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Built 2026-10-16 (16 October 2026)

Supai Threshold Days by Year

15 fixed thresholds counted per year at Supai (USC00028343): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Supai Thresholds

  • Supai: days with 10 mm (0.39 in) or more of precipitation in 38 years, most in 1909 with 13.
  • Supai: days with a maximum temperature at or above 30 C (86 F) in 37 years, most in 1974 with 156.
  • Supai: days with a maximum temperature at or above 35 C (95 F) in 37 years, most in 1900 with 109.
  • Supai: days with a maximum temperature at or above 90 F (32.2 C) in 37 years, most in 1900 with 135.
  • 15 fixed thresholds have at least one qualifying day at Supai.
37 years with a qualifying day
Days at or above 30 C (86 F) per year at Supai Days per year at Supai with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 156 in 1974. 0501001502001900: 1521908: 1221909: 1251912: 1241913: 1301914: 1361915: 1061924: 1211925: 721926: 1181927: 1481930: 1281957: 1241958: 1481962: 1461963: 1471964: 1391966: 1421967: 1211968: 1261970: 1331971: 1321972: 1411973: 1381974: 1561975: 1431976: 1361977: 1401978: 1401979: 1361980: 1381981: 1411982: 1221983: 1261984: 1391985: 1471986: 1381900191319251957196419701974197819821986
Days per year at Supai with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 156 in 1974.
Days at or above 30 C (86 F) per year at Supai
YearDaysDecade average
1900152133
1908122133
1909125133
1912124124
1913130124
1914136124
1915106124
1924121114.8
192572114.8
1926118114.8
1927148114.8
1930128128
1957124136
1958148136
1962146136.8
1963147136.8
1964139136.8
1966142136.8
1967121136.8
1968126136.8
1970133139.5
1971132139.5
1972141139.5
1973138139.5
1974156139.5
1975143139.5
1976136139.5
1977140139.5
1978140139.5
1979136139.5
1980138135.9
1981141135.9
1982122135.9
1983126135.9
1984139135.9
1985147135.9
1986138135.9
First to last qualifying date each year at Supai For each year, a bar from the first to the last day at Supai meeting 30 C (86 F). 1900: 11 March 1900 to 12 October 19001908: 14 April 1908 to 12 October 19081909: 16 April 1909 to 8 November 19091912: 13 March 1912 to 30 September 19121913: 30 March 1913 to 14 October 19131914: 3 April 1914 to 26 September 19141915: 10 April 1915 to 9 October 19151924: 2 May 1924 to 26 September 19241925: 30 April 1925 to 17 September 19251926: 15 May 1926 to 23 September 19261927: 19 April 1927 to 21 October 19271930: 10 February 1930 to 20 October 19301957: 1 May 1957 to 9 October 19571958: 17 April 1958 to 19 October 19581962: 7 April 1962 to 25 October 19621963: 30 April 1963 to 15 October 19631964: 15 April 1964 to 29 October 19641966: 1 April 1966 to 30 September 19661967: 8 May 1967 to 14 October 19671968: 30 April 1968 to 13 October 19681970: 3 May 1970 to 2 October 19701971: 30 March 1971 to 14 October 19711972: 6 March 1972 to 13 October 19721973: 27 April 1973 to 22 October 19731974: 17 April 1974 to 20 October 19741975: 9 May 1975 to 11 October 19751976: 25 April 1976 to 1 October 19761977: 8 April 1977 to 17 October 19771978: 11 May 1978 to 19 October 19781979: 5 May 1979 to 12 October 19791980: 18 April 1980 to 11 October 19801981: 16 April 1981 to 1 October 19811982: 28 April 1982 to 27 September 19821983: 27 April 1983 to 29 October 19831984: 3 May 1984 to 10 October 19841985: 7 April 1985 to 6 October 19851986: 21 April 1986 to 21 October 198619001914192719631970197519801985JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Supai meeting 30 C (86 F).
First to last qualifying date each year at Supai
YearFirst dateLast date
19001900-03-111900-10-12
19081908-04-141908-10-12
19091909-04-161909-11-08
19121912-03-131912-09-30
19131913-03-301913-10-14
19141914-04-031914-09-26
19151915-04-101915-10-09
19241924-05-021924-09-26
19251925-04-301925-09-17
19261926-05-151926-09-23
19271927-04-191927-10-21
19301930-02-101930-10-20
19571957-05-011957-10-09
19581958-04-171958-10-19
19621962-04-071962-10-25
19631963-04-301963-10-15
19641964-04-151964-10-29
19661966-04-011966-09-30
19671967-05-081967-10-14
19681968-04-301968-10-13
19701970-05-031970-10-02
19711971-03-301971-10-14
19721972-03-061972-10-13
19731973-04-271973-10-22
19741974-04-171974-10-20
19751975-05-091975-10-11
19761976-04-251976-10-01
19771977-04-081977-10-17
19781978-05-111978-10-19
19791979-05-051979-10-12
19801980-04-181980-10-11
19811981-04-161981-10-01
19821982-04-281982-09-27
19831983-04-271983-10-29
19841984-05-031984-10-10
19851985-04-071985-10-06
19861986-04-211986-10-21

Every Fixed Threshold

Fixed thresholds at Supai
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days371561974138
35 C (95 F): Days37109190095
40 C (104 F): Days3451190033
45 C (113 F): Days2519002
90 F (32.2 C): Days371351900129
100 F (37.8 C): Days3779190061
110 F (43.3 C): Days91619004
0 C (32 F): Ice days (max5219131
0 C (32 F): Frost days (min37141197920
-10 C (14 F): Days with min1622196212
20 C (68 F): Tropical nights (min3468195856
25 C (77 F): Days with min18519632
10 mm (0.39 in): Days with 10 mm or more rain381319096
25 mm (0.98 in): Days with 25 mm or more rain18619091
50 mm (1.97 in): Days with 50 mm or more rain2119251

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1900.

Download the Data

  • Data for Supai 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).