Record envelope, standing records and threshold days for Seattle Urban Site (USW00024281), Washington, United States, with 105 years of record.
Key Facts for Seattle Urban Site
Seattle Urban Site (USW00024281) is a weather station in Washington, United States at 47.65 latitude and -122.30 longitude, 6 m (19 ft) above sea level.
The station reports from 1894 to 1998, 105 years of record.
1,464 records set at Seattle Urban Site still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Seattle Urban Site set a daily record precipitation of 40.1 mm (1.6 in) on 23 January 1998.
About the Station
Location: Washington, United States, 47.65 latitude, -122.30 longitude.
Elevation: 6 m (19 ft).
Period of record: 1894 to 1998, 105 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 Seattle Urban Site. 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 Seattle Urban Site, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
19.4 C (66.9 F)
-11.7 C (10.9 F)
n/a
n/a
Feb
23.3 C (73.9 F)
-11.7 C (10.9 F)
n/a
n/a
Mar
24.4 C (75.9 F)
-6.7 C (19.9 F)
n/a
n/a
Apr
30.6 C (87.1 F)
-1.1 C (30.0 F)
n/a
n/a
May
33.3 C (91.9 F)
1.7 C (35.1 F)
n/a
n/a
Jun
37.8 C (100.0 F)
4.4 C (39.9 F)
n/a
n/a
Jul
37.8 C (100.0 F)
6.7 C (44.1 F)
n/a
n/a
Aug
36.1 C (97.0 F)
7.8 C (46.0 F)
n/a
n/a
Sep
33.3 C (91.9 F)
2.2 C (36.0 F)
n/a
n/a
Oct
27.8 C (82.0 F)
-1.7 C (28.9 F)
n/a
n/a
Nov
22.8 C (73.0 F)
-10.6 C (12.9 F)
n/a
n/a
Dec
18.3 C (64.9 F)
-12.8 C (9.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Seattle Urban Site still stand. 1895 holds the most, with 38.
Standing records at Seattle Urban Site by the year they were set
Year set
Standing records
1894
32
1895
38
1896
28
1897
17
1898
13
1899
32
1900
18
1901
21
1902
18
1903
13
1904
18
1905
19
1906
15
1907
12
1908
18
1909
31
1910
12
1911
19
1912
13
1913
14
1914
16
1915
8
1916
28
1917
29
1918
10
1919
34
1920
16
1921
8
1922
17
1923
14
1924
25
1925
9
1926
18
1927
12
1928
10
1929
7
1930
7
1931
9
1932
13
1933
12
1934
20
1935
32
1936
13
1937
5
1938
8
1939
10
1940
24
1941
26
1942
15
1943
10
1944
11
1945
9
1946
4
1947
10
1948
7
1949
12
1950
27
1951
14
1952
13
1953
12
1954
6
1955
22
1956
13
1957
9
1958
19
1959
7
1960
12
1961
15
1962
10
1963
20
1964
5
1965
10
1966
17
1967
11
1968
22
1969
9
1970
12
1971
15
1972
22
1973
4
1974
8
1975
7
1976
7
1977
7
1978
4
1979
7
1980
11
1981
13
1982
8
1983
11
1984
4
1985
19
1986
13
1987
11
1988
7
1989
7
1990
13
1991
10
1992
12
1993
8
1994
5
1995
7
1996
10
1997
10
All-Time Record Progression
6 new records
6 all-time records were set at Seattle Urban Site between 25 June 1925 and 21 December 1990. Each dot is a new record.
When Seattle Urban Site set new all-time records
Date
Kind
Detail
1925-06-25
Record high maximum temperature
Record high maximum temperature 36.7 C (98.1 F)
1938-07-14
Record high minimum temperature
Record high minimum temperature 20.0 C (68.0 F)
1941-07-16
Record high maximum temperature
Record high maximum temperature 37.8 C (100.0 F)
1968-12-30
Record low minimum temperature
Record low minimum temperature -12.2 C (10.0 F)
1986-01-18
Record daily precipitation
Record daily precipitation 107.2 mm (4.2 in)
1990-12-21
Record low minimum temperature
Record low minimum temperature -12.8 C (9.0 F)
Wettest Day of Each Month
Jan: 107.2 mm (4.2 in)
The wettest day on record for each calendar month at Seattle Urban Site. The most was 107.2 mm (4.2 in) on 18 January 1986.
