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Built 2026-10-17 (17 October 2026)

Arizona Threshold Days by Year

4 fixed thresholds counted per year at Arizona (ASN00029002): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Arizona Thresholds

  • Arizona: days with 10 mm (0.39 in) or more of precipitation in 47 years, most in 1981 with 30.
  • Arizona: days with 25 mm (0.98 in) or more of precipitation in 44 years, most in 2000 with 14.
  • Arizona: days with 50 mm (1.97 in) or more of precipitation in 35 years, most in 1984 with 6.
  • Arizona: days with 100 mm (3.94 in) or more of precipitation in 15 years, most in 1969 with 2.
  • 4 fixed thresholds have at least one qualifying day at Arizona.
47 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Arizona Days per year at Arizona with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 30 in 1981. 01020301948: 91950: 221951: 111952: 61953: 111954: 171956: 221957: 241958: 121959: 141960: 161961: 121962: 161963: 91969: 101970: 151971: 151972: 151975: 191976: 201977: 181980: 141981: 301982: 131983: 151984: 141985: 101986: 81987: 131988: 91989: 121990: 11991: 201992: 151993: 141994: 71995: 151996: 151997: 211998: 241999: 182000: 242001: 182002: 132003: 132004: 152005: 61948195419601970197719841989199419992004
Days per year at Arizona with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 30 in 1981.
Days with 10 mm (0.39 in) or more of precipitation per year at Arizona
YearDaysDecade average
194899
19502215.4
19511115.4
1952615.4
19531115.4
19541715.4
19562215.4
19572415.4
19581215.4
19591415.4
19601612.6
19611212.6
19621612.6
1963912.6
19691012.6
19701517
19711517
19721517
19751917
19762017
19771817
19801413.8
19813013.8
19821313.8
19831513.8
19841413.8
19851013.8
1986813.8
19871313.8
1988913.8
19891213.8
1990115
19912015
19921515
19931415
1994715
19951515
19961515
19972115
19982415
19991815
20002414.8
20011814.8
20021314.8
20031314.8
20041514.8
2005614.8
First to last qualifying date each year at Arizona For each year, a bar from the first to the last day at Arizona meeting 10 mm (0.39 in). 1948: 2 January 1948 to 27 December 19481950: 16 January 1950 to 31 December 19501951: 9 January 1951 to 28 December 19511952: 22 January 1952 to 25 November 19521953: 3 January 1953 to 14 February 19531954: 18 January 1954 to 11 December 19541956: 14 January 1956 to 21 December 19561957: 5 January 1957 to 26 November 19571958: 2 January 1958 to 16 December 19581959: 9 January 1959 to 19 December 19591960: 19 January 1960 to 29 December 19601961: 2 January 1961 to 13 December 19611962: 7 January 1962 to 30 December 19621963: 14 January 1963 to 17 December 19631969: 9 January 1969 to 24 December 19691970: 31 January 1970 to 20 December 19701971: 15 January 1971 to 10 December 19711972: 8 January 1972 to 27 October 19721975: 1 January 1975 to 28 December 19751976: 1 January 1976 to 29 December 19761977: 17 January 1977 to 20 December 19771980: 4 January 1980 to 26 December 19801981: 3 January 1981 to 18 December 19811982: 8 January 1982 to 17 December 19821983: 1 January 1983 to 30 December 19831984: 5 January 1984 to 16 December 19841985: 5 February 1985 to 28 December 19851986: 2 January 1986 to 12 November 19861987: 9 January 1987 to 29 December 19871988: 31 March 1988 to 26 December 19881989: 1 February 1989 to 14 December 19891990: 22 May 1990 to 22 May 19901991: 8 January 1991 to 10 December 19911992: 2 February 1992 to 17 December 19921993: 4 January 1993 to 17 December 19931994: 15 January 1994 to 24 December 19941995: 7 January 1995 to 29 December 19951996: 1 January 1996 to 18 December 19961997: 19 January 1997 to 28 December 19971998: 4 January 1998 to 31 December 19981999: 3 January 1999 to 17 December 19992000: 21 January 2000 to 28 December 20002001: 21 January 2001 to 16 December 20012002: 1 January 2002 to 28 February 20022003: 18 January 2003 to 30 December 20032004: 8 January 2004 to 25 December 20042005: 7 January 2005 to 16 December 200519481956196219751983198919952001JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Arizona meeting 10 mm (0.39 in).
First to last qualifying date each year at Arizona
YearFirst dateLast date
19481948-01-021948-12-27
19501950-01-161950-12-31
19511951-01-091951-12-28
19521952-01-221952-11-25
19531953-01-031953-02-14
19541954-01-181954-12-11
19561956-01-141956-12-21
19571957-01-051957-11-26
19581958-01-021958-12-16
19591959-01-091959-12-19
19601960-01-191960-12-29
19611961-01-021961-12-13
19621962-01-071962-12-30
19631963-01-141963-12-17
19691969-01-091969-12-24
19701970-01-311970-12-20
19711971-01-151971-12-10
19721972-01-081972-10-27
19751975-01-011975-12-28
19761976-01-011976-12-29
19771977-01-171977-12-20
19801980-01-041980-12-26
19811981-01-031981-12-18
19821982-01-081982-12-17
19831983-01-011983-12-30
19841984-01-051984-12-16
19851985-02-051985-12-28
19861986-01-021986-11-12
19871987-01-091987-12-29
19881988-03-311988-12-26
19891989-02-011989-12-14
19901990-05-221990-05-22
19911991-01-081991-12-10
19921992-02-021992-12-17
19931993-01-041993-12-17
19941994-01-151994-12-24
19951995-01-071995-12-29
19961996-01-011996-12-18
19971997-01-191997-12-28
19981998-01-041998-12-31
19991999-01-031999-12-17
20002000-01-212000-12-28
20012001-01-212001-12-16
20022002-01-012002-02-28
20032003-01-182003-12-30
20042004-01-082004-12-25
20052005-01-072005-12-16

Every Fixed Threshold

Fixed thresholds at Arizona
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain473019816
25 mm (0.98 in): Days with 25 mm or more rain441420006
50 mm (1.97 in): Days with 50 mm or more rain35619842
100 mm (3.94 in): Days with 100 mm or more rain15219691

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1948.

Download the Data

  • Data for Arizona 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 2026-10-15 (15 October 2026). Threshold counts are computed by this site.

Data as of . Last revised (2025-12-31).