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Data as of 2025-12-31
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Built 2026-10-19 (19 October 2026)

Ajo Well Threshold Days by Year (USC00020088)

3 fixed thresholds counted per year at Ajo Well (USC00020088): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Ajo Well Thresholds

  • Ajo Well: days with 10 mm (0.39 in) or more of precipitation in 34 years, most in 1958 with 11.
  • Ajo Well: days with 25 mm (0.98 in) or more of precipitation in 24 years, most in 1974 with 4.
  • Ajo Well: days with 50 mm (1.97 in) or more of precipitation in 7 years, most in 1943 with 1.
  • 3 fixed thresholds have at least one qualifying day at Ajo Well.
34 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Ajo Well Days per year at Ajo Well with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 11 in 1958. 0510151941: 91942: 31943: 71944: 61945: 81946: 91947: 61948: 61949: 91950: 21951: 61952: 71953: 81954: 41955: 71956: 11957: 71958: 111959: 91960: 61961: 61962: 81963: 61964: 71965: 71966: 51967: 101968: 91969: 81970: 71971: 41972: 81973: 61974: 6194119451949195319571961196519691973
Days per year at Ajo Well with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 11 in 1958.
Days with 10 mm (0.39 in) or more of precipitation per year at Ajo Well
YearDaysDecade average
194197
194237
194377
194467
194587
194697
194767
194867
194997
195026.2
195166.2
195276.2
195386.2
195446.2
195576.2
195616.2
195776.2
1958116.2
195996.2
196067.2
196167.2
196287.2
196367.2
196477.2
196577.2
196657.2
1967107.2
196897.2
196987.2
197076.2
197146.2
197286.2
197366.2
197466.2
First to last qualifying date each year at Ajo Well For each year, a bar from the first to the last day at Ajo Well meeting 10 mm (0.39 in). 1941: 7 February 1941 to 11 December 19411942: 23 April 1942 to 18 August 19421943: 30 July 1943 to 22 December 19431944: 7 February 1944 to 13 November 19441945: 1 March 1945 to 26 August 19451946: 4 January 1946 to 15 November 19461947: 21 July 1947 to 17 November 19471948: 18 March 1948 to 18 October 19481949: 10 January 1949 to 10 December 19491950: 7 July 1950 to 8 July 19501951: 30 January 1951 to 28 August 19511952: 9 March 1952 to 18 December 19521953: 24 February 1953 to 29 October 19531954: 23 March 1954 to 12 September 19541955: 8 January 1955 to 4 October 19551956: 14 July 1956 to 14 July 19561957: 28 January 1957 to 31 October 19571958: 5 February 1958 to 5 October 19581959: 9 February 1959 to 25 December 19591960: 13 January 1960 to 3 October 19601961: 23 July 1961 to 31 August 19611962: 22 January 1962 to 18 December 19621963: 18 March 1963 to 19 October 19631964: 1 March 1964 to 18 December 19641965: 7 February 1965 to 22 December 19651966: 18 January 1966 to 14 September 19661967: 14 July 1967 to 20 December 19671968: 10 February 1968 to 15 November 19681969: 15 August 1969 to 17 November 19691970: 2 March 1970 to 6 September 19701971: 8 August 1971 to 30 September 19711972: 31 May 1972 to 28 December 19721973: 22 February 1973 to 19 November 19731974: 7 July 1974 to 23 October 19741941194619511956196119661971JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Ajo Well meeting 10 mm (0.39 in).
First to last qualifying date each year at Ajo Well
YearFirst dateLast date
19411941-02-071941-12-11
19421942-04-231942-08-18
19431943-07-301943-12-22
19441944-02-071944-11-13
19451945-03-011945-08-26
19461946-01-041946-11-15
19471947-07-211947-11-17
19481948-03-181948-10-18
19491949-01-101949-12-10
19501950-07-071950-07-08
19511951-01-301951-08-28
19521952-03-091952-12-18
19531953-02-241953-10-29
19541954-03-231954-09-12
19551955-01-081955-10-04
19561956-07-141956-07-14
19571957-01-281957-10-31
19581958-02-051958-10-05
19591959-02-091959-12-25
19601960-01-131960-10-03
19611961-07-231961-08-31
19621962-01-221962-12-18
19631963-03-181963-10-19
19641964-03-011964-12-18
19651965-02-071965-12-22
19661966-01-181966-09-14
19671967-07-141967-12-20
19681968-02-101968-11-15
19691969-08-151969-11-17
19701970-03-021970-09-06
19711971-08-081971-09-30
19721972-05-311972-12-28
19731973-02-221973-11-19
19741974-07-071974-10-23

Every Fixed Threshold

Fixed thresholds at Ajo Well
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain341119586
25 mm (0.98 in): Days with 25 mm or more rain24419744
50 mm (1.97 in): Days with 50 mm or more rain7119431

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 Ajo Well 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).