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

Harriman Threshold Days by Year (USC00403907)

14 fixed thresholds counted per year at Harriman (USC00403907): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Harriman Thresholds

  • Harriman: days with 10 mm (0.39 in) or more of precipitation in 22 years, most in 1950 with 58.
  • Harriman: days with 25 mm (0.98 in) or more of precipitation in 22 years, most in 1957 with 26.
  • Harriman: days with 50 mm (1.97 in) or more of precipitation in 22 years, most in 1897 with 5.
  • Harriman: days with a maximum temperature at or above 30 C (86 F) in 10 years, most in 1911 with 138.
  • 14 fixed thresholds have at least one qualifying day at Harriman.
10 years with a qualifying day
Days at or above 30 C (86 F) per year at Harriman Days per year at Harriman with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 138 in 1911. 0501001501897: 671898: 981899: 911900: 861901: 651905: 511908: 1111909: 921910: 971911: 1381897189818991900190119051908190919101911
Days per year at Harriman with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 138 in 1911.
Days at or above 30 C (86 F) per year at Harriman
YearDaysDecade average
18976785.3
18989885.3
18999185.3
19008681
19016581
19055181
190811181
19099281
191097117.5
1911138117.5
First to last qualifying date each year at Harriman For each year, a bar from the first to the last day at Harriman meeting 30 C (86 F). 1897: 8 May 1897 to 2 October 18971898: 1 May 1898 to 2 October 18981899: 30 April 1899 to 12 September 18991900: 7 May 1900 to 6 October 19001901: 30 April 1901 to 9 September 19011905: 4 May 1905 to 27 September 19051908: 18 March 1908 to 26 September 19081909: 17 April 1909 to 22 September 19091910: 25 March 1910 to 5 October 19101911: 8 May 1911 to 7 October 191118971899190119081910JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Harriman meeting 30 C (86 F).
First to last qualifying date each year at Harriman
YearFirst dateLast date
18971897-05-081897-10-02
18981898-05-011898-10-02
18991899-04-301899-09-12
19001900-05-071900-10-06
19011901-04-301901-09-09
19051905-05-041905-09-27
19081908-03-181908-09-26
19091909-04-171909-09-22
19101910-03-251910-10-05
19111911-05-081911-10-07

Every Fixed Threshold

Fixed thresholds at Harriman
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days101381911138
35 C (95 F): Days842191142
90 F (32.2 C): Days101101911110
100 F (37.8 C): Days2319113
0 C (32 F): Ice days (max101318992
0 C (32 F): Frost days (min10105190159
-10 C (14 F): Days with min101218992
-20 C (-4 F): Days with min2218992
20 C (68 F): Tropical nights (min1059189844
25 C (77 F): Days with min1118991
10 mm (0.39 in): Days with 10 mm or more rain2258195042
25 mm (0.98 in): Days with 25 mm or more rain2226195714
50 mm (1.97 in): Days with 50 mm or more rain22518973
100 mm (3.94 in): Days with 100 mm or more rain5319113

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1897.

Download the Data

  • Data for Harriman 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).