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Mt. Wilson Oregon Weather Records (USR0000OMTW)

Record envelope, standing records and threshold days for Mt. Wilson Oregon (USR0000OMTW), Oregon, United States, with 33 years of record.

Key Facts for Mt. Wilson Oregon

  • Mt. Wilson Oregon (USR0000OMTW) is a weather station in Oregon, United States at 45.03 latitude and -121.63 longitude, 1,152 m (3,780 ft) above sea level.
  • The station reports from 1991 to 2023, 33 years of record.
  • 1,464 records set at Mt. Wilson Oregon still stand.
  • Records are tracked for tmax, tmin: an element needs 30 years of data to be eligible.
  • Mt. Wilson Oregon set a daily record high maximum temperature of 27.8 C (82.0 F) on 8 October 2026 (provisional).

Provisional Records

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

About the Station

  • Location: Oregon, United States, 45.03 latitude, -121.63 longitude.
  • Elevation: 1,152 m (3,780 ft).
  • Period of record: 1991 to 2023, 33 years.
  • Eligible elements: tmax, tmin.

Daily Record Envelope and 2026

17 days at or beyond a record
Daily record high and record low at Mt. Wilson Oregon, with 2026 drawn through them The band shows the record high and record low for each calendar day at Mt. Wilson Oregon. The lines show the 2026 daily maximum and minimum. 17 days in 2026 matched or passed a record. Temperatures are in degrees Celsius. -40-2002040 JanFebMarAprMayJunJulAugSepOctNovDec
The band shows the record high and record low for each calendar day at Mt. Wilson Oregon. The lines show the 2026 daily maximum and minimum. 17 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Mt. Wilson Oregon, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan33.3 C (91.9 F)-22.2 C (-8.0 F)21.1 C (70.0 F)-11.1 C (12.0 F)
Feb21.1 C (70.0 F)-21.1 C (-6.0 F)17.8 C (64.0 F)-6.1 C (21.0 F)
Mar23.9 C (75.0 F)-15.0 C (5.0 F)21.7 C (71.1 F)-5.0 C (23.0 F)
Apr29.4 C (84.9 F)-9.4 C (15.1 F)22.2 C (72.0 F)-4.4 C (24.1 F)
May32.8 C (91.0 F)-5.6 C (21.9 F)25.6 C (78.1 F)-1.1 C (30.0 F)
Jun39.4 C (102.9 F)-1.1 C (30.0 F)31.1 C (88.0 F)1.1 C (34.0 F)
Jul37.8 C (100.0 F)0.6 C (33.1 F)32.8 C (91.0 F)3.9 C (39.0 F)
Aug38.9 C (102.0 F)-0.6 C (30.9 F)33.9 C (93.0 F)2.8 C (37.0 F)
Sep37.8 C (100.0 F)-2.2 C (28.0 F)28.9 C (84.0 F)0.6 C (33.1 F)
Oct29.4 C (84.9 F)-12.8 C (9.0 F)29.4 C (84.9 F)-1.1 C (30.0 F)
Nov23.3 C (73.9 F)-18.3 C (-0.9 F)n/an/a
Dec20.0 C (68.0 F)-21.1 C (-6.0 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Mt. Wilson Oregon by the year they were set 1,464 records at Mt. Wilson Oregon still stand. 1996 holds the most, with 77. 0204060801992: 661993: 681994: 511995: 461996: 771997: 301998: 351999: 522000: 432001: 382002: 502003: 362004: 242005: 342006: 532007: 412008: 682009: 542010: 322011: 382012: 412013: 302014: 502015: 352016: 372017: 342018: 232019: 472020: 262021: 312022: 522023: 322024: 332025: 332026: 24199219962000200420082012201620202024
1,464 records at Mt. Wilson Oregon still stand. 1996 holds the most, with 77.
Standing records at Mt. Wilson Oregon by the year they were set
Year setStanding records
199266
199368
199451
199546
199677
199730
199835
199952
200043
200138
200250
200336
200424
200534
200653
200741
200868
200954
201032
201138
201241
201330
201450
201535
201637
201734
201823
201947
202026
202131
202252
202332
202433
202533
202624

