Walla Walla Rgnl AP Weather Records (USW00024160)
Record envelope, standing records and threshold days for Walla Walla Rgnl AP (USW00024160), Washington, United States, with 78 years of record.
Key Facts for Walla Walla Rgnl AP
- Walla Walla Rgnl AP (USW00024160) is a weather station in Washington, United States at 46.09 latitude and -118.29 longitude, 357 m (1,170 ft) above sea level.
- The station reports from 1949 to 2026, 78 years of record.
- 1,464 records set at Walla Walla Rgnl AP still stand.
- Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
- Walla Walla Rgnl AP set a daily record low maximum temperature of 18.9 C (66.0 F) on 3 September 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, 46.09 latitude, -118.29 longitude.
- Elevation: 357 m (1,170 ft).
- Period of record: 1949 to 2026, 78 years.
- Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
4 days at or beyond a record| Month | Highest record high | Lowest record low | 2026 highest maximum | 2026 lowest minimum |
|---|---|---|---|---|
| Jan | 21.1 C (70.0 F) | -27.8 C (-18.0 F) | 19.4 C (66.9 F) | -7.2 C (19.0 F) |
| Feb | 23.9 C (75.0 F) | -26.7 C (-16.1 F) | 18.3 C (64.9 F) | -3.9 C (25.0 F) |
| Mar | 26.1 C (79.0 F) | -15.6 C (3.9 F) | 24.4 C (75.9 F) | -0.6 C (30.9 F) |
| Apr | 35.6 C (96.1 F) | -6.7 C (19.9 F) | 24.4 C (75.9 F) | 0.6 C (33.1 F) |
| May | 37.8 C (100.0 F) | -3.3 C (26.1 F) | 30.0 C (86.0 F) | 5.6 C (42.1 F) |
| Jun | 46.7 C (116.1 F) | 2.2 C (36.0 F) | 33.9 C (93.0 F) | 7.8 C (46.0 F) |
| Jul | 45.6 C (114.1 F) | 4.4 C (39.9 F) | 38.9 C (102.0 F) | 11.1 C (52.0 F) |
| Aug | 45.6 C (114.1 F) | 5.6 C (42.1 F) | 36.7 C (98.1 F) | 10.6 C (51.1 F) |
| Sep | 40.0 C (104.0 F) | 0.0 C (32.0 F) | 30.6 C (87.1 F) | 6.1 C (43.0 F) |
| Oct | 31.7 C (89.1 F) | -9.4 C (15.1 F) | 28.9 C (84.0 F) | 1.7 C (35.1 F) |
| Nov | 27.2 C (81.0 F) | -23.9 C (-11.0 F) | n/a | n/a |
| Dec | 21.7 C (71.1 F) | -31.1 C (-24.0 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1949 | 26 |
| 1950 | 39 |
| 1951 | 10 |
| 1952 | 18 |
| 1953 | 18 |
| 1954 | 26 |
| 1955 | 42 |
| 1956 | 24 |
| 1957 | 27 |
| 1958 | 17 |
| 1959 | 19 |
| 1960 | 28 |
| 1961 | 17 |
| 1962 | 20 |
| 1963 | 18 |
| 1964 | 19 |
| 1965 | 21 |
| 1966 | 17 |
| 1967 | 27 |
| 1968 | 25 |
| 1969 | 14 |
| 1970 | 19 |
| 1971 | 25 |
| 1972 | 44 |
| 1973 | 15 |
| 1974 | 33 |
| 1975 | 15 |
| 1976 | 13 |
| 1977 | 21 |
| 1978 | 11 |
| 1979 | 15 |
| 1980 | 17 |
| 1981 | 17 |
| 1982 | 14 |
| 1983 | 31 |
| 1984 | 15 |
| 1985 | 53 |
| 1986 | 18 |
| 1987 | 26 |
| 1988 | 13 |
| 1989 | 26 |
| 1990 | 15 |
| 1991 | 13 |
| 1992 | 28 |
| 1993 | 18 |
| 1994 | 25 |
| 1995 | 4 |
| 1998 | 2 |
| 1999 | 22 |
| 2000 | 8 |
| 2001 | 12 |
| 2002 | 31 |
| 2003 | 25 |
| 2004 | 13 |
| 2005 | 4 |
| 2006 | 14 |
| 2007 | 12 |
| 2008 | 17 |
| 2009 | 12 |
| 2010 | 12 |
| 2011 | 11 |
| 2012 | 13 |
| 2013 | 16 |
| 2014 | 21 |
| 2015 | 30 |
| 2016 | 12 |
| 2017 | 6 |
| 2018 | 14 |
| 2019 | 26 |
| 2020 | 24 |
| 2021 | 21 |
| 2022 | 19 |
| 2023 | 14 |
| 2024 | 7 |
| 2025 | 27 |
| 2026 | 3 |
All-Time Record Progression
5 new records| Date | Kind | Detail |
|---|---|---|
| 1980-01-08 | Record daily snowfall | Record daily snowfall 21.1 cm (8.3 in) |
| 1985-11-19 | Record daily snowfall | Record daily snowfall 22.9 cm (9.0 in) |
