Cougar Mountain Washington Weather Records (USR0000WCOU)
Record envelope, standing records and threshold days for Cougar Mountain Washington (USR0000WCOU), Washington, United States, with 39 years of record.
Key Facts for Cougar Mountain Washington
- Cougar Mountain Washington (USR0000WCOU) is a weather station in Washington, United States at 47.92 latitude and -123.12 longitude, 914 m (3,000 ft) above sea level.
- The station reports from 1985 to 2023, 39 years of record.
- 1,464 records set at Cougar Mountain Washington still stand.
- Records are tracked for tmax, tmin: an element needs 30 years of data to be eligible.
- Cougar Mountain Washington tied a daily record high minimum temperature of 11.7 C (53.1 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: Washington, United States, 47.92 latitude, -123.12 longitude.
- Elevation: 914 m (3,000 ft).
- Period of record: 1985 to 2023, 39 years.
- Eligible elements: tmax, tmin.
Daily Record Envelope and 2026
7 days at or beyond a record| Month | Highest record high | Lowest record low | 2026 highest maximum | 2026 lowest minimum |
|---|---|---|---|---|
| Jan | 19.4 C (66.9 F) | -17.2 C (1.0 F) | 15.6 C (60.1 F) | -2.8 C (27.0 F) |
| Feb | 20.0 C (68.0 F) | -18.2 C (-0.8 F) | 18.3 C (64.9 F) | -6.7 C (19.9 F) |
| Mar | 21.7 C (71.1 F) | -11.2 C (11.8 F) | 13.9 C (57.0 F) | -5.0 C (23.0 F) |
| Apr | 26.1 C (79.0 F) | -6.1 C (21.0 F) | 21.7 C (71.1 F) | -1.7 C (28.9 F) |
| May | 29.8 C (85.6 F) | -4.5 C (23.9 F) | 24.4 C (75.9 F) | 0.6 C (33.1 F) |
| Jun | 38.7 C (101.7 F) | 0.0 C (32.0 F) | 28.9 C (84.0 F) | 2.8 C (37.0 F) |
| Jul | 35.6 C (96.1 F) | 2.8 C (37.0 F) | 30.6 C (87.1 F) | 7.8 C (46.0 F) |
| Aug | 32.8 C (91.0 F) | 3.3 C (37.9 F) | 27.8 C (82.0 F) | 7.8 C (46.0 F) |
| Sep | 33.6 C (92.5 F) | 0.0 C (32.0 F) | 23.9 C (75.0 F) | 2.8 C (37.0 F) |
| Oct | 32.3 C (90.1 F) | -5.0 C (23.0 F) | 21.1 C (70.0 F) | 2.8 C (37.0 F) |
| Nov | 21.7 C (71.1 F) | -15.5 C (4.1 F) | n/a | n/a |
| Dec | 16.1 C (61.0 F) | -17.4 C (0.7 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1985 | 86 |
| 1986 | 60 |
| 1987 | 60 |
| 1988 | 47 |
| 1989 | 41 |
| 1990 | 38 |
| 1991 | 33 |
| 1992 | 56 |
| 1993 | 42 |
| 1994 | 21 |
| 1995 | 21 |
| 1996 | 27 |
| 1997 | 7 |
| 1998 | 12 |
| 1999 | 19 |
| 2000 | 14 |
| 2001 | 11 |
| 2002 | 48 |
| 2003 | 25 |
| 2004 | 34 |
| 2005 | 25 |
| 2006 | 21 |
| 2007 | 30 |
| 2008 | 61 |
| 2009 | 45 |
| 2010 | 21 |
| 2011 | 19 |
| 2012 | 32 |
| 2013 | 34 |
| 2014 | 42 |
| 2015 | 35 |
| 2016 | 49 |
| 2017 | 41 |
| 2018 | 32 |
| 2019 | 33 |
| 2020 | 25 |
| 2021 | 37 |
| 2022 | 53 |
| 2023 | 38 |
| 2024 | 34 |
| 2025 | 38 |
| 2026 | 17 |
All-Time Record Progression
4 new records| Date | Kind | Detail |
|---|---|---|
| 2021-06-27 | Record high maximum temperature | Record high maximum temperature 38.1 C (100.6 F) |
