Walla Walla WSO City Weather Records (USW00094103)
Record envelope, standing records and threshold days for Walla Walla WSO City (USW00094103), Washington, United States, with 73 years of record.
Key Facts for Walla Walla WSO City
Walla Walla WSO City (USW00094103) is a weather station in Washington, United States at 46.03 latitude and -118.33 longitude, 289 m (949 ft) above sea level.
The station reports from 1916 to 1988, 73 years of record.
1,464 records set at Walla Walla WSO City still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Walla Walla WSO City tied a daily record high maximum temperature of 37.8 C (100.0 F) on 23 August 1988.
About the Station
Location: Washington, United States, 46.03 latitude, -118.33 longitude.
Elevation: 289 m (949 ft).
Period of record: 1916 to 1988, 73 years.
Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
0 days at or beyond a record
Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at Walla Walla WSO City. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Walla Walla WSO City, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
21.7 C (71.1 F)
-26.7 C (-16.1 F)
n/a
n/a
Feb
25.0 C (77.0 F)
-25.6 C (-14.1 F)
n/a
n/a
Mar
26.1 C (79.0 F)
-10.6 C (12.9 F)
n/a
n/a
Apr
33.9 C (93.0 F)
-7.8 C (18.0 F)
n/a
n/a
May
38.3 C (100.9 F)
-3.3 C (26.1 F)
n/a
n/a
Jun
41.1 C (106.0 F)
3.9 C (39.0 F)
n/a
n/a
Jul
43.3 C (109.9 F)
7.2 C (45.0 F)
n/a
n/a
Aug
45.0 C (113.0 F)
5.6 C (42.1 F)
n/a
n/a
Sep
39.4 C (102.9 F)
-5.6 C (21.9 F)
n/a
n/a
Oct
32.2 C (90.0 F)
-5.6 C (21.9 F)
n/a
n/a
Nov
26.7 C (80.1 F)
-20.6 C (-5.1 F)
n/a
n/a
Dec
22.2 C (72.0 F)
-25.0 C (-13.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Walla Walla WSO City still stand. 1950 holds the most, with 49.
Standing records at Walla Walla WSO City by the year they were set
Year set
Standing records
1916
33
1917
28
1918
36
1919
23
1920
23
1921
27
1922
16
1923
11
1924
34
1925
28
1926
32
1927
27
1928
17
1929
18
1930
18
1948
11
1949
34
1950
49
1951
18
1952
24
1953
31
1954
25
1955
45
1956
40
1957
31
1958
25
1959
24
1960
40
1961
31
1962
27
1963
26
1964
21
1965
22
1966
20
1967
35
1968
35
1969
21
1970
17
1971
35
1972
45
1973
21
1974
27
1975
26
1976
9
1977
26
1978
13
1979
16
1980
25
1981
22
1982
15
1983
33
1984
14
1985
48
1986
35
1987
31
All-Time Record Progression
4 new records
4 all-time records were set at Walla Walla WSO City between 6 July 1968 and 14 October 1980. Each dot is a new record.
When Walla Walla WSO City set new all-time records
Date
Kind
Detail
1968-07-06
Record high minimum temperature
Record high minimum temperature 26.7 C (80.1 F)
1968-12-30
Record low maximum temperature
Record low maximum temperature -20.6 C (-5.1 F)
1971-05-26
Record daily precipitation
Record daily precipitation 48.5 mm (1.9 in)
1980-10-14
Record daily precipitation
Record daily precipitation 50.3 mm (2.0 in)
Wettest Day of Each Month
Oct: 50.3 mm (2.0 in)
The wettest day on record for each calendar month at Walla Walla WSO City. The most was 50.3 mm (2.0 in) on 14 October 1980.
