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Built 2026-10-19 (19 October 2026)

Walpole Threshold Days by Year (USC00278854)

14 fixed thresholds counted per year at Walpole (USC00278854): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Walpole Thresholds

  • Walpole: nights with a minimum temperature at or below 0 C (32 F) in 5 years, most in 1890 with 179.
  • Walpole: nights with a minimum temperature at or below -10 C (14 F) in 5 years, most in 1890 with 72.
  • Walpole: nights with a minimum temperature at or below -20 C (-4 F) in 5 years, most in 1886 with 25.
  • Walpole: days with a maximum temperature at or above 30 C (86 F) in 4 years, most in 1892 with 23.
  • 14 fixed thresholds have at least one qualifying day at Walpole.
4 years with a qualifying day
Days at or above 30 C (86 F) per year at Walpole Days per year at Walpole with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 23 in 1892. 01020301886: 131890: 101891: 101892: 231886189018911892
Days per year at Walpole with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 23 in 1892.
Days at or above 30 C (86 F) per year at Walpole
YearDaysDecade average
18861313
18901014.3
18911014.3
18922314.3
First to last qualifying date each year at Walpole For each year, a bar from the first to the last day at Walpole meeting 30 C (86 F). 1886: 3 July 1886 to 29 August 18861890: 30 June 1890 to 5 August 18901891: 11 June 1891 to 11 August 18911892: 1 June 1892 to 18 August 18921886189018911892JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Walpole meeting 30 C (86 F).
First to last qualifying date each year at Walpole
YearFirst dateLast date
18861886-07-031886-08-29
18901890-06-301890-08-05
18911891-06-111891-08-11
18921892-06-011892-08-18

Every Fixed Threshold

Fixed thresholds at Walpole
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days423189223
35 C (95 F): Days1218862
90 F (32.2 C): Days4518925
0 C (32 F): Ice days (max458188658
0 C (32 F): Frost days (min51791890172
-10 C (14 F): Days with min572189059
-20 C (-4 F): Days with min52518867
-30 C (-22 F): Days with min3318861
20 C (68 F): Tropical nights (min4618926
10 mm (0.39 in): Days with 10 mm or more rain353195153
25 mm (0.98 in): Days with 25 mm or more rain315195115
50 mm (1.97 in): Days with 50 mm or more rain3219501
10 cm (3.9 in): Days with 10 cm or more snowfall3519515
25 cm (9.8 in): Days with 25 cm or more snowfall1119511

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1886.

Download the Data

  • Data for Walpole 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).