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Mt Hood Test Site Weather Records (USS0021D08S)

Record envelope, standing records and threshold days for Mt Hood Test Site (USS0021D08S), Oregon, United States, with 47 years of record.

Key Facts for Mt Hood Test Site

  • Mt Hood Test Site (USS0021D08S) is a weather station in Oregon, United States at 45.32 latitude and -121.72 longitude, 1,637 m (5,370 ft) above sea level.
  • The station reports from 1980 to 2026, 47 years of record.
  • 1,464 records set at Mt Hood Test Site still stand.
  • Records are tracked for tmax, tmin, prcp, snwd: an element needs 30 years of data to be eligible.
  • Mt Hood Test Site set a daily record high maximum temperature of 22.4 C (72.3 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, 45.32 latitude, -121.72 longitude.
  • Elevation: 1,637 m (5,370 ft).
  • Period of record: 1980 to 2026, 47 years.
  • Eligible elements: tmax, tmin, prcp, snwd.

Daily Record Envelope and 2026

11 days at or beyond a record
Daily record high and record low at Mt Hood Test Site, with 2026 drawn through them The band shows the record high and record low for each calendar day at Mt Hood Test Site. The lines show the 2026 daily maximum and minimum. 11 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 Hood Test Site. The lines show the 2026 daily maximum and minimum. 11 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Mt Hood Test Site, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan22.2 C (72.0 F)-17.6 C (0.3 F)17.1 C (62.8 F)-11.2 C (11.8 F)
Feb22.2 C (72.0 F)-20.5 C (-4.9 F)14.1 C (57.4 F)-8.9 C (16.0 F)
Mar21.8 C (71.2 F)-14.7 C (5.5 F)14.4 C (57.9 F)-8.5 C (16.7 F)
Apr22.8 C (73.0 F)-12.7 C (9.1 F)16.8 C (62.2 F)-7.2 C (19.0 F)
May25.6 C (78.1 F)-8.8 C (16.2 F)20.8 C (69.4 F)-3.7 C (25.3 F)
Jun33.8 C (92.8 F)-6.6 C (20.1 F)25.4 C (77.7 F)-1.5 C (29.3 F)
Jul31.3 C (88.3 F)-2.3 C (27.9 F)27.3 C (81.1 F)0.2 C (32.4 F)
Aug31.3 C (88.3 F)-1.3 C (29.7 F)27.0 C (80.6 F)2.3 C (36.1 F)
Sep30.2 C (86.4 F)-6.6 C (20.1 F)22.9 C (73.2 F)-1.5 C (29.3 F)
Oct25.2 C (77.4 F)-10.6 C (12.9 F)22.4 C (72.3 F)-2.4 C (27.7 F)
Nov23.4 C (74.1 F)-18.7 C (-1.7 F)n/an/a
Dec22.6 C (72.7 F)-26.5 C (-15.7 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Mt Hood Test Site by the year they were set 1,464 records at Mt Hood Test Site still stand. 1989 holds the most, with 124. 0501001501983: 241984: 561985: 401986: 361987: 261988: 1221989: 1241990: 351991: 421992: 321993: 311994: 271995: 201996: 411997: 91998: 141999: 312000: 222001: 222002: 302003: 232004: 192005: 182006: 262007: 222008: 592009: 352010: 192011: 312012: 252013: 302014: 202015: 252016: 302017: 432018: 192019: 362020: 202021: 282022: 482023: 282024: 302025: 212026: 25198319881993199820032008201320182023
1,464 records at Mt Hood Test Site still stand. 1989 holds the most, with 124.
Standing records at Mt Hood Test Site by the year they were set
Year setStanding records
198324
198456
198540
198636
198726
1988122
1989124
199035
199142
199232
199331
199427
199520
199641
19979
199814
199931
200022
200122
200230
200323
200419
200518
200626
200722
200859
200935
201019
201131
201225
201330
201420
201525
201630
201743
201819
201936
202020
202128
202248
202328
202430
202521
202625

