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

Zortman Mine Montana Threshold Days by Year (USR0000MZOR)

10 fixed thresholds counted per year at Zortman Mine Montana (USR0000MZOR): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Zortman Mine Montana Thresholds

  • Zortman Mine Montana: days with a maximum temperature at or below 0 C (32 F) in 28 years, most in 1996 with 87.
  • Zortman Mine Montana: nights with a minimum temperature at or below 0 C (32 F) in 28 years, most in 2002 with 181.
  • Zortman Mine Montana: nights with a minimum temperature at or below -10 C (14 F) in 28 years, most in 1996 with 77.
  • Zortman Mine Montana: nights with a minimum temperature at or below -20 C (-4 F) in 28 years, most in 1996 with 38.
  • 10 fixed thresholds have at least one qualifying day at Zortman Mine Montana.
27 years with a qualifying day
Days at or above 30 C (86 F) per year at Zortman Mine Montana Days per year at Zortman Mine Montana with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 33 in 2003. 0102030401988: 181989: 41990: 101991: 61992: 41994: 101995: 61996: 141997: 41998: 201999: 122000: 202001: 192002: 112003: 332004: 72005: 192006: 222007: 282008: 142009: 112010: 102011: 162012: 282013: 152014: 92015: 14198819911995199820012004200720102013
Days per year at Zortman Mine Montana with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 33 in 2003.
Days at or above 30 C (86 F) per year at Zortman Mine Montana
YearDaysDecade average
19881811
1989411
1990109.6
199169.6
199249.6
1994109.6
199569.6
1996149.6
199749.6
1998209.6
1999129.6
20002018.4
20011918.4
20021118.4
20033318.4
2004718.4
20051918.4
20062218.4
20072818.4
20081418.4
20091118.4
20101015.3
20111615.3
20122815.3
20131515.3
2014915.3
20151415.3
First to last qualifying date each year at Zortman Mine Montana For each year, a bar from the first to the last day at Zortman Mine Montana meeting 30 C (86 F). 1988: 4 June 1988 to 11 August 19881989: 7 July 1989 to 1 August 19891990: 24 June 1990 to 5 September 19901991: 29 July 1991 to 31 August 19911992: 10 June 1992 to 1 October 19921994: 24 July 1994 to 8 September 19941995: 8 July 1995 to 3 September 19951996: 8 June 1996 to 28 August 19961997: 4 August 1997 to 27 August 19971998: 16 July 1998 to 16 September 19981999: 23 July 1999 to 30 August 19992000: 30 June 2000 to 17 September 20002001: 4 July 2001 to 3 September 20012002: 27 June 2002 to 15 September 20022003: 19 June 2003 to 7 September 20032004: 14 July 2004 to 1 September 20042005: 22 June 2005 to 9 September 20052006: 28 June 2006 to 29 August 20062007: 29 June 2007 to 4 September 20072008: 30 June 2008 to 25 August 20082009: 22 July 2009 to 19 September 20092010: 29 June 2010 to 26 August 20102011: 3 July 2011 to 24 September 20112012: 26 June 2012 to 9 September 20122013: 2 July 2013 to 5 September 20132014: 17 July 2014 to 25 September 20142015: 27 June 2015 to 25 September 20151988199219972001200520092013JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Zortman Mine Montana meeting 30 C (86 F).
First to last qualifying date each year at Zortman Mine Montana
YearFirst dateLast date
19881988-06-041988-08-11
19891989-07-071989-08-01
19901990-06-241990-09-05
19911991-07-291991-08-31
19921992-06-101992-10-01
19941994-07-241994-09-08
19951995-07-081995-09-03
19961996-06-081996-08-28
19971997-08-041997-08-27
19981998-07-161998-09-16
19991999-07-231999-08-30
20002000-06-302000-09-17
20012001-07-042001-09-03
20022002-06-272002-09-15
20032003-06-192003-09-07
20042004-07-142004-09-01
20052005-06-222005-09-09
20062006-06-282006-08-29
20072007-06-292007-09-04
20082008-06-302008-08-25
20092009-07-222009-09-19
20102010-06-292010-08-26
20112011-07-032011-09-24
20122012-06-262012-09-09
20132013-07-022013-09-05
20142014-07-172014-09-25
20152015-06-272015-09-25

Every Fixed Threshold

Fixed thresholds at Zortman Mine Montana
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days2733200314
35 C (95 F): Days10520031
90 F (32.2 C): Days231820033
0 C (32 F): Ice days (max2887199636
0 C (32 F): Frost days (min281812002124
-10 C (14 F): Days with min2877199643
-20 C (-4 F): Days with min283819967
-30 C (-22 F): Days with min11719902
20 C (68 F): Tropical nights (min2816200311
25 C (77 F): Days with min2220072

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1988.

Download the Data

  • Data for Zortman Mine Montana 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).