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Built 2026-10-15 (15 October 2026)

Grassy Mountain Oregon Weather Records (USR0000OGRM)

Record envelope, standing records and threshold days for Grassy Mountain Oregon (USR0000OGRM), Oregon, United States, with 39 years of record.

Key Facts for Grassy Mountain Oregon

  • Grassy Mountain Oregon (USR0000OGRM) is a weather station in Oregon, United States at 42.63 latitude and -117.39 longitude, 1,390 m (4,560 ft) above sea level.
  • The station reports from 1985 to 2023, 39 years of record.
  • 1,464 records set at Grassy Mountain Oregon still stand.
  • Records are tracked for tmax, tmin: an element needs 30 years of data to be eligible.
  • Grassy Mountain Oregon set a daily record high minimum temperature of 15.6 C (60.1 F) on 7 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, 42.63 latitude, -117.39 longitude.
  • Elevation: 1,390 m (4,560 ft).
  • Period of record: 1985 to 2023, 39 years.
  • Eligible elements: tmax, tmin.

Daily Record Envelope and 2026

24 days at or beyond a record
Daily record high and record low at Grassy Mountain Oregon, with 2026 drawn through them The band shows the record high and record low for each calendar day at Grassy Mountain Oregon. The lines show the 2026 daily maximum and minimum. 24 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 Grassy Mountain Oregon. The lines show the 2026 daily maximum and minimum. 24 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Grassy Mountain Oregon, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan16.1 C (61.0 F)-21.7 C (-7.1 F)14.4 C (57.9 F)-11.1 C (12.0 F)
Feb20.0 C (68.0 F)-22.9 C (-9.2 F)16.1 C (61.0 F)-8.9 C (16.0 F)
Mar28.3 C (82.9 F)-13.3 C (8.1 F)28.3 C (82.9 F)-4.4 C (24.1 F)
Apr30.6 C (87.1 F)-7.8 C (18.0 F)23.9 C (75.0 F)-6.1 C (21.0 F)
May35.0 C (95.0 F)-6.1 C (21.0 F)33.3 C (91.9 F)-1.7 C (28.9 F)
Jun39.4 C (102.9 F)-1.1 C (30.0 F)34.4 C (93.9 F)3.3 C (37.9 F)
Jul42.8 C (109.0 F)1.0 C (33.8 F)37.8 C (100.0 F)9.4 C (48.9 F)
Aug40.0 C (104.0 F)0.0 C (32.0 F)37.8 C (100.0 F)7.2 C (45.0 F)
Sep38.9 C (102.0 F)-2.8 C (27.0 F)30.6 C (87.1 F)3.9 C (39.0 F)
Oct34.4 C (93.9 F)-14.4 C (6.1 F)31.7 C (89.1 F)2.2 C (36.0 F)
Nov23.9 C (75.0 F)-17.2 C (1.0 F)n/an/a
Dec18.3 C (64.9 F)-29.4 C (-20.9 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Grassy Mountain Oregon by the year they were set 1,464 records at Grassy Mountain Oregon still stand. 1985 holds the most, with 60. 02040601985: 601986: 401987: 471988: 431989: 311990: 601991: 261992: 531993: 531994: 451995: 491996: 571997: 171998: 251999: 392000: 312001: 242002: 392003: 532004: 162005: 182006: 292007: 272008: 392009: 422010: 322011: 232012: 312013: 312014: 222015: 392016: 312017: 362018: 192019: 192020: 222021: 392022: 392023: 282024: 282025: 372026: 25198519901995200020052010201520202025
1,464 records at Grassy Mountain Oregon still stand. 1985 holds the most, with 60.
Standing records at Grassy Mountain Oregon by the year they were set
Year setStanding records
198560
198640
198747
198843
198931
199060
199126
199253
199353
199445
199549
199657
199717
199825
199939
200031
200124
200239
200353
200416
200518
200629
200727
200839
200942
201032
201123
201231
201331
201422
201539
201631
201736
201819
201919
202022
202139
202239
202328
202428
202537
202625

