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Data as of 2026-10-17
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Built 2026-10-18 (18 October 2026)

Boulder Mountain Threshold Days by Year

9 fixed thresholds counted per year at Boulder Mountain (USS0011C01S): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Boulder Mountain Thresholds

  • Boulder Mountain: days with 10 mm (0.39 in) or more of precipitation in 48 years, most in 1996 with 48.
  • Boulder Mountain: days with 25 mm (0.98 in) or more of precipitation in 48 years, most in 1983 with 8.
  • Boulder Mountain: days with a maximum temperature at or below 0 C (32 F) in 36 years, most in 2002 with 144.
  • Boulder Mountain: nights with a minimum temperature at or below 0 C (32 F) in 35 years, most in 1995 with 251.
  • 9 fixed thresholds have at least one qualifying day at Boulder Mountain.
6 years with a qualifying day
Days at or above 30 C (86 F) per year at Boulder Mountain Days per year at Boulder Mountain with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 3 in 2007. 01231991: 12002: 22003: 12007: 32018: 12021: 1199120022003200720182021
Days per year at Boulder Mountain with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 3 in 2007.
Days at or above 30 C (86 F) per year at Boulder Mountain
YearDaysDecade average
199111
200222
200312
200732
201811
202111
First to last qualifying date each year at Boulder Mountain For each year, a bar from the first to the last day at Boulder Mountain meeting 30 C (86 F). 1991: 10 August 1991 to 10 August 19912002: 12 July 2002 to 13 July 20022003: 10 August 2003 to 10 August 20032007: 6 July 2007 to 23 July 20072018: 11 August 2018 to 11 August 20182021: 14 June 2021 to 14 June 2021199120022003200720182021JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Boulder Mountain meeting 30 C (86 F).
First to last qualifying date each year at Boulder Mountain
YearFirst dateLast date
19911991-08-101991-08-10
20022002-07-122002-07-13
20032003-08-102003-08-10
20072007-07-062007-07-23
20182018-08-112018-08-11
20212021-06-142021-06-14

Every Fixed Threshold

Fixed thresholds at Boulder Mountain
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days6320071
0 C (32 F): Ice days (max36144200263
0 C (32 F): Frost days (min352511995143
-10 C (14 F): Days with min35104199633
-20 C (-4 F): Days with min352419963
-30 C (-22 F): Days with min15520225
10 mm (0.39 in): Days with 10 mm or more rain4848199628
25 mm (0.98 in): Days with 25 mm or more rain48819837
50 mm (1.97 in): Days with 50 mm or more rain13219821

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1991.

Download the Data

  • Data for Boulder 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 2026-10-17 (17 October 2026). Threshold counts are computed by this site.

Data as of . Last revised (2026-10-17).