All-Time Record Progression

3 new records
When Mt Hood Test Site set new all-time records 3 all-time records were set at Mt Hood Test Site between 28 June 2021 and 29 June 2021. Each dot is a new record. Record high maximum temperatureRecord high minimum temperature28 June 2021: Record high maximum temperature 32.1 C (89.8 F)28 June 2021: Record high minimum temperature 24.3 C (75.7 F)29 June 2021: Record high maximum temperature 33.8 C (92.8 F)
3 all-time records were set at Mt Hood Test Site between 28 June 2021 and 29 June 2021. Each dot is a new record.
When Mt Hood Test Site set new all-time records
DateKindDetail
2021-06-28Record high maximum temperatureRecord high maximum temperature 32.1 C (89.8 F)
2021-06-28Record high minimum temperatureRecord high minimum temperature 24.3 C (75.7 F)
2021-06-29Record high maximum temperatureRecord high maximum temperature 33.8 C (92.8 F)

Wettest Day of Each Month

Nov: 162.6 mm (6.4 in)
Record daily precipitation for each month at Mt Hood Test Site The wettest day on record for each calendar month at Mt Hood Test Site. The most was 162.6 mm (6.4 in) on 25 November 1999. 050100150200 Jan: 134.6 mm (5.3 in), 6 January 2009 Jan Feb: 127.0 mm (5.0 in), 6 February 1996 Feb Mar: 94.0 mm (3.7 in), 16 March 1997 Mar Apr: 96.5 mm (3.8 in), 27 April 1990 Apr May: 68.6 mm (2.7 in), 16 May 2017 May Jun: 68.6 mm (2.7 in), 6 June 1995 Jun Jul: 30.5 mm (1.2 in), 3 July 1981 Jul Aug: 61.0 mm (2.4 in), 22 August 2004 Aug Sep: 96.5 mm (3.8 in), 30 September 2000 Sep Oct: 147.3 mm (5.8 in), 31 October 1994 Oct Nov: 162.6 mm (6.4 in), 25 November 1999 Nov Dec: 127.0 mm (5.0 in), 16 December 2001 Dec
The wettest day on record for each calendar month at Mt Hood Test Site. The most was 162.6 mm (6.4 in) on 25 November 1999.
Record daily precipitation for each month at Mt Hood Test Site
MonthRecord daily precipitation (mm)Date
Jan134.6 mm (5.3 in)6 January 2009
Feb127.0 mm (5.0 in)6 February 1996
Mar94.0 mm (3.7 in)16 March 1997
Apr96.5 mm (3.8 in)27 April 1990
May68.6 mm (2.7 in)16 May 2017
Jun68.6 mm (2.7 in)6 June 1995
Jul30.5 mm (1.2 in)3 July 1981
Aug61.0 mm (2.4 in)22 August 2004
Sep96.5 mm (3.8 in)30 September 2000
Oct147.3 mm (5.8 in)31 October 1994
Nov162.6 mm (6.4 in)25 November 1999
Dec127.0 mm (5.0 in)16 December 2001

Period of Record Coverage

1983 to 2026
Days with data per year at Mt Hood Test Site 44 years of record at Mt Hood Test Site, 1983 to 2026. 4 years have data for under 90 percent of days and are left out of rankings: 1983, 1984, 1985, 2026. 1983: 206 of 365 days1984: 264 of 366 days1985: 139 of 365 days1986: 347 of 365 days1987: 332 of 365 days1988: 351 of 366 days1989: 354 of 365 days1990: 352 of 365 days1991: 352 of 365 days1992: 362 of 366 days1993: 336 of 365 days1994: 351 of 365 days1995: 364 of 365 days1996: 366 of 366 days1997: 364 of 365 days1998: 365 of 365 days1999: 361 of 365 days2000: 366 of 366 days2001: 365 of 365 days2002: 365 of 365 days2003: 364 of 365 days2004: 365 of 366 days2005: 365 of 365 days2006: 361 of 365 days2007: 365 of 365 days2008: 366 of 366 days2009: 364 of 365 days2010: 365 of 365 days2011: 365 of 365 days2012: 365 of 366 days2013: 365 of 365 days2014: 365 of 365 days2015: 365 of 365 days2016: 365 of 366 days2017: 365 of 365 days2018: 365 of 365 days2019: 365 of 365 days2020: 365 of 366 days2021: 365 of 365 days2022: 365 of 365 days2023: 365 of 365 days2024: 349 of 366 days2025: 341 of 365 days2026: 286 of 365 days1990200020102020
44 years of record at Mt Hood Test Site, 1983 to 2026. 4 years have data for under 90 percent of days and are left out of rankings: 1983, 1984, 1985, 2026.
Days with data per year at Mt Hood Test Site
YearDays with dataShare of yearComplete
198320656%No
198426472%No
198513938%No
198634795%Yes
198733291%Yes
198835196%Yes
198935497%Yes
199035296%Yes
199135296%Yes
199236299%Yes
199333692%Yes
199435196%Yes
1995364100%Yes
1996366100%Yes
1997364100%Yes
1998365100%Yes
199936199%Yes
2000366100%Yes
2001365100%Yes
2002365100%Yes
2003364100%Yes
2004365100%Yes
2005365100%Yes
200636199%Yes
2007365100%Yes
2008366100%Yes
2009364100%Yes
2010365100%Yes
2011365100%Yes
2012365100%Yes
2013365100%Yes
2014365100%Yes
2015365100%Yes
2016365100%Yes
2017365100%Yes
2018365100%Yes
2019365100%Yes
2020365100%Yes
2021365100%Yes
2022365100%Yes
2023365100%Yes
202434995%Yes
202534193%Yes
202628678%No

