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Data as of 2026-10-16
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Built 2026-10-18 (18 October 2026)

Prompton Dam Threshold Days by Year

14 fixed thresholds counted per year at Prompton Dam (USC00367186): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Prompton Dam Thresholds

  • Prompton Dam: days with 10 mm (0.39 in) or more of precipitation in 7 years, most in 2010 with 36.
  • Prompton Dam: days with 25 mm (0.98 in) or more of precipitation in 7 years, most in 2010 with 8.
  • Prompton Dam: days with 50 mm (1.97 in) or more of precipitation in 6 years, most in 2010 with 2.
  • Prompton Dam: days with a maximum temperature at or above 30 C (86 F) in 2 years, most in 2011 with 13.
  • 14 fixed thresholds have at least one qualifying day at Prompton Dam.
7 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Prompton Dam Days per year at Prompton Dam with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 36 in 2010. 02040601971: 361972: 491973: 501974: 331975: 372010: 362026: 161971197219731974197520102026
Days per year at Prompton Dam with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 36 in 2010.
Days with 10 mm (0.39 in) or more of precipitation per year at Prompton Dam
YearDaysDecade average
19713641
19724941
19735041
19743341
19753741
20103636
20261616
First to last qualifying date each year at Prompton Dam For each year, a bar from the first to the last day at Prompton Dam meeting 10 mm (0.39 in). 1971: 4 January 1971 to 30 December 19711972: 3 January 1972 to 22 December 19721973: 1 January 1973 to 27 December 19731974: 11 January 1974 to 26 December 19741975: 2 January 1975 to 28 November 19752010: 26 January 2010 to 13 December 20102026: 11 February 2026 to 28 September 20261971197219731974197520102026JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Prompton Dam meeting 10 mm (0.39 in).
First to last qualifying date each year at Prompton Dam
YearFirst dateLast date
19711971-01-041971-12-30
19721972-01-031972-12-22
19731973-01-011973-12-27
19741974-01-111974-12-26
19751975-01-021975-11-28
20102010-01-262010-12-13
20262026-02-112026-09-28

Every Fixed Threshold

Fixed thresholds at Prompton Dam
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days21320119
35 C (95 F): Days10n/a2
90 F (32.2 C): Days2620115
0 C (32 F): Ice days (max246201123
0 C (32 F): Frost days (min2144201156
-10 C (14 F): Days with min239201118
-20 C (-4 F): Days with min2720113
20 C (68 F): Tropical nights (min2320117
10 mm (0.39 in): Days with 10 mm or more rain736201016
25 mm (0.98 in): Days with 25 mm or more rain7820103
50 mm (1.97 in): Days with 50 mm or more rain6220102
100 mm (3.94 in): Days with 100 mm or more rain2120101
10 cm (3.9 in): Days with 10 cm or more snowfall2420102
25 cm (9.8 in): Days with 25 cm or more snowfall2120101

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 2011.

Download the Data

  • Data for Prompton Dam 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 2026-10-16 (16 October 2026). Threshold counts are computed by this site.

Data as of . Last revised (2026-10-16).