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Built 2026-10-14 (14 October 2026)

Big Sheep Mountain Montana Weather Records (USR0000MBSM)

Record envelope, standing records and threshold days for Big Sheep Mountain Montana (USR0000MBSM), Montana, United States, with 39 years of record.

Key Facts for Big Sheep Mountain Montana

  • Big Sheep Mountain Montana (USR0000MBSM) is a weather station in Montana, United States at 47.02 latitude and -105.82 longitude, 975 m (3,200 ft) above sea level.
  • The station reports from 1985 to 2023, 39 years of record.
  • 1,464 records set at Big Sheep Mountain Montana still stand.
  • Records are tracked for tmax, tmin: an element needs 30 years of data to be eligible.
  • Big Sheep Mountain Montana tied a daily record high maximum temperature of 28.3 C (82.9 F) on 9 October 2026 (provisional).

Provisional Records

Records set in the last 60 days are provisional until they clear the revision window.

About the Station

  • Location: Montana, United States, 47.02 latitude, -105.82 longitude.
  • Elevation: 975 m (3,200 ft).
  • Period of record: 1985 to 2023, 39 years.
  • Eligible elements: tmax, tmin.

Daily Record Envelope and 2026

27 days at or beyond a record
Daily record high and record low at Big Sheep Mountain Montana, with 2026 drawn through them The band shows the record high and record low for each calendar day at Big Sheep Mountain Montana. The lines show the 2026 daily maximum and minimum. 27 days in 2026 matched or passed a record. Temperatures are in degrees Celsius. -40-200204060 JanFebMarAprMayJunJulAugSepOctNovDec
The band shows the record high and record low for each calendar day at Big Sheep Mountain Montana. The lines show the 2026 daily maximum and minimum. 27 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Big Sheep Mountain Montana, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan17.8 C (64.0 F)-37.2 C (-35.0 F)12.2 C (54.0 F)-31.7 C (-25.1 F)
Feb20.6 C (69.1 F)-35.6 C (-32.1 F)17.2 C (63.0 F)-21.1 C (-6.0 F)
Mar27.2 C (81.0 F)-32.2 C (-26.0 F)25.0 C (77.0 F)-15.0 C (5.0 F)
Apr30.0 C (86.0 F)-16.7 C (1.9 F)28.9 C (84.0 F)-8.9 C (16.0 F)
May35.6 C (96.1 F)-6.1 C (21.0 F)32.8 C (91.0 F)-3.3 C (26.1 F)
Jun40.6 C (105.1 F)0.0 C (32.0 F)31.1 C (88.0 F)5.6 C (42.1 F)
Jul43.9 C (111.0 F)4.4 C (39.9 F)43.9 C (111.0 F)12.2 C (54.0 F)
Aug40.0 C (104.0 F)3.3 C (37.9 F)39.4 C (102.9 F)8.3 C (46.9 F)
Sep42.2 C (108.0 F)-7.2 C (19.0 F)34.4 C (93.9 F)5.0 C (41.0 F)
Oct33.3 C (91.9 F)-19.4 C (-2.9 F)28.3 C (82.9 F)3.9 C (39.0 F)
Nov25.0 C (77.0 F)-29.4 C (-20.9 F)n/an/a
Dec20.6 C (69.1 F)-38.3 C (-36.9 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Big Sheep Mountain Montana by the year they were set 1,464 records at Big Sheep Mountain Montana still stand. 1985 holds the most, with 82. 02550751001985: 821986: 511987: 531988: 551989: 421990: 391991: 541992: 691993: 371994: 241995: 401996: 501997: 381998: 251999: 322000: 222001: 242002: 442003: 532004: 302005: 372006: 332007: 232008: 282009: 272010: 112011: 192012: 422013: 242014: 252015: 282016: 162017: 282018: 242019: 242020: 412021: 442022: 222023: 202024: 272025: 162026: 41198519901995200020052010201520202025
1,464 records at Big Sheep Mountain Montana still stand. 1985 holds the most, with 82.
Standing records at Big Sheep Mountain Montana by the year they were set
Year setStanding records
198582
198651
198753
198855
198942
199039
199154
199269
199337
199424
199540
199650
199738
199825
199932
200022
200124
200244
200353
200430
200537
200633
200723
200828
200927
201011
201119
201242
201324
201425
201528
201616
201728
201824
201924
202041
202144
202222
202320
202427
202516
202641

