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Built 2026-10-15 (15 October 2026)

Rochester Threshold Days by Year

13 fixed thresholds counted per year at Rochester (ASN00080049): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Rochester Thresholds

  • Rochester: days with 10 mm (0.39 in) or more of precipitation in 116 years, most in 1973 with 31.
  • Rochester: days with 25 mm (0.98 in) or more of precipitation in 99 years, most in 1973 with 10.
  • Rochester: days with 50 mm (1.97 in) or more of precipitation in 26 years, most in 1910 with 2.
  • Rochester: days with a maximum temperature at or above 30 C (86 F) in 10 years, most in 1968 with 73.
  • 13 fixed thresholds have at least one qualifying day at Rochester.
10 years with a qualifying day
Days at or above 30 C (86 F) per year at Rochester Days per year at Rochester with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 73 in 1968. 0204060801965: 681966: 641967: 591968: 731969: 591970: 591971: 651972: 661973: 571974: 571965196619671968196919701971197219731974
Days per year at Rochester with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 73 in 1968.
Days at or above 30 C (86 F) per year at Rochester
YearDaysDecade average
19656864.6
19666464.6
19675964.6
19687364.6
19695964.6
19705960.8
19716560.8
19726660.8
19735760.8
19745760.8
First to last qualifying date each year at Rochester For each year, a bar from the first to the last day at Rochester meeting 30 C (86 F). 1965: 1 January 1965 to 30 December 19651966: 2 January 1966 to 31 December 19661967: 1 January 1967 to 28 December 19671968: 6 January 1968 to 30 December 19681969: 1 January 1969 to 29 December 19691970: 7 January 1970 to 27 December 19701971: 5 January 1971 to 26 December 19711972: 4 January 1972 to 31 December 19721973: 1 January 1973 to 29 December 19731974: 3 January 1974 to 27 December 197419651967196919711973JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Rochester meeting 30 C (86 F).
First to last qualifying date each year at Rochester
YearFirst dateLast date
19651965-01-011965-12-30
19661966-01-021966-12-31
19671967-01-011967-12-28
19681968-01-061968-12-30
19691969-01-011969-12-29
19701970-01-071970-12-27
19711971-01-051971-12-26
19721972-01-041972-12-31
19731973-01-011973-12-29
19741974-01-031974-12-27

Every Fixed Threshold

Fixed thresholds at Rochester
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days1073196857
35 C (95 F): Days102919666
40 C (104 F): Days8519684
45 C (113 F): Days1119681
90 F (32.2 C): Days1052196831
100 F (37.8 C): Days91119657
110 F (43.3 C): Days1119681
0 C (32 F): Frost days (min102219669
20 C (68 F): Tropical nights (min1018196814
25 C (77 F): Days with min2319683
10 mm (0.39 in): Days with 10 mm or more rain11631197315
25 mm (0.98 in): Days with 25 mm or more rain991019733
50 mm (1.97 in): Days with 50 mm or more rain26219101

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1965.

Download the Data

  • Data for Rochester 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 2026-10-14 (14 October 2026). Threshold counts are computed by this site.

Data as of . Last revised (2026-10-14).