Record daily precipitation for each month at Seattle Urban Site
Month
Record daily precipitation (mm)
Date
Jan
107.2 mm (4.2 in)
18 January 1986
Feb
66.8 mm (2.6 in)
8 February 1996
Mar
65.3 mm (2.6 in)
10 March 1903
Apr
55.9 mm (2.2 in)
23 April 1996
May
31.2 mm (1.2 in)
22 May 1996
Jun
36.1 mm (1.4 in)
3 June 1905
Jul
24.9 mm (1.0 in)
5 July 1897
Aug
39.1 mm (1.5 in)
23 August 1977
Sep
43.2 mm (1.7 in)
30 September 1953
Oct
65.3 mm (2.6 in)
6 October 1981
Nov
68.1 mm (2.7 in)
13 November 1937
Dec
86.4 mm (3.4 in)
11 December 1921
Period of Record Coverage
1894 to 1998
Complete yearUnder 90 percent of days
105 years of record at Seattle Urban Site, 1894 to 1998. 2 years have data for under 90 percent of days and are left out of rankings: 1945, 1998.
Cooler than the station meanWarmer than the station mean
One stripe for each of 102 complete years at Seattle Urban Site, 1894 to 1997. Blue stripes are years cooler than the station's own mean of 11.4 C (52.6 F); red stripes are warmer. The coolest year was 1916, at 9.6 C (49.2 F), and the warmest was 1958, at 13.5 C (56.2 F). The strongest colour marks a difference of 2.1 C (3.8 F).
Annual mean temperature at Seattle Urban Site as warming stripes, 1894 to 1997
Year
Annual mean temperature
Difference from the station mean
1894
10.2 C
-1.23 C
1895
10.6 C
-0.81 C
1896
10.6 C
-0.85 C
1897
10.8 C
-0.61 C
1898
11.2 C
-0.20 C
1899
10.8 C
-0.69 C
1900
11.6 C
+0.13 C
1901
11.1 C
-0.35 C
1902
11.2 C
-0.21 C
1903
10.7 C
-0.75 C
1904
11.3 C
-0.12 C
1905
11.1 C
-0.35 C
1906
11.4 C
-0.03 C
1907
10.6 C
-0.85 C
1908
10.5 C
-0.95 C
1909
9.8 C
-1.62 C
1910
10.5 C
-0.94 C
1911
10.1 C
-1.31 C
1912
10.9 C
-0.59 C
1913
10.3 C
-1.13 C
1914
11.2 C
-0.22 C
1915
11.5 C
+0.08 C
1916
9.6 C
-1.88 C
1917
10.4 C
-1.00 C
1918
10.9 C
-0.53 C
1919
10.2 C
-1.21 C
1920
10.4 C
-1.09 C
1921
10.3 C
-1.15 C
1922
10.0 C
-1.47 C
1923
11.0 C
-0.41 C
1924
10.8 C
-0.62 C
1925
11.5 C
+0.03 C
1926
12.2 C
+0.79 C
1927
10.8 C
-0.63 C
1928
11.2 C
-0.20 C
1929
10.5 C
-0.95 C
1930
10.7 C
-0.73 C
1931
11.6 C
+0.14 C
1932
10.9 C
-0.53 C
1933
10.9 C
-0.53 C
1934
12.9 C
+1.47 C
1935
11.5 C
+0.01 C
1936
11.8 C
+0.33 C
1937
11.5 C
+0.06 C
1938
12.1 C
+0.67 C
1939
12.3 C
+0.83 C
1940
13.1 C
+1.63 C
1941
13.0 C
+1.51 C
1942
12.1 C
+0.68 C
1943
11.5 C
+0.09 C
1944
12.0 C
+0.58 C
1946
11.6 C
+0.15 C
1947
12.2 C
+0.79 C
1948
10.9 C
-0.58 C
