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Data as of 2025-12-31
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Built 2026-10-19 (19 October 2026)

Aspen Threshold Days by Year (USC00050370)

13 fixed thresholds counted per year at Aspen (USC00050370): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Aspen Thresholds

  • Aspen: nights with a minimum temperature at or below 0 C (32 F) in 47 years, most in 1939 with 252.
  • Aspen: nights with a minimum temperature at or below -10 C (14 F) in 47 years, most in 1943 with 122.
  • Aspen: nights with a minimum temperature at or below -20 C (-4 F) in 47 years, most in 1952 with 30.
  • Aspen: days with a maximum temperature at or below 0 C (32 F) in 45 years, most in 1964 with 71.
  • 13 fixed thresholds have at least one qualifying day at Aspen.
32 years with a qualifying day
Days at or above 30 C (86 F) per year at Aspen Days per year at Aspen with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 18 in 1940. 051015201914: 11918: 61935: 51936: 141938: 41939: 151940: 181941: 41943: 71944: 101946: 61947: 81952: 11954: 111955: 21958: 81959: 101960: 141962: 31963: 121964: 61966: 71968: 21969: 81970: 101971: 101972: 61973: 11974: 61975: 31976: 91977: 819141938194319521959196419701974
Days per year at Aspen with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 18 in 1940.
Days at or above 30 C (86 F) per year at Aspen
YearDaysDecade average
191413.5
191863.5
193559.5
1936149.5
193849.5
1939159.5
1940188.8
194148.8
194378.8
1944108.8
194668.8
194788.8
195216.4
1954116.4
195526.4
195886.4
1959106.4
1960147.4
196237.4
1963127.4
196467.4
196677.4
196827.4
196987.4
1970106.6
1971106.6
197266.6
197316.6
197466.6
197536.6
197696.6
197786.6
First to last qualifying date each year at Aspen For each year, a bar from the first to the last day at Aspen meeting 30 C (86 F). 1914: 3 September 1914 to 3 September 19141918: 10 June 1918 to 1 August 19181935: 25 July 1935 to 12 August 19351936: 18 June 1936 to 26 August 19361938: 31 July 1938 to 5 August 19381939: 9 July 1939 to 23 August 19391940: 17 June 1940 to 17 August 19401941: 24 July 1941 to 6 August 19411943: 23 June 1943 to 29 July 19431944: 12 July 1944 to 21 September 19441946: 22 July 1946 to 10 August 19461947: 26 July 1947 to 7 August 19471952: 23 July 1952 to 23 July 19521954: 22 June 1954 to 30 August 19541955: 9 July 1955 to 10 July 19551958: 10 July 1958 to 14 August 19581959: 9 June 1959 to 12 August 19591960: 27 June 1960 to 4 September 19601962: 11 July 1962 to 15 August 19621963: 27 June 1963 to 31 July 19631964: 7 July 1964 to 27 July 19641966: 6 July 1966 to 16 August 19661968: 18 July 1968 to 21 July 19681969: 16 July 1969 to 26 August 19691970: 26 June 1970 to 13 August 19701971: 24 June 1971 to 17 August 19711972: 14 July 1972 to 13 August 19721973: 6 July 1973 to 6 July 19731974: 22 June 1974 to 14 July 19741975: 1 July 1975 to 7 August 19751976: 5 July 1976 to 31 July 19761977: 18 June 1977 to 7 August 197719141938194319521959196419701974JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Aspen meeting 30 C (86 F).
First to last qualifying date each year at Aspen
YearFirst dateLast date
19141914-09-031914-09-03
19181918-06-101918-08-01
19351935-07-251935-08-12
19361936-06-181936-08-26
19381938-07-311938-08-05
19391939-07-091939-08-23
19401940-06-171940-08-17
19411941-07-241941-08-06
19431943-06-231943-07-29
19441944-07-121944-09-21
19461946-07-221946-08-10
19471947-07-261947-08-07
19521952-07-231952-07-23
19541954-06-221954-08-30
19551955-07-091955-07-10
19581958-07-101958-08-14
19591959-06-091959-08-12
19601960-06-271960-09-04
19621962-07-111962-08-15
19631963-06-271963-07-31
19641964-07-071964-07-27
19661966-07-061966-08-16
19681968-07-181968-07-21
19691969-07-161969-08-26
19701970-06-261970-08-13
19711971-06-241971-08-17
19721972-07-141972-08-13
19731973-07-061973-07-06
19741974-06-221974-07-14
19751975-07-011975-08-07
19761976-07-051976-07-31
19771977-06-181977-08-07

Every Fixed Threshold

Fixed thresholds at Aspen
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days321819408
90 F (32.2 C): Days9519541
0 C (32 F): Ice days (max4571196436
0 C (32 F): Frost days (min472521939167
-10 C (14 F): Days with min47122194366
-20 C (-4 F): Days with min473019521
-30 C (-22 F): Days with min12319432
10 mm (0.39 in): Days with 10 mm or more rain4525194310
25 mm (0.98 in): Days with 25 mm or more rain20319352
50 mm (1.97 in): Days with 50 mm or more rain2119351
10 cm (3.9 in): Days with 10 cm or more snowfall412119368
25 cm (9.8 in): Days with 25 cm or more snowfall23519361
50 cm (19.7 in): Days with 50 cm or more snowfall1119651

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1914.

Download the Data

  • Data for Aspen 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).