Iuna Threshold Days by Year (BR002041013)

4 fixed thresholds counted per year at Iuna (BR002041013): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Iuna Thresholds

Iuna: days with 10 mm (0.39 in) or more of precipitation in 41 years, most in 1965 with 50.
Iuna: days with 25 mm (0.98 in) or more of precipitation in 41 years, most in 1962 with 21.
Iuna: days with 50 mm (1.97 in) or more of precipitation in 36 years, most in 1997 with 9.
Iuna: days with 100 mm (3.94 in) or more of precipitation in 6 years, most in 1961 with 1.
4 fixed thresholds have at least one qualifying day at Iuna.

Days with 10 mm (0.39 in) or more of precipitation

41 years with a qualifying day

Days per year at Iuna with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 50 in 1965.

Days with 10 mm (0.39 in) or more of precipitation per year at Iuna
Year	Days	Decade average
1954	21	32.8
1955	19	32.8
1956	30	32.8
1957	45	32.8
1958	43	32.8
1959	39	32.8
1960	32	35.1
1961	32	35.1
1962	49	35.1
1963	16	35.1
1965	50	35.1
1966	19	35.1
1967	34	35.1
1968	47	35.1
1969	37	35.1
1971	45	39.6
1972	45	39.6
1973	33	39.6
1974	32	39.6
1975	39	39.6
1978	37	39.6
1979	46	39.6
1980	35	35
1981	30	35
1982	25	35
1983	45	35
1985	46	35
1986	19	35
1988	32	35
1989	48	35
1990	44	41.8
1991	44	41.8
1992	50	41.8
1993	24	41.8
1994	38	41.8
1995	44	41.8
1996	42	41.8
1997	47	41.8
1998	50	41.8
1999	35	41.8
2000	48	48

For each year, a bar from the first to the last day at Iuna meeting 10 mm (0.39 in).

First to last qualifying date each year at Iuna
Year	First date	Last date
1954	1954-02-14	1954-12-30
1955	1955-01-12	1955-11-21
1956	1956-03-03	1956-12-29
1957	1957-01-10	1957-12-25
1958	1958-01-12	1958-12-31
1959	1959-01-03	1959-12-29
1960	1960-01-19	1960-12-20
1961	1961-01-06	1961-12-31
1962	1962-01-04	1962-12-24
1963	1963-01-13	1963-12-14
1965	1965-01-05	1965-12-31
1966	1966-01-01	1966-12-31
1967	1967-01-01	1967-12-31
1968	1968-01-04	1968-12-30
1969	1969-01-17	1969-12-27
1971	1971-01-16	1971-12-31
1972	1972-01-08	1972-12-29
1973	1973-01-07	1973-12-14
1974	1974-01-01	1974-12-28
1975	1975-01-01	1975-12-26
1978	1978-01-03	1978-12-20
1979	1979-01-05	1979-12-31
1980	1980-01-01	1980-12-30
1981	1981-01-01	1981-12-28
1982	1982-01-04	1982-12-29
1983	1983-01-01	1983-12-27
1985	1985-01-01	1985-12-22
1986	1986-01-03	1986-12-31
1988	1988-01-01	1988-12-25
1989	1989-01-01	1989-12-28
1990	1990-01-24	1990-12-27
1991	1991-01-04	1991-12-29
1992	1992-01-01	1992-12-30
1993	1993-01-06	1993-12-31
1994	1994-01-01	1994-12-25
1995	1995-01-22	1995-12-29
1996	1996-01-01	1996-12-31
1997	1997-01-02	1997-12-20
1998	1998-01-04	1998-12-31
1999	1999-01-04	1999-12-15
2000	2000-01-01	2000-12-24

Every Fixed Threshold

Fixed thresholds at Iuna
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
10 mm (0.39 in): Days with 10 mm or more rain	41	50	1965	48
25 mm (0.98 in): Days with 25 mm or more rain	41	21	1962	18
50 mm (1.97 in): Days with 50 mm or more rain	36	9	1997	3
100 mm (3.94 in): Days with 100 mm or more rain	6	1	1961	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1954.

Download the Data

Data for Iuna 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 2025-12-31. Last revised 31 December 2025 (2025-12-31).

Iuna Threshold Days by Year (BR002041013)

Key Facts for Iuna Thresholds

Days with 10 mm (0.39 in) or more of precipitation

Every Fixed Threshold

Download the Data

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