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Built 2026-10-19 (19 October 2026)

Mc Lean Threshold Days by Year (USC00415770)

18 fixed thresholds counted per year at Mc Lean (USC00415770): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Mc Lean Thresholds

  • Mc Lean: days with 10 mm (0.39 in) or more of precipitation in 46 years, most in 1986 with 29.
  • Mc Lean: days with 25 mm (0.98 in) or more of precipitation in 46 years, most in 1997 with 14.
  • Mc Lean: nights with a minimum temperature at or below 0 C (32 F) in 37 years, most in 1993 with 106.
  • Mc Lean: nights with a minimum temperature at or below -10 C (14 F) in 37 years, most in 1963 with 22.
  • 18 fixed thresholds have at least one qualifying day at Mc Lean.
36 years with a qualifying day
Days at or above 30 C (86 F) per year at Mc Lean Days per year at Mc Lean with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 139 in 1963. 0501001501907: 871908: 691963: 1391964: 1171965: 1151966: 891967: 901968: 731969: 871970: 1051972: 1161977: 1121980: 1261981: 1101982: 971983: 1111984: 1191985: 951986: 1001987: 831988: 861989: 961990: 961991: 811992: 831993: 871994: 1041995: 861996: 941997: 831998: 1252000: 1202001: 1032003: 912005: 1112007: 68190719651969198019841988199219962001
Days per year at Mc Lean with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 139 in 1963.
Days at or above 30 C (86 F) per year at Mc Lean
YearDaysDecade average
19078778
19086978
1963139101.4
1964117101.4
1965115101.4
196689101.4
196790101.4
196873101.4
196987101.4
1970105111
1972116111
1977112111
1980126102.3
1981110102.3
198297102.3
1983111102.3
1984119102.3
198595102.3
1986100102.3
198783102.3
198886102.3
198996102.3
19909693.2
19918193.2
19928393.2
19938793.2
199410493.2
19958693.2
19969493.2
19978393.2
199812593.2
200012098.6
200110398.6
20039198.6
200511198.6
20076898.6
First to last qualifying date each year at Mc Lean For each year, a bar from the first to the last day at Mc Lean meeting 30 C (86 F). 1907: 18 March 1907 to 2 October 19071908: 17 March 1908 to 16 October 19081963: 28 March 1963 to 30 October 19631964: 16 April 1964 to 17 October 19641965: 17 April 1965 to 10 October 19651966: 8 May 1966 to 14 October 19661967: 30 March 1967 to 13 October 19671968: 17 April 1968 to 30 October 19681969: 2 April 1969 to 10 October 19691970: 18 February 1970 to 7 October 19701972: 15 March 1972 to 18 October 19721977: 29 April 1977 to 18 October 19771980: 19 April 1980 to 9 November 19801981: 7 April 1981 to 14 October 19811982: 12 April 1982 to 19 October 19821983: 27 April 1983 to 15 October 19831984: 14 March 1984 to 25 September 19841985: 20 April 1985 to 8 October 19851986: 30 March 1986 to 27 September 19861987: 17 April 1987 to 13 October 19871988: 14 May 1988 to 4 November 19881989: 10 March 1989 to 15 October 19891990: 8 May 1990 to 5 October 19901991: 11 April 1991 to 17 October 19911992: 30 April 1992 to 13 October 19921993: 18 April 1993 to 1 October 19931994: 17 March 1994 to 3 October 19941995: 19 March 1995 to 22 October 19951996: 22 February 1996 to 16 October 19961997: 21 March 1997 to 4 October 19971998: 25 March 1998 to 15 October 19982000: 5 April 2000 to 4 October 20002001: 4 April 2001 to 4 October 20012003: 1 April 2003 to 21 October 20032005: 11 May 2005 to 8 November 20052007: 6 June 2007 to 21 October 200719071966197219831988199319982007JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Mc Lean meeting 30 C (86 F).
First to last qualifying date each year at Mc Lean
YearFirst dateLast date
19071907-03-181907-10-02
19081908-03-171908-10-16
19631963-03-281963-10-30
19641964-04-161964-10-17
19651965-04-171965-10-10
19661966-05-081966-10-14
19671967-03-301967-10-13
19681968-04-171968-10-30
19691969-04-021969-10-10
19701970-02-181970-10-07
19721972-03-151972-10-18
19771977-04-291977-10-18
19801980-04-191980-11-09
19811981-04-071981-10-14
19821982-04-121982-10-19
19831983-04-271983-10-15
19841984-03-141984-09-25
19851985-04-201985-10-08
19861986-03-301986-09-27
19871987-04-171987-10-13
19881988-05-141988-11-04
19891989-03-101989-10-15
19901990-05-081990-10-05
19911991-04-111991-10-17
19921992-04-301992-10-13
19931993-04-181993-10-01
19941994-03-171994-10-03
19951995-03-191995-10-22
19961996-02-221996-10-16
19971997-03-211997-10-04
19981998-03-251998-10-15
20002000-04-052000-10-04
20012001-04-042001-10-04
20032003-04-012003-10-21
20052005-05-112005-11-08
20072007-06-062007-10-21

Every Fixed Threshold

Fixed thresholds at Mc Lean
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days36139196368
35 C (95 F): Days367719807
40 C (104 F): Days141119801
90 F (32.2 C): Days36113196336
100 F (37.8 C): Days273519809
110 F (43.3 C): Days1319803
0 C (32 F): Ice days (max3619198315
0 C (32 F): Frost days (min37106199388
-10 C (14 F): Days with min372219638
-20 C (-4 F): Days with min6519891
20 C (68 F): Tropical nights (min3770198025
25 C (77 F): Days with min4219691
10 mm (0.39 in): Days with 10 mm or more rain4629198623
25 mm (0.98 in): Days with 25 mm or more rain4614199712
50 mm (1.97 in): Days with 50 mm or more rain36619863
100 mm (3.94 in): Days with 100 mm or more rain5119771
10 cm (3.9 in): Days with 10 cm or more snowfall19619921
25 cm (9.8 in): Days with 25 cm or more snowfall2120051

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1907.

Download the Data

  • Data for Mc Lean 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).