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Data as of 2025-12-31
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Built 2026-10-15 (15 October 2026)

Sun Valley Threshold Days by Year

15 fixed thresholds counted per year at Sun Valley (USC00108906): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Sun Valley Thresholds

  • Sun Valley: days with a maximum temperature at or above 30 C (86 F) in 35 years, most in 1961 with 43.
  • Sun Valley: days with a maximum temperature at or below 0 C (32 F) in 35 years, most in 1952 with 80.
  • Sun Valley: days with 10 mm (0.39 in) or more of precipitation in 35 years, most in 1938 with 23.
  • Sun Valley: nights with a minimum temperature at or below 0 C (32 F) in 34 years, most in 1942 with 326.
  • 15 fixed thresholds have at least one qualifying day at Sun Valley.
35 years with a qualifying day
Days at or above 30 C (86 F) per year at Sun Valley Days per year at Sun Valley with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 43 in 1961. 02040601938: 61939: 301940: 281941: 91942: 241943: 231944: 81945: 141946: 241947: 231948: 161949: 161950: 151951: 171952: 111953: 291954: 191955: 321956: 171957: 131958: 141959: 301960: 281961: 431962: 71963: 111964: 151965: 111966: 331967: 301968: 211969: 341970: 341971: 351972: 20193819421946195019541958196219661970
Days per year at Sun Valley with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 43 in 1961.
Days at or above 30 C (86 F) per year at Sun Valley
YearDaysDecade average
1938618
19393018
19402818.5
1941918.5
19422418.5
19432318.5
1944818.5
19451418.5
19462418.5
19472318.5
19481618.5
19491618.5
19501519.7
19511719.7
19521119.7
19532919.7
19541919.7
19553219.7
19561719.7
19571319.7
19581419.7
19593019.7
19602823.3
19614323.3
1962723.3
19631123.3
19641523.3
19651123.3
19663323.3
19673023.3
19682123.3
19693423.3
19703429.7
19713529.7
19722029.7
First to last qualifying date each year at Sun Valley For each year, a bar from the first to the last day at Sun Valley meeting 30 C (86 F). 1938: 26 June 1938 to 7 August 19381939: 29 June 1939 to 27 August 19391940: 16 June 1940 to 20 August 19401941: 15 July 1941 to 8 August 19411942: 3 July 1942 to 23 August 19421943: 6 July 1943 to 14 September 19431944: 17 July 1944 to 9 September 19441945: 21 July 1945 to 1 September 19451946: 11 July 1946 to 22 August 19461947: 2 July 1947 to 5 September 19471948: 10 July 1948 to 13 September 19481949: 8 July 1949 to 1 September 19491950: 1 July 1950 to 6 September 19501951: 13 July 1951 to 18 August 19511952: 9 July 1952 to 23 August 19521953: 7 July 1953 to 13 September 19531954: 19 May 1954 to 30 August 19541955: 14 July 1955 to 8 September 19551956: 9 July 1956 to 24 August 19561957: 10 July 1957 to 7 September 19571958: 12 July 1958 to 25 August 19581959: 10 July 1959 to 11 September 19591960: 12 July 1960 to 20 August 19601961: 17 June 1961 to 23 August 19611962: 25 June 1962 to 16 August 19621963: 1 August 1963 to 16 August 19631964: 8 July 1964 to 11 August 19641965: 14 July 1965 to 10 August 19651966: 28 June 1966 to 6 September 19661967: 11 July 1967 to 4 September 19671968: 26 June 1968 to 2 September 19681969: 18 July 1969 to 2 September 19691970: 23 June 1970 to 26 August 19701971: 14 July 1971 to 27 August 19711972: 29 June 1972 to 12 August 19721938194319481953195819631968JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Sun Valley meeting 30 C (86 F).
First to last qualifying date each year at Sun Valley
YearFirst dateLast date
19381938-06-261938-08-07
19391939-06-291939-08-27
19401940-06-161940-08-20
19411941-07-151941-08-08
19421942-07-031942-08-23
19431943-07-061943-09-14
19441944-07-171944-09-09
19451945-07-211945-09-01
19461946-07-111946-08-22
19471947-07-021947-09-05
19481948-07-101948-09-13
19491949-07-081949-09-01
19501950-07-011950-09-06
19511951-07-131951-08-18
19521952-07-091952-08-23
19531953-07-071953-09-13
19541954-05-191954-08-30
19551955-07-141955-09-08
19561956-07-091956-08-24
19571957-07-101957-09-07
19581958-07-121958-08-25
19591959-07-101959-09-11
19601960-07-121960-08-20
19611961-06-171961-08-23
19621962-06-251962-08-16
19631963-08-011963-08-16
19641964-07-081964-08-11
19651965-07-141965-08-10
19661966-06-281966-09-06
19671967-07-111967-09-04
19681968-06-261968-09-02
19691969-07-181969-09-02
19701970-06-231970-08-26
19711971-07-141971-08-27
19721972-06-291972-08-12

Every Fixed Threshold

Fixed thresholds at Sun Valley
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days3543196120
35 C (95 F): Days6219601
90 F (32.2 C): Days311619607
0 C (32 F): Ice days (max3580195246
0 C (32 F): Frost days (min343261942257
-10 C (14 F): Days with min34145194292
-20 C (-4 F): Days with min3464195224
-30 C (-22 F): Days with min281219421
-40 C (-40 F): Days with min2119431
10 mm (0.39 in): Days with 10 mm or more rain352319389
25 mm (0.98 in): Days with 25 mm or more rain28419434
50 mm (1.97 in): Days with 50 mm or more rain3219551
10 cm (3.9 in): Days with 10 cm or more snowfall332219524
25 cm (9.8 in): Days with 25 cm or more snowfall28919521
50 cm (19.7 in): Days with 50 cm or more snowfall2119521

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1938.

Download the Data

  • Data for Sun 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 2026-10-14 (14 October 2026). Threshold counts are computed by this site.

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