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Built 2026-10-15 (15 October 2026)

Onion Park Weather Records (USS0010C22S)

Record envelope, standing records and threshold days for Onion Park (USS0010C22S), Montana, United States, with 34 years of record.

Key Facts for Onion Park

  • Onion Park (USS0010C22S) is a weather station in Montana, United States at 46.91 latitude and -110.85 longitude, 2,259 m (7,410 ft) above sea level.
  • The station reports from 1993 to 2026, 34 years of record.
  • 1,464 records set at Onion Park still stand.
  • Records are tracked for tmin: an element needs 30 years of data to be eligible.
  • Onion Park tied a monthly record high minimum temperature of 9.1 C (48.4 F) on 5 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, 46.91 latitude, -110.85 longitude.
  • Elevation: 2,259 m (7,410 ft).
  • Period of record: 1993 to 2026, 34 years.
  • Eligible elements: tmin.

Daily Record Envelope and 2026

16 days at or beyond a record
Daily record high and record low at Onion Park, with 2026 drawn through them The band shows the record high and record low for each calendar day at Onion Park. The lines show the 2026 daily maximum and minimum. 16 days in 2026 matched or passed a record. Temperatures are in degrees Celsius. -60-40-2002040 JanFebMarAprMayJunJulAugSepOctNovDec
The band shows the record high and record low for each calendar day at Onion Park. The lines show the 2026 daily maximum and minimum. 16 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Onion Park, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan11.8 C (53.2 F)-41.8 C (-43.2 F)6.3 C (43.3 F)-25.1 C (-13.2 F)
Feb10.3 C (50.5 F)-39.4 C (-38.9 F)9.9 C (49.8 F)-21.2 C (-6.2 F)
Mar16.9 C (62.4 F)-31.9 C (-25.4 F)14.5 C (58.1 F)-22.3 C (-8.1 F)
Apr22.4 C (72.3 F)-27.1 C (-16.8 F)18.3 C (64.9 F)-12.0 C (10.4 F)
May25.2 C (77.4 F)-14.9 C (5.2 F)22.0 C (71.6 F)-10.7 C (12.7 F)
Jun30.2 C (86.4 F)-6.1 C (21.0 F)20.6 C (69.1 F)-4.1 C (24.6 F)
Jul31.7 C (89.1 F)-3.4 C (25.9 F)31.7 C (89.1 F)4.3 C (39.7 F)
Aug32.0 C (89.6 F)-3.4 C (25.9 F)29.4 C (84.9 F)0.0 C (32.0 F)
Sep30.0 C (86.0 F)-13.8 C (7.2 F)20.7 C (69.3 F)-2.7 C (27.1 F)
Oct24.9 C (76.8 F)-25.2 C (-13.4 F)20.4 C (68.7 F)-6.4 C (20.5 F)
Nov16.0 C (60.8 F)-31.0 C (-23.8 F)n/an/a
Dec13.0 C (55.4 F)-38.6 C (-37.5 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Onion Park by the year they were set 1,464 records at Onion Park still stand. 2021 holds the most, with 65. 0204060801993: 111994: 191995: 401996: 501997: 331998: 221999: 232000: 142001: 72002: 562003: 622004: 362005: 612006: 392007: 472008: 512009: 592010: 402011: 372012: 522013: 392014: 602015: 522016: 602017: 632018: 302019: 422020: 562021: 652022: 532023: 362024: 622025: 412026: 46199319972001200520092013201720212025
1,464 records at Onion Park still stand. 2021 holds the most, with 65.
Standing records at Onion Park by the year they were set
Year setStanding records
199311
199419
199540
199650
199733
199822
199923
200014
20017
200256
200362
200436
200561
200639
200747
200851
200959
201040
201137
201252
201339
201460
201552
201660
201763
201830
201942
202056
202165
202253
202336
202462
202541
202646