| 1992-07-23 | Record daily precipitation | Record daily precipitation 92.5 mm (3.6 in) |
| 1994-02-24 | Record daily snowfall | Record daily snowfall 27.9 cm (11.0 in) |
| 2021-06-29 | Record high maximum temperature | Record high maximum temperature 46.7 C (116.1 F) |
Wettest Day of Each Month
Jul: 92.5 mm (3.6 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 33.3 mm (1.3 in) | 1 January 1994 |
| Feb | 40.9 mm (1.6 in) | 23 February 2002 |
| Mar | 34.5 mm (1.4 in) | 4 March 1983 |
| Apr | 41.1 mm (1.6 in) | 27 April 1990 |
| May | 43.2 mm (1.7 in) | 26 May 1971 |
| Jun | 38.1 mm (1.5 in) | 7 June 1950 |
| Jul | 92.5 mm (3.6 in) | 23 July 1992 |
| Aug | 58.2 mm (2.3 in) | 22 August 1992 |
| Sep | 42.9 mm (1.7 in) | 8 September 2003 |
| Oct | 39.6 mm (1.6 in) | 31 October 1994 |
| Nov | 38.1 mm (1.5 in) | 4 November 1994 |
| Dec | 35.3 mm (1.4 in) | 5 December 1971 |
Period of Record Coverage
1949 to 2026| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1949 | 361 | 99% | Yes |
| 1950 | 365 | 100% | Yes |
| 1951 | 365 | 100% | Yes |
| 1952 | 366 | 100% | Yes |
| 1953 | 365 | 100% | Yes |
| 1954 | 365 | 100% | Yes |
| 1955 | 365 | 100% | Yes |
| 1956 | 366 | 100% | Yes |
| 1957 | 364 | 100% | Yes |
| 1958 | 364 | 100% | Yes |
| 1959 | 365 | 100% | Yes |
| 1960 | 366 | 100% | Yes |
| 1961 | 365 | 100% | Yes |
| 1962 | 365 | 100% | Yes |
| 1963 | 365 | 100% | Yes |
| 1964 | 366 | 100% | Yes |
| 1965 | 365 | 100% | Yes |
| 1966 | 365 | 100% | Yes |
| 1967 | 365 | 100% | Yes |
| 1968 | 366 | 100% | Yes |
| 1969 | 365 | 100% | Yes |
| 1970 | 365 | 100% | Yes |
| 1971 | 365 | 100% | Yes |
| 1972 | 366 | 100% | Yes |
| 1973 | 365 | 100% | Yes |
| 1974 | 365 | 100% | Yes |
| 1975 | 365 | 100% | Yes |
| 1976 | 366 | 100% | Yes |
| 1977 | 365 | 100% | Yes |
| 1978 | 365 | 100% | Yes |
| 1979 | 365 | 100% | Yes |
| 1980 | 366 | 100% | Yes |
| 1981 | 365 | 100% | Yes |
| 1982 | 365 | 100% | Yes |
| 1983 | 365 | 100% | Yes |
| 1984 | 366 | 100% | Yes |
| 1985 | 365 | 100% | Yes |
| 1986 | 365 | 100% | Yes |
| 1987 | 364 | 100% | Yes |
| 1988 | 366 | 100% | Yes |
| 1989 | 365 | 100% | Yes |
| 1990 | 365 | 100% | Yes |
| 1991 | 365 | 100% | Yes |
| 1992 | 366 | 100% | Yes |
| 1993 | 364 | 100% | Yes |
| 1994 | 365 | 100% | Yes |
| 1995 | 53 | 15% | No |
| 1998 | 71 | 19% | No |
| 1999 | 365 | 100% | Yes |
| 2000 | 365 | 100% | Yes |
| 2001 | 364 | 100% | Yes |
| 2002 | 363 | 99% | Yes |
| 2003 | 362 | 99% | Yes |
| 2004 | 365 | 100% | Yes |
| 2005 | 365 | 100% | Yes |
| 2006 | 365 | 100% | Yes |
| 2007 | 365 | 100% | Yes |
| 2008 | 364 | 99% | Yes |
| 2009 | 365 | 100% | Yes |
| 2010 | 365 | 100% | Yes |
| 2011 | 361 | 99% | Yes |
| 2012 | 365 | 100% | Yes |
| 2013 | 364 | 100% | Yes |
| 2014 | 365 | 100% | Yes |
| 2015 | 365 | 100% | Yes |
| 2016 | 366 | 100% | Yes |
| 2017 | 363 | 99% | Yes |
| 2018 | 365 | 100% | Yes |
| 2019 | 365 | 100% | Yes |
| 2020 | 366 | 100% | Yes |
| 2021 | 365 | 100% | Yes |
| 2022 | 365 | 100% | Yes |
| 2023 | 365 | 100% | Yes |
| 2024 | 364 | 99% | Yes |
| 2025 | 365 | 100% | Yes |
| 2026 | 279 | 76% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 3 September 2026 | Walla Walla Rgnl AP, US | daily low max (Provisional) | 18.9 C (66.0 F) | 1.1 C (2.0 F) | 47 years | 23 of 100 (Routine) |
