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

Harvard Threshold Days by Year (USC00303714)

4 fixed thresholds counted per year at Harvard (USC00303714): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Harvard Thresholds

  • Harvard: days with 10 mm (0.39 in) or more of precipitation in 10 years, most in 1951 with 51.
  • Harvard: days with 25 mm (0.98 in) or more of precipitation in 10 years, most in 1955 with 15.
  • Harvard: days with 50 mm (1.97 in) or more of precipitation in 7 years, most in 1952 with 3.
  • Harvard: days with 100 mm (3.94 in) or more of precipitation in 1 years, most in 1952 with 1.
  • 4 fixed thresholds have at least one qualifying day at Harvard.
10 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Harvard Days per year at Harvard with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 51 in 1951. 02040601949: 411950: 411951: 511952: 401953: 391954: 341955: 421956: 461957: 341958: 381949195019511952195319541955195619571958
Days per year at Harvard with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 51 in 1951.
Days with 10 mm (0.39 in) or more of precipitation per year at Harvard
YearDaysDecade average
19494141
19504140.6
19515140.6
19524040.6
19533940.6
19543440.6
19554240.6
19564640.6
19573440.6
19583840.6
First to last qualifying date each year at Harvard For each year, a bar from the first to the last day at Harvard meeting 10 mm (0.39 in). 1949: 1 January 1949 to 13 December 19491950: 6 January 1950 to 5 December 19501951: 4 January 1951 to 31 December 19511952: 3 January 1952 to 22 December 19521953: 9 January 1953 to 15 December 19531954: 27 January 1954 to 30 December 19541955: 3 January 1955 to 15 December 19551956: 3 February 1956 to 23 December 19561957: 1 January 1957 to 27 December 19571958: 15 January 1958 to 6 December 195819491951195319551957JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Harvard meeting 10 mm (0.39 in).
First to last qualifying date each year at Harvard
YearFirst dateLast date
19491949-01-011949-12-13
19501950-01-061950-12-05
19511951-01-041951-12-31
19521952-01-031952-12-22
19531953-01-091953-12-15
19541954-01-271954-12-30
19551955-01-031955-12-15
19561956-02-031956-12-23
19571957-01-011957-12-27
19581958-01-151958-12-06

Every Fixed Threshold

Fixed thresholds at Harvard
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain1051195138
25 mm (0.98 in): Days with 25 mm or more rain101519559
50 mm (1.97 in): Days with 50 mm or more rain7319521
100 mm (3.94 in): Days with 100 mm or more rain1119521

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1949.

Download the Data

  • Data for Harvard 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).