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Built 2026-10-19 (19 October 2026)

Romeoville WFO Threshold Days by Year (USC00117457)

17 fixed thresholds counted per year at Romeoville WFO (USC00117457): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Romeoville WFO Thresholds

  • Romeoville WFO: days with a maximum temperature at or above 30 C (86 F) in 28 years, most in 2005 with 64.
  • Romeoville WFO: days with a maximum temperature at or above 90 F (32.2 C) in 28 years, most in 2012 with 43.
  • Romeoville WFO: days with a maximum temperature at or below 0 C (32 F) in 28 years, most in 2014 with 72.
  • Romeoville WFO: nights with a minimum temperature at or below 0 C (32 F) in 28 years, most in 2013 with 148.
  • 17 fixed thresholds have at least one qualifying day at Romeoville WFO.
28 years with a qualifying day
Days at or above 30 C (86 F) per year at Romeoville WFO Days per year at Romeoville WFO with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 64 in 2005. 0204060801998: 391999: 442000: 242001: 492002: 522003: 232004: 172005: 642006: 292007: 522008: 262009: 162010: 472011: 502012: 622013: 342014: 172015: 232016: 432017: 362018: 532019: 342020: 502021: 522022: 362023: 332024: 452025: 461998200120042007201020132016201920222025
Days per year at Romeoville WFO with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 64 in 2005.
Days at or above 30 C (86 F) per year at Romeoville WFO
YearDaysDecade average
19983941.5
19994441.5
20002435.2
20014935.2
20025235.2
20032335.2
20041735.2
20056435.2
20062935.2
20075235.2
20082635.2
20091635.2
20104739.9
20115039.9
20126239.9
20133439.9
20141739.9
20152339.9
20164339.9
20173639.9
20185339.9
20193439.9
20205043.7
20215243.7
20223643.7
20233343.7
20244543.7
20254643.7
First to last qualifying date each year at Romeoville WFO For each year, a bar from the first to the last day at Romeoville WFO meeting 30 C (86 F). 1998: 14 May 1998 to 27 September 19981999: 28 May 1999 to 26 September 19992000: 6 May 2000 to 19 September 20002001: 30 April 2001 to 7 September 20012002: 15 April 2002 to 30 September 20022003: 15 April 2003 to 28 August 20032004: 18 April 2004 to 14 September 20042005: 8 May 2005 to 4 October 20052006: 27 May 2006 to 23 August 20062007: 14 May 2007 to 8 October 20072008: 2 June 2008 to 2 September 20082009: 19 June 2009 to 16 August 20092010: 23 May 2010 to 9 October 20102011: 10 May 2011 to 3 September 20112012: 19 May 2012 to 12 September 20122013: 14 May 2013 to 19 September 20132014: 8 May 2014 to 5 September 20142015: 10 June 2015 to 7 September 20152016: 24 May 2016 to 19 September 20162017: 16 May 2017 to 26 September 20172018: 2 May 2018 to 3 October 20182019: 26 June 2019 to 1 October 20192020: 24 May 2020 to 3 September 20202021: 27 April 2021 to 1 October 20212022: 10 May 2022 to 21 September 20222023: 7 May 2023 to 5 September 20232024: 21 May 2024 to 21 September 20242025: 15 May 2025 to 4 October 20251998200220062010201420182022JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Romeoville WFO meeting 30 C (86 F).
First to last qualifying date each year at Romeoville WFO
YearFirst dateLast date
19981998-05-141998-09-27
19991999-05-281999-09-26
20002000-05-062000-09-19
20012001-04-302001-09-07
20022002-04-152002-09-30
20032003-04-152003-08-28
20042004-04-182004-09-14
20052005-05-082005-10-04
20062006-05-272006-08-23
20072007-05-142007-10-08
20082008-06-022008-09-02
20092009-06-192009-08-16
20102010-05-232010-10-09
20112011-05-102011-09-03
20122012-05-192012-09-12
20132013-05-142013-09-19
20142014-05-082014-09-05
20152015-06-102015-09-07
20162016-05-242016-09-19
20172017-05-162017-09-26
20182018-05-022018-10-03
20192019-06-262019-10-01
20202020-05-242020-09-03
20212021-04-272021-10-01
20222022-05-102022-09-21
20232023-05-072023-09-05
20242024-05-212024-09-21
20252025-05-152025-10-04

Every Fixed Threshold

Fixed thresholds at Romeoville WFO
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days2864200546
35 C (95 F): Days161320121
90 F (32.2 C): Days2843201222
100 F (37.8 C): Days3320123
0 C (32 F): Ice days (max2872201454
0 C (32 F): Frost days (min281482013117
-10 C (14 F): Days with min2858201438
-20 C (-4 F): Days with min251920142
-30 C (-22 F): Days with min3220192
20 C (68 F): Tropical nights (min2838201232
25 C (77 F): Days with min7320111
10 mm (0.39 in): Days with 10 mm or more rain2845201922
25 mm (0.98 in): Days with 25 mm or more rain281620097
50 mm (1.97 in): Days with 50 mm or more rain25520082
100 mm (3.94 in): Days with 100 mm or more rain4120031
10 cm (3.9 in): Days with 10 cm or more snowfall24620001
25 cm (9.8 in): Days with 25 cm or more snowfall4119991

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1998.

Download the Data

  • Data for Romeoville WFO 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).