Period of Record Coverage

1985 to 2026
Days with data per year at Grassy Mountain Oregon 42 years of record at Grassy Mountain Oregon, 1985 to 2026. 2 years have data for under 90 percent of days and are left out of rankings: 1985, 2026. 1985: 285 of 365 days1986: 356 of 365 days1987: 356 of 365 days1988: 330 of 366 days1989: 361 of 365 days1990: 360 of 365 days1991: 364 of 365 days1992: 365 of 366 days1993: 356 of 365 days1994: 363 of 365 days1995: 363 of 365 days1996: 365 of 366 days1997: 362 of 365 days1998: 365 of 365 days1999: 364 of 365 days2000: 366 of 366 days2001: 365 of 365 days2002: 365 of 365 days2003: 365 of 365 days2004: 364 of 366 days2005: 364 of 365 days2006: 365 of 365 days2007: 365 of 365 days2008: 366 of 366 days2009: 364 of 365 days2010: 365 of 365 days2011: 364 of 365 days2012: 366 of 366 days2013: 364 of 365 days2014: 364 of 365 days2015: 364 of 365 days2016: 364 of 366 days2017: 363 of 365 days2018: 365 of 365 days2019: 365 of 365 days2020: 363 of 366 days2021: 363 of 365 days2022: 365 of 365 days2023: 365 of 365 days2024: 366 of 366 days2025: 365 of 365 days2026: 284 of 365 days1990200020102020
42 years of record at Grassy Mountain Oregon, 1985 to 2026. 2 years have data for under 90 percent of days and are left out of rankings: 1985, 2026.
Days with data per year at Grassy Mountain Oregon
YearDays with dataShare of yearComplete
198528578%No
198635698%Yes
198735698%Yes
198833090%Yes
198936199%Yes
199036099%Yes
1991364100%Yes
1992365100%Yes
199335698%Yes
199436399%Yes
199536399%Yes
1996365100%Yes
199736299%Yes
1998365100%Yes
1999364100%Yes
2000366100%Yes
2001365100%Yes
2002365100%Yes
2003365100%Yes
200436499%Yes
2005364100%Yes
2006365100%Yes
2007365100%Yes
2008366100%Yes
2009364100%Yes
2010365100%Yes
2011364100%Yes
2012366100%Yes
2013364100%Yes
2014364100%Yes
2015364100%Yes
201636499%Yes
201736399%Yes
2018365100%Yes
2019365100%Yes
202036399%Yes
202136399%Yes
2022365100%Yes
2023365100%Yes
2024366100%Yes
2025365100%Yes
202628478%No

