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Built 2026-10-19 (19 October 2026)

Glen Helen Threshold Days by Year (ASN00015523)

4 fixed thresholds counted per year at Glen Helen (ASN00015523): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Glen Helen Thresholds

  • Glen Helen: days with 10 mm (0.39 in) or more of precipitation in 47 years, most in 1953 with 18.
  • Glen Helen: days with 25 mm (0.98 in) or more of precipitation in 42 years, most in 1968 with 7.
  • Glen Helen: days with 50 mm (1.97 in) or more of precipitation in 24 years, most in 1944 with 3.
  • Glen Helen: days with 100 mm (3.94 in) or more of precipitation in 6 years, most in 1947 with 1.
  • 4 fixed thresholds have at least one qualifying day at Glen Helen.
47 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Glen Helen Days per year at Glen Helen with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 18 in 1953. 051015201941: 151942: 101943: 61944: 101945: 41947: 101948: 31949: 51950: 141951: 51952: 41953: 181954: 81955: 21958: 41959: 51960: 41961: 11962: 81963: 41964: 31965: 41967: 91968: 161969: 91970: 41971: 21972: 31975: 111976: 91977: 151988: 71989: 31990: 61991: 81992: 51993: 91995: 71996: 31997: 91998: 71999: 102000: 92001: 42002: 22004: 92021: 151941194719521959196419701977199219982004
Days per year at Glen Helen with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 18 in 1953.
Days with 10 mm (0.39 in) or more of precipitation per year at Glen Helen
YearDaysDecade average
1941157.9
1942107.9
194367.9
1944107.9
194547.9
1947107.9
194837.9
194957.9
1950147.5
195157.5
195247.5
1953187.5
195487.5
195527.5
195847.5
195957.5
196046.4
196116.4
196286.4
196346.4
196436.4
196546.4
196796.4
1968166.4
196996.4
197047.3
197127.3
197237.3
1975117.3
197697.3
1977157.3
198875
198935
199067.1
199187.1
199257.1
199397.1
199577.1
199637.1
199797.1
199877.1
1999107.1
200096
200146
200226
200496
20211515
First to last qualifying date each year at Glen Helen For each year, a bar from the first to the last day at Glen Helen meeting 10 mm (0.39 in). 1941: 2 January 1941 to 1 December 19411942: 5 January 1942 to 6 December 19421943: 5 March 1943 to 17 October 19431944: 24 January 1944 to 31 December 19441945: 20 February 1945 to 26 December 19451947: 5 March 1947 to 26 November 19471948: 29 February 1948 to 15 July 19481949: 23 February 1949 to 30 December 19491950: 29 May 1950 to 29 December 19501951: 5 January 1951 to 26 November 19511952: 16 April 1952 to 25 October 19521953: 4 January 1953 to 28 December 19531954: 25 January 1954 to 5 December 19541955: 19 July 1955 to 20 July 19551958: 19 May 1958 to 12 November 19581959: 1 February 1959 to 25 November 19591960: 17 January 1960 to 11 May 19601961: 19 April 1961 to 19 April 19611962: 13 January 1962 to 13 August 19621963: 19 March 1963 to 31 December 19631964: 1 June 1964 to 1 December 19641965: 7 March 1965 to 6 December 19651967: 5 February 1967 to 1 December 19671968: 9 January 1968 to 3 December 19681969: 10 January 1969 to 3 November 19691970: 13 March 1970 to 28 November 19701971: 14 July 1971 to 21 November 19711972: 4 March 1972 to 7 November 19721975: 16 March 1975 to 16 December 19751976: 9 January 1976 to 15 December 19761977: 14 January 1977 to 25 November 19771988: 8 May 1988 to 25 December 19881989: 15 March 1989 to 19 November 19891990: 9 January 1990 to 6 December 19901991: 24 January 1991 to 23 November 19911992: 24 January 1992 to 24 September 19921993: 2 February 1993 to 7 December 19931995: 20 January 1995 to 22 December 19951996: 31 January 1996 to 5 July 19961997: 19 January 1997 to 18 December 19971998: 22 January 1998 to 28 November 19981999: 7 January 1999 to 17 December 19992000: 17 April 2000 to 23 December 20002001: 16 January 2001 to 27 December 20012002: 12 January 2002 to 27 February 20022004: 30 January 2004 to 23 December 20042021: 25 January 2021 to 23 November 202119411948195419621969197719932000JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Glen Helen meeting 10 mm (0.39 in).
First to last qualifying date each year at Glen Helen
YearFirst dateLast date
19411941-01-021941-12-01
19421942-01-051942-12-06
19431943-03-051943-10-17
19441944-01-241944-12-31
19451945-02-201945-12-26
19471947-03-051947-11-26
19481948-02-291948-07-15
19491949-02-231949-12-30
19501950-05-291950-12-29
19511951-01-051951-11-26
19521952-04-161952-10-25
19531953-01-041953-12-28
19541954-01-251954-12-05
19551955-07-191955-07-20
19581958-05-191958-11-12
19591959-02-011959-11-25
19601960-01-171960-05-11
19611961-04-191961-04-19
19621962-01-131962-08-13
19631963-03-191963-12-31
19641964-06-011964-12-01
19651965-03-071965-12-06
19671967-02-051967-12-01
19681968-01-091968-12-03
19691969-01-101969-11-03
19701970-03-131970-11-28
19711971-07-141971-11-21
19721972-03-041972-11-07
19751975-03-161975-12-16
19761976-01-091976-12-15
19771977-01-141977-11-25
19881988-05-081988-12-25
19891989-03-151989-11-19
19901990-01-091990-12-06
19911991-01-241991-11-23
19921992-01-241992-09-24
19931993-02-021993-12-07
19951995-01-201995-12-22
19961996-01-311996-07-05
19971997-01-191997-12-18
19981998-01-221998-11-28
19991999-01-071999-12-17
20002000-04-172000-12-23
20012001-01-162001-12-27
20022002-01-122002-02-27
20042004-01-302004-12-23
20212021-01-252021-11-23

Every Fixed Threshold

Fixed thresholds at Glen Helen
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain4718195315
25 mm (0.98 in): Days with 25 mm or more rain42719685
50 mm (1.97 in): Days with 50 mm or more rain24319442
100 mm (3.94 in): Days with 100 mm or more rain6119471

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1941.

Download the Data

  • Data for Glen Helen 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).