Wettest Day of Each Month

Apr: 73.7 mm (2.9 in)
Record daily precipitation for each month at Onion Park The wettest day on record for each calendar month at Onion Park. The most was 73.7 mm (2.9 in) on 29 April 2010. 020406080 Jan: 27.9 mm (1.1 in), 11 January 2025 Jan Feb: 40.6 mm (1.6 in), 5 February 2011 Feb Mar: 27.9 mm (1.1 in), 13 March 2026 Mar Apr: 73.7 mm (2.9 in), 29 April 2010 Apr May: 63.5 mm (2.5 in), 7 May 2024 May Jun: 38.1 mm (1.5 in), 10 June 2002 Jun Jul: 30.5 mm (1.2 in), 27 July 2015 Jul Aug: 73.7 mm (2.9 in), 23 August 2014 Aug Sep: 68.6 mm (2.7 in), 18 September 2024 Sep Oct: 53.3 mm (2.1 in), 27 October 2009 Oct Nov: 40.6 mm (1.6 in), 5 November 2024 Nov Dec: 30.5 mm (1.2 in), 27 December 2003 Dec
The wettest day on record for each calendar month at Onion Park. The most was 73.7 mm (2.9 in) on 29 April 2010.
Record daily precipitation for each month at Onion Park
MonthRecord daily precipitation (mm)Date
Jan27.9 mm (1.1 in)11 January 2025
Feb40.6 mm (1.6 in)5 February 2011
Mar27.9 mm (1.1 in)13 March 2026
Apr73.7 mm (2.9 in)29 April 2010
May63.5 mm (2.5 in)7 May 2024
Jun38.1 mm (1.5 in)10 June 2002
Jul30.5 mm (1.2 in)27 July 2015
Aug73.7 mm (2.9 in)23 August 2014
Sep68.6 mm (2.7 in)18 September 2024
Oct53.3 mm (2.1 in)27 October 2009
Nov40.6 mm (1.6 in)5 November 2024
Dec30.5 mm (1.2 in)27 December 2003

Period of Record Coverage

1993 to 2026
Days with data per year at Onion Park 34 years of record at Onion Park, 1993 to 2026. 10 years have data for under 90 percent of days and are left out of rankings: 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000 and others. 1993: 56 of 365 days1994: 112 of 365 days1995: 99 of 365 days1996: 117 of 366 days1997: 111 of 365 days1998: 95 of 365 days1999: 98 of 365 days2000: 57 of 366 days2001: 113 of 365 days2002: 364 of 365 days2003: 365 of 365 days2004: 365 of 366 days2005: 365 of 365 days2006: 365 of 365 days2007: 365 of 365 days2008: 366 of 366 days2009: 365 of 365 days2010: 365 of 365 days2011: 365 of 365 days2012: 366 of 366 days2013: 365 of 365 days2014: 365 of 365 days2015: 365 of 365 days2016: 366 of 366 days2017: 365 of 365 days2018: 365 of 365 days2019: 365 of 365 days2020: 366 of 366 days2021: 363 of 365 days2022: 365 of 365 days2023: 365 of 365 days2024: 365 of 366 days2025: 365 of 365 days2026: 283 of 365 days1995200020052010201520202025
34 years of record at Onion Park, 1993 to 2026. 10 years have data for under 90 percent of days and are left out of rankings: 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000 and others.
Days with data per year at Onion Park
YearDays with dataShare of yearComplete
19935615%No
199411231%No
19959927%No
199611732%No
199711130%No
19989526%No
19999827%No
20005716%No
200111331%No
2002364100%Yes
2003365100%Yes
2004365100%Yes
2005365100%Yes
2006365100%Yes
2007365100%Yes
2008366100%Yes
2009365100%Yes
2010365100%Yes
2011365100%Yes
2012366100%Yes
2013365100%Yes
2014365100%Yes
2015365100%Yes
2016366100%Yes
2017365100%Yes
2018365100%Yes
2019365100%Yes
2020366100%Yes
202136399%Yes
2022365100%Yes
2023365100%Yes
2024365100%Yes
2025365100%Yes
202628378%No

