Daily records
Page built 2026-10-19
Data as of 2025-12-31
Search
Built 2026-10-19 (19 October 2026)

Index Threshold Days by Year (USC00453909)

6 fixed thresholds counted per year at Index (USC00453909): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Index Thresholds

  • Index: days with 10 mm (0.39 in) or more of precipitation in 15 years, most in 1953 with 102.
  • Index: days with 25 mm (0.98 in) or more of precipitation in 15 years, most in 1953 with 38.
  • Index: days with 50 mm (1.97 in) or more of precipitation in 14 years, most in 1953 with 11.
  • Index: days with 100 mm (3.94 in) or more of precipitation in 5 years, most in 1937 with 1.
  • 6 fixed thresholds have at least one qualifying day at Index.
15 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Index Days per year at Index with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 102 in 1953. 0501001501930: 631935: 591936: 681937: 771938: 601939: 581942: 791943: 661948: 871950: 721951: 781952: 531953: 1021954: 871955: 8719301936193819421948195119531955
Days per year at Index with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 102 in 1953.
Days with 10 mm (0.39 in) or more of precipitation per year at Index
YearDaysDecade average
19306364.2
19355964.2
19366864.2
19377764.2
19386064.2
19395864.2
19427977.3
19436677.3
19488777.3
19507279.8
19517879.8
19525379.8
195310279.8
19548779.8
19558779.8
First to last qualifying date each year at Index For each year, a bar from the first to the last day at Index meeting 10 mm (0.39 in). 1930: 2 January 1930 to 16 December 19301935: 3 January 1935 to 31 December 19351936: 1 January 1936 to 23 December 19361937: 9 January 1937 to 30 December 19371938: 12 January 1938 to 31 December 19381939: 1 January 1939 to 20 December 19391942: 7 January 1942 to 31 December 19421943: 2 January 1943 to 2 December 19431948: 1 January 1948 to 31 December 19481950: 9 January 1950 to 31 December 19501951: 2 January 1951 to 30 December 19511952: 18 January 1952 to 30 December 19521953: 2 January 1953 to 31 December 19531954: 1 January 1954 to 31 December 19541955: 1 January 1955 to 12 December 195519301936193819421948195119531955JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Index meeting 10 mm (0.39 in).
First to last qualifying date each year at Index
YearFirst dateLast date
19301930-01-021930-12-16
19351935-01-031935-12-31
19361936-01-011936-12-23
19371937-01-091937-12-30
19381938-01-121938-12-31
19391939-01-011939-12-20
19421942-01-071942-12-31
19431943-01-021943-12-02
19481948-01-011948-12-31
19501950-01-091950-12-31
19511951-01-021951-12-30
19521952-01-181952-12-30
19531953-01-021953-12-31
19541954-01-011954-12-31
19551955-01-011955-12-12

Every Fixed Threshold

Fixed thresholds at Index
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain15102195387
25 mm (0.98 in): Days with 25 mm or more rain1538195329
50 mm (1.97 in): Days with 50 mm or more rain1411195310
100 mm (3.94 in): Days with 100 mm or more rain5119371
10 cm (3.9 in): Days with 10 cm or more snowfall4819548
25 cm (9.8 in): Days with 25 cm or more snowfall3219542

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1930.

Download the Data

  • Data for Index 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).