| 5 May 2026 | Walla Walla Rgnl AP, US | daily high min (Tie) | 15.0 C (59.0 F) | tie | 60 years | 6 of 100 (Routine) |
| 25 April 2026 | Walla Walla Rgnl AP, US | daily low min (Tie) | 0.6 C (33.1 F) | tie | 71 years | 7 of 100 (Routine) |
| 22 April 2026 | Walla Walla Rgnl AP, US | daily rain | 30.0 mm (1.2 in) | 16.8 mm (0.7 in) | 68 years | 59 of 100 (Notable) |
| 19 March 2026 | Walla Walla Rgnl AP, US | daily high min | 13.3 C (55.9 F) | 4.4 C (7.9 F) | 76 years | 42 of 100 (Notable) |
| 19 March 2026 | Walla Walla Rgnl AP, US | daily high max | 24.4 C (75.9 F) | 0.5 C (0.9 F) | 1 year | 8 of 100 (Routine) |
| 7 March 2026 | Walla Walla Rgnl AP, US | daily high min (Tie) | 9.4 C (48.9 F) | tie | 21 years | 3 of 100 (Routine) |
| 22 February 2026 | Walla Walla Rgnl AP, US | daily high max (Tie) | 18.3 C (64.9 F) | tie | 43 years | 4 of 100 (Routine) |
| 8 February 2026 | Walla Walla Rgnl AP, US | daily rain | 27.2 mm (1.1 in) | 19.1 mm (0.8 in) | 66 years | 66 of 100 (Major) |
| 12 January 2026 | Walla Walla Rgnl AP, US | daily high max | 19.4 C (66.9 F) | 1.6 C (2.9 F) | 67 years | 29 of 100 (Routine) |
| 24 December 2025 | Walla Walla Rgnl AP, US | daily high max | 17.8 C (64.0 F) | 2.8 C (5.0 F) | 75 years | 33 of 100 (Routine) |
| 19 December 2025 | Walla Walla Rgnl AP, US | daily high max (Tie) | 15.0 C (59.0 F) | tie | 31 years | 4 of 100 (Routine) |
| 17 December 2025 | Walla Walla Rgnl AP, US | daily high max | 19.4 C (66.9 F) | 2.7 C (4.9 F) | 31 years | 20 of 100 (Routine) |
| 16 December 2025 | Walla Walla Rgnl AP, US | daily high max | 17.8 C (64.0 F) | 1.1 C (2.0 F) | 52 years | 23 of 100 (Routine) |
| 16 December 2025 | Walla Walla Rgnl AP, US | daily high min (Tie) | 10.0 C (50.0 F) | tie | 52 years | 5 of 100 (Routine) |
| 15 December 2025 | Walla Walla Rgnl AP, US | daily high max | 20.0 C (68.0 F) | 2.8 C (5.0 F) | 66 years | 30 of 100 (Routine) |
| 13 December 2025 | Walla Walla Rgnl AP, US | daily high max | 17.2 C (63.0 F) | 0.5 C (0.9 F) | 56 years | 23 of 100 (Routine) |
| 12 December 2025 | Walla Walla Rgnl AP, US | daily high max (Tie) | 16.7 C (62.1 F) | tie | 15 years | 2 of 100 (Routine) |
| 11 December 2025 | Walla Walla Rgnl AP, US | daily high min | 12.2 C (54.0 F) | 2.2 C (4.0 F) | 11 years | 14 of 100 (Routine) |
| 9 December 2025 | Walla Walla Rgnl AP, US | daily high min | 8.3 C (46.9 F) | 1.6 C (2.9 F) | 15 years | 14 of 100 (Routine) |
Climate Trend
73 complete years, 1949 to 2025| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1949 | 11.5 C | -0.64 C |
| 1950 | 10.8 C | -1.32 C |
| 1951 | 11.3 C | -0.76 C |
| 1952 | 11.9 C | -0.20 C |
| 1953 | 12.6 C | +0.48 C |
| 1954 | 11.0 C | -1.09 C |
| 1955 | 10.2 C | -1.87 C |
| 1956 | 11.1 C | -0.98 C |
| 1957 | 11.1 C | -1.05 C |
| 1958 | 13.2 C | +1.08 C |
| 1959 | 11.3 C | -0.82 C |
| 1960 | 11.3 C | -0.80 C |
| 1961 | 12.4 C | +0.31 C |
| 1962 | 11.6 C | -0.49 C |
| 1963 | 11.9 C | -0.21 C |
| 1964 | 11.4 C | -0.73 C |
| 1965 | 12.8 C | +0.73 C |
| 1966 | 12.5 C | +0.42 C |
| 1967 | 13.1 C | +1.04 C |
| 1968 | 12.2 C | +0.07 C |
| 1969 | 11.5 C | -0.58 C |
| 1970 | 12.0 C | -0.12 C |
| 1971 | 11.7 C | -0.45 C |
| 1972 | 11.4 C | -0.70 C |
| 1973 | 12.6 C | +0.48 C |
| 1974 | 12.8 C | +0.67 C |
