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Built 2026-10-19 (19 October 2026)

Mt Diablo Junction Threshold Days by Year (USC00045915)

16 fixed thresholds counted per year at Mt Diablo Junction (USC00045915): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Mt Diablo Junction Thresholds

  • Mt Diablo Junction: days with 10 mm (0.39 in) or more of precipitation in 72 years, most in 1983 with 40.
  • Mt Diablo Junction: days with a maximum temperature at or above 30 C (86 F) in 71 years, most in 1967 with 93.
  • Mt Diablo Junction: days with a maximum temperature at or above 90 F (32.2 C) in 71 years, most in 1967 with 69.
  • Mt Diablo Junction: nights with a minimum temperature at or above 20 C (68 F) in 71 years, most in 2020 with 45.
  • 16 fixed thresholds have at least one qualifying day at Mt Diablo Junction.
71 years with a qualifying day
Days at or above 30 C (86 F) per year at Mt Diablo Junction Days per year at Mt Diablo Junction with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 93 in 1967. 02550751001953: 481954: 491955: 571956: 571957: 601958: 621959: 761960: 771961: 751962: 661963: 541964: 731965: 731966: 881967: 931968: 611969: 811970: 861971: 761972: 651973: 781974: 861975: 751976: 621977: 781978: 751979: 651980: 311981: 581982: 361983: 391984: 701985: 531989: 521990: 491991: 561992: 681993: 531994: 531995: 471996: 761997: 461998: 451999: 452000: 542001: 712002: 622003: 732004: 562005: 512006: 532007: 432008: 652009: 462010: 302011: 252012: 422013: 252014: 342015: 362016: 422017: 412018: 392019: 312020: 542021: 522022: 442023: 312024: 682025: 382026: 31195319611969197719851996200420122020
Days per year at Mt Diablo Junction with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 93 in 1967.
Days at or above 30 C (86 F) per year at Mt Diablo Junction
YearDaysDecade average
19534858.4
19544958.4
19555758.4
19565758.4
19576058.4
19586258.4
19597658.4
19607774.1
19617574.1
19626674.1
19635474.1
19647374.1
19657374.1
19668874.1
19679374.1
19686174.1
19698174.1
19708674.6
19717674.6
19726574.6
19737874.6
19748674.6
19757574.6
19766274.6
19777874.6
19787574.6
19796574.6
19803148.4
19815848.4
19823648.4
19833948.4
19847048.4
19855348.4
19895248.4
19904953.8
19915653.8
19926853.8
19935353.8
19945353.8
19954753.8
19967653.8
19974653.8
19984553.8
19994553.8
20005457.4
20017157.4
20026257.4
20037357.4
20045657.4
20055157.4
20065357.4
20074357.4
20086557.4
20094657.4
20103034.5
20112534.5
20124234.5
20132534.5
20143434.5
20153634.5
20164234.5
20174134.5
20183934.5
20193134.5
20205445.4
20215245.4
20224445.4
20233145.4
20246845.4
20253845.4
20263145.4
First to last qualifying date each year at Mt Diablo Junction For each year, a bar from the first to the last day at Mt Diablo Junction meeting 30 C (86 F). 1953: 22 June 1953 to 9 October 19531954: 18 May 1954 to 16 October 19541955: 21 May 1955 to 14 October 19551956: 16 May 1956 to 30 September 19561957: 4 June 1957 to 23 September 19571958: 17 May 1958 to 16 October 19581959: 9 May 1959 to 26 October 19591960: 31 May 1960 to 27 September 19601961: 14 June 1961 to 18 October 19611962: 6 May 1962 to 2 October 19621963: 18 May 1963 to 3 October 19631964: 14 June 1964 to 23 October 19641965: 27 May 1965 to 31 October 19651966: 1 April 1966 to 2 November 19661967: 17 May 1967 to 20 October 19671968: 28 May 1968 to 26 October 19681969: 18 May 1969 to 2 October 19691970: 4 May 1970 to 10 October 19701971: 16 June 1971 to 14 October 19711972: 3 May 1972 to 22 September 19721973: 12 May 1973 to 18 October 19731974: 26 May 1974 to 20 October 19741975: 17 May 1975 to 6 October 19751976: 12 May 1976 to 6 November 19761977: 31 May 1977 to 16 October 19771978: 20 May 1978 to 15 October 19781979: 14 May 1979 to 2 October 19791980: 29 June 1980 to 30 September 19801981: 30 April 1981 to 12 September 19811982: 24 May 1982 to 9 September 19821983: 21 May 1983 to 21 September 19831984: 23 May 1984 to 29 September 19841985: 5 April 1985 to 6 October 19851989: 7 April 1989 to 11 October 19891990: 14 April 1990 to 5 October 19901991: 2 June 1991 to 21 October 19911992: 3 May 1992 to 13 October 19921993: 