Latest Records

20
Latest records at Mt Hood Test Site
DateStationRecordValueBeat old record byOld record stoodSignificance
7 October 2026Mt Hood Test Site, USdaily high max (Provisional)22.4 C (72.3 F)2.3 C (4.1 F)37 years18 of 100 (Routine)
12 September 2026Mt Hood Test Site, USdaily rain (Tie, Provisional)7.6 mm (0.30 in)tie44 years4 of 100 (Routine)
2 September 2026Mt Hood Test Site, USdaily rain (Tie, Provisional)22.9 mm (0.9 in)tie21 years2 of 100 (Routine)
27 August 2026Mt Hood Test Site, USdaily rain (Tie, Provisional)5.1 mm (0.20 in)tie8 years1 of 100 (Routine)
21 August 2026Mt Hood Test Site, USdaily high min (Provisional)16.4 C (61.5 F)1.6 C (2.9 F)35 years17 of 100 (Routine)
20 August 2026Mt Hood Test Site, USdaily high max (Provisional)27.0 C (80.6 F)0.4 C (0.7 F)20 years10 of 100 (Routine)
20 August 2026Mt Hood Test Site, USdaily high min (Provisional)16.4 C (61.5 F)1.5 C (2.7 F)9 years9 of 100 (Routine)
6 August 2026Mt Hood Test Site, USdaily high max26.7 C (80.1 F)0.7 C (1.3 F)7 years7 of 100 (Routine)
5 August 2026Mt Hood Test Site, USdaily high max27.0 C (80.6 F)0.1 C (0.2 F)28 years12 of 100 (Routine)
2 August 2026Mt Hood Test Site, USdaily low min2.3 C (36.1 F)0.5 C (0.9 F)29 years13 of 100 (Routine)
27 June 2026Mt Hood Test Site, USdaily rain43.2 mm (1.7 in)15.3 mm (0.6 in)12 years22 of 100 (Routine)
27 June 2026Mt Hood Test Site, USdaily low max3.9 C (39.0 F)1.7 C (3.1 F)37 years17 of 100 (Routine)
19 June 2026Mt Hood Test Site, USdaily high min9.8 C (49.6 F)0.4 C (0.7 F)33 years14 of 100 (Routine)
19 June 2026Mt Hood Test Site, USdaily high max22.8 C (73.0 F)0.3 C (0.5 F)8 years6 of 100 (Routine)
18 June 2026Mt Hood Test Site, USdaily high max22.5 C (72.5 F)1.3 C (2.3 F)33 years15 of 100 (Routine)
18 June 2026Mt Hood Test Site, USdaily high min10.3 C (50.5 F)1.1 C (2.0 F)32 years15 of 100 (Routine)
15 June 2026Mt Hood Test Site, USdaily high min15.5 C (59.9 F)4.8 C (8.6 F)11 years17 of 100 (Routine)
15 June 2026Mt Hood Test Site, USdaily high max25.4 C (77.7 F)3.8 C (6.8 F)11 years12 of 100 (Routine)
14 June 2026Mt Hood Test Site, USdaily high min12.8 C (55.0 F)0.5 C (0.9 F)27 years13 of 100 (Routine)
13 June 2026Mt Hood Test Site, USdaily high min11.2 C (52.2 F)0.5 C (0.9 F)39 years16 of 100 (Routine)