| 1975 | 12.3 C | +0.18 C |
| 1976 | 11.8 C | -0.26 C |
| 1977 | 12.3 C | +0.18 C |
| 1978 | 11.2 C | -0.89 C |
| 1979 | 12.3 C | +0.16 C |
| 1980 | 11.6 C | -0.46 C |
| 1981 | 12.9 C | +0.84 C |
| 1982 | 12.3 C | +0.17 C |
| 1983 | 12.5 C | +0.40 C |
| 1984 | 12.1 C | -0.05 C |
| 1985 | 10.4 C | -1.67 C |
| 1986 | 12.1 C | +0.03 C |
| 1987 | 12.5 C | +0.42 C |
| 1988 | 12.4 C | +0.31 C |
| 1989 | 11.2 C | -0.91 C |
| 1990 | 12.6 C | +0.51 C |
| 1991 | 11.9 C | -0.22 C |
| 1992 | 13.1 C | +0.99 C |
| 1993 | 10.5 C | -1.61 C |
| 1994 | 13.7 C | +1.58 C |
| 1999 | 12.4 C | +0.27 C |
| 2000 | 11.5 C | -0.62 C |
| 2001 | 11.8 C | -0.27 C |
| 2002 | 11.9 C | -0.20 C |
| 2003 | 12.9 C | +0.84 C |
| 2004 | 12.6 C | +0.47 C |
| 2005 | 12.2 C | +0.13 C |
| 2006 | 12.6 C | +0.53 C |
| 2007 | 12.5 C | +0.40 C |
| 2008 | 11.7 C | -0.41 C |
| 2009 | 12.1 C | -0.03 C |
| 2010 | 12.3 C | +0.23 C |
| 2011 | 11.8 C | -0.26 C |
| 2012 | 12.5 C | +0.39 C |
| 2013 | 12.5 C | +0.37 C |
| 2014 | 13.0 C | +0.94 C |
| 2015 | 14.1 C | +1.96 C |
| 2016 | 12.8 C | +0.74 C |
| 2017 | 12.2 C | +0.08 C |
| 2018 | 13.2 C | +1.08 C |
| 2019 | 11.3 C | -0.76 C |
| 2020 | 12.4 C | +0.32 C |
| 2021 | 12.9 C | +0.76 C |
| 2022 | 11.4 C | -0.71 C |
| 2023 | 12.3 C | +0.17 C |
| 2024 | 12.5 C | +0.37 C |
| 2025 | 13.2 C | +1.14 C |
The annual mean temperature here has risen by 0.1 C (0.1 to 0.2) per decade over 1949 to 2025. In Fahrenheit: 0.2 F (0.1 to 0.4) per decade. The slope is a straight line fitted to 73 complete years; the brackets give its 95 percent interval.
| Measure | Per decade (C) | Per decade (F) | Period | Complete years | Reading |
|---|---|---|---|---|---|
| Annual mean temperature | 0.1 C (0.1 to 0.2) per decade | 0.2 F (0.1 to 0.4) per decade | 1949 to 2025 | 73 | Rise |
| Mean daily maximum | 0.09 C (0.01 to 0.17) per decade | 0.16 F (0.01 to 0.30) per decade | 1949 to 2025 | 73 | Rise |
| Mean daily minimum | 0.2 C (0.1 to 0.2) per decade | 0.3 F (0.2 to 0.4) per decade | 1949 to 2025 | 73 | Rise |
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
1949 to 2026| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 46.7 C (116.1 F) | 2021 | 40.6 C (105.1 F) | 76 |
| Coldest night (TNn) | -31.1 C (-24.0 F) | 1968 | -15.5 C (4.0 F) | 76 |
| Wettest day (Rx1day) | 92.5 mm (3.6 in) | 1992 | 27.6 mm (1.1 in) | 76 |
| Wettest five days (Rx5day) | 117.6 mm (4.6 in) | 1992 | 45.5 mm (1.8 in) | 76 |
| Longest dry spell (CDD) | 109 days | 1974 | 49 days | 76 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1949 | 40.0 C (104.0 F) |
| 1950 | 40.0 C (104.0 F) |
| 1951 | 38.9 C (102.0 F) |
| 1952 | 39.4 C (102.9 F) |
| 1953 | 39.4 C (102.9 F) |
| 1954 | 37.2 C (99.0 F) |
| 1955 | 40.0 C (104.0 F) |
| 1956 | 39.4 C (102.9 F) |
| 1957 | 36.7 C (98.1 F) |
| 1958 | 40.6 C (105.1 F) |
| 1959 | 41.1 C (106.0 F) |
| 1960 | 42.8 C (109.0 F) |
| 1961 | 45.6 C (114.1 F) |
| 1962 | 40.0 C (104.0 F) |
| 1963 | 37.2 C (99.0 F) |
| 1964 | 40.0 C (104.0 F) |
| 1965 | 41.7 C (107.1 F) |
| 1966 | 36.7 C (98.1 F) |
| 1967 | 41.1 C (106.0 F) |
| 1968 | 41.1 C (106.0 F) |
| 1969 | 37.8 C (100.0 F) |
| 1970 | 41.7 C (107.1 F) |
| 1971 | 43.9 C (111.0 F) |
| 1972 | 42.2 C (108.0 F) |
| 1973 | 40.6 C (105.1 F) |
| 1974 | 41.7 C (107.1 F) |
