Record envelope, standing records and threshold days for Seattle NAS (USW00024244), Washington, United States, with 42 years of record.
Key Facts for Seattle NAS
Seattle NAS (USW00024244) is a weather station in Washington, United States at 47.68 latitude and -122.27 longitude, 15 m (49 ft) above sea level.
The station reports from 1929 to 1970, 42 years of record.
1,464 records set at Seattle NAS still stand.
Records are tracked for prcp: an element needs 30 years of data to be eligible.
Seattle NAS set a daily record precipitation of 14.0 mm (0.6 in) on 9 April 1970.
About the Station
Location: Washington, United States, 47.68 latitude, -122.27 longitude.
Elevation: 15 m (49 ft).
Period of record: 1929 to 1970, 42 years.
Eligible elements: prcp.
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 NAS. 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 NAS, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
20.0 C (68.0 F)
-12.8 C (9.0 F)
n/a
n/a
Feb
21.1 C (70.0 F)
-12.2 C (10.0 F)
n/a
n/a
Mar
22.2 C (72.0 F)
-6.7 C (19.9 F)
n/a
n/a
Apr
30.0 C (86.0 F)
-1.1 C (30.0 F)
n/a
n/a
May
35.0 C (95.0 F)
-1.1 C (30.0 F)
n/a
n/a
Jun
35.0 C (95.0 F)
6.7 C (44.1 F)
n/a
n/a
Jul
35.0 C (95.0 F)
6.1 C (43.0 F)
n/a
n/a
Aug
36.7 C (98.1 F)
8.3 C (46.9 F)
n/a
n/a
Sep
34.4 C (93.9 F)
3.3 C (37.9 F)
n/a
n/a
Oct
28.3 C (82.9 F)
-0.6 C (30.9 F)
n/a
n/a
Nov
18.9 C (66.0 F)
-10.0 C (14.0 F)
n/a
n/a
Dec
18.3 C (64.9 F)
-13.3 C (8.1 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Seattle NAS still stand. 1950 holds the most, with 76.
Standing records at Seattle NAS by the year they were set
Year set
Standing records
1929
2
1930
65
1931
27
1932
69
1933
18
1934
17
1936
10
1937
5
1938
28
1939
8
1942
3
1943
9
1945
41
1946
43
1947
44
1948
50
1949
68
1950
76
1951
53
1952
60
1953
51
1954
56
1955
60
1956
50
1957
45
1958
76
1959
29
1960
46
1961
40
1962
43
1963
38
1964
33
1965
49
1966
26
1967
42
1968
41
1969
29
1970
14
Wettest Day of Each Month
Nov: 66.8 mm (2.6 in)
The wettest day on record for each calendar month at Seattle NAS. The most was 66.8 mm (2.6 in) on 20 November 1959.
Record daily precipitation for each month at Seattle NAS
Month
Record daily precipitation (mm)
Date
Jan
64.8 mm (2.6 in)
20 January 1935
Feb
49.8 mm (2.0 in)
16 February 1949
Mar
49.5 mm (1.9 in)
3 March 1950
Apr
48.3 mm (1.9 in)
19 April 1965
May
45.2 mm (1.8 in)
29 May 1969
Jun
46.0 mm (1.8 in)
30 June 1935
Jul
30.7 mm (1.2 in)
1 July 1954
Aug
29.2 mm (1.1 in)
26 August 1960
Sep
38.9 mm (1.5 in)
26 September 1948
Oct
53.8 mm (2.1 in)
9 October 1950
Nov
66.8 mm (2.6 in)
20 November 1959
Dec
47.0 mm (1.9 in)
27 December 1937
Period of Record Coverage
1929 to 1970
Complete yearUnder 90 percent of days
38 years of record at Seattle NAS, 1929 to 1970. 14 years have data for under 90 percent of days and are left out of rankings: 1929, 1930, 1931, 1932, 1933, 1934, 1936, 1937 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 24 complete years at Seattle NAS, 1946 to 1969. Blue stripes are years cooler than the station's own mean of 11.4 C (52.4 F); red stripes are warmer. The coolest year was 1955, at 10.1 C (50.2 F), and the warmest was 1958, at 13.2 C (55.7 F). The strongest colour marks a difference of 1.9 C (3.4 F).
