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Data as of 2025-12-31
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Built 2026-10-17 (17 October 2026)

Pottstown Threshold Days by Year

15 fixed thresholds counted per year at Pottstown (USC00367149): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Pottstown Thresholds

  • Pottstown: days with 10 mm (0.39 in) or more of precipitation in 34 years, most in 1948 with 54.
  • Pottstown: days with 25 mm (0.98 in) or more of precipitation in 34 years, most in 1897 with 19.
  • Pottstown: days with 50 mm (1.97 in) or more of precipitation in 23 years, most in 1897 with 4.
  • Pottstown: days with 10 cm (3.9 in) or more of snowfall in 15 years, most in 1948 with 5.
  • 15 fixed thresholds have at least one qualifying day at Pottstown.
5 years with a qualifying day
Days at or above 30 C (86 F) per year at Pottstown Days per year at Pottstown with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 61 in 1895. 0204060801894: 551895: 611896: 511897: 421901: 4518941895189618971901
Days per year at Pottstown with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 61 in 1895.
Days at or above 30 C (86 F) per year at Pottstown
YearDaysDecade average
18945552.3
18956152.3
18965152.3
18974252.3
19014545
First to last qualifying date each year at Pottstown For each year, a bar from the first to the last day at Pottstown meeting 30 C (86 F). 1894: 2 May 1894 to 16 September 18941895: 25 April 1895 to 26 September 18951896: 16 April 1896 to 19 September 18961897: 25 April 1897 to 16 October 18971901: 24 June 1901 to 16 September 190118941895189618971901JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Pottstown meeting 30 C (86 F).
First to last qualifying date each year at Pottstown
YearFirst dateLast date
18941894-05-021894-09-16
18951895-04-251895-09-26
18961896-04-161896-09-19
18971897-04-251897-10-16
19011901-06-241901-09-16

Every Fixed Threshold

Fixed thresholds at Pottstown
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days561189545
35 C (95 F): Days51118955
90 F (32.2 C): Days532189514
100 F (37.8 C): Days1119011
0 C (32 F): Ice days (max531190131
0 C (32 F): Frost days (min5114189685
-10 C (14 F): Days with min521189510
20 C (68 F): Tropical nights (min573190173
25 C (77 F): Days with min2719017
10 mm (0.39 in): Days with 10 mm or more rain3454194835
25 mm (0.98 in): Days with 25 mm or more rain3419189710
50 mm (1.97 in): Days with 50 mm or more rain23418973
100 mm (3.94 in): Days with 100 mm or more rain1119551
10 cm (3.9 in): Days with 10 cm or more snowfall15519482
25 cm (9.8 in): Days with 25 cm or more snowfall2119281

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1894.

Download the Data

  • Data for Pottstown 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 2026-10-15 (15 October 2026). Threshold counts are computed by this site.

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