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Built 2026-10-19 (19 October 2026)

Rock Island 2 NW Threshold Days by Year (USC00407811)

4 fixed thresholds counted per year at Rock Island 2 NW (USC00407811): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Rock Island 2 NW Thresholds

  • Rock Island 2 NW: days with 10 mm (0.39 in) or more of precipitation in 40 years, most in 1951 with 57.
  • Rock Island 2 NW: days with 25 mm (0.98 in) or more of precipitation in 40 years, most in 1905 with 28.
  • Rock Island 2 NW: days with 50 mm (1.97 in) or more of precipitation in 38 years, most in 1912 with 7.
  • Rock Island 2 NW: days with 100 mm (3.94 in) or more of precipitation in 6 years, most in 1929 with 2.
  • 4 fixed thresholds have at least one qualifying day at Rock Island 2 NW.
40 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Rock Island 2 NW Days per year at Rock Island 2 NW with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 57 in 1951. 02040601905: 431906: 441907: 421908: 401909: 511910: 511911: 521912: 481913: 351914: 431915: 531918: 431925: 381927: 431928: 421929: 511930: 321931: 321932: 481933: 381934: 351935: 351936: 391937: 441938: 521939: 521940: 321949: 471950: 551951: 571952: 371953: 451954: 381955: 471956: 401957: 501958: 371959: 491960: 411961: 441905190919131925193019341938195019541958
Days per year at Rock Island 2 NW with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 57 in 1951.
Days with 10 mm (0.39 in) or more of precipitation per year at Rock Island 2 NW
YearDaysDecade average
19054344
19064444
19074244
19084044
19095144
19105146.4
19115246.4
19124846.4
19133546.4
19144346.4
19155346.4
19184346.4
19253843.5
19274343.5
19284243.5
19295143.5
19303240.7
19313240.7
19324840.7
19333840.7
19343540.7
19353540.7
19363940.7
19374440.7
19385240.7
19395240.7
19403239.5
19494739.5
19505545.5
19515745.5
19523745.5
19534545.5
19543845.5
19554745.5
19564045.5
19575045.5
19583745.5
19594945.5
19604142.5
19614442.5
First to last qualifying date each year at Rock Island 2 NW For each year, a bar from the first to the last day at Rock Island 2 NW meeting 10 mm (0.39 in). 1905: 12 January 1905 to 23 December 19051906: 3 January 1906 to 31 December 19061907: 4 January 1907 to 30 December 19071908: 5 January 1908 to 29 December 19081909: 5 January 1909 to 25 December 19091910: 6 January 1910 to 30 December 19101911: 1 January 1911 to 31 December 19111912: 9 January 1912 to 30 December 19121913: 3 January 1913 to 8 November 19131914: 2 January 1914 to 29 December 19141915: 6 January 1915 to 29 December 19151918: 11 January 1918 to 22 December 19181925: 2 January 1925 to 15 December 19251927: 21 January 1927 to 30 December 19271928: 8 January 1928 to 17 December 19281929: 5 January 1929 to 27 December 19291930: 2 January 1930 to 26 December 19301931: 5 January 1931 to 24 December 19311932: 23 January 1932 to 30 December 19321933: 8 January 1933 to 18 December 19331934: 6 January 1934 to 31 December 19341935: 8 January 1935 to 22 December 19351936: 2 January 1936 to 30 December 19361937: 1 January 1937 to 27 December 19371938: 6 January 1938 to 26 December 19381939: 12 January 1939 to 27 December 19391940: 14 January 1940 to 12 November 19401949: 4 January 1949 to 23 December 19491950: 3 January 1950 to 4 December 19501951: 4 January 1951 to 26 December 19511952: 10 January 1952 to 31 December 19521953: 3 January 1953 to 14 December 19531954: 10 January 1954 to 30 December 19541955: 19 January 1955 to 18 December 19551956: 24 January 1956 to 22 December 19561957: 5 January 1957 to 26 December 19571958: 14 January 1958 to 28 December 19581959: 8 January 1959 to 28 December 19591960: 3 January 1960 to 30 December 19601961: 1 January 1961 to 28 December 196119051910191519291934193919521957JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Rock Island 2 NW meeting 10 mm (0.39 in).
First to last qualifying date each year at Rock Island 2 NW
YearFirst dateLast date
19051905-01-121905-12-23
19061906-01-031906-12-31
19071907-01-041907-12-30
19081908-01-051908-12-29
19091909-01-051909-12-25
19101910-01-061910-12-30
19111911-01-011911-12-31
19121912-01-091912-12-30
19131913-01-031913-11-08
19141914-01-021914-12-29
19151915-01-061915-12-29
19181918-01-111918-12-22
19251925-01-021925-12-15
19271927-01-211927-12-30
19281928-01-081928-12-17
19291929-01-051929-12-27
19301930-01-021930-12-26
19311931-01-051931-12-24
19321932-01-231932-12-30
19331933-01-081933-12-18
19341934-01-061934-12-31
19351935-01-081935-12-22
19361936-01-021936-12-30
19371937-01-011937-12-27
19381938-01-061938-12-26
19391939-01-121939-12-27
19401940-01-141940-11-12
19491949-01-041949-12-23
19501950-01-031950-12-04
19511951-01-041951-12-26
19521952-01-101952-12-31
19531953-01-031953-12-14
19541954-01-101954-12-30
19551955-01-191955-12-18
19561956-01-241956-12-22
19571957-01-051957-12-26
19581958-01-141958-12-28
19591959-01-081959-12-28
19601960-01-031960-12-30
19611961-01-011961-12-28

Every Fixed Threshold

Fixed thresholds at Rock Island 2 NW
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain4057195144
25 mm (0.98 in): Days with 25 mm or more rain4028190511
50 mm (1.97 in): Days with 50 mm or more rain38719122
100 mm (3.94 in): Days with 100 mm or more rain6219291

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1905.

Download the Data

  • Data for Rock Island 2 NW 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).