| 1975 | 45.6 C (114.1 F) |
| 1976 | 38.9 C (102.0 F) |
| 1977 | 43.3 C (109.9 F) |
| 1978 | 41.1 C (106.0 F) |
| 1979 | 42.8 C (109.0 F) |
| 1980 | 38.3 C (100.9 F) |
| 1981 | 41.7 C (107.1 F) |
| 1982 | 41.7 C (107.1 F) |
| 1983 | 39.4 C (102.9 F) |
| 1984 | 42.8 C (109.0 F) |
| 1985 | 42.8 C (109.0 F) |
| 1986 | 41.7 C (107.1 F) |
| 1987 | 40.0 C (104.0 F) |
| 1988 | 40.0 C (104.0 F) |
| 1989 | 39.4 C (102.9 F) |
| 1990 | 42.8 C (109.0 F) |
| 1991 | 38.9 C (102.0 F) |
| 1992 | 41.7 C (107.1 F) |
| 1993 | 37.8 C (100.0 F) |
| 1994 | 44.4 C (111.9 F) |
| 1995 | 23.9 C (75.0 F) |
| 1998 | 20.6 C (69.1 F) |
| 1999 | 38.9 C (102.0 F) |
| 2000 | 41.1 C (106.0 F) |
| 2001 | 39.4 C (102.9 F) |
| 2002 | 43.3 C (109.9 F) |
| 2003 | 40.0 C (104.0 F) |
| 2004 | 40.6 C (105.1 F) |
| 2005 | 41.7 C (107.1 F) |
| 2006 | 42.2 C (108.0 F) |
| 2007 | 43.3 C (109.9 F) |
| 2008 | 42.2 C (108.0 F) |
| 2009 | 42.2 C (108.0 F) |
| 2010 | 38.3 C (100.9 F) |
| 2011 | 37.2 C (99.0 F) |
| 2012 | 40.0 C (104.0 F) |
| 2013 | 41.1 C (106.0 F) |
| 2014 | 41.7 C (107.1 F) |
| 2015 | 45.0 C (113.0 F) |
| 2016 | 38.9 C (102.0 F) |
| 2017 | 39.4 C (102.9 F) |
| 2018 | 42.2 C (108.0 F) |
| 2019 | 40.0 C (104.0 F) |
| 2020 | 42.2 C (108.0 F) |
| 2021 | 46.7 C (116.1 F) |
| 2022 | 42.2 C (108.0 F) |
| 2023 | 39.4 C (102.9 F) |
| 2024 | 41.1 C (106.0 F) |
| 2025 | 38.3 C (100.9 F) |
| 2026 | 38.9 C (102.0 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1949 | -20.6 C (-5.1 F) |
| 1950 | -26.7 C (-16.1 F) |
| 1951 | -17.2 C (1.0 F) |
| 1952 | -13.9 C (7.0 F) |
| 1953 | -4.4 C (24.1 F) |
| 1954 | -21.7 C (-7.1 F) |
| 1955 | -20.0 C (-4.0 F) |
| 1956 | -22.8 C (-9.0 F) |
| 1957 | -27.8 C (-18.0 F) |
| 1958 | -9.4 C (15.1 F) |
| 1959 | -18.9 C (-2.0 F) |
| 1960 | -13.9 C (7.0 F) |
| 1961 | -17.2 C (1.0 F) |
| 1962 | -20.0 C (-4.0 F) |
| 1963 | -19.4 C (-2.9 F) |
| 1964 | -21.7 C (-7.1 F) |
| 1965 | -8.9 C (16.0 F) |
| 1966 | -6.7 C (19.9 F) |
| 1967 | -15.0 C (5.0 F) |
| 1968 | -31.1 C (-24.0 F) |
| 1969 | -20.6 C (-5.1 F) |
| 1970 | -11.1 C (12.0 F) |
| 1971 | -10.6 C (12.9 F) |
| 1972 | -22.8 C (-9.0 F) |
| 1973 | -21.7 C (-7.1 F) |
| 1974 | -23.3 C (-9.9 F) |
| 1975 | -11.7 C (10.9 F) |
| 1976 | -11.7 C (10.9 F) |
| 1977 | -18.9 C (-2.0 F) |
| 1978 | -21.1 C (-6.0 F) |
| 1979 | -21.7 C (-7.1 F) |
| 1980 | -15.6 C (3.9 F) |
| 1981 | -9.4 C (15.1 F) |
| 1982 | -18.3 C (-0.9 F) |
| 1983 | -26.1 C (-15.0 F) |
| 1984 | -17.2 C (1.0 F) |
| 1985 | -23.9 C (-11.0 F) |
| 1986 | -9.4 C (15.1 F) |
| 1987 | -15.0 C (5.0 F) |
| 1988 | -13.3 C (8.1 F) |
| 1989 | -25.0 C (-13.0 F) |
| 1990 | -25.6 C (-14.1 F) |
| 1991 | -9.4 C (15.1 F) |
| 1992 | -9.4 C (15.1 F) |
| 1993 | -20.0 C (-4.0 F) |
| 1994 | -12.8 C (9.0 F) |
| 1995 | -13.9 C (7.0 F) |
| 1998 | -15.6 C (3.9 F) |
| 1999 | -4.4 C (24.1 F) |
| 2000 | -8.3 C (17.1 F) |
| 2001 | -5.0 C (23.0 F) |
| 2002 | -9.4 C (15.1 F) |
| 2003 | -12.2 C (10.0 F) |
| 2004 | -24.4 C (-11.9 F) |
| 2005 | -11.7 C (10.9 F) |
| 2006 | -11.6 C (11.1 F) |
| 2007 | -13.2 C (8.2 F) |
| 2008 | -19.3 C (-2.7 F) |
| 2009 | -14.9 C (5.2 F) |
| 2010 | -18.8 C (-1.8 F) |
| 2011 | -12.1 C (10.2 F) |
| 2012 | -7.7 C (18.1 F) |
| 2013 | -16.0 C (3.2 F) |
| 2014 | -15.5 C (4.1 F) |
| 2015 | -10.5 C (13.1 F) |
| 2016 | -17.1 C (1.2 F) |
