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Data as of 2025-12-31
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Built 2026-10-19 (19 October 2026)

Waterloo Threshold Days by Year (USC00338810)

16 fixed thresholds counted per year at Waterloo (USC00338810): 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 44 years, most in 2011 with 59.
  • Waterloo: days with 25 mm (0.98 in) or more of precipitation in 44 years, most in 2011 with 17.
  • Waterloo: days with 50 mm (1.97 in) or more of precipitation in 33 years, most in 2004 with 5.
  • Waterloo: days with a maximum temperature at or above 30 C (86 F) in 23 years, most in 2007 with 89.
  • 16 fixed thresholds have at least one qualifying day at Waterloo.
23 years with a qualifying day
Days at or above 30 C (86 F) per year at Waterloo 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 89 in 2007. 02550751001996: 411997: 351998: 661999: 722000: 382001: 532002: 722003: 322004: 372005: 822006: 482007: 892008: 492009: 332010: 832011: 642013: 492015: 572016: 702017: 522018: 722019: 742020: 6219961999200220052008201120162019
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 89 in 2007.
Days at or above 30 C (86 F) per year at Waterloo
YearDaysDecade average
19964153.5
19973553.5
19986653.5
19997253.5
20003853.3
20015353.3
20027253.3
20033253.3
20043753.3
20058253.3
20064853.3
20078953.3
20084953.3
20093353.3
20108365.1
20116465.1
20134965.1
20155765.1
20167065.1
20175265.1
20187265.1
20197465.1
20206262
First to last qualifying date each year at Waterloo For each year, a bar from the first to the last day at Waterloo meeting 30 C (86 F). 1996: 19 May 1996 to 9 September 19961997: 20 May 1997 to 14 October 19971998: 15 May 1998 to 7 October 19981999: 23 April 1999 to 29 September 19992000: 7 May 2000 to 11 September 20002001: 12 April 2001 to 14 September 20012002: 17 April 2002 to 5 October 20022003: 24 June 2003 to 2 September 20032004: 19 April 2004 to 7 September 20042005: 12 May 2005 to 5 October 20052006: 29 May 2006 to 30 August 20062007: 1 May 2007 to 9 October 20072008: 1 June 2008 to 15 September 20082009: 25 April 2009 to 28 August 20092010: 3 April 2010 to 11 October 20102011: 11 April 2011 to 5 September 20112013: 16 May 2013 to 21 September 20132015: 8 May 2015 to 10 September 20152016: 28 May 2016 to 20 October 20162017: 17 May 2017 to 8 October 20172018: 12 May 2018 to 9 October 20182019: 2 May 2019 to 4 October 20192020: 18 May 2020 to 11 September 202019961999200220052008201120162019JanFebMarAprMayJunJulAugSepOctNovDec
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
YearFirst dateLast date
19961996-05-191996-09-09
19971997-05-201997-10-14
19981998-05-151998-10-07
19991999-04-231999-09-29
20002000-05-072000-09-11
20012001-04-122001-09-14
20022002-04-172002-10-05
20032003-06-242003-09-02
20042004-04-192004-09-07
20052005-05-122005-10-05
20062006-05-292006-08-30
20072007-05-012007-10-09
20082008-06-012008-09-15
20092009-04-252009-08-28
20102010-04-032010-10-11
20112011-04-112011-09-05
20132013-05-162013-09-21
20152015-05-082015-09-10
20162016-05-282016-10-20
20172017-05-172017-10-08
20182018-05-122018-10-09
20192019-05-022019-10-04
20202020-05-182020-09-11

Every Fixed Threshold

Fixed thresholds at Waterloo
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days2389200762
35 C (95 F): Days122019999
90 F (32.2 C): Days2350199931
100 F (37.8 C): Days3219991
0 C (32 F): Ice days (max234220108
0 C (32 F): Frost days (min231442010118
-10 C (14 F): Days with min2334200911
-20 C (-4 F): Days with min9920152
-30 C (-22 F): Days with min2219962
20 C (68 F): Tropical nights (min2325200214
10 mm (0.39 in): Days with 10 mm or more rain4459201147
25 mm (0.98 in): Days with 25 mm or more rain4417201111
50 mm (1.97 in): Days with 50 mm or more rain33520041
100 mm (3.94 in): Days with 100 mm or more rain2119961
10 cm (3.9 in): Days with 10 cm or more snowfall9419961
25 cm (9.8 in): Days with 25 cm or more snowfall1120151

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1996.

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).