| 2021-06-27 | Record high minimum temperature | Record high minimum temperature 23.9 C (75.0 F) |
| 2021-06-28 | Record high maximum temperature | Record high maximum temperature 38.7 C (101.7 F) |
| 2021-06-28 | Record high minimum temperature | Record high minimum temperature 26.7 C (80.1 F) |
Period of Record Coverage
1985 to 2026| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1985 | 320 | 88% | No |
| 1986 | 344 | 94% | Yes |
| 1987 | 351 | 96% | Yes |
| 1988 | 288 | 79% | No |
| 1989 | 332 | 91% | Yes |
| 1990 | 357 | 98% | Yes |
| 1991 | 320 | 88% | No |
| 1992 | 365 | 100% | Yes |
| 1993 | 357 | 98% | Yes |
| 1994 | 285 | 78% | No |
| 1995 | 218 | 60% | No |
| 1996 | 177 | 48% | No |
| 1997 | 196 | 54% | No |
| 1998 | 179 | 49% | No |
| 1999 | 176 | 48% | No |
| 2000 | 157 | 43% | No |
| 2001 | 187 | 51% | No |
| 2002 | 365 | 100% | Yes |
| 2003 | 364 | 100% | Yes |
| 2004 | 341 | 93% | Yes |
| 2005 | 272 | 75% | No |
| 2006 | 364 | 100% | Yes |
| 2007 | 365 | 100% | Yes |
| 2008 | 354 | 97% | Yes |
| 2009 | 364 | 100% | Yes |
| 2010 | 365 | 100% | Yes |
| 2011 | 365 | 100% | Yes |
| 2012 | 365 | 100% | Yes |
| 2013 | 365 | 100% | Yes |
| 2014 | 361 | 99% | Yes |
| 2015 | 365 | 100% | Yes |
| 2016 | 362 | 99% | Yes |
| 2017 | 364 | 100% | Yes |
| 2018 | 364 | 100% | Yes |
| 2019 | 365 | 100% | Yes |
| 2020 | 366 | 100% | Yes |
| 2021 | 365 | 100% | Yes |
| 2022 | 364 | 100% | Yes |
| 2023 | 365 | 100% | Yes |
| 2024 | 365 | 100% | Yes |
| 2025 | 365 | 100% | Yes |
| 2026 | 284 | 78% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 5 October 2026 | Cougar Mountain Washington, US | daily high min (Tie, Provisional) | 11.7 C (53.1 F) | tie | 12 years | 1 of 100 (Routine) |
| 25 September 2026 | Cougar Mountain Washington, US | daily low min (Provisional) | 2.8 C (37.0 F) | 0.5 C (0.9 F) | 27 years | 13 of 100 (Routine) |
| 23 September 2026 | Cougar Mountain Washington, US | daily low max (Provisional) | 10.0 C (50.0 F) | 0.6 C (1.1 F) | 12 years | 8 of 100 (Routine) |
| 28 August 2026 | Cougar Mountain Washington, US | daily low max (Provisional) | 12.8 C (55.0 F) | 1.5 C (2.7 F) | 40 years | 19 of 100 (Routine) |
| 21 July 2026 | Cougar Mountain Washington, US | daily high min (Tie) | 18.3 C (64.9 F) | tie | 32 years | 3 of 100 (Routine) |
| 15 June 2026 | Cougar Mountain Washington, US | daily high max | 28.9 C (84.0 F) | 4.5 C (8.1 F) | 11 years | 15 of 100 (Routine) |
| 15 June 2026 | Cougar Mountain Washington, US | daily high min | 15.0 C (59.0 F) | 1.7 C (3.1 F) | 11 years | 11 of 100 (Routine) |
| 14 June 2026 | Cougar Mountain Washington, US | daily high min | 15.0 C (59.0 F) | 2.7 C (4.9 F) | 37 years | 22 of 100 (Routine) |
| 14 June 2026 | Cougar Mountain Washington, US | daily high max | 28.3 C (82.9 F) | 1.1 C (2.0 F) | 27 years | 14 of 100 (Routine) |