All-Time Record Progression

1 new records
When Big Sheep Mountain Montana set new all-time records 1 all-time records were set at Big Sheep Mountain Montana between 12 July 2026 and 12 July 2026. Each dot is a new record. Record high maximum temperature12 July 2026: Record high maximum temperature 43.9 C (111.0 F)
1 all-time records were set at Big Sheep Mountain Montana between 12 July 2026 and 12 July 2026. Each dot is a new record.
When Big Sheep Mountain Montana set new all-time records
DateKindDetail
2026-07-12Record high maximum temperatureRecord high maximum temperature 43.9 C (111.0 F)

Period of Record Coverage

1985 to 2026
Days with data per year at Big Sheep Mountain Montana 42 years of record at Big Sheep Mountain Montana, 1985 to 2026. 4 years have data for under 90 percent of days and are left out of rankings: 1985, 1993, 2025, 2026. 1985: 304 of 365 days1986: 351 of 365 days1987: 351 of 365 days1988: 352 of 366 days1989: 359 of 365 days1990: 351 of 365 days1991: 332 of 365 days1992: 358 of 366 days1993: 302 of 365 days1994: 359 of 365 days1995: 358 of 365 days1996: 359 of 366 days1997: 360 of 365 days1998: 361 of 365 days1999: 364 of 365 days2000: 365 of 366 days2001: 365 of 365 days2002: 362 of 365 days2003: 361 of 365 days2004: 361 of 366 days2005: 363 of 365 days2006: 360 of 365 days2007: 361 of 365 days2008: 362 of 366 days2009: 363 of 365 days2010: 361 of 365 days2011: 362 of 365 days2012: 362 of 366 days2013: 363 of 365 days2014: 359 of 365 days2015: 363 of 365 days2016: 363 of 366 days2017: 361 of 365 days2018: 362 of 365 days2019: 359 of 365 days2020: 361 of 366 days2021: 362 of 365 days2022: 357 of 365 days2023: 361 of 365 days2024: 363 of 366 days2025: 301 of 365 days2026: 282 of 365 days1990200020102020
42 years of record at Big Sheep Mountain Montana, 1985 to 2026. 4 years have data for under 90 percent of days and are left out of rankings: 1985, 1993, 2025, 2026.
Days with data per year at Big Sheep Mountain Montana
YearDays with dataShare of yearComplete
198530483%No
198635196%Yes
198735196%Yes
198835296%Yes
198935998%Yes
199035196%Yes
199133291%Yes
199235898%Yes
199330283%No
199435998%Yes
199535898%Yes
199635998%Yes
199736099%Yes
199836199%Yes
1999364100%Yes
2000365100%Yes
2001365100%Yes
200236299%Yes
200336199%Yes
200436199%Yes
200536399%Yes
200636099%Yes
200736199%Yes
200836299%Yes
200936399%Yes
201036199%Yes
201136299%Yes
201236299%Yes
201336399%Yes
201435998%Yes
201536399%Yes
201636399%Yes
201736199%Yes
201836299%Yes
201935998%Yes
202036199%Yes
202136299%Yes
202235798%Yes
202336199%Yes
202436399%Yes
202530182%No
202628277%No