All-Time Record Progression

3 new records
When Mt. Wilson Oregon set new all-time records 3 all-time records were set at Mt. Wilson Oregon between 22 December 2022 and 13 January 2024. Each dot is a new record. Record low maximum temperatureRecord low minimum temperature22 December 2022: Record low maximum temperature -16.1 C (3.0 F)13 January 2024: Record low maximum temperature -19.4 C (-2.9 F)13 January 2024: Record low minimum temperature -22.2 C (-8.0 F)2025
3 all-time records were set at Mt. Wilson Oregon between 22 December 2022 and 13 January 2024. Each dot is a new record.
When Mt. Wilson Oregon set new all-time records
DateKindDetail
2022-12-22Record low maximum temperatureRecord low maximum temperature -16.1 C (3.0 F)
2024-01-13Record low maximum temperatureRecord low maximum temperature -19.4 C (-2.9 F)
2024-01-13Record low minimum temperatureRecord low minimum temperature -22.2 C (-8.0 F)

Period of Record Coverage

1991 to 2026
Days with data per year at Mt. Wilson Oregon 36 years of record at Mt. Wilson Oregon, 1991 to 2026. 2 years have data for under 90 percent of days and are left out of rankings: 1991, 2026. 1991: 37 of 365 days1992: 364 of 366 days1993: 349 of 365 days1994: 361 of 365 days1995: 360 of 365 days1996: 365 of 366 days1997: 354 of 365 days1998: 363 of 365 days1999: 342 of 365 days2000: 366 of 366 days2001: 365 of 365 days2002: 360 of 365 days2003: 365 of 365 days2004: 365 of 366 days2005: 365 of 365 days2006: 329 of 365 days2007: 333 of 365 days2008: 365 of 366 days2009: 363 of 365 days2010: 361 of 365 days2011: 363 of 365 days2012: 365 of 366 days2013: 365 of 365 days2014: 365 of 365 days2015: 364 of 365 days2016: 366 of 366 days2017: 364 of 365 days2018: 365 of 365 days2019: 365 of 365 days2020: 365 of 366 days2021: 365 of 365 days2022: 364 of 365 days2023: 361 of 365 days2024: 363 of 366 days2025: 365 of 365 days2026: 284 of 365 days1995200020052010201520202025
36 years of record at Mt. Wilson Oregon, 1991 to 2026. 2 years have data for under 90 percent of days and are left out of rankings: 1991, 2026.
Days with data per year at Mt. Wilson Oregon
YearDays with dataShare of yearComplete
19913710%No
199236499%Yes
199334996%Yes
199436199%Yes
199536099%Yes
1996365100%Yes
199735497%Yes
199836399%Yes
199934294%Yes
2000366100%Yes
2001365100%Yes
200236099%Yes
2003365100%Yes
2004365100%Yes
2005365100%Yes
200632990%Yes
200733391%Yes
2008365100%Yes
200936399%Yes
201036199%Yes
201136399%Yes
2012365100%Yes
2013365100%Yes
2014365100%Yes
2015364100%Yes
2016366100%Yes
2017364100%Yes
2018365100%Yes
2019365100%Yes
2020365100%Yes
2021365100%Yes
2022364100%Yes
202336199%Yes
202436399%Yes
2025365100%Yes
202628478%No