Climate Trend

36 complete years, 1986 to 2024
Annual mean temperature at Mt Hood Test Site as warming stripes, 1986 to 2024 One stripe for each of 36 complete years at Mt Hood Test Site, 1986 to 2024. Blue stripes are years cooler than the station's own mean of 4.2 C (39.5 F); red stripes are warmer. The coolest year was 1990, at 2.4 C (36.3 F), and the warmest was 2015, at 6.3 C (43.3 F). The strongest colour marks a difference of 2.2 C (4.0 F). 1986: 4.2 C, 0.0 C from the station mean1990: 2.4 C, -1.8 C from the station mean1991: 3.2 C, -0.9 C from the station mean1992: 5.3 C, +1.1 C from the station mean1993: 3.3 C, -0.9 C from the station mean1994: 4.1 C, -0.1 C from the station mean1995: 4.0 C, -0.2 C from the station mean1996: 3.7 C, -0.5 C from the station mean1997: 3.7 C, -0.5 C from the station mean1998: 4.0 C, -0.2 C from the station mean1999: 3.6 C, -0.6 C from the station mean2000: 3.5 C, -0.7 C from the station mean2001: 4.0 C, -0.2 C from the station mean2002: 4.1 C, -0.1 C from the station mean2003: 4.6 C, +0.4 C from the station mean2004: 4.8 C, +0.6 C from the station mean2005: 4.4 C, +0.2 C from the station mean2006: 4.0 C, -0.2 C from the station mean2007: 4.0 C, -0.2 C from the station mean2008: 3.6 C, -0.6 C from the station mean2009: 4.1 C, -0.1 C from the station mean2010: 3.5 C, -0.7 C from the station mean2011: 3.0 C, -1.1 C from the station mean2012: 4.0 C, -0.1 C from the station mean2013: 4.6 C, +0.4 C from the station mean2014: 5.2 C, +1.0 C from the station mean2015: 6.3 C, +2.1 C from the station mean2016: 4.5 C, +0.3 C from the station mean2017: 4.5 C, +0.3 C from the station mean2018: 4.6 C, +0.4 C from the station mean2019: 3.9 C, -0.2 C from the station mean2020: 4.6 C, +0.4 C from the station mean2021: 4.5 C, +0.3 C from the station mean2022: 5.0 C, +0.8 C from the station mean2023: 4.7 C, +0.5 C from the station mean2024: 5.0 C, +0.8 C from the station mean19861990199520002005201020152020
One stripe for each of 36 complete years at Mt Hood Test Site, 1986 to 2024. Blue stripes are years cooler than the station's own mean of 4.2 C (39.5 F); red stripes are warmer. The coolest year was 1990, at 2.4 C (36.3 F), and the warmest was 2015, at 6.3 C (43.3 F). The strongest colour marks a difference of 2.2 C (4.0 F).
Annual mean temperature at Mt Hood Test Site as warming stripes, 1986 to 2024
YearAnnual mean temperatureDifference from the station mean
19864.2 C-0.01 C
19902.4 C-1.78 C
19913.2 C-0.94 C
19925.3 C+1.09 C
19933.3 C-0.86 C
19944.1 C-0.08 C
19954.0 C-0.20 C
19963.7 C-0.46 C
19973.7 C-0.52 C
19984.0 C-0.17 C
19993.6 C-0.63 C
20003.5 C-0.66 C
20014.0 C-0.22 C
20024.1 C-0.10 C
20034.6 C+0.43 C
20044.8 C+0.64 C
20054.4 C+0.24 C
20064.0 C-0.22 C
20074.0 C-0.23 C
20083.6 C-0.60 C
20094.1 C-0.06 C
20103.5 C-0.73 C
20113.0 C-1.15 C
20124.0 C-0.15 C
20134.6 C+0.40 C
20145.2 C+1.02 C
20156.3 C+2.11 C
20164.5 C+0.33 C
20174.5 C+0.30 C
20184.6 C+0.40 C
20193.9 C-0.24 C
20204.6 C+0.43 C
20214.5 C+0.33 C
20225.0 C+0.80 C
20234.7 C+0.54 C
20245.0 C+0.80 C

The annual mean temperature here has risen by 0.3 C (0.1 to 0.5) per decade over 1986 to 2024. In Fahrenheit: 0.6 F (0.2 to 1.0) per decade. The slope is a straight line fitted to 36 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Mt Hood Test Site
MeasurePer decade (C)Per decade (F)PeriodComplete yearsReading
Annual mean temperature0.3 C (0.1 to 0.5) per decade0.6 F (0.2 to 1.0) per decade1986 to 202436Rise
Mean daily maximum0.4 C (0.2 to 0.6) per decade0.8 F (0.4 to 1.2) per decade1986 to 202436Rise
Mean daily minimum0.24 C (0.03 to 0.44) per decade0.4 F (0.1 to 0.8) per decade1986 to 202436Rise

