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Data as of 2025-12-31
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Built 2026-10-18 (18 October 2026)

Blackduck Threshold Days by Year

15 fixed thresholds counted per year at Blackduck (USC00210809): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Blackduck Thresholds

  • Blackduck: days with a maximum temperature at or above 30 C (86 F) in 18 years, most in 2012 with 17.
  • Blackduck: days with a maximum temperature at or below 0 C (32 F) in 18 years, most in 2014 with 115.
  • Blackduck: days with 10 cm (3.9 in) or more of snowfall in 18 years, most in 2008 with 7.
  • Blackduck: days with a maximum temperature at or above 90 F (32.2 C) in 12 years, most in 2006 with 6.
  • 15 fixed thresholds have at least one qualifying day at Blackduck.
18 years with a qualifying day
Days at or above 30 C (86 F) per year at Blackduck Days per year at Blackduck with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 17 in 2012. 051015201991: 121994: 12001: 142002: 112004: 32005: 152006: 132007: 142008: 12009: 12010: 52011: 92012: 172014: 22015: 42016: 142017: 32019: 4199120012004200620082010201220152017
Days per year at Blackduck with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 17 in 2012.
Days at or above 30 C (86 F) per year at Blackduck
YearDaysDecade average
1991126.5
199416.5
2001149
2002119
200439
2005159
2006139
2007149
200819
200919
201057.3
201197.3
2012177.3
201427.3
201547.3
2016147.3
201737.3
201947.3
First to last qualifying date each year at Blackduck For each year, a bar from the first to the last day at Blackduck meeting 30 C (86 F). 1991: 15 May 1991 to 29 August 19911994: 15 June 1994 to 15 June 19942001: 26 June 2001 to 23 August 20012002: 31 May 2002 to 9 September 20022004: 29 April 2004 to 22 July 20042005: 21 June 2005 to 9 August 20052006: 30 May 2006 to 28 August 20062007: 5 July 2007 to 6 September 20072008: 18 August 2008 to 18 August 20082009: 13 August 2009 to 13 August 20092010: 31 May 2010 to 10 August 20102011: 11 July 2011 to 10 September 20112012: 19 May 2012 to 1 September 20122014: 12 July 2014 to 16 August 20142015: 26 June 2015 to 16 August 20152016: 6 May 2016 to 10 August 20162017: 6 July 2017 to 29 August 20172019: 31 May 2019 to 4 August 2019199120022006200920122016JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Blackduck meeting 30 C (86 F).
First to last qualifying date each year at Blackduck
YearFirst dateLast date
19911991-05-151991-08-29
19941994-06-151994-06-15
20012001-06-262001-08-23
20022002-05-312002-09-09
20042004-04-292004-07-22
20052005-06-212005-08-09
20062006-05-302006-08-28
20072007-07-052007-09-06
20082008-08-182008-08-18
20092009-08-132009-08-13
20102010-05-312010-08-10
20112011-07-112011-09-10
20122012-05-192012-09-01
20142014-07-122014-08-16
20152015-06-262015-08-16
20162016-05-062016-08-10
20172017-07-062017-08-29
20192019-05-312019-08-04

Every Fixed Threshold

Fixed thresholds at Blackduck
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days181720124
35 C (95 F): Days1120121
90 F (32.2 C): Days12620061
0 C (32 F): Ice days (max181152014113
0 C (32 F): Frost days (min81931991178
-10 C (14 F): Days with min8113201493
-20 C (-4 F): Days with min880201458
-30 C (-22 F): Days with min827201423
-40 C (-40 F): Days with min1220172
20 C (68 F): Tropical nights (min3520075
10 mm (0.39 in): Days with 10 mm or more rain525201019
25 mm (0.98 in): Days with 25 mm or more rain51120105
50 mm (1.97 in): Days with 50 mm or more rain3320103
10 cm (3.9 in): Days with 10 cm or more snowfall18720082
25 cm (9.8 in): Days with 25 cm or more snowfall2220102

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 Blackduck 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 2026-10-16 (16 October 2026). Threshold counts are computed by this site.

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