Waterloo Threshold Days by Year (USC00359083)

4 fixed thresholds counted per year at Waterloo (USC00359083): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Waterloo Thresholds

Waterloo: days with 10 mm (0.39 in) or more of precipitation in 73 years, most in 1996 with 64.
Waterloo: days with 25 mm (0.98 in) or more of precipitation in 73 years, most in 2006 with 16.
Waterloo: days with 50 mm (1.97 in) or more of precipitation in 36 years, most in 1996 with 4.
Waterloo: days with 10 cm (3.9 in) or more of snowfall in 4 years, most in 1960 with 1.
4 fixed thresholds have at least one qualifying day at Waterloo.

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

73 years with a qualifying day

Days per year at Waterloo with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 64 in 1996.

Days with 10 mm (0.39 in) or more of precipitation per year at Waterloo
Year	Days	Decade average
1926	35	28
1929	21	28
1930	23	37.3
1931	37	37.3
1932	39	37.3
1933	38	37.3
1934	39	37.3
1937	53	37.3
1938	38	37.3
1939	31	37.3
1940	43	37.1
1941	38	37.1
1942	43	37.1
1943	36	37.1
1944	19	37.1
1945	44	37.1
1946	37	37.1
1953	53	42
1954	50	42
1956	36	42
1957	43	42
1958	35	42
1959	35	42
1960	48	38.5
1961	42	38.5
1962	34	38.5
1963	39	38.5
1964	41	38.5
1965	31	38.5
1966	31	38.5
1967	32	38.5
1968	51	38.5
1969	36	38.5
1970	43	40.7
1971	51	40.7
1972	45	40.7
1973	42	40.7
1974	44	40.7
1975	39	40.7
1976	36	40.7
1977	36	40.7
1978	34	40.7
1979	37	40.7
1980	35	39.1
1981	31	39.1
1982	48	39.1
1983	47	39.1
1984	46	39.1
1987	32	39.1
1988	45	39.1
1989	29	39.1
1990	38	42.7
1991	34	42.7
1992	37	42.7
1993	42	42.7
1994	32	42.7
1995	53	42.7
1996	64	42.7
1997	37	42.7
1998	50	42.7
1999	40	42.7
2000	40	38.8
2001	36	38.8
2002	36	38.8
2003	47	38.8
2004	35	38.8
2005	36	38.8
2006	49	38.8
2007	34	38.8
2008	40	38.8
2009	35	38.8
2010	51	42
2011	33	42

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

First to last qualifying date each year at Waterloo
Year	First date	Last date
1926	1926-01-04	1926-12-26
1929	1929-01-18	1929-12-19
1930	1930-02-07	1930-12-16
1931	1931-01-03	1931-12-31
1932	1932-01-09	1932-12-31
1933	1933-01-25	1933-12-29
1934	1934-01-13	1934-12-29
1937	1937-01-10	1937-12-30
1938	1938-01-14	1938-12-28
1939	1939-01-02	1939-12-17
1940	1940-01-04	1940-12-27
1941	1941-01-17	1941-12-23
1942	1942-01-07	1942-12-31
1943	1943-01-01	1943-12-25
1944	1944-01-01	1944-11-26
1945	1945-01-06	1945-12-30
1946	1946-01-02	1946-12-15
1953	1953-01-02	1953-12-27
1954	1954-01-03	1954-12-31
1956	1956-01-03	1956-12-21
1957	1957-01-02	1957-12-27
1958	1958-01-11	1958-12-27
1959	1959-01-05	1959-12-24
1960	1960-01-06	1960-12-19
1961	1961-01-05	1961-12-21
1962	1962-01-03	1962-12-15
1963	1963-01-02	1963-12-28
1964	1964-01-02	1964-12-26
1965	1965-01-03	1965-12-31
1966	1966-01-02	1966-12-14
1967	1967-01-05	1967-12-26
1968	1968-01-09	1968-12-30
1969	1969-01-01	1969-12-26
1970	1970-01-09	1970-12-31
1971	1971-01-08	1971-12-14
1972	1972-01-11	1972-12-27
1973	1973-01-11	1973-12-28
1974	1974-01-13	1974-12-27
1975	1975-01-04	1975-12-30
1976	1976-01-04	1976-12-26
1977	1977-01-13	1977-12-24
1978	1978-01-03	1978-12-21
1979	1979-01-10	1979-12-24
1980	1980-01-05	1980-12-27
1981	1981-02-05	1981-12-26
1982	1982-01-02	1982-12-22
1983	1983-01-04	1983-12-31
1984	1984-01-03	1984-12-30
1987	1987-01-01	1987-12-10
1988	1988-01-09	1988-12-31
1989	1989-01-10	1989-12-08
1990	1990-01-01	1990-12-17
1991	1991-01-10	1991-12-19
1992	1992-01-02	1992-12-28
1993	1993-01-04	1993-12-11
1994	1994-01-02	1994-12-17
1995	1995-01-08	1995-12-29
1996	1996-01-07	1996-12-31
1997	1997-01-01	1997-12-20
1998	1998-01-02	1998-12-28
1999	1999-01-14	1999-12-16
2000	2000-01-04	2000-12-26
2001	2001-01-14	2001-12-17
2002	2002-01-04	2002-12-31
2003	2003-01-03	2003-12-29
2004	2004-01-03	2004-12-26
2005	2005-01-07	2005-12-28
2006	2006-01-02	2006-12-27
2007	2007-01-03	2007-12-29
2008	2008-01-02	2008-12-29
2009	2009-01-01	2009-12-31
2010	2010-01-05	2010-12-29
2011	2011-01-16	2011-12-30

Every Fixed Threshold

Fixed thresholds at Waterloo
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	64	1996	33
25 mm (0.98 in): Days with 25 mm or more rain	73	16	2006	7
50 mm (1.97 in): Days with 50 mm or more rain	36	4	1996	1
10 cm (3.9 in): Days with 10 cm or more snowfall	4	1	1960	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1926.

Download the Data

Data for Waterloo 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).

Waterloo Threshold Days by Year (USC00359083)

Key Facts for Waterloo Thresholds

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

Every Fixed Threshold

Download the Data

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