected about once in 2 years. A day with at least 119.1 mm (4.7 in) of rain is expected about once in 100 years.

Rainfall return levels at Port Allegany: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years53.1 mm (2.1 in)
5 years69.2 mm (2.7 in)
10 years80.4 mm (3.2 in)
25 years95.4 mm (3.8 in)
50 years107.0 mm (4.2 in)
100 years119.1 mm (4.7 in)Longer than the 58 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, 58 years of values from 1949 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: 119.4 mm (4.7 in) in 1972; 100.1 mm (3.9 in) in 1994; 95.0 mm (3.7 in) in 2010.

Download the Data

  • Data for Port Allegany standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Port Allegany 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 2026-10-13 (13 October 2026). Records are computed by this site and are not official.

Data as of . Last revised (2026-10-12).