| 12 May 2026 | Cougar Mountain Washington, US | daily high min | 10.0 C (50.0 F) | 0.5 C (0.9 F) | 3 years | 5 of 100 (Routine) |
| 5 May 2026 | Cougar Mountain Washington, US | daily high min (Tie) | 12.2 C (54.0 F) | tie | 33 years | 3 of 100 (Routine) |
| 4 May 2026 | Cougar Mountain Washington, US | daily high max (Tie) | 24.4 C (75.9 F) | tie | 33 years | 3 of 100 (Routine) |
| 4 May 2026 | Cougar Mountain Washington, US | daily high min (Tie) | 13.3 C (55.9 F) | tie | 33 years | 3 of 100 (Routine) |
| 3 May 2026 | Cougar Mountain Washington, US | daily high max | 24.4 C (75.9 F) | 3.3 C (5.9 F) | 33 years | 20 of 100 (Routine) |
| 3 May 2026 | Cougar Mountain Washington, US | daily high min | 12.2 C (54.0 F) | 2.2 C (4.0 F) | 3 years | 10 of 100 (Routine) |
| 10 April 2026 | Cougar Mountain Washington, US | daily high min (Tie) | 7.2 C (45.0 F) | tie | 21 years | 2 of 100 (Routine) |
| 29 March 2026 | Cougar Mountain Washington, US | daily low max | 1.1 C (34.0 F) | 1.8 C (3.2 F) | 40 years | 20 of 100 (Routine) |
| 18 March 2026 | Cougar Mountain Washington, US | daily high min | 7.8 C (46.0 F) | 0.6 C (1.1 F) | 7 years | 8 of 100 (Routine) |
| 7 March 2026 | Cougar Mountain Washington, US | daily high min | 5.6 C (42.1 F) | 1.2 C (2.2 F) | 11 years | 11 of 100 (Routine) |
| 6 February 2026 | Cougar Mountain Washington, US | daily high min | 7.2 C (45.0 F) | 0.8 C (1.4 F) | 39 years | 17 of 100 (Routine) |
Climate Trend
26 complete years, 1986 to 2025| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1986 | 7.2 C | -1.13 C |
| 1987 | 8.0 C | -0.30 C |
| 1990 | 6.9 C | -1.40 C |
| 1992 | 8.8 C | +0.47 C |
| 1993 | 7.5 C | -0.75 C |
| 2002 | 8.4 C | +0.11 C |
| 2003 | 8.9 C | +0.64 C |
| 2006 | 8.3 C | -0.02 C |
| 2007 | 7.6 C | -0.70 C |
| 2009 | 8.3 C | -0.02 C |
| 2010 | 8.1 C | -0.23 C |
| 2011 | 7.0 C | -1.26 C |
| 2012 | 7.8 C | -0.51 C |
| 2013 | 8.5 C | +0.20 C |
| 2014 | 9.2 C | +0.86 C |
| 2015 | 9.9 C | +1.57 C |
| 2016 | 8.9 C | +0.62 C |
| 2017 | 8.3 C | -0.03 C |
| 2018 | 8.7 C | +0.36 C |
| 2019 | 8.1 C | -0.19 C |
| 2020 | 8.4 C | +0.14 C |
| 2021 | 8.3 C | +0.04 C |
| 2022 | 8.5 C | +0.19 C |
| 2023 | 8.8 C | +0.47 C |
| 2024 | 8.6 C | +0.28 C |
| 2025 | 8.9 C | +0.65 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
1985 to 2026| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 38.7 C (101.7 F) | 2021 | 31.1 C (88.0 F) | 42 |
| Coldest night (TNn) | -18.2 C (-0.8 F) | 1989 | -10.0 C (14.0 F) | 42 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1985 | 28.1 C (82.6 F) |
| 1986 | 30.0 C (86.0 F) |
| 1987 | 32.3 C (90.1 F) |
| 1988 | 33.6 C (92.5 F) |
| 1989 | 26.9 C (80.4 F) |
| 1990 | 28.8 C (83.8 F) |
| 1991 | 30.6 C (87.1 F) |
| 1992 | 30.0 C (86.0 F) |
| 1993 | 30.0 C (86.0 F) |
| 1994 | 31.1 C (88.0 F) |
| 1995 | 30.6 C (87.1 F) |
| 1996 | 31.1 C (88.0 F) |
| 1997 | 30.6 C (87.1 F) |
| 1998 | 35.6 C (96.1 F) |
