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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 (USC00203652)

10 fixed thresholds counted per year at Hartford (USC00203652): 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 1 years, most in 1925 with 69.
  • Hartford: days with a maximum temperature at or above 35 C (95 F) in 1 years, most in 1925 with 11.
  • Hartford: days with a maximum temperature at or above 90 F (32.2 C) in 1 years, most in 1925 with 40.
  • Hartford: days with a maximum temperature at or below 0 C (32 F) in 1 years, most in 1925 with 37.
  • 10 fixed thresholds have at least one qualifying day at Hartford.
1 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 69 in 1925. 0204060801925: 691925
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 69 in 1925.
Days at or above 30 C (86 F) per year at Hartford
YearDaysDecade average
19256969
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). 1925: 23 April 1925 to 20 September 19251925JanFebMarAprMayJunJulAugSepOctNovDec
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
19251925-04-231925-09-20

Every Fixed Threshold

Fixed thresholds at Hartford
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days169192569
35 C (95 F): Days111192511
90 F (32.2 C): Days140192540
0 C (32 F): Ice days (max137192537
0 C (32 F): Frost days (min11711925171
-10 C (14 F): Days with min146192546
-20 C (-4 F): Days with min1419254
20 C (68 F): Tropical nights (min1719257
10 mm (0.39 in): Days with 10 mm or more rain130192530
25 mm (0.98 in): Days with 25 mm or more rain1319253

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1925.

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).