| 2017 | -21.0 C (-5.8 F) |
| 2018 | -7.1 C (19.2 F) |
| 2019 | -13.8 C (7.2 F) |
| 2020 | -9.9 C (14.2 F) |
| 2021 | -17.7 C (0.1 F) |
| 2022 | -19.3 C (-2.7 F) |
| 2023 | -13.8 C (7.2 F) |
| 2024 | -25.5 C (-13.9 F) |
| 2025 | -14.9 C (5.2 F) |
| 2026 | -7.2 C (19.0 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1949 | 28.4 mm (1.1 in) |
| 1950 | 38.1 mm (1.5 in) |
| 1951 | 27.9 mm (1.1 in) |
| 1952 | 26.2 mm (1.0 in) |
| 1953 | 23.4 mm (0.9 in) |
| 1954 | 25.9 mm (1.0 in) |
| 1955 | 27.7 mm (1.1 in) |
| 1956 | 31.0 mm (1.2 in) |
| 1957 | 31.8 mm (1.3 in) |
| 1958 | 30.7 mm (1.2 in) |
| 1959 | 26.4 mm (1.0 in) |
| 1960 | 23.4 mm (0.9 in) |
| 1961 | 24.4 mm (1.0 in) |
| 1962 | 34.0 mm (1.3 in) |
| 1963 | 20.8 mm (0.8 in) |
| 1964 | 27.7 mm (1.1 in) |
| 1965 | 35.3 mm (1.4 in) |
| 1966 | 22.9 mm (0.9 in) |
| 1967 | 23.9 mm (0.9 in) |
| 1968 | 23.1 mm (0.9 in) |
| 1969 | 26.9 mm (1.1 in) |
| 1970 | 34.5 mm (1.4 in) |
| 1971 | 43.2 mm (1.7 in) |
| 1972 | 25.1 mm (1.0 in) |
| 1973 | 31.8 mm (1.3 in) |
| 1974 | 25.4 mm (1.0 in) |
| 1975 | 31.0 mm (1.2 in) |
| 1976 | 27.7 mm (1.1 in) |
| 1977 | 26.4 mm (1.0 in) |
| 1978 | 32.0 mm (1.3 in) |
| 1979 | 20.3 mm (0.8 in) |
| 1980 | 33.0 mm (1.3 in) |
| 1981 | 26.7 mm (1.1 in) |
| 1982 | 29.0 mm (1.1 in) |
| 1983 | 34.5 mm (1.4 in) |
| 1984 | 31.2 mm (1.2 in) |
| 1985 | 35.1 mm (1.4 in) |
| 1986 | 30.7 mm (1.2 in) |
| 1987 | 18.3 mm (0.7 in) |
| 1988 | 31.2 mm (1.2 in) |
| 1989 | 29.0 mm (1.1 in) |
| 1990 | 41.1 mm (1.6 in) |
| 1991 | 37.8 mm (1.5 in) |
| 1992 | 92.5 mm (3.6 in) |
| 1993 | 39.1 mm (1.5 in) |
| 1994 | 39.6 mm (1.6 in) |
| 1995 | 11.4 mm (0.4 in) |
| 1998 | 12.2 mm (0.5 in) |
| 1999 | 16.0 mm (0.6 in) |
| 2000 | 34.8 mm (1.4 in) |
| 2001 | 17.5 mm (0.7 in) |
| 2002 | 40.9 mm (1.6 in) |
| 2003 | 42.9 mm (1.7 in) |
| 2004 | 23.4 mm (0.9 in) |
| 2005 | 23.9 mm (0.9 in) |
| 2006 | 27.7 mm (1.1 in) |
| 2007 | 23.6 mm (0.9 in) |
| 2008 | 23.4 mm (0.9 in) |
| 2009 | 24.4 mm (1.0 in) |
| 2010 | 25.9 mm (1.0 in) |
| 2011 | 34.8 mm (1.4 in) |
| 2012 | 24.9 mm (1.0 in) |
| 2013 | 15.7 mm (0.6 in) |
| 2014 | 23.9 mm (0.9 in) |
| 2015 | 27.4 mm (1.1 in) |
| 2016 | 14.2 mm (0.6 in) |
| 2017 | 35.3 mm (1.4 in) |
| 2018 | 20.1 mm (0.8 in) |
| 2019 | 23.9 mm (0.9 in) |
| 2020 | 42.2 mm (1.7 in) |
| 2021 | 18.8 mm (0.7 in) |
| 2022 | 27.4 mm (1.1 in) |
| 2023 | 27.4 mm (1.1 in) |
| 2024 | 34.0 mm (1.3 in) |
| 2025 | 22.1 mm (0.9 in) |
| 2026 | 30.0 mm (1.2 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1949 | 36.0 mm (1.4 in) |
| 1950 | 65.6 mm (2.6 in) |
| 1951 | 56.6 mm (2.2 in) |
| 1952 | 37.6 mm (1.5 in) |
| 1953 | 54.4 mm (2.1 in) |
| 1954 | 43.1 mm (1.7 in) |
| 1955 | 52.0 mm (2.0 in) |
| 1956 | 49.4 mm (1.9 in) |
| 1957 | 51.0 mm (2.0 in) |
| 1958 | 41.6 mm (1.6 in) |
| 1959 | 51.4 mm (2.0 in) |
| 1960 | 34.3 mm (1.4 in) |
| 1961 | 44.5 mm (1.8 in) |
| 1962 | 58.6 mm (2.3 in) |
| 1963 | 56.5 mm (2.2 in) |
| 1964 | 54.4 mm (2.1 in) |
| 1965 | 44.7 mm (1.8 in) |
| 1966 | 42.4 mm (1.7 in) |
| 1967 | 35.5 mm (1.4 in) |
| 1968 | 49.3 mm (1.9 in) |
| 1969 | 40.6 mm (1.6 in) |
| 1970 | 51.3 mm (2.0 in) |
| 1971 | 60.7 mm (2.4 in) |
| 1972 | 31.7 mm (1.2 in) |
| 1973 | 42.0 mm (1.7 in) |
| 1974 | 33.5 mm (1.3 in) |
| 1975 | 56.7 mm (2.2 in) |
