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

Deer Valley Threshold Days by Year (USC00022462)

13 fixed thresholds counted per year at Deer Valley (USC00022462): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Deer Valley Thresholds

  • Deer Valley: days with 10 mm (0.39 in) or more of precipitation in 33 years, most in 1978 with 16.
  • Deer Valley: days with a maximum temperature at or above 30 C (86 F) in 32 years, most in 1966 with 200.
  • Deer Valley: days with a maximum temperature at or above 35 C (95 F) in 32 years, most in 1978 with 146.
  • Deer Valley: days with a maximum temperature at or above 40 C (104 F) in 32 years, most in 1969 with 85.
  • 13 fixed thresholds have at least one qualifying day at Deer Valley.
32 years with a qualifying day
Days at or above 30 C (86 F) per year at Deer Valley Days per year at Deer Valley with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 200 in 1966. 0501001502001950: 1981951: 1611952: 1901955: 1511956: 1781957: 1651958: 1901959: 1691960: 1821961: 1791962: 1961963: 1971964: 1811965: 1811966: 2001967: 1881968: 1801969: 1831971: 1781972: 2001973: 1851974: 1911975: 1691976: 1811977: 1851978: 1731979: 1821980: 1821981: 1911982: 1721983: 1631984: 14319501956196019641968197319771981
Days per year at Deer Valley with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 200 in 1966.
Days at or above 30 C (86 F) per year at Deer Valley
YearDaysDecade average
1950198175.3
1951161175.3
1952190175.3
1955151175.3
1956178175.3
1957165175.3
1958190175.3
1959169175.3
1960182186.7
1961179186.7
1962196186.7
1963197186.7
1964181186.7
1965181186.7
1966200186.7
1967188186.7
1968180186.7
1969183186.7
1971178182.7
1972200182.7
1973185182.7
1974191182.7
1975169182.7
1976181182.7
1977185182.7
1978173182.7
1979182182.7
1980182170.2
1981191170.2
1982172170.2
1983163170.2
1984143170.2
First to last qualifying date each year at Deer Valley For each year, a bar from the first to the last day at Deer Valley meeting 30 C (86 F). 1950: 29 March 1950 to 10 December 19501951: 10 February 1951 to 24 October 19511952: 2 April 1952 to 31 October 19521955: 9 March 1955 to 5 November 19551956: 18 March 1956 to 11 November 19561957: 14 February 1957 to 11 October 19571958: 2 April 1958 to 12 November 19581959: 1 May 1959 to 29 October 19591960: 20 March 1960 to 4 November 19601961: 23 March 1961 to 27 October 19611962: 27 March 1962 to 14 November 19621963: 5 February 1963 to 12 November 19631964: 30 March 1964 to 30 October 19641965: 1 April 1965 to 7 November 19651966: 12 March 1966 to 1 November 19661967: 16 March 1967 to 15 November 19671968: 27 March 1968 to 29 October 19681969: 21 March 1969 to 28 October 19691971: 19 January 1971 to 11 November 19711972: 28 February 1972 to 17 October 19721973: 11 April 1973 to 11 November 19731974: 15 March 1974 to 25 October 19741975: 21 April 1975 to 6 November 19751976: 22 March 1976 to 8 November 19761977: 19 February 1977 to 14 November 19771978: 26 March 1978 to 8 November 19781979: 14 April 1979 to 27 October 19791980: 8 April 1980 to 16 December 19801981: 19 February 1981 to 5 November 19811982: 22 February 1982 to 27 October 19821983: 31 March 1983 to 1 November 19831984: 13 March 1984 to 5 November 198419501956196019641968197319771981JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Deer Valley meeting 30 C (86 F).
First to last qualifying date each year at Deer Valley
YearFirst dateLast date
19501950-03-291950-12-10
19511951-02-101951-10-24
19521952-04-021952-10-31
19551955-03-091955-11-05
19561956-03-181956-11-11
19571957-02-141957-10-11
19581958-04-021958-11-12
19591959-05-011959-10-29
19601960-03-201960-11-04
19611961-03-231961-10-27
19621962-03-271962-11-14
19631963-02-051963-11-12
19641964-03-301964-10-30
19651965-04-011965-11-07
19661966-03-121966-11-01
19671967-03-161967-11-15
19681968-03-271968-10-29
19691969-03-211969-10-28
19711971-01-191971-11-11
19721972-02-281972-10-17
19731973-04-111973-11-11
19741974-03-151974-10-25
19751975-04-211975-11-06
19761976-03-221976-11-08
19771977-02-191977-11-14
19781978-03-261978-11-08
19791979-04-141979-10-27
19801980-04-081980-12-16
19811981-02-191981-11-05
19821982-02-221982-10-27
19831983-03-311983-11-01
19841984-03-131984-11-05

Every Fixed Threshold

Fixed thresholds at Deer Valley
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days322001966143
35 C (95 F): Days321461978100
40 C (104 F): Days3285196931
45 C (113 F): Days20919691
90 F (32.2 C): Days321811963126
100 F (37.8 C): Days32119196969
110 F (43.3 C): Days323019694
0 C (32 F): Frost days (min2845195610
20 C (68 F): Tropical nights (min28115198184
25 C (77 F): Days with min2863198141
10 mm (0.39 in): Days with 10 mm or more rain3316197813
25 mm (0.98 in): Days with 25 mm or more rain23619515
50 mm (1.97 in): Days with 50 mm or more rain3119661

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1950.

Download the Data

  • Data for Deer 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 (2025-12-31).