14 June 1993 to 2 October 19931994: 30 May 1994 to 28 September 19941995: 30 May 1995 to 20 October 19951996: 1 May 1996 to 11 October 19961997: 17 May 1997 to 17 October 19971998: 16 June 1998 to 17 September 19981999: 23 June 1999 to 22 October 19992000: 21 May 2000 to 2 October 20002001: 8 May 2001 to 16 October 20012002: 30 May 2002 to 10 October 20022003: 22 May 2003 to 29 October 20032004: 27 April 2004 to 14 October 20042005: 14 June 2005 to 1 October 20052006: 15 May 2006 to 26 September 20062007: 9 May 2007 to 25 October 20072008: 28 April 2008 to 2 October 20082009: 21 April 2009 to 28 September 20092010: 14 June 2010 to 15 October 20102011: 16 June 2011 to 29 September 20112012: 10 May 2012 to 4 October 20122013: 2 June 2013 to 10 September 20132014: 15 May 2014 to 9 October 20142015: 8 June 2015 to 14 October 20152016: 19 May 2016 to 30 September 20162017: 24 May 2017 to 25 October 20172018: 3 June 2018 to 28 September 20182019: 11 June 2019 to 9 October 20192020: 8 May 2020 to 18 October 20202021: 31 May 2021 to 6 October 20212022: 25 May 2022 to 22 October 20222023: 30 June 2023 to 20 October 20232024: 1 June 2024 to 9 October 20242025: 31 May 2025 to 26 September 20252026: 21 March 2026 to 28 August 202619531962197119801992200120102019JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Mt Diablo Junction meeting 30 C (86 F).
First to last qualifying date each year at Mt Diablo Junction
YearFirst dateLast date
19531953-06-221953-10-09
19541954-05-181954-10-16
19551955-05-211955-10-14
19561956-05-161956-09-30
19571957-06-041957-09-23
19581958-05-171958-10-16
19591959-05-091959-10-26
19601960-05-311960-09-27
19611961-06-141961-10-18
19621962-05-061962-10-02
19631963-05-181963-10-03
19641964-06-141964-10-23
19651965-05-271965-10-31
19661966-04-011966-11-02
19671967-05-171967-10-20
19681968-05-281968-10-26
19691969-05-181969-10-02
19701970-05-041970-10-10
19711971-06-161971-10-14
19721972-05-031972-09-22
19731973-05-121973-10-18
19741974-05-261974-10-20
19751975-05-171975-10-06
19761976-05-121976-11-06
19771977-05-311977-10-16
19781978-05-201978-10-15
19791979-05-141979-10-02
19801980-06-291980-09-30
19811981-04-301981-09-12
19821982-05-241982-09-09
19831983-05-211983-09-21
19841984-05-231984-09-29
19851985-04-051985-10-06
19891989-04-071989-10-11
19901990-04-141990-10-05
19911991-06-021991-10-21
19921992-05-031992-10-13
19931993-06-141993-10-02
19941994-05-301994-09-28
19951995-05-301995-10-20
19961996-05-011996-10-11
19971997-05-171997-10-17
19981998-06-161998-09-17
19991999-06-231999-10-22
20002000-05-212000-10-02
20012001-05-082001-10-16
20022002-05-302002-10-10
20032003-05-222003-10-29
20042004-04-272004-10-14
20052005-06-142005-10-01
20062006-05-152006-09-26
20072007-05-092007-10-25
20082008-04-282008-10-02
20092009-04-212009-09-28
20102010-06-142010-10-15
20112011-06-162011-09-29
20122012-05-102012-10-04
20132013-06-022013-09-10
20142014-05-152014-10-09
20152015-06-082015-10-14
20162016-05-192016-09-30
20172017-05-242017-10-25
20182018-06-032018-09-28
20192019-06-112019-10-09
20202020-05-082020-10-18
20212021-05-312021-10-06
20222022-05-252022-10-22
20232023-06-302023-10-20
20242024-06-012024-10-09
20252025-05-312025-09-26
20262026-03-212026-08-28

Every Fixed Threshold

Fixed thresholds at Mt Diablo Junction
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days7193196731
35 C (95 F): Days693819672
40 C (104 F): Days24619661
90 F (32.2 C): Days7169196717
100 F (37.8 C): Days502119664
110 F (43.3 C): Days1119721
0 C (32 F): Ice days (max1119621
0 C (32 F): Frost days (min706820081
-10 C (14 F): Days with min2119891
20 C (68 F): Tropical nights (min7145202025
25 C (77 F): Days with min41920171
10 mm (0.39 in): Days with 10 mm or more rain7240198310
25 mm (0.98 in): Days with 25 mm or more rain691720175
50 mm (1.97 in): Days with 50 mm or more rain41620231
100 mm (3.94 in): Days with 100 mm or more rain8119551
10 cm (3.9 in): Days with 10 cm or more snowfall4419751

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1953.

Download the Data

  • Data for Mt Diablo Junction 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 (2026-10-12).