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Built 2026-10-19 (19 October 2026)

Summit 1 W Threshold Days by Year (USC00398116)

19 fixed thresholds counted per year at Summit 1 W (USC00398116): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Summit 1 W Thresholds

  • Summit 1 W: days with a maximum temperature at or above 30 C (86 F) in 68 years, most in 1976 with 59.
  • Summit 1 W: days with a maximum temperature at or below 0 C (32 F) in 68 years, most in 1978 with 121.
  • Summit 1 W: nights with a minimum temperature at or below 0 C (32 F) in 68 years, most in 1959 with 206.
  • Summit 1 W: nights with a minimum temperature at or below -10 C (14 F) in 68 years, most in 1978 with 114.
  • 19 fixed thresholds have at least one qualifying day at Summit 1 W.
68 years with a qualifying day
Days at or above 30 C (86 F) per year at Summit 1 W Days per year at Summit 1 W with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 59 in 1976. 02040601957: 211958: 291959: 481960: 291961: 251962: 91963: 151964: 341965: 111966: 251967: 121968: 241969: 221970: 391971: 201972: 151973: 281974: 321975: 341976: 591977: 161978: 281979: 141980: 251983: 491984: 241985: 201986: 131987: 321988: 491989: 291990: 241991: 161992: 61993: 71994: 61995: 191996: 41997: 141998: 141999: 162000: 272001: 372002: 342003: 192004: 72005: 302006: 272007: 242008: 82009: 102010: 312011: 282012: 582013: 252014: 92015: 212016: 262017: 272018: 252019: 162020: 352021: 452022: 272023: 362024: 162025: 202026: 301957196419711978198719942001200820152022
Days per year at Summit 1 W with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 59 in 1976.
Days at or above 30 C (86 F) per year at Summit 1 W
YearDaysDecade average
19572132.7
19582932.7
19594832.7
19602920.6
19612520.6
1962920.6
19631520.6
19643420.6
19651120.6
19662520.6
19671220.6
19682420.6
19692220.6
19703928.5
19712028.5
19721528.5
19732828.5
19743228.5
19753428.5
19765928.5
19771628.5
19782828.5
19791428.5
19802530.1
19834930.1
19842430.1
19852030.1
19861330.1
19873230.1
19884930.1
19892930.1
19902412.6
19911612.6
1992612.6
1993712.6
1994612.6
19951912.6
1996412.6
19971412.6
19981412.6
19991612.6
20002722.3
20013722.3
20023422.3
20031922.3
2004722.3
20053022.3
20062722.3
20072422.3
2008822.3
20091022.3
20103126.6
20112826.6
20125826.6
20132526.6
2014926.6
20152126.6
20162626.6
20172726.6
20182526.6
20191626.6
20203529.9
20214529.9
20222729.9
20233629.9
20241629.9
20252029.9
20263029.9
First to last qualifying date each year at Summit 1 W For each year, a bar from the first to the last day at Summit 1 W meeting 30 C (86 F). 1957: 6 July 1957 to 31 August 19571958: 29 May 1958 to 15 October 19581959: 1 May 1959 to 14 September 19591960: 10 July 1960 to 20 September 19601961: 9 June 1961 to 9 September 19611962: 25 April 1962 to 27 August 19621963: 26 June 1963 to 5 October 19631964: 21 May 1964 to 2 September 19641965: 16 July 1965 to 14 August 19651966: 28 June 1966 to 30 August 19661967: 21 July 1967 to 28 August 19671968: 30 April 1968 to 23 August 19681969: 27 May 1969 to 15 September 19691970: 6 June 1970 to 9 September 19701971: 27 June 1971 to 7 September 19711972: 17 May 1972 to 19 September 19721973: 9 June 1973 to 31 August 19731974: 20 June 1974 to 27 September 19741975: 28 June 1975 to 10 September 19751976: 7 June 1976 to 30 September 19761977: 5 June 1977 to 8 September 19771978: 19 June 1978 to 12 September 19781979: 14 June 1979 to 10 September 19791980: 20 April 1980 to 7 October 19801983: 21 June 1983 to 27 September 19831984: 8 July 1984 to 20 September 19841985: 17 April 1985 to 8 August 19851986: 18 June 1986 to 15 August 19861987: 10 May 1987 to 30 August 19871988: 18 May 1988 to 17 September 19881989: 19 June 1989 to 30 September 19891990: 11 June 1990 to 26 September 19901991: 12 May 1991 to 29 August 19911992: 30 April 1992 to 2 October 19921993: 30 July 1993 to 6 October 19931994: 24 May 1994 to 14 September 19941995: 15 June 1995 to 24 August 19951996: 11 June 1996 to 28 June 19961997: 23 June 1997 to 26 August 