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

Plymouth Threshold Days by Year (USC00426938)

14 fixed thresholds counted per year at Plymouth (USC00426938): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Plymouth Thresholds

  • Plymouth: days with 10 mm (0.39 in) or more of precipitation in 40 years, most in 2005 with 21.
  • Plymouth: days with 25 mm (0.98 in) or more of precipitation in 31 years, most in 2005 with 7.
  • Plymouth: days with 10 cm (3.9 in) or more of snowfall in 9 years, most in 1942 with 3.
  • Plymouth: days with a maximum temperature at or above 30 C (86 F) in 3 years, most in 1943 with 80.
  • 14 fixed thresholds have at least one qualifying day at Plymouth.
3 years with a qualifying day
Days at or above 30 C (86 F) per year at Plymouth Days per year at Plymouth with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 80 in 1943. 0204060801941: 501942: 751943: 80194119421943
Days per year at Plymouth with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 80 in 1943.
Days at or above 30 C (86 F) per year at Plymouth
YearDaysDecade average
19415068.3
19427568.3
19438068.3
First to last qualifying date each year at Plymouth For each year, a bar from the first to the last day at Plymouth meeting 30 C (86 F). 1941: 11 May 1941 to 18 September 19411942: 22 May 1942 to 1 October 19421943: 30 April 1943 to 7 October 1943194119421943JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Plymouth meeting 30 C (86 F).
First to last qualifying date each year at Plymouth
YearFirst dateLast date
19411941-05-111941-09-18
19421942-05-221942-10-01
19431943-04-301943-10-07

Every Fixed Threshold

Fixed thresholds at Plymouth
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days380194380
35 C (95 F): Days318194218
90 F (32.2 C): Days350194350
100 F (37.8 C): Days2319433
0 C (32 F): Ice days (max347194221
0 C (32 F): Frost days (min21931942174
-10 C (14 F): Days with min284194242
-20 C (-4 F): Days with min22119424
-30 C (-22 F): Days with min1419424
20 C (68 F): Tropical nights (min1219422
10 mm (0.39 in): Days with 10 mm or more rain402120057
25 mm (0.98 in): Days with 25 mm or more rain31720051
50 mm (1.97 in): Days with 50 mm or more rain1119881
10 cm (3.9 in): Days with 10 cm or more snowfall9319422

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1941.

Download the Data

  • Data for Plymouth 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).