Latest Records

20
Latest records at Big Sheep Mountain Montana
DateStationRecordValueBeat old record byOld record stoodSignificance
9 October 2026Big Sheep Mountain Montana, USdaily high max (Tie, Provisional)28.3 C (82.9 F)tie1 year1 of 100 (Routine)
20 September 2026Big Sheep Mountain Montana, USdaily high min (Tie, Provisional)11.7 C (53.1 F)tie17 years2 of 100 (Routine)
29 August 2026Big Sheep Mountain Montana, USdaily high min (Provisional)20.0 C (68.0 F)1.7 C (3.1 F)39 years19 of 100 (Routine)
4 August 2026Big Sheep Mountain Montana, USdaily low min8.3 C (46.9 F)0.6 C (1.1 F)8 years7 of 100 (Routine)
1 August 2026Big Sheep Mountain Montana, USdaily high max39.4 C (102.9 F)1.1 C (2.0 F)17 years11 of 100 (Routine)
29 July 2026Big Sheep Mountain Montana, USdaily high min20.6 C (69.1 F)0.6 C (1.1 F)39 years16 of 100 (Routine)
27 July 2026Big Sheep Mountain Montana, USdaily high min23.3 C (73.9 F)2.4 C (4.3 F)4 years12 of 100 (Routine)
26 July 2026Big Sheep Mountain Montana, USdaily high min22.2 C (72.0 F)1.1 C (2.0 F)20 years13 of 100 (Routine)
25 July 2026Big Sheep Mountain Montana, USdaily high max41.1 C (106.0 F)3.3 C (5.9 F)1 year10 of 100 (Routine)
14 July 2026Big Sheep Mountain Montana, USdaily high min22.2 C (72.0 F)1.1 C (2.0 F)25 years14 of 100 (Routine)
13 July 2026Big Sheep Mountain Montana, USdaily high min22.8 C (73.0 F)2.2 C (4.0 F)25 years17 of 100 (Routine)
12 July 2026Big Sheep Mountain Montana, USall-time high max43.9 C (111.0 F)1.7 C (3.1 F)38 years38 of 100 (Notable)
12 July 2026Big Sheep Mountain Montana, USdaily high min23.9 C (75.0 F)2.8 C (5.0 F)1 year12 of 100 (Routine)
11 July 2026Big Sheep Mountain Montana, USdaily high min25.0 C (77.0 F)4.4 C (7.9 F)1 year17 of 100 (Routine)
11 July 2026Big Sheep Mountain Montana, USdaily high max38.3 C (100.9 F)1.6 C (2.9 F)4 years8 of 100 (Routine)
30 May 2026Big Sheep Mountain Montana, USdaily high min (Tie)15.0 C (59.0 F)tie37 years3 of 100 (Routine)
28 May 2026Big Sheep Mountain Montana, USdaily high min18.3 C (64.9 F)3.3 C (5.9 F)8 years13 of 100 (Routine)
28 May 2026Big Sheep Mountain Montana, USdaily high max (Tie)30.6 C (87.1 F)tie27 years3 of 100 (Routine)
27 May 2026Big Sheep Mountain Montana, USdaily high min17.8 C (64.0 F)2.8 C (5.0 F)37 years21 of 100 (Routine)
26 May 2026Big Sheep Mountain Montana, USmonthly high min18.9 C (66.0 F)0.6 C (1.1 F)37 years26 of 100 (Routine)

Climate Trend

37 complete years, 1986 to 2024
Annual mean temperature at Big Sheep Mountain Montana as warming stripes, 1986 to 2024 One stripe for each of 37 complete years at Big Sheep Mountain Montana, 1986 to 2024. Blue stripes are years cooler than the station's own mean of 7.2 C (44.9 F); red stripes are warmer. The coolest year was 1996, at 4.8 C (40.6 F), and the warmest was 2012, at 8.7 C (47.7 F). The strongest colour marks a difference of 2.4 C (4.3 F). 1986: 6.8 C, -0.4 C from the station mean1987: 8.4 C, +1.2 C from the station mean1988: 7.8 C, +0.6 C from the station mean1989: 5.7 C, -1.4 C from the station mean1990: 7.4 C, +0.2 C from the station mean1992: 7.3 C, +0.1 C from the station mean1994: 7.0 C, -0.2 C from the station mean1995: 6.8 C, -0.4 C from the station mean1996: 4.8 C, -2.4 C from the station mean1997: 7.4 C, +0.3 C from the station mean1998: 8.0 C, +0.8 C from the station mean1999: 8.3 C, +1.1 C from the station mean2000: 6.9 C, -0.3 C from the station mean2001: 7.8 C, +0.6 C from the station mean2002: 6.4 C, -0.8 C from the station mean2003: 7.3 C, +0.2 C from the station mean2004: 6.9 C, -0.3 C from the station mean2005: 7.4 C, +0.2 C from the station mean2006: 8.3 C, +1.2 C from the station mean2007: 8.1 C, +0.9 C from the station mean2008: 6.3 C, -0.8 C from the station mean2009: 6.1 C, -1.1 C from the station mean2010: 6.4 C, -0.7 C from the station mean2011: 6.4 C, -0.7 C from the station mean2012: 8.7 C, +1.5 C from the station mean2013: 6.6 C, -0.6 C from the station mean2014: 6.2 C, -1.0 C from the station mean2015: 8.2 C, +1.0 C from the station mean2016: 8.3 C, +1.1 C from the station mean2017: 7.7 C, +0.5 C from the station mean2018: 6.0 C, -1.1 C from the station mean2019: 5.3 C, -1.8 C from the station mean2020: 7.6 C, +0.4 C from the station mean2021: 8.1 C, +0.9 C from the station mean2022: 6.5 C, -0.7 C from the station mean2023: 7.8 C, +0.7 C from the station mean2024: 8.3 C, +1.1 C from the station mean19861990199520002005201020152020
One stripe for each of 37 complete years at Big Sheep Mountain Montana, 1986 to 2024. Blue stripes are years cooler than the station's own mean of 7.2 C (44.9 F); red stripes are warmer. The coolest year was 1996, at 4.8 C (40.6 F), and the warmest was 2012, at 8.7 C (47.7 F). The strongest colour marks a difference of 2.4 C (4.3 F).
Annual mean temperature at Big Sheep Mountain Montana as warming stripes, 1986 to 2024
YearAnnual mean temperatureDifference from the station mean
19866.8 C-0.37 C
19878.4 C+1.23 C
19887.8 C+0.65 C
19895.7 C-1.44 C
19907.4 C+0.22 C
19927.3 C+0.13 C
19947.0 C-0.21 C
19956.8 C-0.36 C
19964.8 C-2.38 C
19977.4 C+0.26 C
19988.0 C+0.82 C
19998.3 C+1.14 C
20006.9 C-0.29 C
20017.8 C+0.59 C
20026.4 C-0.75 C
20037.3 C+0.16 C
20046.9 C-0.29 C
20057.4 C+0.22 C
20068.3 C+1.16 C
20078.1 C+0.92 C
20086.3 C-0.84 C
20096.1 C-1.09 C
20106.4 C-0.73 C
20116.4 C-0.74 C
20128.7 C+1.53 C
20136.6 C-0.56 C
20146.2 C-1.00 C
20158.2 C+1.04 C
20168.3 C+1.11 C
20177.7 C+0.48 C
20186.0 C-1.14 C
20195.3 C-1.83 C
20207.6 C+0.44 C
20218.1 C+0.95 C
20226.5 C-0.69 C
20237.8 C+0.66 C
20248.3 C+1.10 C