1949
11.3 C
-0.17 C
1950
11.0 C
-0.40 C
1951
11.6 C
+0.16 C
1952
11.8 C
+0.38 C
1953
12.1 C
+0.68 C
1954
11.2 C
-0.24 C
1955
10.3 C
-1.18 C
1956
11.3 C
-0.17 C
1957
11.8 C
+0.39 C
1958
13.5 C
+2.01 C
1959
11.8 C
+0.34 C
1960
11.8 C
+0.34 C
1961
12.4 C
+0.93 C
1962
12.0 C
+0.55 C
1963
12.1 C
+0.66 C
1964
11.4 C
-0.05 C
1965
12.3 C
+0.90 C
1966
12.5 C
+1.07 C
1967
12.9 C
+1.41 C
1968
12.4 C
+1.00 C
1969
11.8 C
+0.36 C
1970
12.0 C
+0.54 C
1971
11.2 C
-0.25 C
1973
11.3 C
-0.10 C
1974
11.6 C
+0.16 C
1975
11.1 C
-0.34 C
1976
11.5 C
+0.09 C
1977
11.3 C
-0.17 C
1978
11.5 C
+0.05 C
1979
11.7 C
+0.29 C
1980
11.6 C
+0.20 C
1981
12.3 C
+0.89 C
1982
11.3 C
-0.12 C
1983
12.2 C
+0.72 C
1984
11.6 C
+0.14 C
1985
10.7 C
-0.74 C
1986
12.3 C
+0.86 C
1987
12.5 C
+1.10 C
1988
11.7 C
+0.25 C
1989
11.5 C
+0.02 C
1990
11.8 C
+0.33 C
1991
11.6 C
+0.15 C
1992
12.3 C
+0.81 C
1993
11.8 C
+0.32 C
1994
12.2 C
+0.78 C
1995
12.6 C
+1.12 C
1996
11.5 C
+0.08 C
1997
12.3 C
+0.83 C
The annual mean temperature here has risen by 0.1 C (0.1 to 0.2) per decade over 1894 to 1997. In Fahrenheit: 0.3 F (0.2 to 0.3) per decade. The slope is a straight line fitted to 102 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Seattle Urban Site
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.1 C (0.1 to 0.2) per decade
0.3 F (0.2 to 0.3) per decade
1894 to 1997
102
Rise
Mean daily maximum
0.2 C (0.1 to 0.2) per decade
0.3 F (0.2 to 0.4) per decade
1894 to 1997
102
Rise
Mean daily minimum
0.1 C (0.1 to 0.2) per decade
0.2 F (0.1 to 0.3) per decade
1894 to 1997
102
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
1894 to 1998
Yearly extremes at Seattle Urban Site: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
37.8 C (100.0 F)
1941
32.2 C (90.0 F)
105
Coldest night (TNn)
-12.8 C (9.0 F)
1990
-6.1 C (21.0 F)
105
Wettest day (Rx1day)
107.2 mm (4.2 in)
1986
42.4 mm (1.7 in)
105
Wettest five days (Rx5day)
166.2 mm (6.5 in)
1997
88.5 mm (3.5 in)
105
Longest dry spell (CDD)
77 days
1922
31 days
105
Hottest day (TXx)
The hottest day of the year at Seattle Urban Site, 1894 to 1998. The record is 37.8 C (100.0 F) in 1941, marked on the chart; the median year is 32.2 C (90.0 F).
Hottest day (TXx) at Seattle Urban Site by year
Year
Hottest day (TXx)
1894
31.1 C (88.0 F)
1895
32.2 C (90.0 F)
1896
33.9 C (93.0 F)
1897
32.2 C (90.0 F)
1898
33.3 C (91.9 F)
1899
32.2 C (90.0 F)
