Waterloo Threshold Days by Year (USC00018686)

16 fixed thresholds counted per year at Waterloo (USC00018686): 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 26 years, most in 1944 with 52.
Waterloo: days with 25 mm (0.98 in) or more of precipitation in 26 years, most in 1944 with 26.
Waterloo: days with 50 mm (1.97 in) or more of precipitation in 26 years, most in 1950 with 7.
Waterloo: days with a maximum temperature at or above 30 C (86 F) in 12 years, most in 1970 with 118.
16 fixed thresholds have at least one qualifying day at Waterloo.

Days at or above 30 C (86 F)

12 years with a qualifying day

Days per year at Waterloo with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 118 in 1970.

Days at or above 30 C (86 F) per year at Waterloo
Year	Days	Decade average
1960	104	100.3
1961	81	100.3
1962	110	100.3
1963	89	100.3
1964	114	100.3
1967	86	100.3
1968	111	100.3
1969	107	100.3
1970	118	97
1971	97	97
1972	100	97
1974	73	97

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

First to last qualifying date each year at Waterloo
Year	First date	Last date
1960	1960-04-24	1960-09-23
1961	1961-05-08	1961-10-31
1962	1962-05-08	1962-10-17
1963	1963-05-09	1963-10-28
1964	1964-05-18	1964-09-28
1967	1967-03-12	1967-10-07
1968	1968-04-18	1968-10-13
1969	1969-05-07	1969-10-12
1970	1970-04-23	1970-10-02
1971	1971-04-19	1971-10-31
1972	1972-04-15	1972-09-27
1974	1974-03-06	1974-11-02

Every Fixed Threshold

Fixed thresholds at Waterloo
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	12	118	1970	73
35 C (95 F): Days	11	37	1969	4
40 C (104 F): Days	1	1	1969	1
90 F (32.2 C): Days	12	86	1964	43
100 F (37.8 C): Days	5	13	1969	1
0 C (32 F): Ice days (max	11	13	1963	1
0 C (32 F): Frost days (min	12	120	1960	76
-10 C (14 F): Days with min	12	29	1963	1
-20 C (-4 F): Days with min	3	1	1962	1
20 C (68 F): Tropical nights (min	12	60	1970	8
25 C (77 F): Days with min	3	3	1969	1
10 mm (0.39 in): Days with 10 mm or more rain	26	52	1944	50
25 mm (0.98 in): Days with 25 mm or more rain	26	26	1944	26
50 mm (1.97 in): Days with 50 mm or more rain	26	7	1950	6
100 mm (3.94 in): Days with 100 mm or more rain	7	2	1955	1
10 cm (3.9 in): Days with 10 cm or more snowfall	5	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 1960.

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 (USC00018686)

Key Facts for Waterloo Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

Related