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

Grant Dam 38 Threshold Days by Year (USC00153358)

5 fixed thresholds counted per year at Grant Dam 38 (USC00153358): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Grant Dam 38 Thresholds

  • Grant Dam 38: days with 10 mm (0.39 in) or more of precipitation in 33 years, most in 1926 with 45.
  • Grant Dam 38: days with 25 mm (0.98 in) or more of precipitation in 33 years, most in 1955 with 15.
  • Grant Dam 38: days with 50 mm (1.97 in) or more of precipitation in 21 years, most in 1932 with 4.
  • Grant Dam 38: days with 10 cm (3.9 in) or more of snowfall in 7 years, most in 1951 with 2.
  • 5 fixed thresholds have at least one qualifying day at Grant Dam 38.
33 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Grant Dam 38 Days per year at Grant Dam 38 with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 45 in 1926. 02040601925: 281926: 451927: 381929: 371930: 191931: 291932: 341933: 361934: 191935: 331936: 241937: 301938: 331939: 321943: 241944: 321945: 411946: 321947: 341948: 401949: 351950: 431951: 371952: 371953: 231954: 291955: 401956: 321957: 361958: 321959: 341960: 261961: 42192519301934193819451949195319571961
Days per year at Grant Dam 38 with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 45 in 1926.
Days with 10 mm (0.39 in) or more of precipitation per year at Grant Dam 38
YearDaysDecade average
19252837
19264537
19273837
19293737
19301928.9
19312928.9
19323428.9
19333628.9
19341928.9
19353328.9
19362428.9
19373028.9
19383328.9
19393228.9
19432434
19443234
19454134
19463234
19473434
19484034
19493534
19504334.3
19513734.3
19523734.3
19532334.3
19542934.3
19554034.3
19563234.3
19573634.3
19583234.3
19593434.3
19602634
19614234
First to last qualifying date each year at Grant Dam 38 For each year, a bar from the first to the last day at Grant Dam 38 meeting 10 mm (0.39 in). 1925: 20 January 1925 to 27 November 19251926: 9 January 1926 to 26 December 19261927: 19 January 1927 to 14 December 19271929: 1 January 1929 to 19 December 19291930: 3 January 1930 to 6 December 19301931: 6 January 1931 to 22 December 19311932: 6 January 1932 to 31 December 19321933: 19 January 1933 to 20 December 19331934: 5 January 1934 to 26 December 19341935: 17 January 1935 to 9 December 19351936: 6 January 1936 to 31 December 19361937: 10 January 1937 to 28 December 19371938: 31 January 1938 to 27 December 19381939: 5 January 1939 to 26 December 19391943: 1 February 1943 to 29 December 19431944: 3 January 1944 to 26 December 19441945: 1 January 1945 to 25 December 19451946: 9 January 1946 to 29 December 19461947: 2 January 1947 to 8 December 19471948: 1 January 1948 to 29 December 19481949: 4 January 1949 to 27 December 19491950: 3 January 1950 to 7 December 19501951: 2 January 1951 to 26 December 19511952: 3 January 1952 to 10 December 19521953: 8 January 1953 to 6 December 19531954: 21 January 1954 to 29 December 19541955: 5 January 1955 to 23 November 19551956: 19 January 1956 to 21 December 19561957: 10 January 1957 to 26 December 19571958: 14 January 1958 to 19 November 19581959: 1 January 1959 to 28 December 19591960: 13 January 1960 to 21 December 19601961: 1 January 1961 to 17 December 19611925193119361944194919541959JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Grant Dam 38 meeting 10 mm (0.39 in).
First to last qualifying date each year at Grant Dam 38
YearFirst dateLast date
19251925-01-201925-11-27
19261926-01-091926-12-26
19271927-01-191927-12-14
19291929-01-011929-12-19
19301930-01-031930-12-06
19311931-01-061931-12-22
19321932-01-061932-12-31
19331933-01-191933-12-20
19341934-01-051934-12-26
19351935-01-171935-12-09
19361936-01-061936-12-31
19371937-01-101937-12-28
19381938-01-311938-12-27
19391939-01-051939-12-26
19431943-02-011943-12-29
19441944-01-031944-12-26
19451945-01-011945-12-25
19461946-01-091946-12-29
19471947-01-021947-12-08
19481948-01-011948-12-29
19491949-01-041949-12-27
19501950-01-031950-12-07
19511951-01-021951-12-26
19521952-01-031952-12-10
19531953-01-081953-12-06
19541954-01-211954-12-29
19551955-01-051955-11-23
19561956-01-191956-12-21
19571957-01-101957-12-26
19581958-01-141958-11-19
19591959-01-011959-12-28
19601960-01-131960-12-21
19611961-01-011961-12-17

Every Fixed Threshold

Fixed thresholds at Grant Dam 38
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain3345192642
25 mm (0.98 in): Days with 25 mm or more rain331519558
50 mm (1.97 in): Days with 50 mm or more rain21419321
100 mm (3.94 in): Days with 100 mm or more rain2119481
10 cm (3.9 in): Days with 10 cm or more snowfall7219511

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 Grant Dam 38 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).