Lyman Threshold Days by Year (USC00255020)

6 fixed thresholds counted per year at Lyman (USC00255020): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Lyman Thresholds

Lyman: days with 10 mm (0.39 in) or more of precipitation in 73 years, most in 1986 with 22.
Lyman: days with 25 mm (0.98 in) or more of precipitation in 63 years, most in 1927 with 6.
Lyman: days with 10 cm (3.9 in) or more of snowfall in 56 years, most in 1978 with 7.
Lyman: days with 50 mm (1.97 in) or more of precipitation in 21 years, most in 1929 with 2.
6 fixed thresholds have at least one qualifying day at Lyman.

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

73 years with a qualifying day

Days per year at Lyman with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 22 in 1986.

Days with 10 mm (0.39 in) or more of precipitation per year at Lyman
Year	Days	Decade average
1925	11	13.4
1926	10	13.4
1927	19	13.4
1928	14	13.4
1929	13	13.4
1930	18	9.3
1931	6	9.3
1932	6	9.3
1933	13	9.3
1934	6	9.3
1935	12	9.3
1936	7	9.3
1939	6	9.3
1941	14	12.6
1942	16	12.6
1943	11	12.6
1944	7	12.6
1945	14	12.6
1946	12	12.6
1947	14	12.6
1948	10	12.6
1949	15	12.6
1950	10	11.2
1951	14	11.2
1953	7	11.2
1954	12	11.2
1955	13	11.2
1956	6	11.2
1957	17	11.2
1958	9	11.2
1959	13	11.2
1960	6	11.4
1961	12	11.4
1962	14	11.4
1963	13	11.4
1964	6	11.4
1965	12	11.4
1966	12	11.4
1967	17	11.4
1968	13	11.4
1969	9	11.4
1970	11	10
1971	11	10
1972	11	10
1973	14	10
1974	9	10
1975	9	10
1976	6	10
1977	9	10
1978	10	10
1979	10	10
1981	14	14
1982	20	14
1983	14	14
1984	9	14
1985	10	14
1986	22	14
1987	17	14
1988	11	14
1989	9	14
1990	17	13.1
1991	17	13.1
1992	13	13.1
1994	10	13.1
1995	16	13.1
1996	10	13.1
1998	11	13.1
1999	11	13.1
2000	16	11.8
2001	15	11.8
2002	8	11.8
2003	10	11.8
2005	10	11.8

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

First to last qualifying date each year at Lyman
Year	First date	Last date
1925	1925-03-30	1925-12-20
1926	1926-05-09	1926-10-30
1927	1927-03-17	1927-10-01
1928	1928-02-29	1928-11-01
1929	1929-03-12	1929-10-29
1930	1930-04-28	1930-10-11
1931	1931-03-26	1931-10-21
1932	1932-03-20	1932-09-25
1933	1933-03-04	1933-12-01
1934	1934-05-13	1934-09-20
1935	1935-03-04	1935-09-08
1936	1936-04-05	1936-12-17
1939	1939-02-16	1939-10-09
1941	1941-04-07	1941-12-25
1942	1942-03-19	1942-11-21
1943	1943-04-11	1943-10-30
1944	1944-01-27	1944-11-07
1945	1945-04-02	1945-12-01
1946	1946-03-15	1946-10-17
1947	1947-04-23	1947-10-23
1948	1948-04-24	1948-10-29
1949	1949-03-08	1949-10-19
1950	1950-04-10	1950-09-20
1951	1951-04-24	1951-10-06
1953	1953-02-10	1953-11-19
1954	1954-04-26	1954-10-25
1955	1955-01-05	1955-11-11
1956	1956-05-13	1956-08-03
1957	1957-04-03	1957-10-19
1958	1958-04-04	1958-12-04
1959	1959-03-25	1959-10-30
1960	1960-04-27	1960-12-04
1961	1961-03-18	1961-10-29
1962	1962-04-21	1962-10-06
1963	1963-05-14	1963-10-20
1964	1964-04-02	1964-06-21
1965	1965-05-08	1965-09-16
1966	1966-06-04	1966-10-14
1967	1967-04-13	1967-08-30
1968	1968-04-02	1968-10-15
1969	1969-04-08	1969-10-29
1970	1970-01-21	1970-10-07
1971	1971-03-24	1971-09-21
1972	1972-03-21	1972-09-05
1973	1973-01-20	1973-12-18
1974	1974-03-11	1974-09-12
1975	1975-04-07	1975-12-31
1976	1976-04-16	1976-07-25
1977	1977-03-28	1977-12-08
1978	1978-05-07	1978-12-02
1979	1979-05-09	1979-12-27
1981	1981-04-19	1981-11-30
1982	1982-05-13	1982-11-11
1983	1983-01-25	1983-11-26
1984	1984-02-15	1984-10-04
1985	1985-04-19	1985-10-11
1986	1986-04-04	1986-10-23
1987	1987-02-27	1987-12-27
1988	1988-04-22	1988-09-14
1989	1989-03-19	1989-10-26
1990	1990-01-19	1990-11-05
1991	1991-04-12	1991-11-06
1992	1992-01-07	1992-11-24
1994	1994-03-06	1994-10-17
1995	1995-05-08	1995-12-06
1996	1996-04-27	1996-10-26
1998	1998-02-25	1998-10-27
1999	1999-04-08	1999-09-03
2000	2000-03-07	2000-10-22
2001	2001-04-02	2001-11-26
2002	2002-03-14	2002-10-29
2003	2003-03-17	2003-12-08
2005	2005-04-20	2005-08-12

Every Fixed Threshold

Fixed thresholds at Lyman
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	73	22	1986	10
25 mm (0.98 in): Days with 25 mm or more rain	63	6	1927	5
50 mm (1.97 in): Days with 50 mm or more rain	21	2	1929	1
10 cm (3.9 in): Days with 10 cm or more snowfall	56	7	1978	2
25 cm (9.8 in): Days with 25 cm or more snowfall	13	1	1925	1
50 cm (19.7 in): Days with 50 cm or more snowfall	3	1	1927	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1925.

Download the Data

Data for Lyman 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).

Lyman Threshold Days by Year (USC00255020)

Key Facts for Lyman Thresholds

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

Every Fixed Threshold

Download the Data

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