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Built 2026-10-19 (19 October 2026)

Boulder Rearing STN Threshold Days by Year (USC00480951)

13 fixed thresholds counted per year at Boulder Rearing STN (USC00480951): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Boulder Rearing STN Thresholds

  • Boulder Rearing STN: days with a maximum temperature at or below 0 C (32 F) in 37 years, most in 2019 with 98.
  • Boulder Rearing STN: nights with a minimum temperature at or below 0 C (32 F) in 37 years, most in 2010 with 270.
  • Boulder Rearing STN: nights with a minimum temperature at or below -10 C (14 F) in 37 years, most in 2011 with 160.
  • Boulder Rearing STN: nights with a minimum temperature at or below -20 C (-4 F) in 37 years, most in 2019 with 79.
  • 13 fixed thresholds have at least one qualifying day at Boulder Rearing STN.
36 years with a qualifying day
Days at or above 30 C (86 F) per year at Boulder Rearing STN Days per year at Boulder Rearing STN with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 38 in 2021. 0102030401990: 161991: 61992: 71994: 141995: 41996: 51997: 51998: 111999: 32000: 172001: 172002: 182003: 312004: 32005: 142006: 202007: 322008: 122009: 22010: 52011: 62012: 192013: 212014: 62015: 172016: 142017: 142018: 172019: 162020: 192021: 382022: 262023: 152024: 162025: 152026: 28199019951999200320072011201520192023
Days per year at Boulder Rearing STN with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 38 in 2021.
Days at or above 30 C (86 F) per year at Boulder Rearing STN
YearDaysDecade average
1990167.9
199167.9
199277.9
1994147.9
199547.9
199657.9
199757.9
1998117.9
199937.9
20001716.6
20011716.6
20021816.6
20033116.6
2004316.6
20051416.6
20062016.6
20073216.6
20081216.6
2009216.6
2010513.5
2011613.5
20121913.5
20132113.5
2014613.5
20151713.5
20161413.5
20171413.5
20181713.5
20191613.5
20201922.4
20213822.4
20222622.4
20231522.4
20241622.4
20251522.4
20262822.4
First to last qualifying date each year at Boulder Rearing STN For each year, a bar from the first to the last day at Boulder Rearing STN meeting 30 C (86 F). 1990: 24 June 1990 to 13 September 19901991: 14 July 1991 to 1 September 19911992: 4 August 1992 to 16 August 19921994: 26 June 1994 to 27 August 19941995: 29 July 1995 to 2 September 19951996: 3 July 1996 to 14 August 19961997: 16 July 1997 to 4 August 19971998: 14 July 1998 to 5 September 19981999: 8 July 1999 to 28 July 19992000: 14 July 2000 to 16 August 20002001: 23 June 2001 to 29 August 20012002: 26 June 2002 to 17 July 20022003: 30 May 2003 to 22 August 20032004: 13 July 2004 to 18 July 20042005: 22 June 2005 to 31 August 20052006: 7 June 2006 to 23 August 20062007: 23 June 2007 to 31 August 20072008: 5 July 2008 to 26 August 20082009: 24 July 2009 to 23 August 20092010: 17 July 2010 to 27 August 20102011: 4 July 2011 to 31 July 20112012: 5 June 2012 to 29 August 20122013: 11 June 2013 to 1 September 20132014: 7 July 2014 to 4 August 20142015: 25 June 2015 to 26 August 20152016: 21 June 2016 to 2 August 20162017: 6 July 2017 to 5 September 20172018: 6 July 2018 to 13 August 20182019: 12 July 2019 to 6 September 20192020: 18 July 2020 to 7 September 20202021: 4 June 2021 to 10 September 20212022: 9 July 2022 to 8 September 20222023: 5 July 2023 to 19 August 20232024: 24 June 2024 to 7 August 20242025: 20 June 2025 to 23 August 20252026: 6 July 2026 to 22 August 202619901996200120062011201620212026JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Boulder Rearing STN meeting 30 C (86 F).
First to last qualifying date each year at Boulder Rearing STN
YearFirst dateLast date
19901990-06-241990-09-13
19911991-07-141991-09-01
19921992-08-041992-08-16
19941994-06-261994-08-27
19951995-07-291995-09-02
19961996-07-031996-08-14
19971997-07-161997-08-04
19981998-07-141998-09-05
19991999-07-081999-07-28
20002000-07-142000-08-16
20012001-06-232001-08-29
20022002-06-262002-07-17
20032003-05-302003-08-22
20042004-07-132004-07-18
20052005-06-222005-08-31
20062006-06-072006-08-23
20072007-06-232007-08-31
20082008-07-052008-08-26
20092009-07-242009-08-23
20102010-07-172010-08-27
20112011-07-042011-07-31
20122012-06-052012-08-29
20132013-06-112013-09-01
20142014-07-072014-08-04
20152015-06-252015-08-26
20162016-06-212016-08-02
20172017-07-062017-09-05
20182018-07-062018-08-13
20192019-07-122019-09-06
20202020-07-182020-09-07
20212021-06-042021-09-10
20222022-07-092022-09-08
20232023-07-052023-08-19
20242024-06-242024-08-07
20252025-06-202025-08-23
20262026-07-062026-08-22

Every Fixed Threshold

Fixed thresholds at Boulder Rearing STN
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days3638202128
35 C (95 F): Days10n/a3
90 F (32.2 C): Days2113200313
0 C (32 F): Ice days (max379820199
0 C (32 F): Frost days (min372702010169
-10 C (14 F): Days with min37160201157
-20 C (-4 F): Days with min377920197
-30 C (-22 F): Days with min351819908
-40 C (-40 F): Days with min3419901
10 mm (0.39 in): Days with 10 mm or more rain371219952
25 mm (0.98 in): Days with 25 mm or more rain7219931
10 cm (3.9 in): Days with 10 cm or more snowfall29619963
25 cm (9.8 in): Days with 25 cm or more snowfall2119951

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1990.

Download the Data

  • Data for Boulder Rearing STN 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).