Record daily precipitation for each month at Walla Walla WSO City
Month
Record daily precipitation (mm)
Date
Jan
29.7 mm (1.2 in)
15 January 1956
Feb
28.4 mm (1.1 in)
13 February 1970
Mar
31.5 mm (1.2 in)
4 March 1983
Apr
33.0 mm (1.3 in)
8 April 1917
May
48.5 mm (1.9 in)
26 May 1971
Jun
43.9 mm (1.7 in)
2 June 1923
Jul
26.4 mm (1.0 in)
13 July 1983
Aug
34.5 mm (1.4 in)
25 August 1965
Sep
26.7 mm (1.1 in)
11 September 1927
Oct
50.3 mm (2.0 in)
14 October 1980
Nov
28.4 mm (1.1 in)
23 November 1984
Dec
30.7 mm (1.2 in)
5 December 1971
Period of Record Coverage
1916 to 1988
Complete yearUnder 90 percent of days
56 years of record at Walla Walla WSO City, 1916 to 1988. 17 years have data for under 90 percent of days and are left out of rankings: 1916, 1917, 1918, 1919, 1920, 1921, 1922, 1923 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 39 complete years at Walla Walla WSO City, 1949 to 1987. Blue stripes are years cooler than the station's own mean of 12.2 C (54.0 F); red stripes are warmer. The coolest year was 1985, at 10.5 C (50.9 F), and the warmest was 1967, at 13.8 C (56.8 F). The strongest colour marks a difference of 1.8 C (3.2 F).
Annual mean temperature at Walla Walla WSO City as warming stripes, 1949 to 1987
Year
Annual mean temperature
Difference from the station mean
1949
11.8 C
-0.48 C
1950
11.3 C
-0.94 C
1951
12.0 C
-0.27 C
1952
12.5 C
+0.29 C
1953
13.5 C
+1.25 C
1954
11.8 C
-0.39 C
1955
10.9 C
-1.35 C
1956
11.7 C
-0.57 C
1957
11.7 C
-0.58 C
1958
13.7 C
+1.49 C
1959
11.8 C
-0.39 C
1960
11.9 C
-0.37 C
1961
13.0 C
+0.75 C
1962
12.2 C
-0.08 C
1963
12.3 C
+0.04 C
1964
11.7 C
-0.54 C
1965
12.7 C
+0.44 C
1966
13.0 C
+0.81 C
1967
13.8 C
+1.54 C
1968
12.6 C
+0.34 C
1969
11.7 C
-0.56 C
1970
12.2 C
+0.01 C
1971
12.4 C
+0.18 C
1972
11.8 C
-0.42 C
1973
12.8 C
+0.52 C
1974
12.9 C
+0.65 C
1975
12.0 C
-0.27 C
1976
12.0 C
-0.25 C
1977
12.1 C
-0.12 C
1978
11.7 C
-0.53 C
1979
12.2 C
-0.05 C
1980
11.9 C
-0.34 C
1981
12.7 C
+0.50 C
1982
12.1 C
-0.11 C
1983
12.6 C
+0.37 C
1984
11.8 C
-0.45 C
1985
10.5 C
-1.71 C
1986
12.8 C
+0.59 C
1987
13.2 C
+0.98 C
The fitted trend in annual mean temperature here over 1949 to 1987 is 0.04 C (-0.16 to 0.25) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.1 F (-0.3 to 0.4) 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 Walla Walla WSO City
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.04 C (-0.16 to 0.25) per decade
0.1 F (-0.3 to 0.4) per decade
1949 to 1987
39
Not clearly different from zero
Mean daily maximum
0.1 C (-0.1 to 0.3) per decade
0.1 F (-0.3 to 0.5) per decade
1949 to 1987
39
Not clearly different from zero
Mean daily minimum
0.01 C (-0.18 to 0.20) per decade
0.01 F (-0.33 to 0.35) per decade
1949 to 1987
39
Not 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
1916 to 1988
Yearly extremes at Walla Walla WSO City: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
45.0 C (113.0 F)
1961
40.0 C (104.0 F)
56
Coldest night (TNn)
-26.7 C (-16.1 F)
1950
-12.5 C (9.5 F)
56
Wettest day (Rx1day)
50.3 mm (2.0 in)
1980
26.1 mm (1.0 in)
56
Wettest five days (Rx5day)
91.9 mm (3.6 in)
1980
41.4 mm (1.6 in)
56
Longest dry spell (CDD)
109 days
1974
42 days
56
Hottest day (TXx)
The hottest day of the year at Walla Walla WSO City, 1916 to 1988. The record is 45.0 C (113.0 F) in 1961, marked on the chart; the median year is 40.0 C (104.0 F).
