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Built 2026-10-19 (19 October 2026)

Rockford Threshold Days by Year (USC00217020)

6 fixed thresholds counted per year at Rockford (USC00217020): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Rockford Thresholds

  • Rockford: days with 10 mm (0.39 in) or more of precipitation in 35 years, most in 2019 with 38.
  • Rockford: days with 25 mm (0.98 in) or more of precipitation in 35 years, most in 1993 with 16.
  • Rockford: days with 10 cm (3.9 in) or more of snowfall in 29 years, most in 2019 with 10.
  • Rockford: days with 50 mm (1.97 in) or more of precipitation in 25 years, most in 2002 with 5.
  • 6 fixed thresholds have at least one qualifying day at Rockford.
35 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Rockford Days per year at Rockford with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 38 in 2019. 0102030401979: 291980: 181981: 241983: 281984: 261985: 361986: 311987: 151990: 281993: 331994: 311995: 301996: 231998: 231999: 202000: 132001: 232002: 342003: 182004: 252005: 292006: 222007: 212008: 202009: 242010: 222011: 212012: 212013: 222014: 252015: 302016: 222017: 232018: 172019: 38197919841990199620012005200920132017
Days per year at Rockford with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 38 in 2019.
Days with 10 mm (0.39 in) or more of precipitation per year at Rockford
YearDaysDecade average
19792929
19801825.4
19812425.4
19832825.4
19842625.4
19853625.4
19863125.4
19871525.4
19902826.9
19933326.9
19943126.9
19953026.9
19962326.9
19982326.9
19992026.9
20001322.9
20012322.9
20023422.9
20031822.9
20042522.9
20052922.9
20062222.9
20072122.9
20082022.9
20092422.9
20102224.1
20112124.1
20122124.1
20132224.1
20142524.1
20153024.1
20162224.1
20172324.1
20181724.1
20193824.1
First to last qualifying date each year at Rockford For each year, a bar from the first to the last day at Rockford meeting 10 mm (0.39 in). 1979: 23 January 1979 to 1 November 19791980: 9 April 1980 to 17 October 19801981: 1 February 1981 to 19 November 19811983: 7 March 1983 to 28 November 19831984: 19 February 1984 to 16 December 19841985: 4 March 1985 to 1 December 19851986: 22 January 1986 to 8 November 19861987: 21 June 1987 to 29 November 19871990: 11 March 1990 to 21 October 19901993: 3 February 1993 to 14 December 19931994: 27 January 1994 to 28 November 19941995: 20 March 1995 to 14 December 19951996: 18 January 1996 to 15 December 19961998: 28 February 1998 to 10 November 19981999: 9 March 1999 to 12 September 19992000: 24 March 2000 to 7 November 20002001: 30 January 2001 to 27 November 20012002: 10 February 2002 to 12 October 20022003: 3 February 2003 to 12 October 20032004: 28 March 2004 to 29 October 20042005: 2 January 2005 to 30 December 20052006: 1 February 2006 to 31 December 20062007: 25 February 2007 to 19 October 20072008: 31 March 2008 to 15 December 20082009: 10 February 2009 to 25 December 20092010: 8 May 2010 to 31 December 20102011: 21 February 2011 to 13 October 20112012: 31 January 2012 to 10 December 20122013: 9 March 2013 to 5 December 20132014: 21 February 2014 to 4 September 20142015: 2 April 2015 to 18 November 20152016: 25 April 2016 to 26 December 20162017: 21 February 2017 to 5 December 20172018: 4 April 2018 to 28 December 20182019: 21 February 2019 to 31 December 20191979198519942000200520102015JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Rockford meeting 10 mm (0.39 in).
First to last qualifying date each year at Rockford
YearFirst dateLast date
19791979-01-231979-11-01
19801980-04-091980-10-17
19811981-02-011981-11-19
19831983-03-071983-11-28
19841984-02-191984-12-16
19851985-03-041985-12-01
19861986-01-221986-11-08
19871987-06-211987-11-29
19901990-03-111990-10-21
19931993-02-031993-12-14
19941994-01-271994-11-28
19951995-03-201995-12-14
19961996-01-181996-12-15
19981998-02-281998-11-10
19991999-03-091999-09-12
20002000-03-242000-11-07
20012001-01-302001-11-27
20022002-02-102002-10-12
20032003-02-032003-10-12
20042004-03-282004-10-29
20052005-01-022005-12-30
20062006-02-012006-12-31
20072007-02-252007-10-19
20082008-03-312008-12-15
20092009-02-102009-12-25
20102010-05-082010-12-31
20112011-02-212011-10-13
20122012-01-312012-12-10
20132013-03-092013-12-05
20142014-02-212014-09-04
20152015-04-022015-11-18
20162016-04-252016-12-26
20172017-02-212017-12-05
20182018-04-042018-12-28
20192019-02-212019-12-31

Every Fixed Threshold

Fixed thresholds at Rockford
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain3538201938
25 mm (0.98 in): Days with 25 mm or more rain351619939
50 mm (1.97 in): Days with 50 mm or more rain25520021
100 mm (3.94 in): Days with 100 mm or more rain4119841
10 cm (3.9 in): Days with 10 cm or more snowfall2910201910
25 cm (9.8 in): Days with 25 cm or more snowfall10219911

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1979.

Download the Data

  • Data for Rockford 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).