Latest Records

20
Latest records at Mt. Wilson Oregon
DateStationRecordValueBeat old record byOld record stoodSignificance
8 October 2026Mt. Wilson Oregon, USdaily high max (Provisional)27.8 C (82.0 F)1.7 C (3.1 F)29 years13 of 100 (Routine)
7 October 2026Mt. Wilson Oregon, USdaily high max (Tie, Provisional)26.1 C (79.0 F)tie1 year0 of 100 (Routine)
5 October 2026Mt. Wilson Oregon, USdaily high min (Tie, Provisional)10.6 C (51.1 F)tie4 years1 of 100 (Routine)
4 October 2026Mt. Wilson Oregon, USmonthly high max (Tie, Provisional)29.4 C (84.9 F)tie14 years4 of 100 (Routine)
25 September 2026Mt. Wilson Oregon, USdaily low max (Provisional)8.3 C (46.9 F)0.6 C (1.1 F)27 years11 of 100 (Routine)
13 September 2026Mt. Wilson Oregon, USdaily low max (Provisional)10.0 C (50.0 F)1.1 C (2.0 F)21 years10 of 100 (Routine)
6 September 2026Mt. Wilson Oregon, USdaily low max (Provisional)11.7 C (53.1 F)0.5 C (0.9 F)16 years8 of 100 (Routine)
4 September 2026Mt. Wilson Oregon, USdaily low max (Provisional)10.6 C (51.1 F)1.6 C (2.9 F)33 years15 of 100 (Routine)
29 August 2026Mt. Wilson Oregon, USdaily low max (Provisional)13.9 C (57.0 F)0.5 C (0.9 F)20 years9 of 100 (Routine)
21 August 2026Mt. Wilson Oregon, USdaily high min (Provisional)15.6 C (60.1 F)2.3 C (4.1 F)4 years10 of 100 (Routine)
20 August 2026Mt. Wilson Oregon, USdaily high min (Provisional)15.0 C (59.0 F)1.7 C (3.1 F)16 years12 of 100 (Routine)
6 August 2026Mt. Wilson Oregon, USdaily high min14.4 C (57.9 F)0.5 C (0.9 F)28 years12 of 100 (Routine)
6 August 2026Mt. Wilson Oregon, USdaily high max (Tie)33.9 C (93.0 F)tie7 years1 of 100 (Routine)
29 June 2026Mt. Wilson Oregon, USdaily low max11.7 C (53.1 F)3.3 C (5.9 F)19 years13 of 100 (Routine)
27 June 2026Mt. Wilson Oregon, USdaily low max10.6 C (51.1 F)0.5 C (0.9 F)27 years11 of 100 (Routine)
19 June 2026Mt. Wilson Oregon, USdaily high min12.2 C (54.0 F)1.1 C (2.0 F)33 years16 of 100 (Routine)
15 June 2026Mt. Wilson Oregon, USdaily high max31.1 C (88.0 F)3.9 C (7.0 F)24 years16 of 100 (Routine)
31 May 2026Mt. Wilson Oregon, USdaily low min (Tie)0.6 C (33.1 F)tie25 years2 of 100 (Routine)
4 May 2026Mt. Wilson Oregon, USdaily high min (Tie)10.6 C (51.1 F)tie33 years3 of 100 (Routine)
3 May 2026Mt. Wilson Oregon, USdaily high min9.4 C (48.9 F)1.1 C (2.0 F)33 years16 of 100 (Routine)

