South Dandalup Dam Threshold Days by Year

4 fixed thresholds counted per year at South Dandalup Dam (ASN00009873): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for South Dandalup Dam Thresholds

South Dandalup Dam: days with 10 mm (0.39 in) or more of precipitation in 35 years, most in 1974 with 53.
South Dandalup Dam: days with 25 mm (0.98 in) or more of precipitation in 35 years, most in 1974 with 25.
South Dandalup Dam: days with 50 mm (1.97 in) or more of precipitation in 29 years, most in 1983 with 5.
South Dandalup Dam: 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 South Dandalup Dam.

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

35 years with a qualifying day

Days per year at South Dandalup Dam with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 53 in 1974.

Days with 10 mm (0.39 in) or more of precipitation per year at South Dandalup Dam
Year	Days	Decade average
1974	53	38.2
1975	33	38.2
1976	35	38.2
1977	28	38.2
1978	44	38.2
1979	36	38.2
1980	45	41.4
1981	46	41.4
1982	35	41.4
1983	47	41.4
1984	44	41.4
1985	37	41.4
1986	40	41.4
1987	31	41.4
1988	47	41.4
1989	42	41.4
1990	51	42.6
1991	52	42.6
1993	36	42.6
1994	32	42.6
1995	38	42.6
1996	49	42.6
1997	37	42.6
1998	47	42.6
1999	41	42.6
2000	45	38.8
2001	30	38.8
2002	46	38.8
2003	42	38.8
2004	36	38.8
2005	42	38.8
2006	29	38.8
2007	40	38.8
2008	38	38.8
2009	40	38.8

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

First to last qualifying date each year at South Dandalup Dam
Year	First date	Last date
1974	1974-04-04	1974-10-30
1975	1975-05-05	1975-11-16
1976	1976-01-07	1976-11-28
1977	1977-05-07	1977-10-28
1978	1978-02-18	1978-12-16
1979	1979-03-15	1979-11-14
1980	1980-02-11	1980-12-31
1981	1981-03-06	1981-12-10
1982	1982-01-21	1982-12-12
1983	1983-02-06	1983-12-31
1984	1984-03-16	1984-12-28
1985	1985-02-10	1985-11-09
1986	1986-02-22	1986-11-30
1987	1987-03-17	1987-12-24
1988	1988-04-28	1988-11-12
1989	1989-01-06	1989-10-18
1990	1990-01-10	1990-11-19
1991	1991-02-26	1991-12-25
1993	1993-02-06	1993-11-10
1994	1994-05-21	1994-11-27
1995	1995-05-10	1995-12-29
1996	1996-01-30	1996-12-12
1997	1997-02-20	1997-11-22
1998	1998-03-10	1998-12-15
1999	1999-01-23	1999-12-30
2000	2000-01-15	2000-11-27
2001	2001-05-06	2001-12-01
2002	2002-04-17	2002-11-01
2003	2003-03-31	2003-11-25
2004	2004-05-10	2004-11-26
2005	2005-03-11	2005-12-11
2006	2006-01-13	2006-11-29
2007	2007-03-02	2007-12-12
2008	2008-04-01	2008-11-23
2009	2009-02-26	2009-11-19

Every Fixed Threshold

Fixed thresholds at South Dandalup Dam
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	35	53	1974	40
25 mm (0.98 in): Days with 25 mm or more rain	35	25	1974	17
50 mm (1.97 in): Days with 50 mm or more rain	29	5	1983	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 1974.

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Data for South Dandalup Dam 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).

South Dandalup Dam Threshold Days by Year

Key Facts for South Dandalup Dam Thresholds

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

Every Fixed Threshold

Download the Data

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