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

1980 to 2026
Yearly extremes at Mt Hood Test Site: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)33.8 C (92.8 F)202128.1 C (82.6 F)44
Coldest night (TNn)-26.5 C (-15.7 F)1990-15.9 C (3.4 F)44
Wettest day (Rx1day)162.6 mm (6.4 in)199988.9 mm (3.5 in)47
Wettest five days (Rx5day)304.8 mm (12.0 in)1994215.9 mm (8.5 in)47
Longest dry spell (CDD)73 days201826 days47

Hottest day (TXx)

Hottest day (TXx) at Mt Hood Test Site by year The hottest day of the year at Mt Hood Test Site, 1980 to 2026. The record is 33.8 C (92.8 F) in 2021, marked on the chart; the median year is 28.1 C (82.6 F). 2025303519801990200020102020Record: 33.8 C (92.8 F) in 2021
The hottest day of the year at Mt Hood Test Site, 1980 to 2026. The record is 33.8 C (92.8 F) in 2021, marked on the chart; the median year is 28.1 C (82.6 F).
Hottest day (TXx) at Mt Hood Test Site by year
YearHottest day (TXx)
1980n/a
1981n/a
1982n/a
198323.7 C (74.7 F)
198424.1 C (75.4 F)
198520.8 C (69.4 F)
198625.7 C (78.3 F)
198726.8 C (80.2 F)
198828.4 C (83.1 F)
198922.8 C (73.0 F)
199025.8 C (78.4 F)
199125.5 C (77.9 F)
199228.9 C (84.0 F)
199324.9 C (76.8 F)
199429.3 C (84.7 F)
199524.9 C (76.8 F)
199628.9 C (84.0 F)
199726.9 C (80.4 F)
199830.5 C (86.9 F)
199925.3 C (77.5 F)
200026.2 C (79.2 F)
200126.9 C (80.4 F)
200230.6 C (87.1 F)
200329.1 C (84.4 F)
200428.9 C (84.0 F)
200528.5 C (83.3 F)
200626.8 C (80.2 F)
200728.2 C (82.8 F)
200831.3 C (88.3 F)
200929.2 C (84.6 F)
201027.7 C (81.9 F)
201128.0 C (82.4 F)
201229.4 C (84.9 F)
201327.5 C (81.5 F)
201428.0 C (82.4 F)
201530.4 C (86.7 F)
201627.8 C (82.0 F)
201730.2 C (86.4 F)
201829.6 C (85.3 F)
201926.4 C (79.5 F)
202029.0 C (84.2 F)
202133.8 C (92.8 F)
202231.3 C (88.3 F)
202329.0 C (84.2 F)
202430.5 C (86.9 F)
202529.3 C (84.7 F)
202627.3 C (81.1 F)

Coldest night (TNn)