Latest Records

20
Latest records at Onion Park
DateStationRecordValueBeat old record byOld record stoodSignificance
5 October 2026Onion Park, USmonthly high min (Tie, Provisional)9.1 C (48.4 F)tie10 years4 of 100 (Routine)
22 August 2026Onion Park, USdaily high min (Provisional)12.8 C (55.0 F)1.2 C (2.2 F)15 years10 of 100 (Routine)
21 August 2026Onion Park, USdaily high min (Tie, Provisional)10.8 C (51.4 F)tie4 years1 of 100 (Routine)
3 August 2026Onion Park, USdaily low min1.1 C (34.0 F)0.1 C (0.2 F)24 years10 of 100 (Routine)
1 August 2026Onion Park, USdaily high min15.1 C (59.2 F)1.9 C (3.4 F)4 years9 of 100 (Routine)
25 July 2026Onion Park, USdaily high min13.9 C (57.0 F)1.2 C (2.2 F)23 years12 of 100 (Routine)
15 July 2026Onion Park, USdaily high min11.7 C (53.1 F)0.6 C (1.1 F)21 years10 of 100 (Routine)
14 July 2026Onion Park, USdaily high min (Tie)11.5 C (52.7 F)tie13 years1 of 100 (Routine)
11 July 2026Onion Park, USdaily high min13.3 C (55.9 F)1.0 C (1.8 F)1 year6 of 100 (Routine)
28 May 2026Onion Park, USdaily high min5.8 C (42.4 F)1.3 C (2.3 F)12 years9 of 100 (Routine)
27 May 2026Onion Park, USdaily high min6.7 C (44.1 F)2.8 C (5.0 F)8 years12 of 100 (Routine)
26 May 2026Onion Park, USdaily high min6.8 C (44.2 F)1.8 C (3.2 F)23 years14 of 100 (Routine)
6 May 2026Onion Park, USdaily low min-10.7 C (12.7 F)1.3 C (2.3 F)16 years10 of 100 (Routine)
5 May 2026Onion Park, USdaily low min-10.1 C (13.8 F)0.4 C (0.7 F)27 years12 of 100 (Routine)
29 March 2026Onion Park, USdaily high min-0.6 C (30.9 F)1.6 C (2.9 F)16 years9 of 100 (Routine)
28 March 2026Onion Park, USdaily high min-0.3 C (31.5 F)2.1 C (3.8 F)0 years6 of 100 (Routine)
24 March 2026Onion Park, USdaily high min1.1 C (34.0 F)1.2 C (2.2 F)0 years5 of 100 (Routine)
20 March 2026Onion Park, USdaily high min2.9 C (37.2 F)3.0 C (5.4 F)11 years11 of 100 (Routine)
15 March 2026Onion Park, USdaily low min-20.8 C (-5.4 F)2.4 C (4.3 F)5 years8 of 100 (Routine)
4 March 2026Onion Park, USdaily high min-2.4 C (27.7 F)1.4 C (2.5 F)13 years9 of 100 (Routine)

Climate Trend

24 complete years, 2002 to 2025
Annual mean temperature at Onion Park as warming stripes, 2002 to 2025 One stripe for each of 24 complete years at Onion Park, 2002 to 2025. Blue stripes are years cooler than the station's own mean of 1.7 C (35.0 F); red stripes are warmer. The coolest year was 2002, at 0.3 C (32.5 F), and the warmest was 2015, at 2.9 C (37.3 F). The strongest colour marks a difference of 1.5 C (2.7 F). 2002: 0.3 C, -1.4 C from the station mean2003: 1.9 C, +0.2 C from the station mean2004: 1.6 C, -0.1 C from the station mean2005: 1.6 C, -0.1 C from the station mean2006: 1.9 C, +0.2 C from the station mean2007: 2.0 C, +0.3 C from the station mean2008: 0.6 C, -1.1 C from the station mean2009: 1.0 C, -0.7 C from the station mean2010: 1.7 C, 0.0 C from the station mean2011: 1.2 C, -0.5 C from the station mean2012: 2.6 C, +1.0 C from the station mean2013: 1.7 C, 0.0 C from the station mean2014: 1.3 C, -0.4 C from the station mean2015: 2.9 C, +1.3 C from the station mean2016: 2.5 C, +0.8 C from the station mean2017: 2.2 C, +0.5 C from the station mean2018: 1.3 C, -0.4 C from the station mean2019: 0.5 C, -1.2 C from the station mean2020: 1.7 C, 0.0 C from the station mean2021: 2.1 C, +0.4 C from the station mean2022: 1.1 C, -0.6 C from the station mean2023: 2.0 C, +0.3 C from the station mean2024: 2.6 C, +0.9 C from the station mean2025: 2.4 C, +0.7 C from the station mean200220042006200820102012201420162018202020222024
One stripe for each of 24 complete years at Onion Park, 2002 to 2025. Blue stripes are years cooler than the station's own mean of 1.7 C (35.0 F); red stripes are warmer. The coolest year was 2002, at 0.3 C (32.5 F), and the warmest was 2015, at 2.9 C (37.3 F). The strongest colour marks a difference of 1.5 C (2.7 F).
Annual mean temperature at Onion Park as warming stripes, 2002 to 2025
YearAnnual mean temperatureDifference from the station mean
20020.3 C-1.43 C
20031.9 C+0.18 C
20041.6 C-0.12 C
20051.6 C-0.09 C
20061.9 C+0.24 C
20072.0 C+0.27 C
20080.6 C-1.13 C
20091.0 C-0.73 C
20101.7 C-0.03 C
20111.2 C-0.50 C
20122.6 C+0.96 C
20131.7 C-0.02 C
20141.3 C-0.39 C
20152.9 C+1.26 C
20162.5 C+0.83 C
20172.2 C+0.52 C
20181.3 C-0.35 C
20190.5 C-1.18 C
20201.7 C-0.02 C
20212.1 C+0.39 C
20221.1 C-0.56 C
20232.0 C+0.27 C
20242.6 C+0.95 C
20252.4 C+0.72 C

This station does not have enough complete years (30 are needed) to fit a temperature trend.