Hottest day (TXx) at Walla Walla WSO City by year
Year
Hottest day (TXx)
1916
40.0 C (104.0 F)
1917
40.6 C (105.1 F)
1918
43.3 C (109.9 F)
1919
40.6 C (105.1 F)
1920
40.0 C (104.0 F)
1921
37.8 C (100.0 F)
1922
42.8 C (109.0 F)
1923
40.6 C (105.1 F)
1924
42.2 C (108.0 F)
1925
41.1 C (106.0 F)
1926
41.7 C (107.1 F)
1927
41.1 C (106.0 F)
1928
38.3 C (100.9 F)
1929
42.2 C (108.0 F)
1930
42.2 C (108.0 F)
1948
39.4 C (102.9 F)
1949
39.4 C (102.9 F)
1950
39.4 C (102.9 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
36.1 C (97.0 F)
1958
40.6 C (105.1 F)
1959
41.7 C (107.1 F)
1960
43.3 C (109.9 F)
1961
45.0 C (113.0 F)
1962
39.4 C (102.9 F)
1963
37.8 C (100.0 F)
1964
39.4 C (102.9 F)
1965
40.0 C (104.0 F)
1966
36.7 C (98.1 F)
1967
40.6 C (105.1 F)
1968
41.1 C (106.0 F)
1969
36.7 C (98.1 F)
1970
39.4 C (102.9 F)
1971
41.1 C (106.0 F)
1972
42.2 C (108.0 F)
1973
38.9 C (102.0 F)
1974
39.4 C (102.9 F)
1975
43.3 C (109.9 F)
1976
38.3 C (100.9 F)
1977
40.6 C (105.1 F)
1978
40.6 C (105.1 F)
1979
41.7 C (107.1 F)
1980
39.4 C (102.9 F)
1981
40.0 C (104.0 F)
1982
40.0 C (104.0 F)
1983
38.3 C (100.9 F)
1984
39.4 C (102.9 F)
1985
40.6 C (105.1 F)
1986
40.0 C (104.0 F)
1987
39.4 C (102.9 F)
1988
37.8 C (100.0 F)
Coldest night (TNn)
The coldest night of the year at Walla Walla WSO City, 1916 to 1988. The record is -26.7 C (-16.1 F) in 1950, marked on the chart; the median year is -12.5 C (9.5 F).
Coldest night (TNn) at Walla Walla WSO City by year
Year
Coldest night (TNn)
1916
-12.2 C (10.0 F)
1917
-5.0 C (23.0 F)
1918
-5.0 C (23.0 F)
1919
-5.0 C (23.0 F)
1920
-3.3 C (26.1 F)
1921
-2.8 C (27.0 F)
1922
-6.1 C (21.0 F)
1923
-4.4 C (24.1 F)
1924
-6.7 C (19.9 F)
1925
-6.1 C (21.0 F)
1926
-5.6 C (21.9 F)
1927
-7.8 C (18.0 F)
1928
-3.9 C (25.0 F)
1929
-2.8 C (27.0 F)
1930
-3.9 C (25.0 F)
1948
-13.3 C (8.1 F)
1949
-19.4 C (-2.9 F)
1950
-26.7 C (-16.1 F)
1951
-15.6 C (3.9 F)
1952
-12.8 C (9.0 F)
1953
-2.2 C (28.0 F)
1954
-21.1 C (-6.0 F)
1955
-17.2 C (1.0 F)
1956
-22.2 C (-8.0 F)
1957
-26.7 C (-16.1 F)
1958
-8.9 C (16.0 F)
1959
-18.9 C (-2.0 F)
1960
-13.3 C (8.1 F)
1961
-14.4 C (6.1 F)
1962
-17.2 C (1.0 F)
1963
-17.8 C (0.0 F)
1964
-21.1 C (-6.0 F)
1965
-7.8 C (18.0 F)
1966
-4.4 C (24.1 F)
1967
-10.6 C (12.9 F)
1968
-25.0 C (-13.0 F)
1969
-17.8 C (0.0 F)
1970
-11.1 C (12.0 F)
1971
-11.1 C (12.0 F)
1972
-20.0 C (-4.0 F)
1973
-17.8 C (0.0 F)
1974
-20.0 C (-4.0 F)
1975
-10.0 C (14.0 F)
1976
-10.0 C (14.0 F)
1977
-16.1 C (3.0 F)
1978
-20.0 C (-4.0 F)
1979
-23.3 C (-9.9 F)
1980
-15.6 C (3.9 F)
1981
-10.0 C (14.0 F)
1982
-15.6 C (3.9 F)
1983
-23.3 C (-9.9 F)
1984
-17.2 C (1.0 F)
1985
-20.6 C (-5.1 F)
1986
-7.2 C (19.0 F)
1987
-11.7 C (10.9 F)
1988
10.0 C (50.0 F)
Wettest day (Rx1day)
The wettest day of the year at Walla Walla WSO City, 1916 to 1988. The record is 50.3 mm (2.0 in) in 1980, marked on the chart; the median year is 26.1 mm (1.0 in).