1900
30.0 C (86.0 F)
1901
30.6 C (87.1 F)
1902
35.0 C (95.0 F)
1903
35.6 C (96.1 F)
1904
32.2 C (90.0 F)
1905
32.2 C (90.0 F)
1906
35.0 C (95.0 F)
1907
32.8 C (91.0 F)
1908
31.1 C (88.0 F)
1909
28.9 C (84.0 F)
1910
30.0 C (86.0 F)
1911
33.3 C (91.9 F)
1912
32.2 C (90.0 F)
1913
31.1 C (88.0 F)
1914
31.1 C (88.0 F)
1915
31.7 C (89.1 F)
1916
31.7 C (89.1 F)
1917
28.9 C (84.0 F)
1918
28.9 C (84.0 F)
1919
30.0 C (86.0 F)
1920
31.7 C (89.1 F)
1921
26.7 C (80.1 F)
1922
31.7 C (89.1 F)
1923
31.1 C (88.0 F)
1924
32.8 C (91.0 F)
1925
36.7 C (98.1 F)
1926
33.9 C (93.0 F)
1927
32.8 C (91.0 F)
1928
31.7 C (89.1 F)
1929
28.9 C (84.0 F)
1930
31.7 C (89.1 F)
1931
32.8 C (91.0 F)
1932
31.7 C (89.1 F)
1933
33.3 C (91.9 F)
1934
33.3 C (91.9 F)
1935
34.4 C (93.9 F)
1936
31.7 C (89.1 F)
1937
33.3 C (91.9 F)
1938
33.3 C (91.9 F)
1939
34.4 C (93.9 F)
1940
31.7 C (89.1 F)
1941
37.8 C (100.0 F)
1942
36.7 C (98.1 F)
1943
30.0 C (86.0 F)
1944
35.6 C (96.1 F)
1945
31.7 C (89.1 F)
1946
32.2 C (90.0 F)
1947
30.6 C (87.1 F)
1948
31.7 C (89.1 F)
1949
31.7 C (89.1 F)
1950
32.2 C (90.0 F)
1951
35.6 C (96.1 F)
1952
33.9 C (93.0 F)
1953
31.7 C (89.1 F)
1954
27.8 C (82.0 F)
1955
37.8 C (100.0 F)
1956
34.4 C (93.9 F)
1957
29.4 C (84.9 F)
1958
36.7 C (98.1 F)
1959
34.4 C (93.9 F)
1960
36.1 C (97.0 F)
1961
35.6 C (96.1 F)
1962
32.2 C (90.0 F)
1963
33.3 C (91.9 F)
1964
30.0 C (86.0 F)
1965
34.4 C (93.9 F)
1966
31.1 C (88.0 F)
1967
34.4 C (93.9 F)
1968
32.8 C (91.0 F)
1969
33.3 C (91.9 F)
1970
33.3 C (91.9 F)
1971
34.4 C (93.9 F)
1972
32.8 C (91.0 F)
1973
31.1 C (88.0 F)
1974
32.2 C (90.0 F)
1975
31.1 C (88.0 F)
1976
29.4 C (84.9 F)
1977
33.9 C (93.0 F)
1978
33.9 C (93.0 F)
1979
32.2 C (90.0 F)
1980
29.4 C (84.9 F)
1981
34.4 C (93.9 F)
1982
33.3 C (91.9 F)
1983
29.4 C (84.9 F)
1984
30.6 C (87.1 F)
1985
32.8 C (91.0 F)
1986
32.2 C (90.0 F)
1987
31.1 C (88.0 F)
1988
33.3 C (91.9 F)
1989
30.0 C (86.0 F)
1990
31.1 C (88.0 F)
1991
35.6 C (96.1 F)
1992
33.3 C (91.9 F)
1993
34.4 C (93.9 F)
1994
34.4 C (93.9 F)
1995
33.9 C (93.0 F)
1996
34.4 C (93.9 F)
1997
32.2 C (90.0 F)
1998
25.0 C (77.0 F)
Coldest night (TNn)
The coldest night of the year at Seattle Urban Site, 1894 to 1998. The record is -12.8 C (9.0 F) in 1990, marked on the chart; the median year is -6.1 C (21.0 F).
Coldest night (TNn) at Seattle Urban Site by year
Year
Coldest night (TNn)
1894
-6.1 C (21.0 F)
1895