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

1993 to 2026
Yearly extremes at Onion Park: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)32.0 C (89.6 F)201828.8 C (83.8 F)34
Coldest night (TNn)-41.8 C (-43.2 F)2024-31.8 C (-25.2 F)34
Wettest day (Rx1day)73.7 mm (2.9 in)201031.8 mm (1.3 in)26
Wettest five days (Rx5day)137.2 mm (5.4 in)201069.9 mm (2.8 in)26
Longest dry spell (CDD)40 days201718 days26

Hottest day (TXx)

Hottest day (TXx) at Onion Park by year The hottest day of the year at Onion Park, 1993 to 2026. The record is 32.0 C (89.6 F) in 2018, marked on the chart; the median year is 28.8 C (83.8 F). 010203040200020102020Record: 32.0 C (89.6 F) in 2018
The hottest day of the year at Onion Park, 1993 to 2026. The record is 32.0 C (89.6 F) in 2018, marked on the chart; the median year is 28.8 C (83.8 F).
Hottest day (TXx) at Onion Park by year
YearHottest day (TXx)
19934.0 C (39.2 F)
199413.0 C (55.4 F)
19959.0 C (48.2 F)
19967.0 C (44.6 F)
199711.0 C (51.8 F)
19988.0 C (46.4 F)
19999.0 C (48.2 F)
20008.0 C (46.4 F)
200125.0 C (77.0 F)
200231.4 C (88.5 F)
200329.9 C (85.8 F)
200426.9 C (80.4 F)
200529.3 C (84.7 F)
200629.8 C (85.6 F)
200731.0 C (87.8 F)
200828.1 C (82.6 F)
200927.3 C (81.1 F)
201027.5 C (81.5 F)
201128.9 C (84.0 F)
201229.2 C (84.6 F)
201329.1 C (84.4 F)
201428.2 C (82.8 F)
201529.9 C (85.8 F)
201628.8 C (83.8 F)
201729.0 C (84.2 F)
201832.0 C (89.6 F)
201927.7 C (81.9 F)
202028.7 C (83.7 F)
202130.2 C (86.4 F)
202230.0 C (86.0 F)
202328.9 C (84.0 F)
202429.6 C (85.3 F)
202526.7 C (80.1 F)
202631.7 C (89.1 F)

Coldest night (TNn)

