Waterloo Threshold Days by Year (USC00308987)

6 fixed thresholds counted per year at Waterloo (USC00308987): 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 63 years, most in 1990 with 44.
Waterloo: days with 25 mm (0.98 in) or more of precipitation in 61 years, most in 1996 with 12.
Waterloo: days with 10 cm (3.9 in) or more of snowfall in 39 years, most in 1959 with 12.
Waterloo: days with 50 mm (1.97 in) or more of precipitation in 27 years, most in 2000 with 3.
6 fixed thresholds have at least one qualifying day at Waterloo.

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

63 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 44 in 1990.

Days with 10 mm (0.39 in) or more of precipitation per year at Waterloo
Year	Days	Decade average
1932	32	25.1
1933	24	25.1
1934	18	25.1
1935	24	25.1
1936	22	25.1
1937	28	25.1
1938	27	25.1
1939	26	25.1
1940	29	27.6
1941	21	27.6
1942	34	27.6
1943	27	27.6
1944	26	27.6
1945	32	27.6
1946	23	27.6
1947	38	27.6
1948	29	27.6
1949	17	27.6
1950	29	26.4
1951	27	26.4
1952	26	26.4
1953	21	26.4
1954	23	26.4
1955	27	26.4
1956	30	26.4
1957	24	26.4
1958	28	26.4
1959	29	26.4
1960	17	21.3
1961	30	21.3
1962	19	21.3
1963	23	21.3
1964	20	21.3
1965	18	21.3
1967	15	21.3
1968	26	21.3
1969	24	21.3
1970	33	28.8
1971	21	28.8
1972	30	28.8
1973	25	28.8
1974	30	28.8
1976	33	28.8
1977	31	28.8
1979	27	28.8
1980	24	25
1981	28	25
1982	22	25
1983	22	25
1984	26	25
1986	27	25
1987	23	25
1988	24	25
1989	29	25
1990	44	29.7
1994	29	29.7
1995	23	29.7
1996	30	29.7
1997	32	29.7
1998	27	29.7
1999	23	29.7
2000	28	26
2009	24	26

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
1932	1932-01-02	1932-12-31
1933	1933-01-23	1933-11-27
1934	1934-03-28	1934-12-02
1935	1935-01-09	1935-12-14
1936	1936-01-10	1936-12-30
1937	1937-01-15	1937-12-18
1938	1938-01-01	1938-11-19
1939	1939-01-30	1939-12-21
1940	1940-01-05	1940-12-27
1941	1941-01-24	1941-12-24
1942	1942-01-31	1942-12-31
1943	1943-01-04	1943-11-22
1944	1944-02-12	1944-12-28
1945	1945-01-01	1945-11-30
1946	1946-02-27	1946-12-28
1947	1947-01-03	1947-12-16
1948	1948-01-02	1948-12-31
1949	1949-01-27	1949-09-29
1950	1950-01-07	1950-12-04
1951	1951-02-01	1951-12-26
1952	1952-01-18	1952-12-11
1953	1953-01-18	1953-12-10
1954	1954-01-27	1954-12-30
1955	1955-02-07	1955-12-04
1956	1956-01-31	1956-12-23
1957	1957-01-23	1957-12-21
1958	1958-01-16	1958-11-29
1959	1959-01-16	1959-12-29
1960	1960-01-13	1960-12-21
1961	1961-02-04	1961-11-24
1962	1962-01-16	1962-11-22
1963	1963-01-27	1963-12-09
1964	1964-01-06	1964-12-28
1965	1965-01-04	1965-12-27
1967	1967-02-02	1967-11-23
1968	1968-01-15	1968-12-23
1969	1969-01-30	1969-12-11
1970	1970-02-10	1970-12-17
1971	1971-02-09	1971-12-07
1972	1972-01-03	1972-12-22
1973	1973-01-23	1973-12-21
1974	1974-01-29	1974-12-17
1976	1976-01-27	1976-12-07
1977	1977-02-25	1977-12-19
1979	1979-01-02	1979-12-25
1980	1980-03-10	1980-11-26
1981	1981-02-21	1981-12-23
1982	1982-01-25	1982-11-29
1983	1983-03-11	1983-12-14
1984	1984-02-15	1984-12-24
1986	1986-02-05	1986-12-29
1987	1987-01-05	1987-12-21
1988	1988-02-04	1988-11-21
1989	1989-03-31	1989-11-21
1990	1990-01-02	1990-12-31
1994	1994-01-05	1994-12-12
1995	1995-01-23	1995-12-20
1996	1996-01-03	1996-12-16
1997	1997-02-05	1997-12-31
1998	1998-01-08	1998-12-22
1999	1999-01-04	1999-12-13
2000	2000-01-04	2000-11-27
2009	2009-01-07	2009-12-03

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	63	44	1990	24
25 mm (0.98 in): Days with 25 mm or more rain	61	12	1996	7
50 mm (1.97 in): Days with 50 mm or more rain	27	3	2000	3
100 mm (3.94 in): Days with 100 mm or more rain	1	1	1952	1
10 cm (3.9 in): Days with 10 cm or more snowfall	39	12	1959	2
25 cm (9.8 in): Days with 25 cm or more snowfall	12	2	1971	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1932.

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 (USC00308987)

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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