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Built 2026-10-19 (19 October 2026)

Rock Valley Threshold Days by Year (USC00137152)

6 fixed thresholds counted per year at Rock Valley (USC00137152): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Rock Valley Thresholds

  • Rock Valley: days with 10 mm (0.39 in) or more of precipitation in 47 years, most in 2019 with 37.
  • Rock Valley: days with 25 mm (0.98 in) or more of precipitation in 47 years, most in 2018 with 13.
  • Rock Valley: days with 50 mm (1.97 in) or more of precipitation in 37 years, most in 2018 with 6.
  • Rock Valley: days with 10 cm (3.9 in) or more of snowfall in 36 years, most in 1985 with 6.
  • 6 fixed thresholds have at least one qualifying day at Rock Valley.
47 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Rock Valley Days per year at Rock Valley with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 37 in 2019. 0102030401979: 271980: 151981: 211982: 251983: 291984: 271985: 231986: 241987: 181988: 151989: 121990: 191991: 191992: 261993: 331994: 191995: 221996: 241997: 191998: 221999: 162000: 202001: 262002: 182003: 212004: 272005: 242006: 202007: 252008: 212009: 292010: 282012: 192013: 202014: 232015: 252016: 332017: 222018: 332019: 372020: 162021: 242022: 122023: 182024: 222025: 252026: 131979198419891994199920042009201520202025
Days per year at Rock Valley with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 37 in 2019.
Days with 10 mm (0.39 in) or more of precipitation per year at Rock Valley
YearDaysDecade average
19792727
19801520.9
19812120.9
19822520.9
19832920.9
19842720.9
19852320.9
19862420.9
19871820.9
19881520.9
19891220.9
19901921.9
19911921.9
19922621.9
19933321.9
19941921.9
19952221.9
19962421.9
19971921.9
19982221.9
19991621.9
20002023.1
20012623.1
20021823.1
20032123.1
20042723.1
20052423.1
20062023.1
20072523.1
20082123.1
20092923.1
20102826.7
20121926.7
20132026.7
20142326.7
20152526.7
20163326.7
20172226.7
20183326.7
20193726.7
20201618.6
20212418.6
20221218.6
20231818.6
20242218.6
20252518.6
20261318.6
First to last qualifying date each year at Rock Valley For each year, a bar from the first to the last day at Rock Valley meeting 10 mm (0.39 in). 1979: 4 March 1979 to 22 November 19791980: 17 May 1980 to 16 October 19801981: 27 February 1981 to 1 December 19811982: 21 January 1982 to 28 December 19821983: 9 January 1983 to 28 November 19831984: 19 February 1984 to 15 December 19841985: 3 March 1985 to 29 September 19851986: 11 March 1986 to 9 November 19861987: 17 March 1987 to 28 December 19871988: 19 January 1988 to 29 September 19881989: 28 April 1989 to 9 September 19891990: 14 March 1990 to 21 October 19901991: 12 April 1991 to 30 November 19911992: 24 February 1992 to 20 November 19921993: 31 March 1993 to 14 December 19931994: 12 April 1994 to 28 November 19941995: 18 March 1995 to 2 November 19951996: 18 January 1996 to 15 December 19961997: 16 January 1997 to 12 October 19971998: 28 March 1998 to 10 November 19981999: 6 April 1999 to 4 September 19992000: 19 January 2000 to 7 November 20002001: 14 January 2001 to 27 November 20012002: 10 February 2002 to 4 October 20022003: 15 February 2003 to 13 October 20032004: 29 January 2004 to 18 November 20042005: 12 February 2005 to 13 December 20052006: 12 March 2006 to 31 December 20062007: 15 January 2007 to 2 December 20072008: 31 March 2008 to 23 October 20082009: 10 February 2009 to 26 December 20092010: 7 April 2010 to 13 November 20102012: 24 February 2012 to 15 December 20122013: 28 January 2013 to 6 November 20132014: 4 April 2014 to 23 December 20142015: 1 February 2015 to 29 December 20152016: 3 February 2016 to 26 December 20162017: 25 January 2017 to 7 October 20172018: 23 January 2018 to 28 December 20182019: 20 February 2019 to 29 December 20192020: 18 January 2020 to 11 November 20202021: 15 March 2021 to 16 December 20212022: 22 March 2022 to 13 December 20222023: 3 January 2023 to 25 December 20232024: 9 January 2024 to 31 December 20242025: 5 March 2025 to 7 December 20252026: 2 April 2026 to 2 September 202619791985199119972003200920162022JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Rock Valley meeting 10 mm (0.39 in).
First to last qualifying date each year at Rock Valley
YearFirst dateLast date
19791979-03-041979-11-22
19801980-05-171980-10-16
19811981-02-271981-12-01
19821982-01-211982-12-28
19831983-01-091983-11-28
19841984-02-191984-12-15
19851985-03-031985-09-29
19861986-03-111986-11-09
19871987-03-171987-12-28
19881988-01-191988-09-29
19891989-04-281989-09-09
19901990-03-141990-10-21
19911991-04-121991-11-30
19921992-02-241992-11-20
19931993-03-311993-12-14
19941994-04-121994-11-28
19951995-03-181995-11-02
19961996-01-181996-12-15
19971997-01-161997-10-12
19981998-03-281998-11-10
19991999-04-061999-09-04
20002000-01-192000-11-07
20012001-01-142001-11-27
20022002-02-102002-10-04
20032003-02-152003-10-13
20042004-01-292004-11-18
20052005-02-122005-12-13
20062006-03-122006-12-31
20072007-01-152007-12-02
20082008-03-312008-10-23
20092009-02-102009-12-26
20102010-04-072010-11-13
20122012-02-242012-12-15
20132013-01-282013-11-06
20142014-04-042014-12-23
20152015-02-012015-12-29
20162016-02-032016-12-26
20172017-01-252017-10-07
20182018-01-232018-12-28
20192019-02-202019-12-29
20202020-01-182020-11-11
20212021-03-152021-12-16
20222022-03-222022-12-13
20232023-01-032023-12-25
20242024-01-092024-12-31
20252025-03-052025-12-07
20262026-04-022026-09-02

Every Fixed Threshold

Fixed thresholds at Rock Valley
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain4737201913
25 mm (0.98 in): Days with 25 mm or more rain471320185
50 mm (1.97 in): Days with 50 mm or more rain37620181
100 mm (3.94 in): Days with 100 mm or more rain6220182
10 cm (3.9 in): Days with 10 cm or more snowfall36619852
25 cm (9.8 in): Days with 25 cm or more snowfall8119831

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 Rock Valley 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 (2026-10-12).