Wettest day (Rx1day) at Walla Walla WSO City by year
Year
Wettest day (Rx1day)
1916
20.6 mm (0.8 in)
1917
33.0 mm (1.3 in)
1918
17.5 mm (0.7 in)
1919
21.6 mm (0.9 in)
1920
21.6 mm (0.9 in)
1921
22.4 mm (0.9 in)
1922
18.0 mm (0.7 in)
1923
43.9 mm (1.7 in)
1924
21.8 mm (0.9 in)
1925
33.0 mm (1.3 in)
1926
19.8 mm (0.8 in)
1927
26.7 mm (1.1 in)
1928
17.3 mm (0.7 in)
1929
27.4 mm (1.1 in)
1930
17.8 mm (0.7 in)
1948
29.2 mm (1.1 in)
1949
20.3 mm (0.8 in)
1950
38.9 mm (1.5 in)
1951
29.2 mm (1.1 in)
1952
20.6 mm (0.8 in)
1953
29.5 mm (1.2 in)
1954
23.4 mm (0.9 in)
1955
26.2 mm (1.0 in)
1956
29.7 mm (1.2 in)
1957
38.6 mm (1.5 in)
1958
41.1 mm (1.6 in)
1959
27.2 mm (1.1 in)
1960
21.8 mm (0.9 in)
1961
22.6 mm (0.9 in)
1962
26.2 mm (1.0 in)
1963
22.6 mm (0.9 in)
1964
27.4 mm (1.1 in)
1965
34.5 mm (1.4 in)
1966
24.1 mm (0.9 in)
1967
16.3 mm (0.6 in)
1968
25.9 mm (1.0 in)
1969
21.1 mm (0.8 in)
1970
30.7 mm (1.2 in)
1971
48.5 mm (1.9 in)
1972
25.9 mm (1.0 in)
1973
26.2 mm (1.0 in)
1974
19.3 mm (0.8 in)
1975
26.2 mm (1.0 in)
1976
22.9 mm (0.9 in)
1977
29.7 mm (1.2 in)
1978
31.8 mm (1.3 in)
1979
20.1 mm (0.8 in)
1980
50.3 mm (2.0 in)
1981
20.6 mm (0.8 in)
1982
27.9 mm (1.1 in)
1983
31.5 mm (1.2 in)
1984
28.4 mm (1.1 in)
1985
16.8 mm (0.7 in)
1986
29.0 mm (1.1 in)
1987
19.1 mm (0.8 in)
1988
0.0 mm (0.00 in)
Wettest five days (Rx5day)
The wettest five days of the year at Walla Walla WSO City, 1916 to 1988. The record is 91.9 mm (3.6 in) in 1980, marked on the chart; the median year is 41.4 mm (1.6 in).
