Mio Hydro Plt Threshold Days by Year (USC00205531)

18 fixed thresholds counted per year at Mio Hydro Plt (USC00205531): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Mio Hydro Plt Thresholds

Mio Hydro Plt: days with a maximum temperature at or above 30 C (86 F) in 91 years, most in 1983 with 50.
Mio Hydro Plt: days with a maximum temperature at or below 0 C (32 F) in 91 years, most in 1955 with 88.
Mio Hydro Plt: days with a maximum temperature at or above 90 F (32.2 C) in 88 years, most in 1988 with 29.
Mio Hydro Plt: days with 10 mm (0.39 in) or more of precipitation in 88 years, most in 1994 with 33.
18 fixed thresholds have at least one qualifying day at Mio Hydro Plt.

Days at or above 30 C (86 F)

91 years with a qualifying day

Days per year at Mio Hydro Plt with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 50 in 1983.

Days at or above 30 C (86 F) per year at Mio Hydro Plt
Year	Days	Decade average
1897	24	24.3
1898	28	24.3
1899	21	24.3
1902	5	7.7
1903	3	7.7
1906	15	7.7
1918	30	32.5
1919	35	32.5
1920	24	19.7
1921	49	19.7
1922	20	19.7
1923	22	19.7
1924	6	19.7
1925	19	19.7
1926	13	19.7
1927	13	19.7
1928	7	19.7
1929	24	19.7
1930	26	27.9
1931	37	27.9
1932	16	27.9
1933	34	27.9
1934	30	27.9
1935	12	27.9
1936	38	27.9
1937	29	27.9
1938	26	27.9
1939	31	27.9
1940	22	23.9
1941	32	23.9
1942	13	23.9
1943	22	23.9
1944	35	23.9
1945	18	23.9
1946	20	23.9
1947	27	23.9
1948	19	23.9
1949	31	23.9
1950	18	19.4
1951	7	19.4
1952	24	19.4
1953	24	19.4
1954	18	19.4
1955	44	19.4
1956	9	19.4
1957	11	19.4
1958	8	19.4
1959	31	19.4
1961	11	17.1
1962	11	17.1
1963	18	17.1
1964	29	17.1
1965	12	17.1
1966	30	17.1
1967	4	17.1
1968	23	17.1
1969	16	17.1
1970	28	20.7
1971	20	20.7
1972	14	20.7
1973	22	20.7
1974	13	20.7
1975	23	20.7
1976	31	20.7
1977	26	20.7
1978	20	20.7
1979	10	20.7
1980	22	25.1
1981	12	25.1
1983	50	25.1
1984	17	25.1
1985	12	25.1
1986	19	25.1
1988	45	25.1
1989	24	25.1
1990	9	18.1
1991	29	18.1
1992	9	18.1
1993	17	18.1
1994	8	18.1
1996	13	18.1
1997	20	18.1
1998	28	18.1
1999	30	18.1
2000	6	20.3
2001	30	20.3
2002	34	20.3
2003	15	20.3
2004	10	20.3
2005	31	20.3
2006	16	20.3

For each year, a bar from the first to the last day at Mio Hydro Plt meeting 30 C (86 F).

