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Data as of 2026-10-17
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Built 2026-10-19 (19 October 2026)

Williamsport Threshold Days by Year (USC00189570)

15 fixed thresholds counted per year at Williamsport (USC00189570): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Williamsport Thresholds

  • Williamsport: days with 10 mm (0.39 in) or more of precipitation in 46 years, most in 2018 with 58.
  • Williamsport: days with 25 mm (0.98 in) or more of precipitation in 46 years, most in 2018 with 22.
  • Williamsport: days with 50 mm (1.97 in) or more of precipitation in 35 years, most in 2018 with 5.
  • Williamsport: days with 10 cm (3.9 in) or more of snowfall in 26 years, most in 1960 with 6.
  • 15 fixed thresholds have at least one qualifying day at Williamsport.
7 years with a qualifying day
Days at or above 30 C (86 F) per year at Williamsport Days per year at Williamsport with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 84 in 2010. 02550751002005: 772006: 622008: 402009: 362010: 842011: 572013: 422005200620082009201020112013
Days per year at Williamsport with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 84 in 2010.
Days at or above 30 C (86 F) per year at Williamsport
YearDaysDecade average
20057753.8
20066253.8
20084053.8
20093653.8
20108461
20115761
20134261
First to last qualifying date each year at Williamsport For each year, a bar from the first to the last day at Williamsport meeting 30 C (86 F). 2005: 12 May 2005 to 24 September 20052006: 29 May 2006 to 20 September 20062008: 6 June 2008 to 15 September 20082009: 26 April 2009 to 24 September 20092010: 7 April 2010 to 26 September 20102011: 26 April 2011 to 15 September 20112013: 22 May 2013 to 7 October 20132005200620082009201020112013JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Williamsport meeting 30 C (86 F).
First to last qualifying date each year at Williamsport
YearFirst dateLast date
20052005-05-122005-09-24
20062006-05-292006-09-20
20082008-06-062008-09-15
20092009-04-262009-09-24
20102010-04-072010-09-26
20112011-04-262011-09-15
20132013-05-222013-10-07

Every Fixed Threshold

Fixed thresholds at Williamsport
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days784201042
35 C (95 F): Days62520103
90 F (32.2 C): Days752201018
100 F (37.8 C): Days2320102
0 C (32 F): Ice days (max720201014
0 C (32 F): Frost days (min61182011110
-10 C (14 F): Days with min61620114
20 C (68 F): Tropical nights (min628201125
25 C (77 F): Days with min1120101
10 mm (0.39 in): Days with 10 mm or more rain4658201823
25 mm (0.98 in): Days with 25 mm or more rain462220187
50 mm (1.97 in): Days with 50 mm or more rain35520181
100 mm (3.94 in): Days with 100 mm or more rain4119531
10 cm (3.9 in): Days with 10 cm or more snowfall26619602
25 cm (9.8 in): Days with 25 cm or more snowfall12319612

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 2005.

Download the Data

  • Data for Williamsport 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 (2026-10-17).