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Built 2026-10-19 (19 October 2026)

Grand Portage Threshold Days by Year (USC00213296)

14 fixed thresholds counted per year at Grand Portage (USC00213296): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Grand Portage Thresholds

  • Grand Portage: days with 10 mm (0.39 in) or more of precipitation in 42 years, most in 1971 with 34.
  • Grand Portage: days with 10 cm (3.9 in) or more of snowfall in 42 years, most in 2022 with 11.
  • Grand Portage: days with 25 mm (0.98 in) or more of precipitation in 41 years, most in 2019 with 11.
  • Grand Portage: nights with a minimum temperature at or below 0 C (32 F) in 39 years, most in 2002 with 218.
  • 14 fixed thresholds have at least one qualifying day at Grand Portage.
29 years with a qualifying day
Days at or above 30 C (86 F) per year at Grand Portage Days per year at Grand Portage with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 11 in 2001. 0510151963: 21964: 11965: 11966: 31970: 61997: 21998: 31999: 72000: 32001: 112002: 32003: 32005: 32006: 72007: 42008: 22010: 12011: 42012: 52013: 22015: 32017: 12020: 32021: 52022: 32023: 12024: 22025: 12026: 41963196619982001200520082012201720222025
Days per year at Grand Portage with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 11 in 2001.
Days at or above 30 C (86 F) per year at Grand Portage
YearDaysDecade average
196321.8
196411.8
196511.8
196631.8
197066
199724
199834
199974
200034.5
2001114.5
200234.5
200334.5
200534.5
200674.5
200744.5
200824.5
201012.7
201142.7
201252.7
201322.7
201532.7
201712.7
202032.7
202152.7
202232.7
202312.7
202422.7
202512.7
202642.7
First to last qualifying date each year at Grand Portage For each year, a bar from the first to the last day at Grand Portage meeting 30 C (86 F). 1963: 1 July 1963 to 2 July 19631964: 3 August 1964 to 3 August 19641965: 14 August 1965 to 14 August 19651966: 12 July 1966 to 18 July 19661970: 29 June 1970 to 31 July 19701997: 18 July 1997 to 2 August 19971998: 14 July 1998 to 10 August 19981999: 30 May 1999 to 28 August 19992000: 10 July 2000 to 15 July 20002001: 27 June 2001 to 8 August 20012002: 15 July 2002 to 18 July 20022003: 3 July 2003 to 25 August 20032005: 21 June 2005 to 9 August 20052006: 14 July 2006 to 4 August 20062007: 30 July 2007 to 2 August 20072008: 17 August 2008 to 21 August 20082010: 4 August 2010 to 4 August 20102011: 11 July 2011 to 12 September 20112012: 29 June 2012 to 31 August 20122013: 22 August 2013 to 26 August 20132015: 26 July 2015 to 17 August 20152017: 31 July 2017 to 31 July 20172020: 27 June 2020 to 5 July 20202021: 18 June 2021 to 5 August 20212022: 1 July 2022 to 3 September 20222023: 4 September 2023 to 4 September 20232024: 15 July 2024 to 3 August 20242025: 2 July 2025 to 2 July 20252026: 3 July 2026 to 15 July 202619631970200020052010201520222026JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Grand Portage meeting 30 C (86 F).
First to last qualifying date each year at Grand Portage
YearFirst dateLast date
19631963-07-011963-07-02
19641964-08-031964-08-03
19651965-08-141965-08-14
19661966-07-121966-07-18
19701970-06-291970-07-31
19971997-07-181997-08-02
19981998-07-141998-08-10
19991999-05-301999-08-28
20002000-07-102000-07-15
20012001-06-272001-08-08
20022002-07-152002-07-18
20032003-07-032003-08-25
20052005-06-212005-08-09
20062006-07-142006-08-04
20072007-07-302007-08-02
20082008-08-172008-08-21
20102010-08-042010-08-04
20112011-07-112011-09-12
20122012-06-292012-08-31
20132013-08-222013-08-26
20152015-07-262015-08-17
20172017-07-312017-07-31
20202020-06-272020-07-05
20212021-06-182021-08-05
20222022-07-012022-09-03
20232023-09-042023-09-04
20242024-07-152024-08-03
20252025-07-022025-07-02
20262026-07-032026-07-15

Every Fixed Threshold

Fixed thresholds at Grand Portage
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days291120014
35 C (95 F): Days10n/a1
90 F (32.2 C): Days13520013
0 C (32 F): Ice days (max38116201469
0 C (32 F): Frost days (min392182002130
-10 C (14 F): Days with min39120201867
-20 C (-4 F): Days with min3965201426
-30 C (-22 F): Days with min241220142
20 C (68 F): Tropical nights (min2219701
10 mm (0.39 in): Days with 10 mm or more rain4234197114
25 mm (0.98 in): Days with 25 mm or more rain411120191
50 mm (1.97 in): Days with 50 mm or more rain25319681
10 cm (3.9 in): Days with 10 cm or more snowfall421120225
25 cm (9.8 in): Days with 25 cm or more snowfall13220091

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1963.

Download the Data

  • Data for Grand Portage 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).