Latest Records

20
Latest records at Grassy Mountain Oregon
DateStationRecordValueBeat old record byOld record stoodSignificance
7 October 2026Grassy Mountain Oregon, USdaily high min (Provisional)15.6 C (60.1 F)1.7 C (3.1 F)1 year7 of 100 (Routine)
7 October 2026Grassy Mountain Oregon, USdaily high max (Provisional)30.0 C (86.0 F)0.6 C (1.1 F)1 year4 of 100 (Routine)
6 October 2026Grassy Mountain Oregon, USdaily high min (Provisional)14.4 C (57.9 F)2.2 C (4.0 F)23 years14 of 100 (Routine)
6 October 2026Grassy Mountain Oregon, USdaily high max (Provisional)28.9 C (84.0 F)0.6 C (1.1 F)23 years10 of 100 (Routine)
5 October 2026Grassy Mountain Oregon, USdaily high min (Provisional)15.6 C (60.1 F)3.4 C (6.1 F)12 years14 of 100 (Routine)
5 October 2026Grassy Mountain Oregon, USdaily high max (Provisional)28.9 C (84.0 F)1.7 C (3.1 F)23 years12 of 100 (Routine)
4 October 2026Grassy Mountain Oregon, USdaily high max (Provisional)31.7 C (89.1 F)1.7 C (3.1 F)32 years15 of 100 (Routine)
4 October 2026Grassy Mountain Oregon, USdaily high min (Provisional)15.0 C (59.0 F)0.6 C (1.1 F)5 years6 of 100 (Routine)
3 October 2026Grassy Mountain Oregon, USdaily high max (Provisional)30.0 C (86.0 F)1.1 C (2.0 F)32 years14 of 100 (Routine)
26 August 2026Grassy Mountain Oregon, USdaily high min (Provisional)20.0 C (68.0 F)2.2 C (4.0 F)3 years9 of 100 (Routine)
22 August 2026Grassy Mountain Oregon, USdaily high min (Provisional)21.1 C (70.0 F)2.8 C (5.0 F)35 years21 of 100 (Routine)
21 August 2026Grassy Mountain Oregon, USdaily high min (Provisional)21.1 C (70.0 F)1.7 C (3.1 F)31 years17 of 100 (Routine)
20 August 2026Grassy Mountain Oregon, USdaily high min (Tie, Provisional)19.4 C (66.9 F)tie16 years2 of 100 (Routine)
7 August 2026Grassy Mountain Oregon, USdaily high min22.2 C (72.0 F)2.2 C (4.0 F)20 years15 of 100 (Routine)
24 July 2026Grassy Mountain Oregon, USdaily high max37.8 C (100.0 F)0.6 C (1.1 F)1 year5 of 100 (Routine)
18 July 2026Grassy Mountain Oregon, USdaily high min (Tie)20.6 C (69.1 F)tie4 years1 of 100 (Routine)
28 June 2026Grassy Mountain Oregon, USdaily low min4.4 C (39.9 F)1.2 C (2.2 F)5 years7 of 100 (Routine)
28 June 2026Grassy Mountain Oregon, USdaily low max14.4 C (57.9 F)0.6 C (1.1 F)5 years5 of 100 (Routine)
16 June 2026Grassy Mountain Oregon, USdaily high max34.4 C (93.9 F)1.7 C (3.1 F)37 years17 of 100 (Routine)
18 May 2026Grassy Mountain Oregon, USdaily low min (Tie)-1.7 C (28.9 F)tie23 years2 of 100 (Routine)

Climate Trend

39 complete years, 1986 to 2025
Annual mean temperature at Grassy Mountain Oregon as warming stripes, 1986 to 2025 One stripe for each of 39 complete years at Grassy Mountain Oregon, 1986 to 2025. Blue stripes are years cooler than the station's own mean of 10.0 C (50.1 F); red stripes are warmer. The coolest year was 1993, at 8.1 C (46.5 F), and the warmest was 2025, at 11.3 C (52.4 F). The strongest colour marks a difference of 2.0 C (3.6 F). 1986: 9.6 C, -0.4 C from the station mean1987: 9.5 C, -0.5 C from the station mean1989: 8.7 C, -1.3 C from the station mean1990: 9.4 C, -0.6 C from the station mean1991: 9.4 C, -0.7 C from the station mean1992: 10.7 C, +0.6 C from the station mean1993: 8.1 C, -2.0 C from the station mean1994: 10.3 C, +0.3 C from the station mean1995: 10.0 C, -0.1 C from the station mean1996: 10.0 C, -0.1 C from the station mean1997: 9.9 C, -0.1 C from the station mean1998: 9.7 C, -0.4 C from the station mean1999: 10.0 C, -0.1 C from the station mean2000: 10.3 C, +0.2 C from the station mean2001: 10.1 C, +0.1 C from the station mean2002: 10.0 C, 0.0 C from the station mean2003: 11.0 C, +0.9 C from the station mean2004: 10.0 C, 0.0 C from the station mean2005: 9.5 C, -0.5 C from the station mean2006: 10.2 C, +0.1 C from the station mean2007: 10.6 C, +0.5 C from the station mean2008: 9.5 C, -0.6 C from the station mean2009: 9.5 C, -0.5 C from the station mean2010: 10.2 C, +0.2 C from the station mean2011: 9.5 C, -0.6 C from the station mean2012: 10.8 C, +0.7 C from the station mean2013: 9.7 C, -0.4 C from the station mean2014: 10.9 C, +0.9 C from the station mean2015: 11.1 C, +1.1 C from the station mean2016: 10.5 C, +0.5 C from the station mean2017: 10.0 C, -0.1 C from the station mean2018: 10.3 C, +0.3 C from the station mean2019: 9.4 C, -0.7 C from the station mean2020: 10.7 C, +0.6 C from the station mean2021: 10.9 C, +0.8 C from the station mean2022: 9.9 C, -0.2 C from the station mean2023: 9.7 C, -0.4 C from the station mean2024: 10.8 C, +0.8 C from the station mean2025: 11.3 C, +1.3 C from the station mean198619901995200020052010201520202025
One stripe for each of 39 complete years at Grassy Mountain Oregon, 1986 to 2025. Blue stripes are years cooler than the station's own mean of 10.0 C (50.1 F); red stripes are warmer. The coolest year was 1993, at 8.1 C (46.5 F), and the warmest was 2025, at 11.3 C (52.4 F). The strongest colour marks a difference of 2.0 C (3.6 F).
Annual mean temperature at Grassy Mountain Oregon as warming stripes, 1986 to 2025
YearAnnual mean temperatureDifference from the station mean
19869.6 C-0.41 C
19879.5 C-0.55 C
19898.7 C-1.30 C
19909.4 C-0.60 C
19919.4 C-0.66 C
199210.7 C+0.62 C
19938.1 C-1.98 C
199410.3 C+0.28 C
199510.0 C-0.06 C
199610.0 C-0.06 C
19979.9 C-0.11 C
19989.7 C-0.39 C
199910.0 C-0.06 C
200010.3 C+0.22 C
200110.1 C+0.09 C
200210.0 C-0.03 C
200311.0 C+0.92 C
200410.0 C-0.01 C
20059.5 C-0.53 C
200610.2 C+0.14 C
200710.6 C+0.52 C
20089.5 C-0.57 C
20099.5 C-0.51 C
201010.2 C+0.17 C
20119.5 C-0.58 C
201210.8 C+0.71 C
20139.7 C-0.36 C
201410.9 C+0.88 C
201511.1 C+1.08 C
201610.5 C+0.49 C
201710.0 C-0.07 C
201810.3 C+0.25 C
20199.4 C-0.68 C
202010.7 C+0.64 C
202110.9 C+0.83 C
20229.9 C-0.18 C
20239.7 C-0.38 C
202410.8 C+0.77 C
202511.3 C+1.29 C

