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Built 2026-10-19 (19 October 2026)

Mount Helena Threshold Days by Year (ASN00009202)

4 fixed thresholds counted per year at Mount Helena (ASN00009202): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Mount Helena Thresholds

  • Mount Helena: days with 10 mm (0.39 in) or more of precipitation in 33 years, most in 1996 with 44.
  • Mount Helena: days with 25 mm (0.98 in) or more of precipitation in 33 years, most in 1999 with 15.
  • Mount Helena: days with 50 mm (1.97 in) or more of precipitation in 16 years, most in 1988 with 3.
  • Mount Helena: days with 100 mm (3.94 in) or more of precipitation in 1 years, most in 1990 with 1.
  • 4 fixed thresholds have at least one qualifying day at Mount Helena.
33 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Mount Helena Days per year at Mount Helena with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 44 in 1996. 02040601987: 271988: 401989: 201990: 321991: 381992: 351993: 281994: 211995: 351996: 441997: 261998: 261999: 342000: 332001: 232002: 322003: 342004: 292005: 372006: 342007: 372008: 312009: 312010: 172011: 332012: 292013: 342014: 252015: 212016: 372017: 332018: 302019: 21198719911995199920032007201120152019
Days per year at Mount Helena with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 44 in 1996.
Days with 10 mm (0.39 in) or more of precipitation per year at Mount Helena
YearDaysDecade average
19872729
19884029
19892029
19903231.9
19913831.9
19923531.9
19932831.9
19942131.9
19953531.9
19964431.9
19972631.9
19982631.9
19993431.9
20003332.1
20012332.1
20023232.1
20033432.1
20042932.1
20053732.1
20063432.1
20073732.1
20083132.1
20093132.1
20101728
20113328
20122928
20133428
20142528
20152128
20163728
20173328
20183028
20192128
First to last qualifying date each year at Mount Helena For each year, a bar from the first to the last day at Mount Helena meeting 10 mm (0.39 in). 1987: 8 April 1987 to 24 December 19871988: 28 April 1988 to 7 November 19881989: 25 February 1989 to 18 October 19891990: 29 January 1990 to 30 October 19901991: 10 April 1991 to 26 December 19911992: 9 February 1992 to 20 November 19921993: 7 February 1993 to 27 October 19931994: 23 May 1994 to 11 September 19941995: 10 May 1995 to 8 November 19951996: 8 May 1996 to 1 December 19961997: 30 March 1997 to 10 October 19971998: 10 March 1998 to 17 October 19981999: 5 January 1999 to 13 December 19992000: 7 January 2000 to 27 November 20002001: 6 May 2001 to 22 October 20012002: 17 April 2002 to 1 November 20022003: 30 March 2003 to 18 November 20032004: 2 March 2004 to 12 October 20042005: 28 March 2005 to 5 November 20052006: 3 January 2006 to 12 October 20062007: 3 January 2007 to 27 October 20072008: 7 February 2008 to 23 November 20082009: 19 April 2009 to 19 November 20092010: 23 March 2010 to 20 December 20102011: 4 January 2011 to 13 December 20112012: 20 January 2012 to 29 November 20122013: 7 January 2013 to 30 November 20132014: 27 April 2014 to 27 November 20142015: 2 February 2015 to 2 November 20152016: 20 January 2016 to 17 November 20162017: 30 January 2017 to 19 December 20172018: 16 January 2018 to 14 October 20182019: 16 April 2019 to 2 November 20191987199219972002200720122017JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Mount Helena meeting 10 mm (0.39 in).
First to last qualifying date each year at Mount Helena
YearFirst dateLast date
19871987-04-081987-12-24
19881988-04-281988-11-07
19891989-02-251989-10-18
19901990-01-291990-10-30
19911991-04-101991-12-26
19921992-02-091992-11-20
19931993-02-071993-10-27
19941994-05-231994-09-11
19951995-05-101995-11-08
19961996-05-081996-12-01
19971997-03-301997-10-10
19981998-03-101998-10-17
19991999-01-051999-12-13
20002000-01-072000-11-27
20012001-05-062001-10-22
20022002-04-172002-11-01
20032003-03-302003-11-18
20042004-03-022004-10-12
20052005-03-282005-11-05
20062006-01-032006-10-12
20072007-01-032007-10-27
20082008-02-072008-11-23
20092009-04-192009-11-19
20102010-03-232010-12-20
20112011-01-042011-12-13
20122012-01-202012-11-29
20132013-01-072013-11-30
20142014-04-272014-11-27
20152015-02-022015-11-02
20162016-01-202016-11-17
20172017-01-302017-12-19
20182018-01-162018-10-14
20192019-04-162019-11-02

Every Fixed Threshold

Fixed thresholds at Mount Helena
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain3344199621
25 mm (0.98 in): Days with 25 mm or more rain3315199912
50 mm (1.97 in): Days with 50 mm or more rain16319882
100 mm (3.94 in): Days with 100 mm or more rain1119901

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1987.

Download the Data

  • Data for Mount Helena 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).