The fitted trend in annual mean temperature here over 1986 to 2024 is 0.05 C (-0.24 to 0.34) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.1 F (-0.4 to 0.6) per decade. The slope is a straight line fitted to 37 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Big Sheep Mountain Montana
MeasurePer decade (C)Per decade (F)PeriodComplete yearsReading
Annual mean temperature0.05 C (-0.24 to 0.34) per decade0.1 F (-0.4 to 0.6) per decade1986 to 202437Not clearly different from zero
Mean daily maximum0.1 C (-0.2 to 0.4) per decade0.1 F (-0.4 to 0.7) per decade1986 to 202437Not clearly different from zero
Mean daily minimum0.02 C (-0.25 to 0.28) per decade0.03 F (-0.45 to 0.51) per decade1986 to 202437Not clearly different from zero

A year is complete when all 12 months have at least 20 days of both daily maximum and daily minimum readings. The annual mean is the mean of the monthly means. The trend describes this one station over this period; it does not say what caused the change.

Extremes by Year

1985 to 2026
Yearly extremes at Big Sheep Mountain Montana: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)43.9 C (111.0 F)202638.3 C (100.9 F)42
Coldest night (TNn)-38.3 C (-36.9 F)1989-30.0 C (-22.0 F)42

Hottest day (TXx)

Hottest day (TXx) at Big Sheep Mountain Montana by year The hottest day of the year at Big Sheep Mountain Montana, 1985 to 2026. The record is 43.9 C (111.0 F) in 2026, marked on the chart; the median year is 38.3 C (100.9 F). 303540451990200020102020Record: 43.9 C (111.0 F) in 2026
The hottest day of the year at Big Sheep Mountain Montana, 1985 to 2026. The record is 43.9 C (111.0 F) in 2026, marked on the chart; the median year is 38.3 C (100.9 F).
Hottest day (TXx) at Big Sheep Mountain Montana by year
YearHottest day (TXx)
198537.8 C (100.0 F)
198633.9 C (93.0 F)
198742.2 C (108.0 F)
198840.6 C (105.1 F)
198938.3 C (100.9 F)
199037.2 C (99.0 F)
199136.1 C (97.0 F)
199235.6 C (96.1 F)
199332.2 C (90.0 F)
199436.1 C (97.0 F)
199540.0 C (104.0 F)
199636.1 C (97.0 F)
199736.7 C (98.1 F)
199837.2 C (99.0 F)
199938.3 C (100.9 F)
200037.8 C (100.0 F)
200139.4 C (102.9 F)
200241.1 C (106.0 F)
200339.4 C (102.9 F)
200438.9 C (102.0 F)
200538.3 C (100.9 F)
200638.9 C (102.0 F)
200741.7 C (107.1 F)
200838.3 C (100.9 F)
200936.1 C (97.0 F)
201037.2 C (99.0 F)
201136.1 C (97.0 F)
201239.4 C (102.9 F)
201335.6 C (96.1 F)
201435.0 C (95.0 F)
201538.9 C (102.0 F)
201635.6 C (96.1 F)
201738.9 C (102.0 F)
201838.9 C (102.0 F)
201935.6 C (96.1 F)
202036.7 C (98.1 F)
202140.4 C (104.7 F)
202238.9 C (102.0 F)
202338.3 C (100.9 F)
202440.0 C (104.0 F)
202537.8 C (100.0 F)
202643.9 C (111.0 F)