| 1976 | 43.9 mm (1.7 in) |
| 1977 | 53.0 mm (2.1 in) |
| 1978 | 44.5 mm (1.8 in) |
| 1979 | 40.1 mm (1.6 in) |
| 1980 | 45.3 mm (1.8 in) |
| 1981 | 63.5 mm (2.5 in) |
| 1982 | 52.7 mm (2.1 in) |
| 1983 | 52.3 mm (2.1 in) |
| 1984 | 50.0 mm (2.0 in) |
| 1985 | 35.1 mm (1.4 in) |
| 1986 | 46.0 mm (1.8 in) |
| 1987 | 32.8 mm (1.3 in) |
| 1988 | 47.9 mm (1.9 in) |
| 1989 | 45.2 mm (1.8 in) |
| 1990 | 58.9 mm (2.3 in) |
| 1991 | 92.7 mm (3.6 in) |
| 1992 | 117.6 mm (4.6 in) |
| 1993 | 52.4 mm (2.1 in) |
| 1994 | 92.9 mm (3.7 in) |
| 1995 | 32.8 mm (1.3 in) |
| 1998 | 26.9 mm (1.1 in) |
| 1999 | 34.5 mm (1.4 in) |
| 2000 | 71.1 mm (2.8 in) |
| 2001 | 29.2 mm (1.1 in) |
| 2002 | 48.9 mm (1.9 in) |
| 2003 | 58.7 mm (2.3 in) |
| 2004 | 49.2 mm (1.9 in) |
| 2005 | 66.6 mm (2.6 in) |
| 2006 | 70.1 mm (2.8 in) |
| 2007 | 38.7 mm (1.5 in) |
| 2008 | 39.4 mm (1.6 in) |
| 2009 | 48.8 mm (1.9 in) |
| 2010 | 35.8 mm (1.4 in) |
| 2011 | 53.1 mm (2.1 in) |
| 2012 | 37.9 mm (1.5 in) |
| 2013 | 28.1 mm (1.1 in) |
| 2014 | 33.0 mm (1.3 in) |
| 2015 | 41.9 mm (1.6 in) |
| 2016 | 34.4 mm (1.4 in) |
| 2017 | 46.7 mm (1.8 in) |
| 2018 | 42.9 mm (1.7 in) |
| 2019 | 39.1 mm (1.5 in) |
| 2020 | 51.8 mm (2.0 in) |
| 2021 | 32.1 mm (1.3 in) |
| 2022 | 65.5 mm (2.6 in) |
| 2023 | 37.1 mm (1.5 in) |
| 2024 | 41.1 mm (1.6 in) |
| 2025 | 30.5 mm (1.2 in) |
| 2026 | 45.7 mm (1.8 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1949 | 41 days |
| 1950 | 34 days |
| 1951 | 56 days |
| 1952 | 65 days |
| 1953 | 52 days |
| 1954 | 37 days |
| 1955 | 48 days |
| 1956 | 32 days |
| 1957 | 60 days |
| 1958 | 79 days |
| 1959 | 35 days |
| 1960 | 45 days |
| 1961 | 80 days |
| 1962 | 55 days |
| 1963 | 32 days |
| 1964 | 17 days |
| 1965 | 31 days |
| 1966 | 45 days |
| 1967 | 75 days |
| 1968 | 24 days |
| 1969 | 82 days |
| 1970 | 27 days |
| 1971 | 24 days |
| 1972 | 24 days |
| 1973 | 27 days |
| 1974 | 109 days |
| 1975 | 34 days |
| 1976 | 37 days |
| 1977 | 43 days |
| 1978 | 58 days |
| 1979 | 56 days |
| 1980 | 37 days |
| 1981 | 74 days |
| 1982 | 25 days |
| 1983 | 26 days |
| 1984 | 34 days |
| 1985 | 52 days |
| 1986 | 36 days |
| 1987 | 35 days |
| 1988 | 67 days |
| 1989 | 54 days |
| 1990 | 40 days |
| 1991 | 78 days |
| 1992 | 29 days |
| 1993 | 50 days |
| 1994 | 59 days |
| 1995 | 6 days |
| 1998 | 10 days |
| 1999 | 47 days |
| 2000 | 57 days |
| 2001 | 58 days |
| 2002 | 52 days |
| 2003 | 82 days |
| 2004 | 56 days |
| 2005 | 82 days |
| 2006 | 70 days |
| 2007 | 30 days |
| 2008 | 25 days |
| 2009 | 55 days |
| 2010 | 60 days |
| 2011 | 80 days |
| 2012 | 87 days |
| 2013 | 36 days |
| 2014 | 30 days |
| 2015 | 72 days |
| 2016 | 27 days |
| 2017 | 83 days |
| 2018 | 78 days |
| 2019 | 43 days |
| 2020 | 43 days |
| 2021 | 62 days |
| 2022 | 35 days |
| 2023 | 58 days |
| 2024 | 62 days |
| 2025 | 82 days |
| 2026 | 64 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
73 years with a frostAcross 73 years with a frost, the median last spring frost at Walla Walla Rgnl AP falls on 3 April and the median first autumn frost on 30 October, which leaves a median of 206 days between them.
In 1992 to 2025 the median growing season was 208 days. That is 7 days more than in 1949 to 1978.