Coldest night (TNn) at Onion Park by year The coldest night of the year at Onion Park, 1993 to 2026. The record is -41.8 C (-43.2 F) in 2024, marked on the chart; the median year is -31.8 C (-25.2 F). -50-40-30-20-10200020102020Record: -41.8 C (-43.2 F) in 2024
The coldest night of the year at Onion Park, 1993 to 2026. The record is -41.8 C (-43.2 F) in 2024, marked on the chart; the median year is -31.8 C (-25.2 F).
Coldest night (TNn) at Onion Park by year
YearColdest night (TNn)
1993-31.0 C (-23.8 F)
1994-33.0 C (-27.4 F)
1995-35.0 C (-31.0 F)
1996-34.6 C (-30.3 F)
1997-27.0 C (-16.6 F)
1998-36.6 C (-33.9 F)
1999-27.7 C (-17.9 F)
2000-18.3 C (-0.9 F)
2001-19.1 C (-2.4 F)
2002-27.5 C (-17.5 F)
2003-31.7 C (-25.1 F)
2004-34.4 C (-29.9 F)
2005-28.1 C (-18.6 F)
2006-39.4 C (-38.9 F)
2007-31.4 C (-24.5 F)
2008-37.1 C (-34.8 F)
2009-31.9 C (-25.4 F)
2010-30.3 C (-22.5 F)
2011-30.4 C (-22.7 F)
2012-22.7 C (-8.9 F)
2013-35.2 C (-31.4 F)
2014-35.1 C (-31.2 F)
2015-27.5 C (-17.5 F)
2016-32.2 C (-26.0 F)
2017-27.4 C (-17.3 F)
2018-29.6 C (-21.3 F)
2019-31.9 C (-25.4 F)
2020-24.4 C (-11.9 F)
2021-35.8 C (-32.4 F)
2022-38.6 C (-37.5 F)
2023-34.0 C (-29.2 F)
2024-41.8 C (-43.2 F)
2025-31.9 C (-25.4 F)
2026-25.1 C (-13.2 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at Onion Park by year The wettest day of the year at Onion Park, 1993 to 2026. The record is 73.7 mm (2.9 in) in 2010, marked on the chart; the median year is 31.8 mm (1.3 in). 020406080200020102020Record: 73.7 mm (2.9 in) in 2010
The wettest day of the year at Onion Park, 1993 to 2026. The record is 73.7 mm (2.9 in) in 2010, marked on the chart; the median year is 31.8 mm (1.3 in).
Wettest day (Rx1day) at Onion Park by year
YearWettest day (Rx1day)
1993n/a
1994n/a
1995n/a
1996n/a
1997n/a
1998n/a
1999n/a
2000n/a
200115.2 mm (0.6 in)
200238.1 mm (1.5 in)
200330.5 mm (1.2 in)
200433.0 mm (1.3 in)
200530.5 mm (1.2 in)
200627.9 mm (1.1 in)
200738.1 mm (1.5 in)
200833.0 mm (1.3 in)
200953.3 mm (2.1 in)
201073.7 mm (2.9 in)
201158.4 mm (2.3 in)
201230.5 mm (1.2 in)
201345.7 mm (1.8 in)
201473.7 mm (2.9 in)
201530.5 mm (1.2 in)
201630.5 mm (1.2 in)
201730.5 mm (1.2 in)
201825.4 mm (1.0 in)
201922.9 mm (0.9 in)
202027.9 mm (1.1 in)
202125.4 mm (1.0 in)
202245.7 mm (1.8 in)
202333.0 mm (1.3 in)
202468.6 mm (2.7 in)
202527.9 mm (1.1 in)
202638.1 mm (1.5 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Onion Park by year The wettest five days of the year at Onion Park, 1993 to 2026. The record is 137.2 mm (5.4 in) in 2010, marked on the chart; the median year is 69.9 mm (2.8 in). 050100150200020102020Record: 137.2 mm (5.4 in) in 2010
The wettest five days of the year at Onion Park, 1993 to 2026. The record is 137.2 mm (5.4 in) in 2010, marked on the chart; the median year is 69.9 mm (2.8 in).
Wettest five days (Rx5day) at Onion Park by year
YearWettest five days (Rx5day)
1993n/a
1994n/a
1995n/a
1996n/a
1997n/a
1998n/a
1999n/a
2000n/a
200122.9 mm (0.9 in)
200258.4 mm (2.3 in)
200353.3 mm (2.1 in)
200486.3 mm (3.4 in)
200588.9 mm (3.5 in)
200658.4 mm (2.3 in)
200786.3 mm (3.4 in)
200891.4 mm (3.6 in)
200986.3 mm (3.4 in)
2010137.2 mm (5.4 in)
201188.9 mm (3.5 in)
201268.6 mm (2.7 in)
201376.2 mm (3.0 in)
2014111.8 mm (4.4 in)
201543.2 mm (1.7 in)
201658.4 mm (2.3 in)
201753.3 mm (2.1 in)
201855.8 mm (2.2 in)
201955.8 mm (2.2 in)
202071.1 mm (2.8 in)
202163.4 mm (2.5 in)
202250.8 mm (2.0 in)
202376.2 mm (3.0 in)
2024109.2 mm (4.3 in)
202578.7 mm (3.1 in)
202668.5 mm (2.7 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Onion Park by year The longest dry spell of the year at Onion Park, 1993 to 2026. The record is 40 days in 2017, marked on the chart; the median year is 18 days. 010203040200020102020Record: 40 days in 2017
The longest dry spell of the year at Onion Park, 1993 to 2026. The record is 40 days in 2017, marked on the chart; the median year is 18 days.
Longest dry spell (CDD) at Onion Park by year
YearLongest dry spell (CDD)
1993n/a
1994n/a
1995n/a
1996n/a
1997n/a
1998n/a
1999n/a
2000n/a
20019 days
200210 days
200324 days
200414 days
200517 days
200618 days
200716 days
200817 days
200923 days
201019 days
201125 days
201228 days
201315 days
201417 days
201529 days
201620 days
201740 days
201812 days
201923 days
202014 days
202117 days
202220 days
202328 days
202428 days
20258 days
202617 days

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

24 years with a frost

Across 24 years with a frost, the median last spring frost at Onion Park falls on 20 June and the median first autumn frost on 26 August, which leaves a median of 70 days between them.

Frost dates and growing season at Onion Park
MeasureMedian, all yearsEarliest periodRecent period (2002 to 2025)Recent against earliestFitted trend
Last spring frost20 Junen/a20 Junen/an/a
First autumn frost26 Augustn/a26 Augustn/an/a
Growing days70 daysn/a70 daysn/an/a

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 Onion Park standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Onion Park 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).