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Data as of 2025-12-31
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Built 2026-10-19 (19 October 2026)

Great Falls WFO Threshold Days by Year (USC00243753)

15 fixed thresholds counted per year at Great Falls WFO (USC00243753): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Great Falls WFO Thresholds

  • Great Falls WFO: days with a maximum temperature at or above 30 C (86 F) in 24 years, most in 2021 with 54.
  • Great Falls WFO: days with a maximum temperature at or above 90 F (32.2 C) in 24 years, most in 2022 with 35.
  • Great Falls WFO: days with a maximum temperature at or below 0 C (32 F) in 24 years, most in 2019 with 63.
  • Great Falls WFO: nights with a minimum temperature at or below 0 C (32 F) in 24 years, most in 2000 with 174.
  • 15 fixed thresholds have at least one qualifying day at Great Falls WFO.
24 years with a qualifying day
Days at or above 30 C (86 F) per year at Great Falls WFO Days per year at Great Falls WFO with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 54 in 2021. 02040601998: 441999: 182000: 422001: 452003: 462006: 442007: 472008: 292010: 212011: 402012: 442013: 442014: 282015: 362016: 292017: 472018: 292019: 262020: 362021: 542022: 532023: 312024: 412025: 3619982001200720112014201720202023
Days per year at Great Falls WFO with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 54 in 2021.
Days at or above 30 C (86 F) per year at Great Falls WFO
YearDaysDecade average
19984431
19991831
20004242.2
20014542.2
20034642.2
20064442.2
20074742.2
20082942.2
20102134.4
20114034.4
20124434.4
20134434.4
20142834.4
20153634.4
20162934.4
20174734.4
20182934.4
20192634.4
20203641.8
20215441.8
20225341.8
20233141.8
20244141.8
20253641.8
First to last qualifying date each year at Great Falls WFO For each year, a bar from the first to the last day at Great Falls WFO meeting 30 C (86 F). 1998: 8 July 1998 to 17 September 19981999: 25 May 1999 to 23 September 19992000: 5 June 2000 to 17 September 20002001: 12 May 2001 to 31 August 20012003: 29 May 2003 to 7 September 20032006: 16 May 2006 to 29 August 20062007: 20 June 2007 to 3 September 20072008: 21 June 2008 to 19 September 20082010: 28 June 2010 to 3 October 20102011: 28 June 2011 to 3 October 20112012: 15 May 2012 to 18 September 20122013: 28 June 2013 to 16 September 20132014: 3 July 2014 to 25 September 20142015: 8 June 2015 to 25 September 20152016: 7 June 2016 to 1 September 20162017: 5 May 2017 to 11 September 20172018: 9 June 2018 to 7 September 20182019: 13 July 2019 to 15 September 20192020: 12 June 2020 to 12 September 20202021: 2 June 2021 to 26 September 20212022: 17 June 2022 to 28 September 20222023: 30 June 2023 to 17 September 20232024: 14 June 2024 to 25 September 20242025: 10 May 2025 to 29 September 202519982001200720112014201720202023JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Great Falls WFO meeting 30 C (86 F).
First to last qualifying date each year at Great Falls WFO
YearFirst dateLast date
19981998-07-081998-09-17
19991999-05-251999-09-23
20002000-06-052000-09-17
20012001-05-122001-08-31
20032003-05-292003-09-07
20062006-05-162006-08-29
20072007-06-202007-09-03
20082008-06-212008-09-19
20102010-06-282010-10-03
20112011-06-282011-10-03
20122012-05-152012-09-18
20132013-06-282013-09-16
20142014-07-032014-09-25
20152015-06-082015-09-25
20162016-06-072016-09-01
20172017-05-052017-09-11
20182018-06-092018-09-07
20192019-07-132019-09-15
20202020-06-122020-09-12
20212021-06-022021-09-26
20222022-06-172022-09-28
20232023-06-302023-09-17
20242024-06-142024-09-25
20252025-05-102025-09-29

Every Fixed Threshold

Fixed thresholds at Great Falls WFO
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days2454202136
35 C (95 F): Days231320073
90 F (32.2 C): Days2435202216
100 F (37.8 C): Days8420032
0 C (32 F): Ice days (max2463201943
0 C (32 F): Frost days (min241742000137
-10 C (14 F): Days with min2464201845
-20 C (-4 F): Days with min2428201920
-30 C (-22 F): Days with min14620083
20 C (68 F): Tropical nights (min8620071
10 mm (0.39 in): Days with 10 mm or more rain241420067
25 mm (0.98 in): Days with 25 mm or more rain18320061
50 mm (1.97 in): Days with 50 mm or more rain2120141
10 cm (3.9 in): Days with 10 cm or more snowfall231020191
25 cm (9.8 in): Days with 25 cm or more snowfall2220101

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1998.

Download the Data

  • Data for Great Falls WFO 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 (2025-12-31).