Fitted over all years, the growing season changes by +2.2 days per decade at this station.
| Measure | Median, all years | Earliest period (1949 to 1978) | Recent period (1992 to 2025) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 3 April | 10 April | 3 April | 7 days earlier | -1.2 days per decade |
| First autumn frost | 30 October | 28 October | 1 November | 4 days later | +1.0 days per decade |
| Growing days | 206 days | 201 days | 208 days | 7 days more | +2.2 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.
Rainfall Return Levels
73 years, 1949 to 2025A day with at least 27.6 mm (1.1 in) of rain is expected about once in 2 years. A day with at least 58.9 mm (2.3 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 27.6 mm (1.1 in) | |
| 5 years | 35.1 mm (1.4 in) | |
| 10 years | 40.4 mm (1.6 in) | |
| 25 years | 47.5 mm (1.9 in) | |
| 50 years | 53.1 mm (2.1 in) | |
| 100 years | 58.9 mm (2.3 in) | Longer than the 73 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, 73 years of values from 1949 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: 92.5 mm (3.6 in) in 1992; 43.2 mm (1.7 in) in 1971; 42.9 mm (1.7 in) in 2003.
Station Changes
1 suspectedOne change was suspected in the annual mean temperature of Walla Walla Rgnl AP, at 2019. Each is measured against neighbouring stations.
- Relative to 5 neighbouring stations, the station's annual mean temperature from 2019 ran 0.5 C (0.8 F) lower than in the years before (likely change).
| Year | Shift (C) | Shift (F) | Strength | Neighbours |
|---|---|---|---|---|
| 2019 | -0.5 | -0.8 | likely | 5 |
Possible change at the station (a move, a new instrument or a new site); the record is kept as measured. A "likely" change has a larger test statistic than a "possible" one. Neither says why the station differs from its neighbours. How changes are found, and the largest ones.
Climate Twins
2011 to 2025 against 1961 to 1990Over 2011 to 2025, Walla Walla Rgnl AP had a mean temperature of 12.5 C (54.6 F) and 421.5 mm (16.6 in) of rain a year. The 3 stations whose 1961 to 1990 climate was closest to that are Riggins (United States, 168 km away), Colorado City (United States, 1,104 km away) and Veyo Powerhouse (United States, 1,044 km away).
| Twin station | Country | Distance away | Mean temperature, 1961-1990 | Rain a year, 1961-1990 | Climate difference |
|---|---|---|---|---|---|
| Riggins | United States | 168 km (104 mi) | 12.6 C (54.7 F) | 388.0 mm (15.3 in) | 0.69 |
| Colorado City | United States | 1,104 km (686 mi) | 12.7 C (54.9 F) | 319.0 mm (12.6 in) | 0.90 |
| Veyo Powerhouse | United States | 1,044 km (649 mi) | 12.5 C (54.4 F) | 335.2 mm (13.2 in) | 0.91 |
Twins are stations, not cities. A twin is one of the three stations at least 100 km away whose earlier climate is closest to this station's recent one, so a close match does not mean the two places look alike in other ways. A station move or a gap in a record can change that station's averages. The list describes past climate; it is not a forecast and does not say what caused any change. How twins are found, and a search for any station.
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 2026-10-16 (16 October 2026). Records are computed by this site and are not official.
Data as of . Last revised (2026-10-16).