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Built 2026-10-19 (19 October 2026)

Aspen 1SW Threshold Days by Year (USC00050372)

13 fixed thresholds counted per year at Aspen 1SW (USC00050372): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Aspen 1SW Thresholds

  • Aspen 1SW: days with a maximum temperature at or below 0 C (32 F) in 45 years, most in 2019 with 70.
  • Aspen 1SW: days with 10 mm (0.39 in) or more of precipitation in 44 years, most in 1984 with 31.
  • Aspen 1SW: days with 10 cm (3.9 in) or more of snowfall in 44 years, most in 1984 with 25.
  • Aspen 1SW: nights with a minimum temperature at or below 0 C (32 F) in 38 years, most in 2013 with 224.
  • 13 fixed thresholds have at least one qualifying day at Aspen 1SW.
26 years with a qualifying day
Days at or above 30 C (86 F) per year at Aspen 1SW Days per year at Aspen 1SW with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 18 in 2002. 051015201985: 31987: 31988: 61989: 91990: 61995: 21998: 52000: 42001: 12002: 182003: 182004: 42005: 62006: 12007: 62008: 12009: 12012: 12013: 12015: 12018: 42021: 12023: 22024: 12025: 22026: 13198519891998200220052008201320212025
Days per year at Aspen 1SW with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 18 in 2002.
Days at or above 30 C (86 F) per year at Aspen 1SW
YearDaysDecade average
198535.3
198735.3
198865.3
198995.3
199064.3
199524.3
199854.3
200046
200116
2002186
2003186
200446
200566
200616
200766
200816
200916
201211.8
201311.8
201511.8
201841.8
202113.8
202323.8
202413.8
202523.8
2026133.8
First to last qualifying date each year at Aspen 1SW For each year, a bar from the first to the last day at Aspen 1SW meeting 30 C (86 F). 1985: 9 June 1985 to 8 July 19851987: 23 July 1987 to 25 July 19871988: 23 June 1988 to 14 August 19881989: 19 June 1989 to 9 July 19891990: 24 June 1990 to 1 July 19901995: 29 July 1995 to 5 September 19951998: 1 July 1998 to 5 September 19982000: 15 July 2000 to 10 August 20002001: 5 July 2001 to 5 July 20012002: 25 June 2002 to 18 August 20022003: 31 May 2003 to 15 August 20032004: 8 June 2004 to 15 July 20042005: 13 July 2005 to 22 July 20052006: 17 July 2006 to 17 July 20062007: 1 July 2007 to 17 July 20072008: 2 August 2008 to 2 August 20082009: 25 July 2009 to 25 July 20092012: 1 July 2012 to 1 July 20122013: 24 July 2013 to 24 July 20132015: 27 August 2015 to 27 August 20152018: 28 June 2018 to 19 July 20182021: 10 July 2021 to 10 July 20212023: 18 July 2023 to 21 August 20232024: 3 August 2024 to 3 August 20242025: 21 August 2025 to 22 August 20252026: 13 July 2026 to 22 August 20261985199020012005200920182025JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Aspen 1SW meeting 30 C (86 F).
First to last qualifying date each year at Aspen 1SW
YearFirst dateLast date
19851985-06-091985-07-08
19871987-07-231987-07-25
19881988-06-231988-08-14
19891989-06-191989-07-09
19901990-06-241990-07-01
19951995-07-291995-09-05
19981998-07-011998-09-05
20002000-07-152000-08-10
20012001-07-052001-07-05
20022002-06-252002-08-18
20032003-05-312003-08-15
20042004-06-082004-07-15
20052005-07-132005-07-22
20062006-07-172006-07-17
20072007-07-012007-07-17
20082008-08-022008-08-02
20092009-07-252009-07-25
20122012-07-012012-07-01
20132013-07-242013-07-24
20152015-08-272015-08-27
20182018-06-282018-07-19
20212021-07-102021-07-10
20232023-07-182023-08-21
20242024-08-032024-08-03
20252025-08-212025-08-22
20262026-07-132026-08-22

Every Fixed Threshold

Fixed thresholds at Aspen 1SW
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days2618200213
90 F (32.2 C): Days2319891
0 C (32 F): Ice days (max4570201919
0 C (32 F): Frost days (min382242013113
-10 C (14 F): Days with min38104199225
-20 C (-4 F): Days with min362019923
-30 C (-22 F): Days with min3219891
10 mm (0.39 in): Days with 10 mm or more rain443119848
25 mm (0.98 in): Days with 25 mm or more rain30419851
50 mm (1.97 in): Days with 50 mm or more rain2119841
10 cm (3.9 in): Days with 10 cm or more snowfall4425198411
25 cm (9.8 in): Days with 25 cm or more snowfall32419813
50 cm (19.7 in): Days with 50 cm or more snowfall2119961

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1985.

Download the Data

  • Data for Aspen 1SW 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).