-2.8 C (27.0 F)
1896
-9.4 C (15.1 F)
1897
-6.7 C (19.9 F)
1898
-2.8 C (27.0 F)
1899
-11.1 C (12.0 F)
1900
-6.1 C (21.0 F)
1901
-2.2 C (28.0 F)
1902
-10.6 C (12.9 F)
1903
-4.4 C (24.1 F)
1904
-2.8 C (27.0 F)
1905
-6.7 C (19.9 F)
1906
-4.4 C (24.1 F)
1907
-11.7 C (10.9 F)
1908
-3.9 C (25.0 F)
1909
-11.1 C (12.0 F)
1910
-5.6 C (21.9 F)
1911
-7.2 C (19.0 F)
1912
-4.4 C (24.1 F)
1913
-5.6 C (21.9 F)
1914
-4.4 C (24.1 F)
1915
-4.4 C (24.1 F)
1916
-10.0 C (14.0 F)
1917
-8.9 C (16.0 F)
1918
-4.4 C (24.1 F)
1919
-11.1 C (12.0 F)
1920
-4.4 C (24.1 F)
1921
-7.2 C (19.0 F)
1922
-8.9 C (16.0 F)
1923
-9.4 C (15.1 F)
1924
-11.1 C (12.0 F)
1925
-1.1 C (30.0 F)
1926
-6.7 C (19.9 F)
1927
-8.3 C (17.1 F)
1928
-5.6 C (21.9 F)
1929
-7.8 C (18.0 F)
1930
-7.8 C (18.0 F)
1931
-1.7 C (28.9 F)
1932
-7.2 C (19.0 F)
1933
-8.9 C (16.0 F)
1934
0.0 C (32.0 F)
1935
-10.0 C (14.0 F)
1936
-7.2 C (19.0 F)
1937
-8.9 C (16.0 F)
1938
-2.2 C (28.0 F)
1939
-3.3 C (26.1 F)
1940
-1.1 C (30.0 F)
1941
-2.8 C (27.0 F)
1942
-5.6 C (21.9 F)
1943
-8.9 C (16.0 F)
1944
-3.9 C (25.0 F)
1945
-2.2 C (28.0 F)
1946
-2.8 C (27.0 F)
1947
-6.7 C (19.9 F)
1948
-6.1 C (21.0 F)
1949
-6.7 C (19.9 F)
1950
-11.7 C (10.9 F)
1951
-6.7 C (19.9 F)
1952
-7.2 C (19.0 F)
1953
0.0 C (32.0 F)
1954
-5.6 C (21.9 F)
1955
-10.6 C (12.9 F)
1956
-8.3 C (17.1 F)
1957
-8.9 C (16.0 F)
1958
-1.7 C (28.9 F)
1959
-7.8 C (18.0 F)
1960
-1.7 C (28.9 F)
1961
-2.2 C (28.0 F)
1962
-6.7 C (19.9 F)
1963
-8.3 C (17.1 F)
1964
-11.7 C (10.9 F)
1965
-2.2 C (28.0 F)
1966
0.6 C (33.1 F)
1967
-1.1 C (30.0 F)
1968
-12.2 C (10.0 F)
1969
-6.7 C (19.9 F)
1970
-2.8 C (27.0 F)
1971
-3.3 C (26.1 F)
1972
-9.4 C (15.1 F)
1973
-8.9 C (16.0 F)
1974
-6.7 C (19.9 F)
1975
-4.4 C (24.1 F)
1976
-3.9 C (25.0 F)
1977
-6.7 C (19.9 F)
1978
-10.0 C (14.0 F)
1979
-8.3 C (17.1 F)
1980
-8.9 C (16.0 F)
1981
-3.3 C (26.1 F)
1982
-7.8 C (18.0 F)
1983
-11.1 C (12.0 F)
1984
-5.0 C (23.0 F)
1985
-10.6 C (12.9 F)
1986
-5.0 C (23.0 F)
1987
-3.3 C (26.1 F)
1988
-3.9 C (25.0 F)
1989
-11.7 C (10.9 F)
1990
-12.8 C (9.0 F)
1991
-4.4 C (24.1 F)
1992
-2.8 C (27.0 F)
1993
-6.1 C (21.0 F)
1994
-5.0 C (23.0 F)
1995
-3.9 C (25.0 F)
1996
-8.3 C (17.1 F)
1997
-4.4 C (24.1 F)
1998
-4.4 C (24.1 F)
Wettest day (Rx1day)
The wettest day of the year at Seattle Urban Site, 1894 to 1998. The record is 107.2 mm (4.2 in) in 1986, marked on the chart; the median year is 42.4 mm (1.7 in).
