Byssa Threshold Days by Year (RSM00031397)

3 fixed thresholds counted per year at Byssa (RSM00031397): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Byssa Thresholds

Byssa: days with 10 mm (0.39 in) or more of precipitation in 57 years, most in 1972 with 35.
Byssa: days with 25 mm (0.98 in) or more of precipitation in 57 years, most in 1936 with 10.
Byssa: days with 50 mm (1.97 in) or more of precipitation in 28 years, most in 1953 with 3.
3 fixed thresholds have at least one qualifying day at Byssa.

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

57 years with a qualifying day

Days per year at Byssa with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 35 in 1972.

Days with 10 mm (0.39 in) or more of precipitation per year at Byssa
Year	Days	Decade average
1936	25	21.3
1937	22	21.3
1938	20	21.3
1939	18	21.3
1940	26	19.1
1941	15	19.1
1942	24	19.1
1943	19	19.1
1944	11	19.1
1945	27	19.1
1946	24	19.1
1947	15	19.1
1948	19	19.1
1949	11	19.1
1950	18	20.2
1951	24	20.2
1952	13	20.2
1953	21	20.2
1954	15	20.2
1955	22	20.2
1956	24	20.2
1957	24	20.2
1958	23	20.2
1959	18	20.2
1960	18	21.4
1961	28	21.4
1962	23	21.4
1963	26	21.4
1964	17	21.4
1965	14	21.4
1966	24	21.4
1967	28	21.4
1968	18	21.4
1969	18	21.4
1970	25	21.4
1971	22	21.4
1972	35	21.4
1973	22	21.4
1974	18	21.4
1975	14	21.4
1976	22	21.4
1977	15	21.4
1978	23	21.4
1979	18	21.4
1980	14	18.3
1981	15	18.3
1982	28	18.3
1983	22	18.3
1984	18	18.3
1985	22	18.3
1986	14	18.3
1987	19	18.3
1988	12	18.3
1989	19	18.3
1990	19	19
1991	16	19
1992	22	19

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

First to last qualifying date each year at Byssa
Year	First date	Last date
1936	1936-05-12	1936-10-12
1937	1937-04-11	1937-10-12
1938	1938-04-19	1938-10-30
1939	1939-03-10	1939-11-07
1940	1940-04-24	1940-11-06
1941	1941-04-03	1941-11-02
1942	1942-04-27	1942-11-13
1943	1943-05-21	1943-11-03
1944	1944-05-02	1944-09-16
1945	1945-04-22	1945-11-22
1946	1946-05-07	1946-10-12
1947	1947-05-12	1947-09-19
1948	1948-04-25	1948-09-01
1949	1949-07-16	1949-09-16
1950	1950-04-26	1950-09-27
1951	1951-05-12	1951-10-24
1952	1952-05-29	1952-09-28
1953	1953-04-08	1953-09-16
1954	1954-06-16	1954-11-23
1955	1955-05-12	1955-12-14
1956	1956-04-24	1956-11-04
1957	1957-05-18	1957-09-23
1958	1958-05-09	1958-09-22
1959	1959-04-11	1959-11-01
1960	1960-06-01	1960-11-21
1961	1961-04-29	1961-11-09
1962	1962-04-07	1962-10-11
1963	1963-03-20	1963-10-28
1964	1964-06-13	1964-10-21
1965	1965-05-05	1965-10-04
1966	1966-04-19	1966-10-29
1967	1967-04-30	1967-09-13
1968	1968-04-12	1968-09-28
1969	1969-03-20	1969-11-11
1970	1970-03-29	1970-09-28
1971	1971-04-08	1971-09-18
1972	1972-04-03	1972-10-20
1973	1973-04-13	1973-11-24
1974	1974-05-14	1974-11-07
1975	1975-05-02	1975-09-26
1976	1976-04-23	1976-10-17
1977	1977-05-27	1977-09-18
1978	1978-04-14	1978-10-18
1979	1979-05-05	1979-09-21
1980	1980-04-19	1980-11-05
1981	1981-05-02	1981-08-26
1982	1982-04-23	1982-10-18
1983	1983-04-14	1983-11-02
1984	1984-05-07	1984-11-06
1985	1985-04-23	1985-09-18
1986	1986-06-19	1986-10-25
1987	1987-04-17	1987-10-02
1988	1988-05-16	1988-08-22
1989	1989-03-10	1989-09-08
1990	1990-04-01	1990-11-14
1991	1991-04-24	1991-10-11
1992	1992-04-08	1992-10-03

Every Fixed Threshold

Fixed thresholds at Byssa
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	57	35	1972	22
25 mm (0.98 in): Days with 25 mm or more rain	57	10	1936	5
50 mm (1.97 in): Days with 50 mm or more rain	28	3	1953	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1936.

Download the Data

Data for Byssa 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).

Byssa Threshold Days by Year (RSM00031397)

Key Facts for Byssa Thresholds

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

Every Fixed Threshold

Download the Data

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