19971998: 24 June 1998 to 18 September 19981999: 4 June 1999 to 28 August 19992000: 5 May 2000 to 30 September 20002001: 14 May 2001 to 6 September 20012002: 30 May 2002 to 16 September 20022003: 2 July 2003 to 7 September 20032004: 28 April 2004 to 3 September 20042005: 19 June 2005 to 21 September 20052006: 27 May 2006 to 23 August 20062007: 21 June 2007 to 23 September 20072008: 11 July 2008 to 2 September 20082009: 23 April 2009 to 14 August 20092010: 24 May 2010 to 9 October 20102011: 6 June 2011 to 28 September 20112012: 17 May 2012 to 15 September 20122013: 13 May 2013 to 19 September 20132014: 29 May 2014 to 22 July 20142015: 9 June 2015 to 11 October 20152016: 6 May 2016 to 29 August 20162017: 2 June 2017 to 22 September 20172018: 25 May 2018 to 17 September 20182019: 4 June 2019 to 20 September 20192020: 1 June 2020 to 26 August 20202021: 1 May 2021 to 28 September 20212022: 12 June 2022 to 8 September 20222023: 1 June 2023 to 2 October 20232024: 12 June 2024 to 30 September 20242025: 12 May 2025 to 4 October 20252026: 23 April 2026 to 11 October 202619571966197519861995200420132022JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Summit 1 W meeting 30 C (86 F).
First to last qualifying date each year at Summit 1 W
YearFirst dateLast date
19571957-07-061957-08-31
19581958-05-291958-10-15
19591959-05-011959-09-14
19601960-07-101960-09-20
19611961-06-091961-09-09
19621962-04-251962-08-27
19631963-06-261963-10-05
19641964-05-211964-09-02
19651965-07-161965-08-14
19661966-06-281966-08-30
19671967-07-211967-08-28
19681968-04-301968-08-23
19691969-05-271969-09-15
19701970-06-061970-09-09
19711971-06-271971-09-07
19721972-05-171972-09-19
19731973-06-091973-08-31
19741974-06-201974-09-27
19751975-06-281975-09-10
19761976-06-071976-09-30
19771977-06-051977-09-08
19781978-06-191978-09-12
19791979-06-141979-09-10
19801980-04-201980-10-07
19831983-06-211983-09-27
19841984-07-081984-09-20
19851985-04-171985-08-08
19861986-06-181986-08-15
19871987-05-101987-08-30
19881988-05-181988-09-17
19891989-06-191989-09-30
19901990-06-111990-09-26
19911991-05-121991-08-29
19921992-04-301992-10-02
19931993-07-301993-10-06
19941994-05-241994-09-14
19951995-06-151995-08-24
19961996-06-111996-06-28
19971997-06-231997-08-26
19981998-06-241998-09-18
19991999-06-041999-08-28
20002000-05-052000-09-30
20012001-05-142001-09-06
20022002-05-302002-09-16
20032003-07-022003-09-07
20042004-04-282004-09-03
20052005-06-192005-09-21
20062006-05-272006-08-23
20072007-06-212007-09-23
20082008-07-112008-09-02
20092009-04-232009-08-14
20102010-05-242010-10-09
20112011-06-062011-09-28
20122012-05-172012-09-15
20132013-05-132013-09-19
20142014-05-292014-07-22
20152015-06-092015-10-11
20162016-05-062016-08-29
20172017-06-022017-09-22
20182018-05-252018-09-17
20192019-06-042019-09-20
20202020-06-012020-08-26
20212021-05-012021-09-28
20222022-06-122022-09-08
20232023-06-012023-10-02
20242024-06-122024-09-30
20252025-05-122025-10-04
20262026-04-232026-10-11

Every Fixed Threshold

Fixed thresholds at Summit 1 W
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days6859197630
35 C (95 F): Days331819882
90 F (32.2 C): Days6539197611
100 F (37.8 C): Days9519881
0 C (32 F): Ice days (max68121197848
0 C (32 F): Frost days (min682061959117
-10 C (14 F): Days with min68114197846
-20 C (-4 F): Days with min6861198520
-30 C (-22 F): Days with min611819852
-40 C (-40 F): Days with min1119941
20 C (68 F): Tropical nights (min611319884
25 C (77 F): Days with min2120111
10 mm (0.39 in): Days with 10 mm or more rain6828198611
25 mm (0.98 in): Days with 25 mm or more rain671119712
50 mm (1.97 in): Days with 50 mm or more rain29319572
100 mm (3.94 in): Days with 100 mm or more rain3119711
10 cm (3.9 in): Days with 10 cm or more snowfall651120193
25 cm (9.8 in): Days with 25 cm or more snowfall13320081
50 cm (19.7 in): Days with 50 cm or more snowfall1119971

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1957.

Download the Data

  • Data for Summit 1 W 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 (2026-10-17).