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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 (CA006142066)

5 fixed thresholds counted per year at Dorchester (CA006142066): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Dorchester Thresholds

  • Dorchester: days with 10 mm (0.39 in) or more of precipitation in 7 years, most in 1979 with 40.
  • Dorchester: days with 25 mm (0.98 in) or more of precipitation in 7 years, most in 1979 with 10.
  • Dorchester: days with 10 cm (3.9 in) or more of snowfall in 7 years, most in 1977 with 4.
  • Dorchester: days with 50 mm (1.97 in) or more of precipitation in 4 years, most in 1980 with 2.
  • 5 fixed thresholds have at least one qualifying day at Dorchester.
7 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Dorchester Days per year at Dorchester with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 40 in 1979. 0102030401977: 321978: 351979: 401980: 331981: 331982: 401983: 401977197819791980198119821983
Days per year at Dorchester with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 40 in 1979.
Days with 10 mm (0.39 in) or more of precipitation per year at Dorchester
YearDaysDecade average
19773235.7
19783535.7
19794035.7
19803336.5
19813336.5
19824036.5
19834036.5
First to last qualifying date each year at Dorchester For each year, a bar from the first to the last day at Dorchester meeting 10 mm (0.39 in). 1977: 24 February 1977 to 13 December 19771978: 8 January 1978 to 31 December 19781979: 13 January 1979 to 25 December 19791980: 10 January 1980 to 8 December 19801981: 1 February 1981 to 22 December 19811982: 22 January 1982 to 27 December 19821983: 10 January 1983 to 28 December 19831977197819791980198119821983JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Dorchester meeting 10 mm (0.39 in).
First to last qualifying date each year at Dorchester
YearFirst dateLast date
19771977-02-241977-12-13
19781978-01-081978-12-31
19791979-01-131979-12-25
19801980-01-101980-12-08
19811981-02-011981-12-22
19821982-01-221982-12-27
19831983-01-101983-12-28

Every Fixed Threshold

Fixed thresholds at Dorchester
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain740197940
25 mm (0.98 in): Days with 25 mm or more rain71019797
50 mm (1.97 in): Days with 50 mm or more rain4219802
10 cm (3.9 in): Days with 10 cm or more snowfall7419772
25 cm (9.8 in): Days with 25 cm or more snowfall2119771

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1977.

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).