The annual mean temperature here has risen by 0.3 C (0.1 to 0.4) per decade over 1986 to 2025. In Fahrenheit: 0.5 F (0.2 to 0.8) per decade. The slope is a straight line fitted to 39 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Grassy Mountain Oregon
MeasurePer decade (C)Per decade (F)PeriodComplete yearsReading
Annual mean temperature0.3 C (0.1 to 0.4) per decade0.5 F (0.2 to 0.8) per decade1986 to 202539Rise
Mean daily maximum0.3 C (0.1 to 0.5) per decade0.6 F (0.2 to 1.0) per decade1986 to 202539Rise
Mean daily minimum0.2 C (0.1 to 0.4) per decade0.4 F (0.1 to 0.7) per decade1986 to 202539Rise

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 Grassy Mountain Oregon: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)42.8 C (109.0 F)200238.3 C (100.9 F)42
Coldest night (TNn)-29.4 C (-20.9 F)1990-16.4 C (2.5 F)42

Hottest day (TXx)

Hottest day (TXx) at Grassy Mountain Oregon by year The hottest day of the year at Grassy Mountain Oregon, 1985 to 2026. The record is 42.8 C (109.0 F) in 2002, marked on the chart; the median year is 38.3 C (100.9 F). 32.53537.54042.5451990200020102020Record: 42.8 C (109.0 F) in 2002
The hottest day of the year at Grassy Mountain Oregon, 1985 to 2026. The record is 42.8 C (109.0 F) in 2002, marked on the chart; the median year is 38.3 C (100.9 F).
Hottest day (TXx) at Grassy Mountain Oregon by year
YearHottest day (TXx)
198535.1 C (95.2 F)
198635.5 C (95.9 F)
198733.9 C (93.0 F)
198836.7 C (98.1 F)
198937.4 C (99.3 F)
199040.0 C (104.0 F)
199136.7 C (98.1 F)
199238.3 C (100.9 F)
199334.4 C (93.9 F)
199437.8 C (100.0 F)
199535.6 C (96.1 F)
199638.3 C (100.9 F)
199736.7 C (98.1 F)
199839.4 C (102.9 F)
199937.2 C (99.0 F)
200038.3 C (100.9 F)
200140.0 C (104.0 F)
200242.8 C (109.0 F)
200341.1 C (106.0 F)
200437.2 C (99.0 F)
200538.3 C (100.9 F)
200640.0 C (104.0 F)
200738.9 C (102.0 F)
200837.8 C (100.0 F)
200938.3 C (100.9 F)
201038.3 C (100.9 F)
201136.1 C (97.0 F)
201238.9 C (102.0 F)
201339.4 C (102.9 F)
201438.3 C (100.9 F)
201539.4 C (102.9 F)
201636.7 C (98.1 F)
201737.8 C (100.0 F)
201839.4 C (102.9 F)
201936.1 C (97.0 F)
202039.4 C (102.9 F)
202138.3 C (100.9 F)
202239.4 C (102.9 F)
202338.3 C (100.9 F)
202440.0 C (104.0 F)
202537.2 C (99.0 F)
202637.8 C (100.0 F)