Wettest day (Rx1day) at Seattle Urban Site by year
Year
Wettest day (Rx1day)
1894
55.6 mm (2.2 in)
1895
52.1 mm (2.1 in)
1896
44.7 mm (1.8 in)
1897
73.4 mm (2.9 in)
1898
51.8 mm (2.0 in)
1899
26.7 mm (1.1 in)
1900
50.8 mm (2.0 in)
1901
30.7 mm (1.2 in)
1902
51.3 mm (2.0 in)
1903
65.3 mm (2.6 in)
1904
50.5 mm (2.0 in)
1905
36.1 mm (1.4 in)
1906
68.3 mm (2.7 in)
1907
35.8 mm (1.4 in)
1908
32.5 mm (1.3 in)
1909
32.5 mm (1.3 in)
1910
46.2 mm (1.8 in)
1911
28.7 mm (1.1 in)
1912
35.3 mm (1.4 in)
1913
23.9 mm (0.9 in)
1914
38.4 mm (1.5 in)
1915
45.5 mm (1.8 in)
1916
36.8 mm (1.4 in)
1917
30.2 mm (1.2 in)
1918
37.3 mm (1.5 in)
1919
61.0 mm (2.4 in)
1920
34.3 mm (1.4 in)
1921
86.4 mm (3.4 in)
1922
36.8 mm (1.4 in)
1923
40.4 mm (1.6 in)
1924
47.8 mm (1.9 in)
1925
29.5 mm (1.2 in)
1926
26.7 mm (1.1 in)
1927
45.7 mm (1.8 in)
1928
27.7 mm (1.1 in)
1929
36.3 mm (1.4 in)
1930
27.2 mm (1.1 in)
1931
39.6 mm (1.6 in)
1932
36.6 mm (1.4 in)
1933
58.2 mm (2.3 in)
1934
40.9 mm (1.6 in)
1935
58.9 mm (2.3 in)
1936
40.1 mm (1.6 in)
1937
72.1 mm (2.8 in)
1938
21.1 mm (0.8 in)
1939
37.3 mm (1.5 in)
1940
29.2 mm (1.1 in)
1941
46.5 mm (1.8 in)
1942
44.5 mm (1.8 in)
1943
49.5 mm (1.9 in)
1944
20.1 mm (0.8 in)
1945
24.9 mm (1.0 in)
1946
48.0 mm (1.9 in)
1947
48.8 mm (1.9 in)
1948
51.3 mm (2.0 in)
1949
48.0 mm (1.9 in)
1950
54.1 mm (2.1 in)
1951
49.5 mm (1.9 in)
1952
27.4 mm (1.1 in)
1953
43.2 mm (1.7 in)
1954
55.4 mm (2.2 in)
1955
56.4 mm (2.2 in)
1956
27.2 mm (1.1 in)
1957
29.0 mm (1.1 in)
1958
42.4 mm (1.7 in)
1959
65.0 mm (2.6 in)
1960
48.3 mm (1.9 in)
1961
38.4 mm (1.5 in)
1962
35.3 mm (1.4 in)
1963
34.3 mm (1.4 in)
1964
32.8 mm (1.3 in)
1965
44.5 mm (1.8 in)
1966
44.2 mm (1.7 in)
1967
62.0 mm (2.4 in)
1968
40.4 mm (1.6 in)
1969
39.6 mm (1.6 in)
1970
33.3 mm (1.3 in)
1971
41.7 mm (1.6 in)
1972
50.5 mm (2.0 in)
1973
33.5 mm (1.3 in)
1974
42.9 mm (1.7 in)
1975
37.6 mm (1.5 in)
1976
24.9 mm (1.0 in)
1977
39.1 mm (1.5 in)
1978
47.8 mm (1.9 in)
1979
46.0 mm (1.8 in)
1980
34.8 mm (1.4 in)
1981
65.3 mm (2.6 in)
1982
64.5 mm (2.5 in)
1983
43.2 mm (1.7 in)
1984
34.3 mm (1.4 in)
1985
37.6 mm (1.5 in)
1986
107.2 mm (4.2 in)
1987
46.2 mm (1.8 in)
1988
54.1 mm (2.1 in)
1989
32.0 mm (1.3 in)
1990
62.7 mm (2.5 in)
1991
51.1 mm (2.0 in)
1992
40.6 mm (1.6 in)
1993
36.1 mm (1.4 in)
1994
45.0 mm (1.8 in)
1995
44.2 mm (1.7 in)
1996
69.9 mm (2.8 in)
1997
53.3 mm (2.1 in)
1998
40.1 mm (1.6 in)
Wettest five days (Rx5day)
The wettest five days of the year at Seattle Urban Site, 1894 to 1998. The record is 166.2 mm (6.5 in) in 1997, marked on the chart; the median year is 88.5 mm (3.5 in).