| 1999 | 28.3 C (82.9 F) |
| 2000 | 31.1 C (88.0 F) |
| 2001 | 30.0 C (86.0 F) |
| 2002 | 32.2 C (90.0 F) |
| 2003 | 31.7 C (89.1 F) |
| 2004 | 32.2 C (90.0 F) |
| 2005 | 29.4 C (84.9 F) |
| 2006 | 32.8 C (91.0 F) |
| 2007 | 32.8 C (91.0 F) |
| 2008 | 31.7 C (89.1 F) |
| 2009 | 35.0 C (95.0 F) |
| 2010 | 32.2 C (90.0 F) |
| 2011 | 31.1 C (88.0 F) |
| 2012 | 31.1 C (88.0 F) |
| 2013 | 31.1 C (88.0 F) |
| 2014 | 31.1 C (88.0 F) |
| 2015 | 31.7 C (89.1 F) |
| 2016 | 30.0 C (86.0 F) |
| 2017 | 31.1 C (88.0 F) |
| 2018 | 31.1 C (88.0 F) |
| 2019 | 28.3 C (82.9 F) |
| 2020 | 30.6 C (87.1 F) |
| 2021 | 38.7 C (101.7 F) |
| 2022 | 32.4 C (90.3 F) |
| 2023 | 32.2 C (90.0 F) |
| 2024 | 31.7 C (89.1 F) |
| 2025 | 31.7 C (89.1 F) |
| 2026 | 30.6 C (87.1 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1985 | -15.5 C (4.1 F) |
| 1986 | -11.9 C (10.6 F) |
| 1987 | -9.2 C (15.4 F) |
| 1988 | -10.0 C (14.0 F) |
| 1989 | -18.2 C (-0.8 F) |
| 1990 | -17.4 C (0.7 F) |
| 1991 | -9.6 C (14.7 F) |
| 1992 | -7.8 C (18.0 F) |
| 1993 | -12.8 C (9.0 F) |
| 1994 | -8.3 C (17.1 F) |
| 1995 | -5.6 C (21.9 F) |
| 1996 | -1.7 C (28.9 F) |
| 1997 | -1.1 C (30.0 F) |
| 1998 | -0.6 C (30.9 F) |
| 1999 | -2.2 C (28.0 F) |
| 2000 | -5.0 C (23.0 F) |
| 2001 | -3.9 C (25.0 F) |
| 2002 | -8.9 C (16.0 F) |
| 2003 | -6.7 C (19.9 F) |
| 2004 | -15.0 C (5.0 F) |
| 2005 | -4.4 C (24.1 F) |
| 2006 | -12.8 C (9.0 F) |
| 2007 | -10.6 C (12.9 F) |
| 2008 | -8.3 C (17.1 F) |
| 2009 | -10.6 C (12.9 F) |
| 2010 | -13.3 C (8.1 F) |
| 2011 | -11.7 C (10.9 F) |
| 2012 | -8.3 C (17.1 F) |
| 2013 | -12.8 C (9.0 F) |
| 2014 | -11.7 C (10.9 F) |
| 2015 | -6.7 C (19.9 F) |
| 2016 | -8.9 C (16.0 F) |
| 2017 | -11.1 C (12.0 F) |
| 2018 | -10.0 C (14.0 F) |
| 2019 | -10.0 C (14.0 F) |
| 2020 | -8.5 C (16.7 F) |
| 2021 | -14.3 C (6.3 F) |
| 2022 | -13.8 C (7.2 F) |
| 2023 | -10.2 C (13.6 F) |
| 2024 | -17.2 C (1.0 F) |
| 2025 | -10.6 C (12.9 F) |
| 2026 | -6.7 C (19.9 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
26 years with a frostAcross 26 years with a frost, the median last spring frost at Cougar Mountain Washington falls on 6 May and the median first autumn frost on 26 October, which leaves a median of 171 days between them.
Fitted over all years, the growing season changes by +3.2 days per decade at this station.
| Measure | Median, all years | Earliest period | Recent period (1986 to 2025) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 6 May | n/a | 6 May | n/a | -3.6 days per decade |
| First autumn frost | 26 October | n/a | 26 October | n/a | -0.4 days per decade |
| Growing days | 171 days | n/a | 171 days | n/a | +3.2 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
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 2026-10-14 (14 October 2026). Records are computed by this site and are not official.
Data as of . Last revised (2026-10-14).