Coldest night (TNn)

Coldest night (TNn) at Grassy Mountain Oregon by year The coldest night of the year at Grassy Mountain Oregon, 1985 to 2026. The record is -29.4 C (-20.9 F) in 1990, marked on the chart; the median year is -16.4 C (2.5 F). -30-25-20-15-101990200020102020Record: -29.4 C (-20.9 F) in 1990
The coldest night of the year at Grassy Mountain Oregon, 1985 to 2026. The record is -29.4 C (-20.9 F) in 1990, marked on the chart; the median year is -16.4 C (2.5 F).
Coldest night (TNn) at Grassy Mountain Oregon by year
YearColdest night (TNn)
1985-19.4 C (-2.9 F)
1986-13.9 C (7.0 F)
1987-18.2 C (-0.8 F)
1988-19.8 C (-3.6 F)
1989-22.9 C (-9.2 F)
1990-29.4 C (-20.9 F)
1991-14.4 C (6.1 F)
1992-17.8 C (0.0 F)
1993-17.2 C (1.0 F)
1994-12.8 C (9.0 F)
1995-13.9 C (7.0 F)
1996-20.0 C (-4.0 F)
1997-16.7 C (1.9 F)
1998-21.1 C (-6.0 F)
1999-13.3 C (8.1 F)
2000-10.6 C (12.9 F)
2001-14.4 C (6.1 F)
2002-14.4 C (6.1 F)
2003-13.9 C (7.0 F)
2004-13.9 C (7.0 F)
2005-15.6 C (3.9 F)
2006-17.2 C (1.0 F)
2007-17.8 C (0.0 F)
2008-17.8 C (0.0 F)
2009-17.8 C (0.0 F)
2010-16.1 C (3.0 F)
2011-15.0 C (5.0 F)
2012-13.9 C (7.0 F)
2013-21.1 C (-6.0 F)
2014-18.3 C (-0.9 F)
2015-17.8 C (0.0 F)
2016-19.4 C (-2.9 F)
2017-21.7 C (-7.1 F)
2018-15.6 C (3.9 F)
2019-14.4 C (6.1 F)
2020-13.3 C (8.1 F)
2021-12.8 C (9.0 F)
2022-17.8 C (0.0 F)
2023-18.9 C (-2.0 F)
2024-15.6 C (3.9 F)
2025-15.6 C (3.9 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

39 years with a frost

Across 39 years with a frost, the median last spring frost at Grassy Mountain Oregon falls on 20 May and the median first autumn frost on 7 October, which leaves a median of 140 days between them.

Fitted over all years, the growing season changes by +7.8 days per decade at this station.

Frost dates and growing season at Grassy Mountain Oregon
MeasureMedian, all yearsEarliest periodRecent period (1996 to 2025)Recent against earliestFitted trend
Last spring frost20 Mayn/a20 Mayn/a-4.8 days per decade
First autumn frost7 Octobern/a8 Octobern/a+3.0 days per decade
Growing days140 daysn/a140 daysn/a+7.8 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 Grassy Mountain Oregon standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Grassy Mountain 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 2026-10-13 (13 October 2026). Records are computed by this site and are not official.

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