Climate Trend

31 complete years, 1992 to 2025
Annual mean temperature at Mt. Wilson Oregon as warming stripes, 1992 to 2025 One stripe for each of 31 complete years at Mt. Wilson Oregon, 1992 to 2025. Blue stripes are years cooler than the station's own mean of 7.6 C (45.8 F); red stripes are warmer. The coolest year was 1993, at 6.2 C (43.1 F), and the warmest was 2015, at 9.0 C (48.2 F). The strongest colour marks a difference of 1.5 C (2.7 F). 1992: 8.7 C, +1.0 C from the station mean1993: 6.2 C, -1.5 C from the station mean1994: 7.9 C, +0.2 C from the station mean1995: 7.4 C, -0.2 C from the station mean1996: 7.3 C, -0.4 C from the station mean1997: 7.4 C, -0.2 C from the station mean1998: 7.9 C, +0.2 C from the station mean2000: 6.9 C, -0.7 C from the station mean2001: 7.5 C, -0.2 C from the station mean2002: 7.4 C, -0.3 C from the station mean2003: 7.9 C, +0.3 C from the station mean2004: 8.2 C, +0.6 C from the station mean2005: 7.5 C, -0.2 C from the station mean2008: 7.1 C, -0.6 C from the station mean2009: 7.2 C, -0.4 C from the station mean2010: 6.7 C, -0.9 C from the station mean2011: 6.6 C, -1.0 C from the station mean2012: 7.3 C, -0.4 C from the station mean2013: 7.6 C, 0.0 C from the station mean2014: 7.8 C, +0.2 C from the station mean2015: 9.0 C, +1.4 C from the station mean2016: 7.9 C, +0.3 C from the station mean2017: 7.5 C, -0.2 C from the station mean2018: 7.9 C, +0.2 C from the station mean2019: 7.1 C, -0.6 C from the station mean2020: 8.2 C, +0.5 C from the station mean2021: 8.3 C, +0.6 C from the station mean2022: 8.2 C, +0.5 C from the station mean2023: 7.9 C, +0.3 C from the station mean2024: 8.0 C, +0.3 C from the station mean2025: 8.9 C, +1.3 C from the station mean19921995200020052010201520202025
One stripe for each of 31 complete years at Mt. Wilson Oregon, 1992 to 2025. Blue stripes are years cooler than the station's own mean of 7.6 C (45.8 F); red stripes are warmer. The coolest year was 1993, at 6.2 C (43.1 F), and the warmest was 2015, at 9.0 C (48.2 F). The strongest colour marks a difference of 1.5 C (2.7 F).
Annual mean temperature at Mt. Wilson Oregon as warming stripes, 1992 to 2025
YearAnnual mean temperatureDifference from the station mean
19928.7 C+1.01 C
19936.2 C-1.46 C
19947.9 C+0.20 C
19957.4 C-0.22 C
19967.3 C-0.37 C
19977.4 C-0.23 C
19987.9 C+0.22 C
20006.9 C-0.72 C
20017.5 C-0.18 C
20027.4 C-0.30 C
20037.9 C+0.28 C
20048.2 C+0.55 C
20057.5 C-0.19 C
20087.1 C-0.58 C
20097.2 C-0.41 C
20106.7 C-0.92 C
20116.6 C-1.04 C
20127.3 C-0.40 C
20137.6 C-0.03 C
20147.8 C+0.16 C
20159.0 C+1.35 C
20167.9 C+0.29 C
20177.5 C-0.20 C
20187.9 C+0.23 C
20197.1 C-0.59 C
20208.2 C+0.52 C
20218.3 C+0.64 C
20228.2 C+0.54 C
20237.9 C+0.26 C
20248.0 C+0.30 C
20258.9 C+1.26 C

The fitted trend in annual mean temperature here over 1992 to 2025 is 0.22 C (-0.01 to 0.44) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.39 F (-0.01 to 0.79) per decade. The slope is a straight line fitted to 31 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Mt. Wilson Oregon
MeasurePer decade (C)Per decade (F)PeriodComplete yearsReading
Annual mean temperature0.22 C (-0.01 to 0.44) per decade0.39 F (-0.01 to 0.79) per decade1992 to 202531Not clearly different from zero
Mean daily maximum0.4 C (0.1 to 0.6) per decade0.7 F (0.2 to 1.2) per decade1992 to 202531Rise
Mean daily minimum0.05 C (-0.23 to 0.32) per decade0.1 F (-0.4 to 0.6) per decade1992 to 202531Not 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

1991 to 2026
Yearly extremes at Mt. Wilson Oregon: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)39.4 C (102.9 F)202135.0 C (95.0 F)36
Coldest night (TNn)-22.2 C (-8.0 F)2024-15.6 C (3.9 F)36

Hottest day (TXx)