Wettest five days (Rx5day) at Walla Walla WSO City by year
Year
Wettest five days (Rx5day)
1916
33.0 mm (1.3 in)
1917
43.4 mm (1.7 in)
1918
21.3 mm (0.8 in)
1919
27.4 mm (1.1 in)
1920
37.8 mm (1.5 in)
1921
59.2 mm (2.3 in)
1922
23.8 mm (0.9 in)
1923
59.1 mm (2.3 in)
1924
39.3 mm (1.5 in)
1925
37.6 mm (1.5 in)
1926
36.7 mm (1.4 in)
1927
67.7 mm (2.7 in)
1928
26.7 mm (1.1 in)
1929
27.7 mm (1.1 in)
1930
34.8 mm (1.4 in)
1948
35.7 mm (1.4 in)
1949
34.5 mm (1.4 in)
1950
59.7 mm (2.4 in)
1951
60.1 mm (2.4 in)
1952
29.5 mm (1.2 in)
1953
46.5 mm (1.8 in)
1954
33.8 mm (1.3 in)
1955
46.1 mm (1.8 in)
1956
45.2 mm (1.8 in)
1957
54.1 mm (2.1 in)
1958
51.0 mm (2.0 in)
1959
50.1 mm (2.0 in)
1960
30.5 mm (1.2 in)
1961
38.8 mm (1.5 in)
1962
50.6 mm (2.0 in)
1963
51.4 mm (2.0 in)
1964
48.3 mm (1.9 in)
1965
43.9 mm (1.7 in)
1966
41.1 mm (1.6 in)
1967
28.2 mm (1.1 in)
1968
55.1 mm (2.2 in)
1969
38.1 mm (1.5 in)
1970
48.9 mm (1.9 in)
1971
55.1 mm (2.2 in)
1972
33.1 mm (1.3 in)
1973
35.6 mm (1.4 in)
1974
26.7 mm (1.1 in)
1975
48.4 mm (1.9 in)
1976
28.7 mm (1.1 in)
1977
52.1 mm (2.1 in)
1978
44.4 mm (1.7 in)
1979
40.2 mm (1.6 in)
1980
91.9 mm (3.6 in)
1981
52.8 mm (2.1 in)
1982
51.5 mm (2.0 in)
1983
47.6 mm (1.9 in)
1984
46.3 mm (1.8 in)
1985
33.7 mm (1.3 in)
1986
41.7 mm (1.6 in)
1987
27.7 mm (1.1 in)
1988
0.0 mm (0.00 in)
Longest dry spell (CDD)
The longest dry spell of the year at Walla Walla WSO City, 1916 to 1988. The record is 109 days in 1974, marked on the chart; the median year is 42 days.
Longest dry spell (CDD) at Walla Walla WSO City by year
Year
Longest dry spell (CDD)
1916
48 days
1917
78 days
1918
27 days
1919
37 days
1920
28 days
1921
25 days
1922
44 days
1923
34 days
1924
37 days
1925
64 days
1926
57 days
1927
65 days
1928
31 days
1929
98 days
1930
36 days
1948
25 days
1949
41 days
1950
32 days
1951
57 days
1952
65 days
1953
71 days
1954
31 days
1955
47 days
1956
48 days
1957
60 days
1958
71 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
81 days
1968
39 days
1969
81 days
1970
39 days
1971
23 days
1972
29 days
1973
32 days
1974
109 days
1975
53 days
1976
25 days
1977
43 days
1978
47 days
1979
42 days
1980
38 days
1981
81 days
1982
39 days
1983
33 days
1984
61 days
1985
52 days
1986
37 days
1987
42 days
1988
31 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
39 years with a frost
Across 39 years with a frost, the median last spring frost at Walla Walla WSO City falls on 29 March and the median first autumn frost on 3 November, which leaves a median of 225 days between them.
Fitted over all years, the growing season changes by +2.9 days per decade at this station.
Frost dates and growing season at Walla Walla WSO City
Measure
Median, all years
Earliest period
Recent period (1958 to 1987)
Recent against earliest
Fitted trend
Last spring frost
29 March
n/a
25 March
n/a
-4.4 days per decade
First autumn frost
3 November
n/a
3 November
n/a
-1.5 days per decade
Growing days
225 days
n/a
227 days
n/a
+2.9 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
39 years, 1949 to 1987
A day with at least 25.9 mm (1.0 in) of rain is expected about once in 2 years. A day with at least 54.5 mm (2.1 in) of rain is expected about once in 100 years.
Rainfall return levels at Walla Walla WSO City: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
25.9 mm (1.0 in)
5 years
32.7 mm (1.3 in)
10 years
37.5 mm (1.5 in)
25 years
43.9 mm (1.7 in)
50 years
49.1 mm (1.9 in)
Longer than the 39 years of record
100 years
54.5 mm (2.1 in)
Longer than the 39 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, 39 years of values from 1949 to 1987.
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: 50.3 mm (2.0 in) in 1980; 48.5 mm (1.9 in) in 1971; 41.1 mm (1.6 in) in 1958.
Download the Data
Data for Walla Walla WSO City standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Walla Walla WSO City 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 2026-10-15 (15 October 2026). Records are computed by this site and are not official.