Coldest night (TNn)

Coldest night (TNn) at Big Sheep Mountain Montana by year The coldest night of the year at Big Sheep Mountain Montana, 1985 to 2026. The record is -38.3 C (-36.9 F) in 1989, marked on the chart; the median year is -30.0 C (-22.0 F). -40-35-30-25-201990200020102020Record: -38.3 C (-36.9 F) in 1989
The coldest night of the year at Big Sheep Mountain Montana, 1985 to 2026. The record is -38.3 C (-36.9 F) in 1989, marked on the chart; the median year is -30.0 C (-22.0 F).
Coldest night (TNn) at Big Sheep Mountain Montana by year
YearColdest night (TNn)
1985-33.0 C (-27.4 F)
1986-26.7 C (-16.1 F)
1987-24.4 C (-11.9 F)
1988-31.1 C (-24.0 F)
1989-38.3 C (-36.9 F)
1990-35.0 C (-31.0 F)
1991-26.1 C (-15.0 F)
1992-33.3 C (-27.9 F)
1993-27.2 C (-17.0 F)
1994-31.1 C (-24.0 F)
1995-27.8 C (-18.0 F)
1996-35.0 C (-31.0 F)
1997-31.1 C (-24.0 F)
1998-30.0 C (-22.0 F)
1999-24.4 C (-11.9 F)
2000-26.7 C (-16.1 F)
2001-22.8 C (-9.0 F)
2002-26.1 C (-15.0 F)
2003-28.3 C (-18.9 F)
2004-31.1 C (-24.0 F)
2005-30.0 C (-22.0 F)
2006-30.0 C (-22.0 F)
2007-25.6 C (-14.1 F)
2008-33.3 C (-27.9 F)
2009-31.7 C (-25.1 F)
2010-28.9 C (-20.0 F)
2011-31.7 C (-25.1 F)
2012-26.1 C (-15.0 F)
2013-32.2 C (-26.0 F)
2014-28.9 C (-20.0 F)
2015-27.2 C (-17.0 F)
2016-28.9 C (-20.0 F)
2017-30.0 C (-22.0 F)
2018-31.7 C (-25.1 F)
2019-32.2 C (-26.0 F)
2020-27.2 C (-17.0 F)
2021-33.9 C (-29.0 F)
2022-32.8 C (-27.0 F)
2023-30.0 C (-22.0 F)
2024-37.2 C (-35.0 F)
2025-29.4 C (-20.9 F)
2026-31.7 C (-25.1 F)

Each chart shows one value per year; the dot marks the record year. TXx is the hottest daily maximum, TNn the coldest daily minimum, Rx1day and Rx5day the largest one-day and five-day rain totals, and CDD the longest run of days with less than 1 mm of rain. A year with missing days can understate an extreme.

Frost Dates and Growing Season

37 years with a frost

Across 37 years with a frost, the median last spring frost at Big Sheep Mountain Montana falls on 11 May and the median first autumn frost on 30 September, which leaves a median of 139 days between them.

Fitted over all years, the growing season changes by +3.7 days per decade at this station.

Frost dates and growing season at Big Sheep Mountain Montana
MeasureMedian, all yearsEarliest periodRecent period (1995 to 2024)Recent against earliestFitted trend
Last spring frost11 Mayn/a12 Mayn/a-0.8 days per decade
First autumn frost30 Septembern/a1 Octobern/a+2.9 days per decade
Growing days139 daysn/a138 daysn/a+3.7 days per decade

A frost day is a day with a daily minimum at or below 0 C (32 F). The last spring frost and the first autumn frost are the last and first such days of the cold season, and growing days are the days between them. A negative trend for the last spring frost means it comes earlier.

Download the Data

  • Data for Big Sheep Mountain Montana standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Big Sheep Mountain 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 2026-10-13 (13 October 2026). Records are computed by this site and are not official.

Data as of . Last revised (2026-10-13).