Waterloo Muni AP Threshold Days by Year (USW00094910)

18 fixed thresholds counted per year at Waterloo Muni AP (USW00094910): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Waterloo Muni AP Thresholds

Waterloo Muni AP: days with a maximum temperature at or above 30 C (86 F) in 76 years, most in 1988 with 74.
Waterloo Muni AP: days with a maximum temperature at or above 90 F (32.2 C) in 76 years, most in 1988 with 50.
Waterloo Muni AP: days with a maximum temperature at or below 0 C (32 F) in 76 years, most in 1978 with 97.
Waterloo Muni AP: nights with a minimum temperature at or below 0 C (32 F) in 76 years, most in 1976 with 178.
18 fixed thresholds have at least one qualifying day at Waterloo Muni AP.

Days at or above 30 C (86 F)

76 years with a qualifying day

Days per year at Waterloo Muni AP with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 74 in 1988.

Days at or above 30 C (86 F) per year at Waterloo Muni AP
Year	Days	Decade average
1951	19	42.7
1952	60	42.7
1953	53	42.7
1954	49	42.7
1955	55	42.7
1956	45	42.7
1957	35	42.7
1958	21	42.7
1959	47	42.7
1960	35	30.4
1961	32	30.4
1962	29	30.4
1963	49	30.4
1964	46	30.4
1965	19	30.4
1966	33	30.4
1967	12	30.4
1968	25	30.4
1969	24	30.4
1970	41	35.9
1971	21	35.9
1972	33	35.9
1973	39	35.9
1974	29	35.9
1975	52	35.9
1976	46	35.9
1977	29	35.9
1978	39	35.9
1979	30	35.9
1980	46	41.5
1981	16	41.5
1982	24	41.5
1983	57	41.5
1984	34	41.5
1985	38	41.5
1986	30	41.5
1987	55	41.5
1988	74	41.5
1989	41	41.5
1990	25	32.6
1991	45	32.6
1992	19	32.6
1993	26	32.6
1994	33	32.6
1995	49	32.6
1996	29	32.6
1997	27	32.6
1998	34	32.6
1999	39	32.6
2000	34	37.3
2001	41	37.3
2002	49	37.3
2003	52	37.3
2004	28	37.3
2005	47	37.3
2006	38	37.3
2007	43	37.3
2008	26	37.3
2009	15	37.3
2010	37	37.2
2011	45	37.2
2012	61	37.2
2013	40	37.2
2014	21	37.2
2015	22	37.2
2016	28	37.2
2017	33	37.2
2018	38	37.2
2019	47	37.2
2020	59	53.1
2021	67	53.1
2022	50	53.1
2023	66	53.1
2024	48	53.1
2025	43	53.1
2026	39	53.1

For each year, a bar from the first to the last day at Waterloo Muni AP meeting 30 C (86 F).

First to last qualifying date each year at Waterloo Muni AP
Year	First date	Last date
1951	1951-07-07	1951-09-11
1952	1952-04-29	1952-10-01
1953	1953-05-25	1953-10-03
1954	1954-06-11	1954-09-27
1955	1955-05-21	1955-09-18
1956	1956-05-12	1956-09-25
1957	1957-06-05	1957-09-01
1958	1958-06-04	1958-09-03
1959	1959-05-02	1959-09-20
1960	1960-04-22	1960-09-07
1961	1961-05-13	1961-09-10
1962	1962-05-05	1962-09-12
1963	1963-05-08	1963-10-06
1964	1964-04-16	1964-09-09
1965	1965-06-11	1965-09-09
1966	1966-05-26	1966-09-01
1967	1967-05-18	1967-07-29
1968	1968-06-03	1968-09-03
1969	1969-05-27	1969-08-30
1970	1970-04-28	1970-09-20
1971	1971-06-04	1971-10-01
1972	1972-05-19	1972-09-18
1973	1973-06-08	1973-09-01
1974	1974-06-14	1974-09-26
1975	1975-05-18	1975-10-13
1976	1976-06-06	1976-10-01
1977	1977-05-15	1977-08-27
1978	1978-05-25	1978-09-11
1979	1979-05-09	1979-09-11
1980	1980-04-21	1980-09-20
1981	1981-04-27	1981-09-11
1982	1982-05-04	1982-09-11
1983	1983-06-10	1983-10-02
1984	1984-05-17	1984-09-24
1985	1985-04-18	1985-09-19
1986	1986-03-29	1986-09-26
1987	1987-04-20	1987-09-05
1988	1988-05-14	1988-09-18
1989	1989-05-29	1989-08-22
1990	1990-06-12	1990-10-05
1991	1991-04-06	1991-09-09
1992	1992-04-30	1992-10-02
1993	1993-05-14	1993-10-07
1994	1994-04-18	1994-09-30
1995	1995-06-07	1995-10-12
1996	1996-05-17	1996-09-05
1997	1997-06-13	1997-10-07
1998	1998-05-14	1998-09-26
1999	1999-05-27	1999-10-12
2000	2000-05-04	2000-09-18
2001	2001-05-14	2001-09-03
2002	2002-04-15	2002-09-30
2003	2003-04-01	2003-10-20
2004	2004-04-16	2004-09-21
2005	2005-06-06	2005-10-04
2006	2006-04-13	2006-10-03
2007	2007-04-29	2007-10-06
2008	2008-06-05	2008-09-02
2009	2009-04-24	2009-08-14
2010	2010-05-23	2010-10-09
2011	2011-04-10	2011-09-12
2012	2012-05-15	2012-09-11
2013	2013-05-14	2013-09-19
2014	2014-05-20	2014-09-04
2015	2015-06-09	2015-09-16
2016	2016-05-06	2016-09-20
2017	2017-05-15	2017-09-25
2018	2018-05-24	2018-09-20
2019	2019-04-21	2019-09-30
2020	2020-05-25	2020-10-09
2021	2021-05-01	2021-09-30
2022	2022-05-09	2022-09-20
2023	2023-04-12	2023-10-03
2024	2024-05-12	2024-10-11
2025	2025-05-12	2025-10-04
2026	2026-03-21	2026-10-12

Every Fixed Threshold

Fixed thresholds at Waterloo Muni AP
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	76	74	1988	39
35 C (95 F): Days	52	23	1988	1
40 C (104 F): Days	3	3	1988	1
90 F (32.2 C): Days	76	50	1988	12
100 F (37.8 C): Days	13	11	1988	4
0 C (32 F): Ice days (max	76	97	1978	36
0 C (32 F): Frost days (min	76	178	1976	84
-10 C (14 F): Days with min	76	90	1978	32
-20 C (-4 F): Days with min	76	43	1963	9
-30 C (-22 F): Days with min	27	7	1963	2
20 C (68 F): Tropical nights (min	76	32	1975	25
25 C (77 F): Days with min	20	3	1988	3
10 mm (0.39 in): Days with 10 mm or more rain	76	42	1993	36
25 mm (0.98 in): Days with 25 mm or more rain	76	18	2018	12
50 mm (1.97 in): Days with 50 mm or more rain	58	7	2018	2
100 mm (3.94 in): Days with 100 mm or more rain	5	2	1968	1
10 cm (3.9 in): Days with 10 cm or more snowfall	63	5	2000	1
25 cm (9.8 in): Days with 25 cm or more snowfall	7	2	2015	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1951.

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Data for Waterloo Muni AP 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 2026-10-17. Last revised 17 October 2026 (2026-10-17).

Waterloo Muni AP Threshold Days by Year (USW00094910)

Key Facts for Waterloo Muni AP Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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