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Data as of 2025-12-31
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Built 2026-10-19 (19 October 2026)

Dorchester Threshold Days by Year (CA008101230)

12 fixed thresholds counted per year at Dorchester (CA008101230): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Dorchester Thresholds

  • Dorchester: days with 10 cm (3.9 in) or more of snowfall in 23 years, most in 1872 with 15.
  • Dorchester: days with 10 mm (0.39 in) or more of precipitation in 22 years, most in 1884 with 55.
  • Dorchester: days with 25 mm (0.98 in) or more of precipitation in 22 years, most in 1872 with 21.
  • Dorchester: days with 25 cm (9.8 in) or more of snowfall in 17 years, most in 1874 with 5.
  • 12 fixed thresholds have at least one qualifying day at Dorchester.
6 years with a qualifying day
Nights at or below 0 C (32 F) per year at Dorchester Days per year at Dorchester with nights with a minimum temperature at or below 0 C (32 F), with the decade average as a line. The most was 216 in 1892. 01002003001879: 1711888: 1871889: 1691890: 1861891: 1871892: 216187918881889189018911892
Days per year at Dorchester with nights with a minimum temperature at or below 0 C (32 F), with the decade average as a line. The most was 216 in 1892.
Nights at or below 0 C (32 F) per year at Dorchester
YearDaysDecade average
1879171171
1888187178
1889169178
1890186196.3
1891187196.3
1892216196.3
First to last qualifying date each year at Dorchester For each year, a bar from the first to the last day at Dorchester meeting 0 C (32 F). 1879: 1 January 1879 to 31 December 18791888: 1 January 1888 to 31 December 18881889: 1 January 1889 to 31 December 18891890: 1 January 1890 to 31 December 18901891: 1 January 1891 to 31 December 18911892: 1 January 1892 to 31 December 1892187918881889189018911892JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Dorchester meeting 0 C (32 F).
First to last qualifying date each year at Dorchester
YearFirst dateLast date
18791879-01-011879-12-31
18881888-01-011888-12-31
18891889-01-011889-12-31
18901890-01-011890-12-31
18911891-01-011891-12-31
18921892-01-011892-12-31

Every Fixed Threshold

Fixed thresholds at Dorchester
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
0 C (32 F): Ice days (max61071892107
0 C (32 F): Frost days (min62161892216
-10 C (14 F): Days with min684189062
-20 C (-4 F): Days with min625188810
-30 C (-22 F): Days with min2118791
10 mm (0.39 in): Days with 10 mm or more rain2255188434
25 mm (0.98 in): Days with 25 mm or more rain222118728
50 mm (1.97 in): Days with 50 mm or more rain16418841
100 mm (3.94 in): Days with 100 mm or more rain1118901
10 cm (3.9 in): Days with 10 cm or more snowfall231518725
25 cm (9.8 in): Days with 25 cm or more snowfall17518741
50 cm (19.7 in): Days with 50 cm or more snowfall4118751

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1879.

Download the Data

  • Data for Dorchester 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).