Glen Mervyn Threshold Days by Year

4 fixed thresholds counted per year at Glen Mervyn (ASN00009705): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Glen Mervyn Thresholds

Glen Mervyn: days with 10 mm (0.39 in) or more of precipitation in 54 years, most in 1917 with 58.
Glen Mervyn: days with 25 mm (0.98 in) or more of precipitation in 54 years, most in 1917 with 19.
Glen Mervyn: days with 50 mm (1.97 in) or more of precipitation in 23 years, most in 1927 with 8.
Glen Mervyn: days with 100 mm (3.94 in) or more of precipitation in 1 years, most in 1982 with 1.
4 fixed thresholds have at least one qualifying day at Glen Mervyn.

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

54 years with a qualifying day

Days per year at Glen Mervyn with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 58 in 1917.

Days with 10 mm (0.39 in) or more of precipitation per year at Glen Mervyn
Year	Days	Decade average
1907	38	30.7
1908	25	30.7
1909	29	30.7
1910	37	32.8
1911	20	32.8
1912	26	32.8
1913	34	32.8
1914	22	32.8
1915	36	32.8
1916	29	32.8
1917	58	32.8
1918	41	32.8
1919	25	32.8
1920	30	29.5
1921	34	29.5
1922	34	29.5
1925	24	29.5
1927	24	29.5
1929	31	29.5
1930	42	42
1968	26	23
1969	20	23
1970	34	28.5
1971	32	28.5
1972	21	28.5
1973	34	28.5
1974	44	28.5
1975	24	28.5
1976	27	28.5
1977	23	28.5
1978	31	28.5
1979	15	28.5
1980	33	27.2
1981	25	27.2
1982	22	27.2
1983	32	27.2
1984	26	27.2
1985	26	27.2
1986	27	27.2
1987	27	27.2
1988	31	27.2
1989	23	27.2
1990	36	30.2
1991	33	30.2
1992	36	30.2
1993	24	30.2
1994	24	30.2
1995	24	30.2
1996	41	30.2
1997	22	30.2
1998	32	30.2
1999	30	30.2
2000	24	18.5
2001	13	18.5

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

First to last qualifying date each year at Glen Mervyn
Year	First date	Last date
1907	1907-02-08	1907-11-29
1908	1908-02-26	1908-11-24
1909	1909-01-18	1909-10-22
1910	1910-01-04	1910-11-21
1911	1911-04-26	1911-10-20
1912	1912-05-05	1912-11-14
1913	1913-03-16	1913-12-20
1914	1914-02-17	1914-11-22
1915	1915-02-26	1915-11-13
1916	1916-01-04	1916-11-23
1917	1917-02-09	1917-12-21
1918	1918-01-20	1918-10-25
1919	1919-01-16	1919-10-17
1920	1920-03-29	1920-10-10
1921	1921-01-27	1921-11-17
1922	1922-02-23	1922-12-06
1925	1925-03-04	1925-10-19
1927	1927-01-11	1927-12-14
1929	1929-02-08	1929-09-04
1930	1930-04-21	1930-11-01
1968	1968-01-07	1968-10-20
1969	1969-03-13	1969-11-03
1970	1970-02-05	1970-10-06
1971	1971-02-01	1971-11-23
1972	1972-04-20	1972-10-28
1973	1973-04-16	1973-10-29
1974	1974-04-04	1974-11-18
1975	1975-03-08	1975-11-17
1976	1976-01-07	1976-11-28
1977	1977-01-18	1977-10-27
1978	1978-01-08	1978-12-23
1979	1979-04-18	1979-11-10
1980	1980-02-11	1980-12-31
1981	1981-03-06	1981-11-26
1982	1982-01-21	1982-11-27
1983	1983-05-02	1983-12-31
1984	1984-04-30	1984-12-28
1985	1985-02-10	1985-11-08
1986	1986-01-09	1986-11-09
1987	1987-03-17	1987-12-24
1988	1988-03-24	1988-11-12
1989	1989-02-16	1989-12-24
1990	1990-01-29	1990-10-30
1991	1991-04-10	1991-12-25
1992	1992-02-07	1992-11-20
1993	1993-03-18	1993-10-02
1994	1994-05-21	1994-10-14
1995	1995-05-10	1995-10-18
1996	1996-05-08	1996-12-12
1997	1997-02-25	1997-11-21
1998	1998-03-10	1998-09-22
1999	1999-05-06	1999-12-20
2000	2000-01-15	2000-11-08
2001	2001-05-06	2001-12-01

Every Fixed Threshold

Fixed thresholds at Glen Mervyn
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	54	58	1917	13
25 mm (0.98 in): Days with 25 mm or more rain	54	19	1917	3
50 mm (1.97 in): Days with 50 mm or more rain	23	8	1927	1
100 mm (3.94 in): Days with 100 mm or more rain	1	1	1982	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1907.

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Data for Glen Mervyn 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 2026-10-15 (15 October 2026). Threshold counts are computed by this site.

Data as of 2025-12-31. Last revised 31 December 2025 (2025-12-31).

Glen Mervyn Threshold Days by Year

Key Facts for Glen Mervyn Thresholds

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

Every Fixed Threshold

Download the Data

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