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Data as of 2026-10-17
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Built 2026-10-19 (19 October 2026)

Summit Threshold Days by Year (USC00247978)

17 fixed thresholds counted per year at Summit (USC00247978): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Summit Thresholds

  • Summit: days with a maximum temperature at or below 0 C (32 F) in 46 years, most in 1975 with 123.
  • Summit: nights with a minimum temperature at or below 0 C (32 F) in 44 years, most in 1944 with 264.
  • Summit: nights with a minimum temperature at or below -10 C (14 F) in 44 years, most in 1949 with 94.
  • Summit: nights with a minimum temperature at or below -20 C (-4 F) in 44 years, most in 1936 with 48.
  • 17 fixed thresholds have at least one qualifying day at Summit.
32 years with a qualifying day
Days at or above 30 C (86 F) per year at Summit Days per year at Summit with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 16 in 1961. 051015201935: 51936: 121939: 61940: 51941: 31946: 51947: 11949: 31950: 21951: 21954: 11955: 61959: 41960: 81961: 161963: 61967: 101969: 51970: 21971: 61973: 41974: 31975: 12018: 22019: 22020: 62021: 102022: 122023: 102024: 122025: 22026: 619351941195019591967197320192023
Days per year at Summit with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 16 in 1961.
Days at or above 30 C (86 F) per year at Summit
YearDaysDecade average
193557.7
1936127.7
193967.7
194053.4
194133.4
194653.4
194713.4
194933.4
195023
195123
195413
195563
195943
196089
1961169
196369
1967109
196959
197023.2
197163.2
197343.2
197433.2
197513.2
201822
201922
202068.3
2021108.3
2022128.3
2023108.3
2024128.3
202528.3
202668.3
First to last qualifying date each year at Summit For each year, a bar from the first to the last day at Summit meeting 30 C (86 F). 1935: 14 July 1935 to 22 August 19351936: 23 June 1936 to 30 July 19361939: 9 July 1939 to 3 August 19391940: 11 July 1940 to 19 August 19401941: 23 June 1941 to 10 August 19411946: 29 July 1946 to 23 August 19461947: 14 July 1947 to 14 July 19471949: 2 August 1949 to 6 August 19491950: 3 September 1950 to 4 September 19501951: 3 August 1951 to 4 August 19511954: 6 July 1954 to 6 July 19541955: 14 July 1955 to 30 August 19551959: 23 July 1959 to 1 August 19591960: 17 July 1960 to 31 July 19601961: 17 June 1961 to 24 August 19611963: 6 August 1963 to 14 August 19631967: 11 August 1967 to 5 September 19671969: 4 August 1969 to 25 August 19691970: 20 July 1970 to 21 July 19701971: 1 August 1971 to 28 August 19711973: 11 July 1973 to 4 August 19731974: 16 June 1974 to 23 June 19741975: 27 July 1975 to 27 July 19752018: 10 August 2018 to 11 August 20182019: 24 July 2019 to 22 August 20192020: 28 July 2020 to 18 August 20202021: 15 June 2021 to 2 August 20212022: 18 July 2022 to 4 September 20222023: 23 July 2023 to 18 August 20232024: 10 July 2024 to 4 August 20242025: 3 July 2025 to 4 September 20252026: 17 July 2026 to 27 August 202619351941195019591967197320192023JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Summit meeting 30 C (86 F).
First to last qualifying date each year at Summit
YearFirst dateLast date
19351935-07-141935-08-22
19361936-06-231936-07-30
19391939-07-091939-08-03
19401940-07-111940-08-19
19411941-06-231941-08-10
19461946-07-291946-08-23
19471947-07-141947-07-14
19491949-08-021949-08-06
19501950-09-031950-09-04
19511951-08-031951-08-04
19541954-07-061954-07-06
19551955-07-141955-08-30
19591959-07-231959-08-01
19601960-07-171960-07-31
19611961-06-171961-08-24
19631963-08-061963-08-14
19671967-08-111967-09-05
19691969-08-041969-08-25
19701970-07-201970-07-21
19711971-08-011971-08-28
19731973-07-111973-08-04
19741974-06-161974-06-23
19751975-07-271975-07-27
20182018-08-102018-08-11
20192019-07-242019-08-22
20202020-07-282020-08-18
20212021-06-152021-08-02
20222022-07-182022-09-04
20232023-07-232023-08-18
20242024-07-102024-08-04
20252025-07-032025-09-04
20262026-07-172026-08-27

Every Fixed Threshold

Fixed thresholds at Summit
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days321619616
35 C (95 F): Days3119611
90 F (32.2 C): Days18719612
0 C (32 F): Ice days (max46123197533
0 C (32 F): Frost days (min442641944129
-10 C (14 F): Days with min4494194918
-20 C (-4 F): Days with min444819367
-30 C (-22 F): Days with min342019365
-40 C (-40 F): Days with min18519361
20 C (68 F): Tropical nights (min1119361
10 mm (0.39 in): Days with 10 mm or more rain414019645
25 mm (0.98 in): Days with 25 mm or more rain39919721
50 mm (1.97 in): Days with 50 mm or more rain9319641
100 mm (3.94 in): Days with 100 mm or more rain1119641
10 cm (3.9 in): Days with 10 cm or more snowfall3238197021
25 cm (9.8 in): Days with 25 cm or more snowfall281119704
50 cm (19.7 in): Days with 50 cm or more snowfall8119461

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1935.

Download the Data

  • Data for Summit 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).