Coldest night (TNn) at Mt Hood Test Site by year The coldest night of the year at Mt Hood Test Site, 1980 to 2026. The record is -26.5 C (-15.7 F) in 1990, marked on the chart; the median year is -15.9 C (3.4 F). -30-25-20-15-10-519801990200020102020Record: -26.5 C (-15.7 F) in 1990
The coldest night of the year at Mt Hood Test Site, 1980 to 2026. The record is -26.5 C (-15.7 F) in 1990, marked on the chart; the median year is -15.9 C (3.4 F).
Coldest night (TNn) at Mt Hood Test Site by year
YearColdest night (TNn)
1980n/a
1981n/a
1982n/a
1983-26.4 C (-15.5 F)
1984-16.2 C (2.8 F)
1985-17.9 C (-0.2 F)
1986-10.6 C (12.9 F)
1987-13.8 C (7.2 F)
1988-16.3 C (2.7 F)
1989-9.9 C (14.2 F)
1990-26.5 C (-15.7 F)
1991-13.5 C (7.7 F)
1992-10.6 C (12.9 F)
1993-17.6 C (0.3 F)
1994-17.6 C (0.3 F)
1995-17.1 C (1.2 F)
1996-17.6 C (0.3 F)
1997-12.7 C (9.1 F)
1998-22.8 C (-9.0 F)
1999-10.4 C (13.3 F)
2000-11.4 C (11.5 F)
2001-12.5 C (9.5 F)
2002-13.9 C (7.0 F)
2003-13.0 C (8.6 F)
2004-14.5 C (5.9 F)
2005-11.1 C (12.0 F)
2006-16.8 C (1.8 F)
2007-17.1 C (1.2 F)
2008-16.7 C (1.9 F)
2009-19.9 C (-3.8 F)
2010-18.7 C (-1.7 F)
2011-18.6 C (-1.5 F)
2012-12.3 C (9.9 F)
2013-18.5 C (-1.3 F)
2014-20.5 C (-4.9 F)
2015-11.8 C (10.8 F)
2016-14.9 C (5.2 F)
2017-14.5 C (5.9 F)
2018-16.5 C (2.3 F)
2019-15.4 C (4.3 F)
2020-12.6 C (9.3 F)
2021-14.9 C (5.2 F)
2022-18.3 C (-0.9 F)
2023-16.5 C (2.3 F)
2024-16.0 C (3.2 F)
2025-15.8 C (3.6 F)
2026-11.2 C (11.8 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at Mt Hood Test Site by year The wettest day of the year at Mt Hood Test Site, 1980 to 2026. The record is 162.6 mm (6.4 in) in 1999, marked on the chart; the median year is 88.9 mm (3.5 in). 5010015020019801990200020102020Record: 162.6 mm (6.4 in) in 1999
The wettest day of the year at Mt Hood Test Site, 1980 to 2026. The record is 162.6 mm (6.4 in) in 1999, marked on the chart; the median year is 88.9 mm (3.5 in).
Wettest day (Rx1day) at Mt Hood Test Site by year
YearWettest day (Rx1day)
1980106.7 mm (4.2 in)
1981104.1 mm (4.1 in)
1982104.1 mm (4.1 in)
198381.3 mm (3.2 in)
198481.3 mm (3.2 in)
198576.2 mm (3.0 in)
1986109.2 mm (4.3 in)
198781.3 mm (3.2 in)
198868.6 mm (2.7 in)
1989119.4 mm (4.7 in)
199096.5 mm (3.8 in)
199183.8 mm (3.3 in)
199283.8 mm (3.3 in)
199376.2 mm (3.0 in)
1994147.3 mm (5.8 in)
1995106.7 mm (4.2 in)
1996127.0 mm (5.0 in)
199794.0 mm (3.7 in)
199896.5 mm (3.8 in)
1999162.6 mm (6.4 in)
200096.5 mm (3.8 in)
2001127.0 mm (5.0 in)
2002116.8 mm (4.6 in)
200383.8 mm (3.3 in)
200499.1 mm (3.9 in)
200578.7 mm (3.1 in)
200691.4 mm (3.6 in)
200786.4 mm (3.4 in)
200888.9 mm (3.5 in)
2009134.6 mm (5.3 in)
201066.0 mm (2.6 in)
2011132.1 mm (5.2 in)
201286.4 mm (3.4 in)
2013116.8 mm (4.6 in)
201478.7 mm (3.1 in)
201583.8 mm (3.3 in)
201671.1 mm (2.8 in)
201794.0 mm (3.7 in)
201866.0 mm (2.6 in)
201966.0 mm (2.6 in)
202061.0 mm (2.4 in)
202188.9 mm (3.5 in)
2022152.4 mm (6.0 in)
202378.7 mm (3.1 in)
202453.3 mm (2.1 in)
2025116.8 mm (4.6 in)
202653.3 mm (2.1 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Mt Hood Test Site by year The wettest five days of the year at Mt Hood Test Site, 1980 to 2026. The record is 304.8 mm (12.0 in) in 1994, marked on the chart; the median year is 215.9 mm (8.5 in). 15020025030035019801990200020102020Record: 304.8 mm (12.0 in) in 1994
The wettest five days of the year at Mt Hood Test Site, 1980 to 2026. The record is 304.8 mm (12.0 in) in 1994, marked on the chart; the median year is 215.9 mm (8.5 in).
Wettest five days (Rx5day) at Mt Hood Test Site by year
YearWettest five days (Rx5day)
1980294.7 mm (11.6 in)
1981233.6 mm (9.2 in)
1982246.4 mm (9.7 in)
1983259.2 mm (10.2 in)
1984203.2 mm (8.0 in)
1985205.7 mm (8.1 in)
1986215.9 mm (8.5 in)
1987165.1 mm (6.5 in)
1988200.7 mm (7.9 in)
1989241.3 mm (9.5 in)
1990208.3 mm (8.2 in)
1991177.8 mm (7.0 in)
1992170.2 mm (6.7 in)
1993175.3 mm (6.9 in)
1994304.8 mm (12.0 in)
1995289.5 mm (11.4 in)
1996276.8 mm (10.9 in)
1997188.0 mm (7.4 in)
1998276.8 mm (10.9 in)
1999299.9 mm (11.8 in)
2000185.5 mm (7.3 in)
2001175.3 mm (6.9 in)
2002302.2 mm (11.9 in)
2003238.7 mm (9.4 in)
2004200.6 mm (7.9 in)
2005210.8 mm (8.3 in)
2006281.9 mm (11.1 in)
2007180.4 mm (7.1 in)
2008261.7 mm (10.3 in)
2009236.2 mm (9.3 in)
2010180.3 mm (7.1 in)
2011248.9 mm (9.8 in)
2012261.7 mm (10.3 in)
2013203.2 mm (8.0 in)
2014223.5 mm (8.8 in)
2015210.9 mm (8.3 in)
2016167.7 mm (6.6 in)
2017203.2 mm (8.0 in)
2018155.0 mm (6.1 in)
2019236.1 mm (9.3 in)
2020195.6 mm (7.7 in)
2021231.2 mm (9.1 in)
2022228.7 mm (9.0 in)
2023221.0 mm (8.7 in)
2024203.3 mm (8.0 in)
2025274.3 mm (10.8 in)
2026170.2 mm (6.7 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Mt Hood Test Site by year The longest dry spell of the year at Mt Hood Test Site, 1980 to 2026. The record is 73 days in 2018, marked on the chart; the median year is 26 days. 02040608019801990200020102020Record: 73 days in 2018
The longest dry spell of the year at Mt Hood Test Site, 1980 to 2026. The record is 73 days in 2018, marked on the chart; the median year is 26 days.
Longest dry spell (CDD) at Mt Hood Test Site by year
YearLongest dry spell (CDD)
198019 days
198132 days
198254 days
198323 days
198438 days
198551 days
198620 days
198733 days
198827 days
198916 days
199027 days
199138 days
199216 days
199339 days
199427 days
199522 days
199626 days
199725 days
199822 days
199916 days
200015 days
200122 days
200222 days
200344 days
200430 days
200519 days
200638 days
200723 days
200823 days
200926 days
201024 days
201118 days
201219 days
201322 days
201424 days
201548 days
201626 days
201731 days
201873 days
201921 days
202029 days
202155 days
202258 days
202370 days
202426 days
202545 days
202658 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