Wettest five days (Rx5day) at Seattle Urban Site by year
Year
Wettest five days (Rx5day)
1894
99.6 mm (3.9 in)
1895
80.7 mm (3.2 in)
1896
110.5 mm (4.4 in)
1897
129.8 mm (5.1 in)
1898
75.5 mm (3.0 in)
1899
77.0 mm (3.0 in)
1900
85.6 mm (3.4 in)
1901
59.0 mm (2.3 in)
1902
105.1 mm (4.1 in)
1903
112.4 mm (4.4 in)
1904
130.3 mm (5.1 in)
1905
83.9 mm (3.3 in)
1906
93.1 mm (3.7 in)
1907
63.0 mm (2.5 in)
1908
68.5 mm (2.7 in)
1909
77.9 mm (3.1 in)
1910
96.6 mm (3.8 in)
1911
58.9 mm (2.3 in)
1912
71.4 mm (2.8 in)
1913
61.5 mm (2.4 in)
1914
128.8 mm (5.1 in)
1915
75.4 mm (3.0 in)
1916
89.7 mm (3.5 in)
1917
74.7 mm (2.9 in)
1918
63.2 mm (2.5 in)
1919
111.9 mm (4.4 in)
1920
81.3 mm (3.2 in)
1921
149.4 mm (5.9 in)
1922
78.9 mm (3.1 in)
1923
81.2 mm (3.2 in)
1924
72.5 mm (2.9 in)
1925
78.3 mm (3.1 in)
1926
59.4 mm (2.3 in)
1927
54.6 mm (2.1 in)
1928
69.4 mm (2.7 in)
1929
78.0 mm (3.1 in)
1930
43.7 mm (1.7 in)
1931
75.0 mm (3.0 in)
1932
100.6 mm (4.0 in)
1933
159.8 mm (6.3 in)
1934
91.2 mm (3.6 in)
1935
143.7 mm (5.7 in)
1936
85.6 mm (3.4 in)
1937
162.9 mm (6.4 in)
1938
58.5 mm (2.3 in)
1939
92.4 mm (3.6 in)
1940
78.2 mm (3.1 in)
1941
87.6 mm (3.4 in)
1942
88.7 mm (3.5 in)
1943
91.7 mm (3.6 in)
1944
51.3 mm (2.0 in)
1945
59.5 mm (2.3 in)
1946
88.5 mm (3.5 in)
1947
114.1 mm (4.5 in)
1948
67.0 mm (2.6 in)
1949
74.7 mm (2.9 in)
1950
98.9 mm (3.9 in)
1951
113.8 mm (4.5 in)
1952
48.9 mm (1.9 in)
1953
108.2 mm (4.3 in)
1954
95.7 mm (3.8 in)
1955
104.4 mm (4.1 in)
1956
101.9 mm (4.0 in)
1957
102.5 mm (4.0 in)
1958
74.2 mm (2.9 in)
1959
109.3 mm (4.3 in)
1960
105.9 mm (4.2 in)
1961
79.6 mm (3.1 in)
1962
69.9 mm (2.8 in)
1963
81.0 mm (3.2 in)
1964
78.5 mm (3.1 in)
1965
85.1 mm (3.4 in)
1966
87.6 mm (3.4 in)
1967
91.0 mm (3.6 in)
1968
75.5 mm (3.0 in)
1969
77.5 mm (3.1 in)
1970
90.0 mm (3.5 in)
1971
60.5 mm (2.4 in)
1972
92.8 mm (3.7 in)
1973
95.9 mm (3.8 in)
1974
121.6 mm (4.8 in)
1975
86.4 mm (3.4 in)
1976
57.8 mm (2.3 in)
1977
121.9 mm (4.8 in)
1978
73.1 mm (2.9 in)
1979
117.9 mm (4.6 in)
1980
65.3 mm (2.6 in)
1981
113.1 mm (4.5 in)
1982
89.6 mm (3.5 in)
1983
101.4 mm (4.0 in)
1984
72.9 mm (2.9 in)
1985
94.3 mm (3.7 in)
1986
145.6 mm (5.7 in)
1987
95.0 mm (3.7 in)
1988
75.9 mm (3.0 in)
1989
90.2 mm (3.6 in)
1990
128.8 mm (5.1 in)
1991
106.7 mm (4.2 in)
1992
111.5 mm (4.4 in)
1993
89.2 mm (3.5 in)
1994
113.6 mm (4.5 in)
1995
98.1 mm (3.9 in)
1996
136.6 mm (5.4 in)
1997
166.2 mm (6.5 in)
1998
68.3 mm (2.7 in)
Longest dry spell (CDD)
The longest dry spell of the year at Seattle Urban Site, 1894 to 1998. The record is 77 days in 1922, marked on the chart; the median year is 31 days.
