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Built 2026-10-19 (19 October 2026)

Ia?U Threshold Days by Year (BR001240016)

4 fixed thresholds counted per year at Ia?U (BR001240016): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Ia?U Thresholds

  • Ia?U: days with 10 mm (0.39 in) or more of precipitation in 46 years, most in 1964 with 35.
  • Ia?U: days with 25 mm (0.98 in) or more of precipitation in 44 years, most in 1964 with 22.
  • Ia?U: days with 50 mm (1.97 in) or more of precipitation in 35 years, most in 1964 with 14.
  • Ia?U: days with 100 mm (3.94 in) or more of precipitation in 7 years, most in 1964 with 2.
  • 4 fixed thresholds have at least one qualifying day at Ia?U.
46 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Ia?U Days per year at Ia?U with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 35 in 1964. 0102030401945: 161946: 71947: 211948: 191949: 61950: 91951: 61952: 131953: 131956: 141957: 211958: 181959: 101960: 171961: 91964: 351965: 121966: 251967: 161968: 181969: 271973: 101974: 131975: 91976: 141977: 111978: 191979: 231980: 251981: 241982: 81983: 161984: 141985: 261986: 131988: 171989: 321990: 31991: 131992: 251993: 41994: 151995: 191996: 71997: 241998: 61945195019571964196919771982198819931998
Days per year at Ia?U with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 35 in 1964.
Days with 10 mm (0.39 in) or more of precipitation per year at Ia?U
YearDaysDecade average
19451613.8
1946713.8
19472113.8
19481913.8
1949613.8
1950913
1951613
19521313
19531313
19561413
19572113
19581813
19591013
19601719.9
1961919.9
19643519.9
19651219.9
19662519.9
19671619.9
19681819.9
19692719.9
19731014.1
19741314.1
1975914.1
19761414.1
19771114.1
19781914.1
19792314.1
19802519.4
19812419.4
1982819.4
19831619.4
19841419.4
19852619.4
19861319.4
19881719.4
19893219.4
1990312.9
19911312.9
19922512.9
1993412.9
19941512.9
19951912.9
1996712.9
19972412.9
1998612.9
First to last qualifying date each year at Ia?U For each year, a bar from the first to the last day at Ia?U meeting 10 mm (0.39 in). 1945: 9 January 1945 to 20 December 19451946: 13 February 1946 to 18 November 19461947: 22 January 1947 to 1 December 19471948: 29 February 1948 to 25 December 19481949: 4 January 1949 to 20 December 19491950: 15 January 1950 to 25 December 19501951: 30 March 1951 to 21 December 19511952: 29 February 1952 to 19 December 19521953: 4 January 1953 to 21 December 19531956: 1 January 1956 to 23 December 19561957: 7 January 1957 to 29 December 19571958: 18 January 1958 to 31 December 19581959: 1 January 1959 to 17 November 19591960: 2 January 1960 to 4 December 19601961: 18 January 1961 to 9 December 19611964: 1 January 1964 to 6 December 19641965: 9 January 1965 to 25 November 19651966: 15 January 1966 to 27 December 19661967: 16 February 1967 to 30 December 19671968: 3 February 1968 to 22 December 19681969: 23 January 1969 to 28 December 19691973: 18 February 1973 to 23 November 19731974: 3 January 1974 to 10 December 19741975: 5 February 1975 to 15 December 19751976: 29 February 1976 to 1 December 19761977: 11 January 1977 to 29 December 19771978: 12 January 1978 to 19 December 19781979: 8 January 1979 to 23 December 19791980: 1 January 1980 to 19 December 19801981: 22 January 1981 to 31 December 19811982: 14 January 1982 to 29 December 19821983: 20 January 1983 to 31 December 19831984: 29 February 1984 to 16 November 19841985: 9 January 1985 to 11 December 19851986: 29 January 1986 to 29 December 19861988: 12 January 1988 to 17 December 19881989: 5 February 1989 to 24 December 19891990: 16 February 1990 to 31 December 19901991: 13 January 1991 to 4 December 19911992: 11 January 1992 to 28 December 19921993: 7 January 1993 to 7 October 19931994: 6 February 1994 to 20 December 19941995: 6 January 1995 to 10 December 19951996: 29 February 1996 to 27 November 19961997: 3 January 1997 to 3 December 19971998: 23 January 1998 to 4 December 199819451951195919671976198219891995JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Ia?U meeting 10 mm (0.39 in).
First to last qualifying date each year at Ia?U
YearFirst dateLast date
19451945-01-091945-12-20
19461946-02-131946-11-18
19471947-01-221947-12-01
19481948-02-291948-12-25
19491949-01-041949-12-20
19501950-01-151950-12-25
19511951-03-301951-12-21
19521952-02-291952-12-19
19531953-01-041953-12-21
19561956-01-011956-12-23
19571957-01-071957-12-29
19581958-01-181958-12-31
19591959-01-011959-11-17
19601960-01-021960-12-04
19611961-01-181961-12-09
19641964-01-011964-12-06
19651965-01-091965-11-25
19661966-01-151966-12-27
19671967-02-161967-12-30
19681968-02-031968-12-22
19691969-01-231969-12-28
19731973-02-181973-11-23
19741974-01-031974-12-10
19751975-02-051975-12-15
19761976-02-291976-12-01
19771977-01-111977-12-29
19781978-01-121978-12-19
19791979-01-081979-12-23
19801980-01-011980-12-19
19811981-01-221981-12-31
19821982-01-141982-12-29
19831983-01-201983-12-31
19841984-02-291984-11-16
19851985-01-091985-12-11
19861986-01-291986-12-29
19881988-01-121988-12-17
19891989-02-051989-12-24
19901990-02-161990-12-31
19911991-01-131991-12-04
19921992-01-111992-12-28
19931993-01-071993-10-07
19941994-02-061994-12-20
19951995-01-061995-12-10
19961996-02-291996-11-27
19971997-01-031997-12-03
19981998-01-231998-12-04

Every Fixed Threshold

Fixed thresholds at Ia?U
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain463519646
25 mm (0.98 in): Days with 25 mm or more rain442219643
50 mm (1.97 in): Days with 50 mm or more rain351419643
100 mm (3.94 in): Days with 100 mm or more rain7219642

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1945.

Download the Data

  • Data for Ia?U 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).