36 years with a frost

Across 36 years with a frost, the median last spring frost at Mt Hood Test Site falls on 19 June and the median first autumn frost on 17 September, which leaves a median of 91 days between them.

Fitted over all years, the growing season changes by +17.7 days per decade at this station.

Frost dates and growing season at Mt Hood Test Site
MeasureMedian, all yearsEarliest periodRecent period (1995 to 2024)Recent against earliestFitted trend
Last spring frost19 Junen/a19 Junen/a-2.3 days per decade
First autumn frost17 Septembern/a19 Septembern/a+15.5 days per decade
Growing days91 daysn/a95 daysn/a+17.7 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.

Rainfall Return Levels

45 years, 1981 to 2025

A day with at least 91.3 mm (3.6 in) of rain is expected about once in 2 years. A day with at least 179.8 mm (7.1 in) of rain is expected about once in 100 years.

Rainfall return levels at Mt Hood Test Site: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years91.3 mm (3.6 in)
5 years114.1 mm (4.5 in)
10 years129.6 mm (5.1 in)
25 years149.5 mm (5.9 in)
50 years164.6 mm (6.5 in)Longer than the 45 years of record
100 years179.8 mm (7.1 in)Longer than the 45 years of record

The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 45 years of values from 1981 to 2025.

A return level is an estimate. It is least reliable for the long periods, 50 and 100 years, and for any period longer than the record behind the fit, where the fit has to reach past the largest day actually observed. It is not a forecast.

The largest wettest-day totals in the fit: 162.6 mm (6.4 in) in 1999; 152.4 mm (6.0 in) in 2022; 147.3 mm (5.8 in) in 1994.

Download the Data

  • Data for Mt Hood Test Site standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Mt Hood Test Site 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).