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Data as of 2025-12-31
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Built 2026-10-16 (16 October 2026)

Rocky Mountain Threshold Days by Year

4 fixed thresholds counted per year at Rocky Mountain (ASN00041387): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Rocky Mountain Thresholds

  • Rocky Mountain: days with 10 mm (0.39 in) or more of precipitation in 30 years, most in 1927 with 36.
  • Rocky Mountain: days with 25 mm (0.98 in) or more of precipitation in 30 years, most in 1954 with 18.
  • Rocky Mountain: days with 50 mm (1.97 in) or more of precipitation in 25 years, most in 1954 with 7.
  • Rocky Mountain: days with 100 mm (3.94 in) or more of precipitation in 8 years, most in 1928 with 2.
  • 4 fixed thresholds have at least one qualifying day at Rocky Mountain.
30 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Rocky Mountain Days per year at Rocky Mountain with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 36 in 1927. 0102030401926: 161927: 361928: 311929: 321930: 221931: 251932: 261933: 271934: 281935: 211936: 191937: 271938: 241939: 261940: 221941: 201942: 281943: 271944: 231945: 271946: 241947: 361948: 241949: 251950: 341951: 281953: 151954: 291955: 311956: 331926192919321935193819411944194719501954
Days per year at Rocky Mountain with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 36 in 1927.
Days with 10 mm (0.39 in) or more of precipitation per year at Rocky Mountain
YearDaysDecade average
19261628.8
19273628.8
19283128.8
19293228.8
19302224.5
19312524.5
19322624.5
19332724.5
19342824.5
19352124.5
19361924.5
19372724.5
19382424.5
19392624.5
19402225.6
19412025.6
19422825.6
19432725.6
19442325.6
19452725.6
19462425.6
19473625.6
19482425.6
19492525.6
19503428.3
19512828.3
19531528.3
19542928.3
19553128.3
19563328.3
First to last qualifying date each year at Rocky Mountain For each year, a bar from the first to the last day at Rocky Mountain meeting 10 mm (0.39 in). 1926: 18 February 1926 to 28 December 19261927: 4 January 1927 to 28 December 19271928: 7 January 1928 to 31 December 19281929: 11 January 1929 to 31 December 19291930: 13 January 1930 to 18 December 19301931: 26 January 1931 to 5 December 19311932: 4 January 1932 to 21 December 19321933: 6 January 1933 to 26 December 19331934: 1 January 1934 to 30 December 19341935: 6 January 1935 to 21 December 19351936: 11 January 1936 to 25 December 19361937: 1 January 1937 to 29 December 19371938: 18 January 1938 to 29 November 19381939: 1 January 1939 to 27 December 19391940: 9 January 1940 to 30 November 19401941: 9 January 1941 to 30 December 19411942: 14 January 1942 to 31 December 19421943: 5 January 1943 to 31 December 19431944: 1 January 1944 to 27 December 19441945: 1 January 1945 to 9 December 19451946: 6 January 1946 to 30 December 19461947: 2 January 1947 to 26 December 19471948: 2 January 1948 to 31 December 19481949: 4 January 1949 to 21 November 19491950: 18 January 1950 to 15 December 19501951: 8 January 1951 to 24 December 19511953: 8 January 1953 to 27 November 19531954: 17 January 1954 to 21 November 19541955: 9 January 1955 to 26 December 19551956: 20 January 1956 to 27 December 195619261930193419381942194619501955JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Rocky Mountain meeting 10 mm (0.39 in).
First to last qualifying date each year at Rocky Mountain
YearFirst dateLast date
19261926-02-181926-12-28
19271927-01-041927-12-28
19281928-01-071928-12-31
19291929-01-111929-12-31
19301930-01-131930-12-18
19311931-01-261931-12-05
19321932-01-041932-12-21
19331933-01-061933-12-26
19341934-01-011934-12-30
19351935-01-061935-12-21
19361936-01-111936-12-25
19371937-01-011937-12-29
19381938-01-181938-11-29
19391939-01-011939-12-27
19401940-01-091940-11-30
19411941-01-091941-12-30
19421942-01-141942-12-31
19431943-01-051943-12-31
19441944-01-011944-12-27
19451945-01-011945-12-09
19461946-01-061946-12-30
19471947-01-021947-12-26
19481948-01-021948-12-31
19491949-01-041949-11-21
19501950-01-181950-12-15
19511951-01-081951-12-24
19531953-01-081953-11-27
19541954-01-171954-11-21
19551955-01-091955-12-26
19561956-01-201956-12-27

Every Fixed Threshold

Fixed thresholds at Rocky Mountain
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain3036192733
25 mm (0.98 in): Days with 25 mm or more rain3018195414
50 mm (1.97 in): Days with 50 mm or more rain25719544
100 mm (3.94 in): Days with 100 mm or more rain8219281

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1926.

Download the Data

  • Data for Rocky Mountain 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 2026-10-14 (14 October 2026). Threshold counts are computed by this site.

Data as of . Last revised (2025-12-31).