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

Hartford Threshold Days by Year (USC00063446)

12 fixed thresholds counted per year at Hartford (USC00063446): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Hartford Thresholds

  • Hartford: days with a maximum temperature at or above 30 C (86 F) in 10 years, most in 1896 with 23.
  • Hartford: days with a maximum temperature at or above 90 F (32.2 C) in 10 years, most in 1900 with 13.
  • Hartford: days with a maximum temperature at or below 0 C (32 F) in 10 years, most in 1904 with 54.
  • Hartford: nights with a minimum temperature at or below 0 C (32 F) in 9 years, most in 1899 with 121.
  • 12 fixed thresholds have at least one qualifying day at Hartford.
10 years with a qualifying day
Days at or above 30 C (86 F) per year at Hartford Days per year at Hartford with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 23 in 1896. 01020301894: 191895: 121896: 231897: 71898: 231899: 131900: 221901: 191902: 41904: 41894189518961897189818991900190119021904
Days per year at Hartford with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 23 in 1896.
Days at or above 30 C (86 F) per year at Hartford
YearDaysDecade average
18941916.2
18951216.2
18962316.2
1897716.2
18982316.2
18991316.2
19002212.3
19011912.3
1902412.3
1904412.3
First to last qualifying date each year at Hartford For each year, a bar from the first to the last day at Hartford meeting 30 C (86 F). 1894: 11 June 1894 to 10 September 18941895: 9 May 1895 to 23 September 18951896: 16 April 1896 to 13 August 18961897: 25 June 1897 to 11 September 18971898: 9 June 1898 to 4 September 18981899: 5 June 1899 to 21 August 18991900: 14 May 1900 to 12 September 19001901: 25 June 1901 to 30 July 19011902: 23 May 1902 to 14 July 19021904: 25 June 1904 to 19 July 190418941896189819001902JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Hartford meeting 30 C (86 F).
First to last qualifying date each year at Hartford
YearFirst dateLast date
18941894-06-111894-09-10
18951895-05-091895-09-23
18961896-04-161896-08-13
18971897-06-251897-09-11
18981898-06-091898-09-04
18991899-06-051899-08-21
19001900-05-141900-09-12
19011901-06-251901-07-30
19021902-05-231902-07-14
19041904-06-251904-07-19

Every Fixed Threshold

Fixed thresholds at Hartford
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days102318964
35 C (95 F): Days4218982
90 F (32.2 C): Days101319002
0 C (32 F): Ice days (max1054190454
0 C (32 F): Frost days (min91211899107
-10 C (14 F): Days with min934190130
-20 C (-4 F): Days with min7418961
20 C (68 F): Tropical nights (min92718965
10 mm (0.39 in): Days with 10 mm or more rain952190231
25 mm (0.98 in): Days with 25 mm or more rain92519016
50 mm (1.97 in): Days with 50 mm or more rain8719021
100 mm (3.94 in): Days with 100 mm or more rain10n/a1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1894.

Download the Data

  • Data for Hartford 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).