Longest dry spell (CDD) at Seattle Urban Site by year
Year
Longest dry spell (CDD)
1894
38 days
1895
39 days
1896
51 days
1897
44 days
1898
31 days
1899
17 days
1900
42 days
1901
34 days
1902
18 days
1903
30 days
1904
52 days
1905
31 days
1906
32 days
1907
26 days
1908
32 days
1909
45 days
1910
44 days
1911
42 days
1912
22 days
1913
30 days
1914
74 days
1915
32 days
1916
31 days
1917
69 days
1918
38 days
1919
30 days
1920
42 days
1921
43 days
1922
77 days
1923
29 days
1924
28 days
1925
31 days
1926
63 days
1927
37 days
1928
68 days
1929
41 days
1930
41 days
1931
42 days
1932
27 days
1933
24 days
1934
29 days
1935
22 days
1936
43 days
1937
22 days
1938
35 days
1939
24 days
1940
43 days
1941
24 days
1942
39 days
1943
24 days
1944
31 days
1945
34 days
1946
47 days
1947
31 days
1948
13 days
1949
20 days
1950
27 days
1951
52 days
1952
43 days
1953
18 days
1954
26 days
1955
43 days
1956
37 days
1957
26 days
1958
63 days
1959
26 days
1960
50 days
1961
55 days
1962
26 days
1963
27 days
1964
16 days
1965
23 days
1966
33 days
1967
71 days
1968
25 days
1969
28 days
1970
25 days
1971
43 days
1972
32 days
1973
18 days
1974
32 days
1975
33 days
1976
14 days
1977
37 days
1978
18 days
1979
35 days
1980
14 days
1981
30 days
1982
30 days
1983
16 days
1984
25 days
1985
31 days
1986
42 days
1987
29 days
1988
33 days
1989
25 days
1990
43 days
1991
44 days
1992
25 days
1993
42 days
1994
34 days
1995
23 days
1996
25 days
1997
26 days
1998
6 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
92 years with a frost
Across 92 years with a frost, the median last spring frost at Seattle Urban Site falls on 4 March and the median first autumn frost on 23 November, which leaves a median of 266 days between them.
In 1963 to 1997 the median growing season was 268 days. That is 15 days more than in 1894 to 1923.
Fitted over all years, the growing season changes by +1.2 days per decade at this station.
Frost dates and growing season at Seattle Urban Site
Measure
Median, all years
Earliest period (1894 to 1923)
Recent period (1963 to 1997)
Recent against earliest
Fitted trend
Last spring frost
4 March
21 March
3 March
18 days earlier
-1.6 days per decade
First autumn frost
23 November
24 November
20 November
4 days earlier
-0.3 days per decade
Growing days
266 days
253 days
268 days
15 days more
+1.2 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
103 years, 1894 to 1997
A day with at least 42.0 mm (1.7 in) of rain is expected about once in 2 years. A day with at least 87.6 mm (3.4 in) of rain is expected about once in 100 years.
Rainfall return levels at Seattle Urban Site: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
42.0 mm (1.7 in)
5 years
54.3 mm (2.1 in)
10 years
62.4 mm (2.5 in)
25 years
72.6 mm (2.9 in)
50 years
80.2 mm (3.2 in)
100 years
87.6 mm (3.4 in)
The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 103 years of values from 1894 to 1997.
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: 107.2 mm (4.2 in) in 1986; 86.4 mm (3.4 in) in 1921; 73.4 mm (2.9 in) in 1897.
Station Changes
3 suspected
3 changes were suspected in the annual mean temperature of Seattle Urban Site, at 1920, 1934 and 1957. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1920 ran 0.3 C (0.5 F) lower than in the years before (likely change).
Relative to 5 neighbouring stations, the station's annual mean temperature from 1934 ran 0.4 C (0.7 F) higher than in the years before (likely change).
Relative to 5 neighbouring stations, the station's annual mean temperature from 1957 ran 0.2 C (0.3 F) higher than in the years before (possible change).
Suspected changes in the annual mean temperature at Seattle Urban Site, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1920
-0.3
-0.5
likely
5
1934
+0.4
+0.7
likely
5
1957
+0.2
+0.3
possible
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.
Download the Data
Data for Seattle Urban Site standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Seattle Urban 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 2026-10-12 (12 October 2026). Records are computed by this site and are not official.