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Built 2026-10-19 (19 October 2026)

Summit WSO AP Threshold Days by Year (USW00026414)

13 fixed thresholds counted per year at Summit WSO AP (USW00026414): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Summit WSO AP Thresholds

  • Summit WSO AP: days with 10 mm (0.39 in) or more of precipitation in 33 years, most in 1954 with 20.
  • Summit WSO AP: days with a maximum temperature at or below 0 C (32 F) in 32 years, most in 1972 with 202.
  • Summit WSO AP: nights with a minimum temperature at or below 0 C (32 F) in 32 years, most in 1952 with 269.
  • Summit WSO AP: nights with a minimum temperature at or below -10 C (14 F) in 32 years, most in 1972 with 182.
  • 13 fixed thresholds have at least one qualifying day at Summit WSO AP.
32 years with a qualifying day
Nights at or below 0 C (32 F) per year at Summit WSO AP Days per year at Summit WSO AP with nights with a minimum temperature at or below 0 C (32 F), with the decade average as a line. The most was 269 in 1952. 01002003001942: 2271943: 2311944: 2261945: 2511946: 2471947: 2541948: 2631951: 2411952: 2691953: 2441954: 2391955: 2651956: 2591957: 2391958: 2511959: 2421960: 2361961: 2451962: 2521963: 2501964: 2511965: 2511966: 2491967: 2441968: 2661969: 2571970: 2561971: 2631972: 2611973: 2521974: 2491975: 24719421946195219561960196419681972
Days per year at Summit WSO AP with nights with a minimum temperature at or below 0 C (32 F), with the decade average as a line. The most was 269 in 1952.
Nights at or below 0 C (32 F) per year at Summit WSO AP
YearDaysDecade average
1942227242.7
1943231242.7
1944226242.7
1945251242.7
1946247242.7
1947254242.7
1948263242.7
1951241249.9
1952269249.9
1953244249.9
1954239249.9
1955265249.9
1956259249.9
1957239249.9
1958251249.9
1959242249.9
1960236250.1
1961245250.1
1962252250.1
1963250250.1
1964251250.1
1965251250.1
1966249250.1
1967244250.1
1968266250.1
1969257250.1
1970256254.7
1971263254.7
1972261254.7
1973252254.7
1974249254.7
1975247254.7
First to last qualifying date each year at Summit WSO AP For each year, a bar from the first to the last day at Summit WSO AP meeting 0 C (32 F). 1942: 1 January 1942 to 31 December 19421943: 1 January 1943 to 31 December 19431944: 1 January 1944 to 30 November 19441945: 1 January 1945 to 31 December 19451946: 1 January 1946 to 31 December 19461947: 1 January 1947 to 31 December 19471948: 1 January 1948 to 31 December 19481951: 1 January 1951 to 31 December 19511952: 1 January 1952 to 31 December 19521953: 1 January 1953 to 31 December 19531954: 1 January 1954 to 31 December 19541955: 1 January 1955 to 31 December 19551956: 1 January 1956 to 31 December 19561957: 1 January 1957 to 31 December 19571958: 1 January 1958 to 31 December 19581959: 1 January 1959 to 31 December 19591960: 1 January 1960 to 31 December 19601961: 1 January 1961 to 31 December 19611962: 1 January 1962 to 31 December 19621963: 1 January 1963 to 31 December 19631964: 1 January 1964 to 31 December 19641965: 1 January 1965 to 31 December 19651966: 1 January 1966 to 31 December 19661967: 1 January 1967 to 31 December 19671968: 1 January 1968 to 31 December 19681969: 1 January 1969 to 31 December 19691970: 1 January 1970 to 31 December 19701971: 1 January 1971 to 31 December 19711972: 1 January 1972 to 31 December 19721973: 1 January 1973 to 31 December 19731974: 1 January 1974 to 31 December 19741975: 1 January 1975 to 31 December 197519421946195219561960196419681972JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Summit WSO AP meeting 0 C (32 F).
First to last qualifying date each year at Summit WSO AP
YearFirst dateLast date
19421942-01-011942-12-31
19431943-01-011943-12-31
19441944-01-011944-11-30
19451945-01-011945-12-31
19461946-01-011946-12-31
19471947-01-011947-12-31
19481948-01-011948-12-31
19511951-01-011951-12-31
19521952-01-011952-12-31
19531953-01-011953-12-31
19541954-01-011954-12-31
19551955-01-011955-12-31
19561956-01-011956-12-31
19571957-01-011957-12-31
19581958-01-011958-12-31
19591959-01-011959-12-31
19601960-01-011960-12-31
19611961-01-011961-12-31
19621962-01-011962-12-31
19631963-01-011963-12-31
19641964-01-011964-12-31
19651965-01-011965-12-31
19661966-01-011966-12-31
19671967-01-011967-12-31
19681968-01-011968-12-31
19691969-01-011969-12-31
19701970-01-011970-12-31
19711971-01-011971-12-31
19721972-01-011972-12-31
19731973-01-011973-12-31
19741974-01-011974-12-31
19751975-01-011975-12-31

Every Fixed Threshold

Fixed thresholds at Summit WSO AP
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days1119611
0 C (32 F): Ice days (max322021972178
0 C (32 F): Frost days (min322691952247
-10 C (14 F): Days with min321821972159
-20 C (-4 F): Days with min32103195676
-30 C (-22 F): Days with min3231197122
-40 C (-40 F): Days with min4319471
10 mm (0.39 in): Days with 10 mm or more rain3320195414
25 mm (0.98 in): Days with 25 mm or more rain24419421
50 mm (1.97 in): Days with 50 mm or more rain3119431
10 cm (3.9 in): Days with 10 cm or more snowfall302119707
25 cm (9.8 in): Days with 25 cm or more snowfall17419461
50 cm (19.7 in): Days with 50 cm or more snowfall2119511

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1961.

Download the Data

  • Data for Summit WSO AP 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).