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Built 2026-10-19 (19 October 2026)

Waterloo Threshold Days by Year (USC00258980)

6 fixed thresholds counted per year at Waterloo (USC00258980): 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 41 years, most in 1993 with 39.
  • Waterloo: days with 25 mm (0.98 in) or more of precipitation in 41 years, most in 1977 with 14.
  • Waterloo: days with 10 cm (3.9 in) or more of snowfall in 35 years, most in 1991 with 6.
  • Waterloo: days with 50 mm (1.97 in) or more of precipitation in 32 years, most in 1982 with 4.
  • 6 fixed thresholds have at least one qualifying day at Waterloo.
41 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Waterloo 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 39 in 1993. 0102030401953: 231954: 201956: 201957: 281958: 251959: 311960: 261961: 271962: 211966: 201967: 251970: 221971: 221972: 251973: 291974: 181975: 171976: 111977: 311978: 241979: 231980: 161981: 211982: 321983: 191984: 281985: 221986: 331987: 241988: 171989: 151990: 231991: 231992: 291993: 391994: 281995: 241996: 241997: 211998: 331999: 27195319591967197419791984198919941999
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 39 in 1993.
Days with 10 mm (0.39 in) or more of precipitation per year at Waterloo
YearDaysDecade average
19532324.5
19542024.5
19562024.5
19572824.5
19582524.5
19593124.5
19602623.8
19612723.8
19622123.8
19662023.8
19672523.8
19702222.2
19712222.2
19722522.2
19732922.2
19741822.2
19751722.2
19761122.2
19773122.2
19782422.2
19792322.2
19801622.7
19812122.7
19823222.7
19831922.7
19842822.7
19852222.7
19863322.7
19872422.7
19881722.7
19891522.7
19902327.1
19912327.1
19922927.1
19933927.1
19942827.1
19952427.1
19962427.1
19972127.1
19983327.1
19992727.1
First to last qualifying date each year at Waterloo For each year, a bar from the first to the last day at Waterloo meeting 10 mm (0.39 in). 1953: 19 February 1953 to 4 December 19531954: 19 February 1954 to 20 October 19541956: 1 February 1956 to 5 November 19561957: 18 March 1957 to 19 November 19571958: 27 February 1958 to 18 November 19581959: 5 March 1959 to 28 December 19591960: 15 January 1960 to 24 September 19601961: 18 February 1961 to 16 November 19611962: 15 February 1962 to 20 October 19621966: 9 February 1966 to 28 December 19661967: 26 March 1967 to 30 October 19671970: 12 April 1970 to 27 October 19701971: 3 January 1971 to 30 December 19711972: 16 April 1972 to 30 December 19721973: 4 January 1973 to 24 December 19731974: 4 April 1974 to 15 December 19741975: 11 January 1975 to 14 December 19751976: 17 February 1976 to 25 September 19761977: 3 March 1977 to 17 December 19771978: 14 March 1978 to 17 November 19781979: 19 January 1979 to 22 November 19791980: 3 April 1980 to 17 October 19801981: 4 April 1981 to 1 December 19811982: 23 January 1982 to 28 December 19821983: 29 January 1983 to 9 November 19831984: 1 January 1984 to 20 December 19841985: 31 March 1985 to 30 November 19851986: 3 February 1986 to 7 November 19861987: 17 March 1987 to 28 December 19871988: 19 January 1988 to 19 December 19881989: 28 January 1989 to 15 October 19891990: 19 January 1990 to 3 October 19901991: 2 March 1991 to 25 December 19911992: 22 January 1992 to 14 December 19921993: 25 February 1993 to 14 December 19931994: 27 January 1994 to 31 December 19941995: 6 January 1995 to 17 November 19951996: 25 March 1996 to 30 November 19961997: 4 February 1997 to 30 November 19971998: 5 January 1998 to 10 November 19981999: 2 January 1999 to 23 November 19991953196019711977198319891995JanFebMarAprMayJunJulAugSepOctNovDec
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
YearFirst dateLast date
19531953-02-191953-12-04
19541954-02-191954-10-20
19561956-02-011956-11-05
19571957-03-181957-11-19
19581958-02-271958-11-18
19591959-03-051959-12-28
19601960-01-151960-09-24
19611961-02-181961-11-16
19621962-02-151962-10-20
19661966-02-091966-12-28
19671967-03-261967-10-30
19701970-04-121970-10-27
19711971-01-031971-12-30
19721972-04-161972-12-30
19731973-01-041973-12-24
19741974-04-041974-12-15
19751975-01-111975-12-14
19761976-02-171976-09-25
19771977-03-031977-12-17
19781978-03-141978-11-17
19791979-01-191979-11-22
19801980-04-031980-10-17
19811981-04-041981-12-01
19821982-01-231982-12-28
19831983-01-291983-11-09
19841984-01-011984-12-20
19851985-03-311985-11-30
19861986-02-031986-11-07
19871987-03-171987-12-28
19881988-01-191988-12-19
19891989-01-281989-10-15
19901990-01-191990-10-03
19911991-03-021991-12-25
19921992-01-221992-12-14
19931993-02-251993-12-14
19941994-01-271994-12-31
19951995-01-061995-11-17
19961996-03-251996-11-30
19971997-02-041997-11-30
19981998-01-051998-11-10
19991999-01-021999-11-23

Every Fixed Threshold

Fixed thresholds at Waterloo
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain4139199327
25 mm (0.98 in): Days with 25 mm or more rain411419779
50 mm (1.97 in): Days with 50 mm or more rain32419823
100 mm (3.94 in): Days with 100 mm or more rain3119591
10 cm (3.9 in): Days with 10 cm or more snowfall35619914
25 cm (9.8 in): Days with 25 cm or more snowfall6119571

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1953.

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 . Last revised (2025-12-31).