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Built 2026-10-19 (19 October 2026)

Potomac Fltr Plt Threshold Days by Year (USC00187272)

7 fixed thresholds counted per year at Potomac Fltr Plt (USC00187272): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Potomac Fltr Plt Thresholds

  • Potomac Fltr Plt: days with 10 mm (0.39 in) or more of precipitation in 41 years, most in 2003 with 54.
  • Potomac Fltr Plt: days with 25 mm (0.98 in) or more of precipitation in 41 years, most in 2003 with 23.
  • Potomac Fltr Plt: days with 50 mm (1.97 in) or more of precipitation in 36 years, most in 2005 with 7.
  • Potomac Fltr Plt: days with 10 cm (3.9 in) or more of snowfall in 11 years, most in 1964 with 4.
  • 7 fixed thresholds have at least one qualifying day at Potomac Fltr Plt.
41 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Potomac Fltr Plt Days per year at Potomac Fltr Plt with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 54 in 2003. 02040601963: 251964: 291965: 231966: 301967: 231968: 321969: 261971: 351972: 361973: 371974: 271975: 381976: 381978: 331979: 451980: 281981: 281982: 271983: 341984: 271986: 321987: 311988: 341989: 341991: 261992: 341993: 341994: 361995: 251996: 501998: 371999: 402000: 322001: 352002: 372003: 542004: 352005: 312007: 212009: 442010: 26196319681974198019861992199820032010
Days per year at Potomac Fltr Plt with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 54 in 2003.
Days with 10 mm (0.39 in) or more of precipitation per year at Potomac Fltr Plt
YearDaysDecade average
19632526.9
19642926.9
19652326.9
19663026.9
19672326.9
19683226.9
19692626.9
19713536.1
19723636.1
19733736.1
19742736.1
19753836.1
19763836.1
19783336.1
19794536.1
19802830.6
19812830.6
19822730.6
19833430.6
19842730.6
19863230.6
19873130.6
19883430.6
19893430.6
19912635.3
19923435.3
19933435.3
19943635.3
19952535.3
19965035.3
19983735.3
19994035.3
20003236.1
20013536.1
20023736.1
20035436.1
20043536.1
20053136.1
20072136.1
20094436.1
20102626
First to last qualifying date each year at Potomac Fltr Plt For each year, a bar from the first to the last day at Potomac Fltr Plt meeting 10 mm (0.39 in). 1963: 12 January 1963 to 24 December 19631964: 2 January 1964 to 20 December 19641965: 10 January 1965 to 8 October 19651966: 6 January 1966 to 29 December 19661967: 28 January 1967 to 29 December 19671968: 14 January 1968 to 23 December 19681969: 19 January 1969 to 26 December 19691971: 1 January 1971 to 8 December 19711972: 2 January 1972 to 31 December 19721973: 22 January 1973 to 26 December 19731974: 3 January 1974 to 16 December 19741975: 19 January 1975 to 31 December 19751976: 1 January 1976 to 20 December 19761978: 8 January 1978 to 24 December 19781979: 1 January 1979 to 13 December 19791980: 11 January 1980 to 24 November 19801981: 2 February 1981 to 15 December 19811982: 4 January 1982 to 16 December 19821983: 10 January 1983 to 28 December 19831984: 10 January 1984 to 5 December 19841986: 19 January 1986 to 24 December 19861987: 1 January 1987 to 15 December 19871988: 20 January 1988 to 27 November 19881989: 6 January 1989 to 8 December 19891991: 7 January 1991 to 29 December 19911992: 4 January 1992 to 11 December 19921993: 5 January 1993 to 21 December 19931994: 4 January 1994 to 10 December 19941995: 6 January 1995 to 19 December 19951996: 2 January 1996 to 13 December 19961998: 15 January 1998 to 8 December 19981999: 3 January 1999 to 14 December 19992000: 4 January 2000 to 17 December 20002001: 19 January 2001 to 11 December 20012002: 6 January 2002 to 26 December 20022003: 1 January 2003 to 24 December 20032004: 3 February 2004 to 23 December 20042005: 14 February 2005 to 25 December 20052007: 1 January 2007 to 16 December 20072009: 7 January 2009 to 9 December 20092010: 17 January 2010 to 12 December 20101963196919761983199119982004JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Potomac Fltr Plt meeting 10 mm (0.39 in).
First to last qualifying date each year at Potomac Fltr Plt
YearFirst dateLast date
19631963-01-121963-12-24
19641964-01-021964-12-20
19651965-01-101965-10-08
19661966-01-061966-12-29
19671967-01-281967-12-29
19681968-01-141968-12-23
19691969-01-191969-12-26
19711971-01-011971-12-08
19721972-01-021972-12-31
19731973-01-221973-12-26
19741974-01-031974-12-16
19751975-01-191975-12-31
19761976-01-011976-12-20
19781978-01-081978-12-24
19791979-01-011979-12-13
19801980-01-111980-11-24
19811981-02-021981-12-15
19821982-01-041982-12-16
19831983-01-101983-12-28
19841984-01-101984-12-05
19861986-01-191986-12-24
19871987-01-011987-12-15
19881988-01-201988-11-27
19891989-01-061989-12-08
19911991-01-071991-12-29
19921992-01-041992-12-11
19931993-01-051993-12-21
19941994-01-041994-12-10
19951995-01-061995-12-19
19961996-01-021996-12-13
19981998-01-151998-12-08
19991999-01-031999-12-14
20002000-01-042000-12-17
20012001-01-192001-12-11
20022002-01-062002-12-26
20032003-01-012003-12-24
20042004-02-032004-12-23
20052005-02-142005-12-25
20072007-01-012007-12-16
20092009-01-072009-12-09
20102010-01-172010-12-12

Every Fixed Threshold

Fixed thresholds at Potomac Fltr Plt
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain4154200326
25 mm (0.98 in): Days with 25 mm or more rain412320035
50 mm (1.97 in): Days with 50 mm or more rain36720052
100 mm (3.94 in): Days with 100 mm or more rain5119661
200 mm (7.87 in): Days with 200 mm or more rain10n/a1
10 cm (3.9 in): Days with 10 cm or more snowfall11419642
25 cm (9.8 in): Days with 25 cm or more snowfall3119831

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1963.

Download the Data

  • Data for Potomac Fltr Plt threshold days by year: CSV or JSON. Field meanings are on the data page.

Source: NOAA National Centers for Environmental Information, Global Historical Climatology Network Daily (GHCN-Daily). Records are computed by World Extreme Weather Monitor and are not official NOAA products. (US Government open data (NOAA NCEI)) Data as of 2026-10-17 (17 October 2026). Threshold counts are computed by this site.

Data as of . Last revised (2025-12-31).