First to last qualifying date each year at Mio Hydro Plt
Year	First date	Last date
1897	1897-06-12	1897-09-30
1898	1898-06-03	1898-09-03
1899	1899-04-29	1899-09-16
1902	1902-05-19	1902-07-13
1903	1903-07-08	1903-07-24
1906	1906-06-28	1906-09-17
1918	1918-05-05	1918-08-25
1919	1919-05-28	1919-09-08
1920	1920-05-31	1920-09-26
1921	1921-05-21	1921-09-10
1922	1922-05-11	1922-09-05
1923	1923-05-28	1923-08-11
1924	1924-06-20	1924-08-30
1925	1925-05-31	1925-08-30
1926	1926-05-07	1926-08-28
1927	1927-06-28	1927-09-15
1928	1928-07-07	1928-08-16
1929	1929-05-29	1929-09-04
1930	1930-05-06	1930-09-12
1931	1931-05-28	1931-09-21
1932	1932-05-15	1932-09-19
1933	1933-06-02	1933-09-08
1934	1934-05-30	1934-08-18
1935	1935-07-04	1935-09-25
1936	1936-05-07	1936-09-23
1937	1937-05-29	1937-09-03
1938	1938-06-20	1938-08-20
1939	1939-04-25	1939-09-15
1940	1940-06-02	1940-08-16
1941	1941-04-13	1941-09-22
1942	1942-05-01	1942-09-01
1943	1943-06-02	1943-08-22
1944	1944-05-26	1944-08-30
1945	1945-06-14	1945-09-07
1946	1946-05-22	1946-08-16
1947	1947-06-10	1947-10-15
1948	1948-06-01	1948-09-12
1949	1949-05-04	1949-09-04
1950	1950-06-06	1950-08-16
1951	1951-07-09	1951-08-29
1952	1952-06-06	1952-09-13
1953	1953-05-09	1953-09-03
1954	1954-06-09	1954-08-25
1955	1955-05-03	1955-09-18
1956	1956-06-07	1956-06-21
1957	1957-06-17	1957-08-03
1958	1958-07-26	1958-08-11
1959	1959-05-06	1959-09-09
1961	1961-06-28	1961-09-10
1962	1962-05-15	1962-08-24
1963	1963-06-02	1963-08-22
1964	1964-05-23	1964-08-31
1965	1965-06-21	1965-08-16
1966	1966-06-04	1966-09-02
1967	1967-06-16	1967-07-23
1968	1968-06-05	1968-08-25
1969	1969-05-28	1969-09-01
1970	1970-06-07	1970-08-27
1971	1971-06-05	1971-09-08
1972	1972-05-18	1972-07-23
1973	1973-06-10	1973-09-04
1974	1974-07-04	1974-08-23
1975	1975-05-20	1975-08-17
1976	1976-04-16	1976-09-09
1977	1977-05-13	1977-07-21
1978	1978-05-25	1978-08-15
1979	1979-06-17	1979-07-26
1980	1980-04-23	1980-08-24
1981	1981-06-15	1981-07-19
1983	1983-06-12	1983-09-11
1984	1984-06-07	1984-08-30
1985	1985-07-04	1985-09-08
1986	1986-05-29	1986-08-17
1988	1988-05-30	1988-08-18
1989	1989-06-24	1989-08-12
1990	1990-04-26	1990-09-02
1991	1991-05-13	1991-08-31
1992	1992-05-12	1992-08-26
1993	1993-05-11	1993-08-26
1994	1994-05-22	1994-08-26
1996	1996-06-14	1996-09-09
1997	1997-06-10	1997-08-03
1998	1998-05-16	1998-09-12
1999	1999-05-29	1999-09-06
2000	2000-06-09	2000-09-02
2001	2001-06-14	2001-08-10
2002	2002-04-17	2002-09-11
2003	2003-06-23	2003-08-26
2004	2004-06-09	2004-09-05
2005	2005-06-06	2005-09-13
2006	2006-05-28	2006-08-04

Every Fixed Threshold

Fixed thresholds at Mio Hydro Plt
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	91	50	1983	16
35 C (95 F): Days	45	12	1921	3
40 C (104 F): Days	2	4	1921	3
90 F (32.2 C): Days	88	29	1988	11
100 F (37.8 C): Days	6	7	1936	1
110 F (43.3 C): Days	1	1	1936	1
0 C (32 F): Ice days (max	91	88	1955	21
0 C (32 F): Frost days (min	83	215	1935	148
-10 C (14 F): Days with min	83	95	1924	27
-20 C (-4 F): Days with min	83	46	1963	1
-30 C (-22 F): Days with min	49	11	1948	2
-40 C (-40 F): Days with min	3	2	1934	2
20 C (68 F): Tropical nights (min	64	18	1921	5
10 mm (0.39 in): Days with 10 mm or more rain	88	33	1994	25
25 mm (0.98 in): Days with 25 mm or more rain	86	8	1898	3
50 mm (1.97 in): Days with 50 mm or more rain	21	2	1932	1
10 cm (3.9 in): Days with 10 cm or more snowfall	64	9	1959	2
25 cm (9.8 in): Days with 25 cm or more snowfall	14	2	1959	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1897.

Download the Data

Data for Mio Hydro Plt 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).

Mio Hydro Plt Threshold Days by Year (USC00205531)

Key Facts for Mio Hydro Plt Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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