Hottest day (TXx) at Mt. Wilson Oregon by year The hottest day of the year at Mt. Wilson Oregon, 1991 to 2026. The record is 39.4 C (102.9 F) in 2021, marked on the chart; the median year is 35.0 C (95.0 F). 010203040200020102020Record: 39.4 C (102.9 F) in 2021
The hottest day of the year at Mt. Wilson Oregon, 1991 to 2026. The record is 39.4 C (102.9 F) in 2021, marked on the chart; the median year is 35.0 C (95.0 F).
Hottest day (TXx) at Mt. Wilson Oregon by year
YearHottest day (TXx)
19918.9 C (48.0 F)
199235.0 C (95.0 F)
199331.1 C (88.0 F)
199436.1 C (97.0 F)
199531.1 C (88.0 F)
199635.0 C (95.0 F)
199732.8 C (91.0 F)
199836.7 C (98.1 F)
199931.1 C (88.0 F)
200033.3 C (91.9 F)
200134.4 C (93.9 F)
200236.7 C (98.1 F)
200336.1 C (97.0 F)
200436.1 C (97.0 F)
200534.4 C (93.9 F)
200637.8 C (100.0 F)
200735.6 C (96.1 F)
200838.9 C (102.0 F)
200936.7 C (98.1 F)
201034.4 C (93.9 F)
201133.9 C (93.0 F)
201235.0 C (95.0 F)
201333.9 C (93.0 F)
201434.4 C (93.9 F)
201536.7 C (98.1 F)
201634.4 C (93.9 F)
201737.8 C (100.0 F)
201837.2 C (99.0 F)
201934.4 C (93.9 F)
202035.0 C (95.0 F)
202139.4 C (102.9 F)
202237.8 C (100.0 F)
202336.1 C (97.0 F)
202436.1 C (97.0 F)
202536.1 C (97.0 F)
202633.9 C (93.0 F)

Coldest night (TNn)

Coldest night (TNn) at Mt. Wilson Oregon by year The coldest night of the year at Mt. Wilson Oregon, 1991 to 2026. The record is -22.2 C (-8.0 F) in 2024, marked on the chart; the median year is -15.6 C (3.9 F). -25-20-15-10-5200020102020Record: -22.2 C (-8.0 F) in 2024
The coldest night of the year at Mt. Wilson Oregon, 1991 to 2026. The record is -22.2 C (-8.0 F) in 2024, marked on the chart; the median year is -15.6 C (3.9 F).
Coldest night (TNn) at Mt. Wilson Oregon by year
YearColdest night (TNn)
1991-7.8 C (18.0 F)
1992-17.2 C (1.0 F)
1993-18.3 C (-0.9 F)
1994-15.6 C (3.9 F)
1995-14.4 C (6.1 F)
1996-21.1 C (-6.0 F)
1997-13.9 C (7.0 F)
1998-20.6 C (-5.1 F)
1999-10.6 C (12.9 F)
2000-13.3 C (8.1 F)
2001-11.1 C (12.0 F)
2002-15.0 C (5.0 F)
2003-11.7 C (10.9 F)
2004-20.0 C (-4.0 F)
2005-16.1 C (3.0 F)
2006-17.2 C (1.0 F)
2007-11.7 C (10.9 F)
2008-18.3 C (-0.9 F)
2009-20.0 C (-4.0 F)
2010-16.1 C (3.0 F)
2011-18.9 C (-2.0 F)
2012-12.2 C (10.0 F)
2013-21.1 C (-6.0 F)
2014-18.3 C (-0.9 F)
2015-13.9 C (7.0 F)
2016-15.0 C (5.0 F)
2017-19.4 C (-2.9 F)
2018-15.0 C (5.0 F)
2019-15.0 C (5.0 F)
2020-11.7 C (10.9 F)
2021-15.6 C (3.9 F)
2022-18.9 C (-2.0 F)
2023-15.6 C (3.9 F)
2024-22.2 C (-8.0 F)
2025-16.1 C (3.0 F)
2026-11.1 C (12.0 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

31 years with a frost

Across 31 years with a frost, the median last spring frost at Mt. Wilson Oregon falls on 25 May and the median first autumn frost on 2 October, which leaves a median of 137 days between them.

Fitted over all years, the growing season changes by +0.6 days per decade at this station.

Frost dates and growing season at Mt. Wilson Oregon
MeasureMedian, all yearsEarliest periodRecent period (1993 to 2025)Recent against earliestFitted trend
Last spring frost25 Mayn/a25 Mayn/a+0.7 days per decade
First autumn frost2 Octobern/a2 Octobern/a+1.4 days per decade
Growing days137 daysn/a136 daysn/a+0.6 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 Mt. Wilson Oregon standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Mt. Wilson Oregon 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 2026-10-16 (16 October 2026). Records are computed by this site and are not official.

Data as of . Last revised (2026-10-16).