Annual mean temperature at Seattle NAS as warming stripes, 1946 to 1969
Year
Annual mean temperature
Difference from the station mean
1946
11.2 C
-0.18 C
1947
11.8 C
+0.44 C
1948
10.5 C
-0.85 C
1949
10.8 C
-0.55 C
1950
10.5 C
-0.86 C
1951
11.3 C
-0.03 C
1952
11.6 C
+0.25 C
1953
12.0 C
+0.63 C
1954
11.0 C
-0.36 C
1955
10.1 C
-1.25 C
1956
11.1 C
-0.27 C
1957
11.6 C
+0.22 C
1958
13.2 C
+1.82 C
1959
11.3 C
-0.08 C
1960
11.2 C
-0.12 C
1961
11.8 C
+0.47 C
1962
11.4 C
+0.07 C
1963
11.6 C
+0.28 C
1964
10.5 C
-0.83 C
1965
11.5 C
+0.14 C
1966
11.6 C
+0.25 C
1967
12.1 C
+0.76 C
1968
11.3 C
-0.03 C
1969
11.4 C
+0.03 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
1929 to 1970
Yearly extremes at Seattle NAS: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
36.7 C (98.1 F)
1960
31.7 C (89.1 F)
38
Coldest night (TNn)
-13.3 C (8.1 F)
1968
-4.7 C (23.5 F)
38
Wettest day (Rx1day)
66.8 mm (2.6 in)
1959
39.2 mm (1.5 in)
42
Wettest five days (Rx5day)
161.6 mm (6.4 in)
1935
78.4 mm (3.1 in)
42
Longest dry spell (CDD)
55 days
1960
28 days
42
Hottest day (TXx)
The hottest day of the year at Seattle NAS, 1929 to 1970. The record is 36.7 C (98.1 F) in 1960, marked on the chart; the median year is 31.7 C (89.1 F).
Hottest day (TXx) at Seattle NAS by year
Year
Hottest day (TXx)
1929
15.6 C (60.1 F)
1930
31.1 C (88.0 F)
1931
28.3 C (82.9 F)
1932
30.0 C (86.0 F)
1933
32.2 C (90.0 F)
1934
30.0 C (86.0 F)
1935
n/a
1936
26.7 C (80.1 F)
1937
21.7 C (71.1 F)
1938
30.0 C (86.0 F)
1939
28.3 C (82.9 F)
1940
n/a
1941
n/a
1942
15.0 C (59.0 F)
1943
24.4 C (75.9 F)
1944
n/a
1945
31.7 C (89.1 F)
1946
32.2 C (90.0 F)
1947
30.0 C (86.0 F)
1948
30.6 C (87.1 F)
1949
32.8 C (91.0 F)
1950
31.1 C (88.0 F)
1951
33.3 C (91.9 F)
1952
33.9 C (93.0 F)
1953
33.9 C (93.0 F)
1954
28.3 C (82.9 F)
1955
35.0 C (95.0 F)
1956
33.9 C (93.0 F)
1957
30.6 C (87.1 F)
1958
35.0 C (95.0 F)
1959
33.3 C (91.9 F)
1960
36.7 C (98.1 F)
1961
34.4 C (93.9 F)
1962
31.7 C (89.1 F)
1963
35.0 C (95.0 F)
1964
31.1 C (88.0 F)
1965
33.9 C (93.0 F)
1966
32.2 C (90.0 F)
1967
35.0 C (95.0 F)
1968
33.3 C (91.9 F)
1969
33.3 C (91.9 F)
1970
26.7 C (80.1 F)
Coldest night (TNn)
The coldest night of the year at Seattle NAS, 1929 to 1970. The record is -13.3 C (8.1 F) in 1968, marked on the chart; the median year is -4.7 C (23.5 F).
Coldest night (TNn) at Seattle NAS by year
Year
Coldest night (TNn)
1929
0.0 C (32.0 F)
1930
-10.0 C (14.0 F)
1931
-1.1 C (30.0 F)
1932
-9.4 C (15.1 F)
1933
1.1 C (34.0 F)
1934
-0.6 C (30.9 F)
1935
n/a
1936
-0.6 C (30.9 F)
1937
0.6 C (33.1 F)
1938
-3.9 C (25.0 F)
1939
-1.7 C (28.9 F)
1940
n/a
1941
n/a
1942
0.0 C (32.0 F)
1943
-10.6 C (12.9 F)
1944
n/a
1945
-3.3 C (26.1 F)
1946
-3.9 C (25.0 F)
1947
-7.8 C (18.0 F)
1948
-5.0 C (23.0 F)
1949
-8.3 C (17.1 F)
1950
-12.8 C (9.0 F)
1951
-7.8 C (18.0 F)
1952
-6.7 C (19.9 F)
1953
-1.1 C (30.0 F)
1954
-5.6 C (21.9 F)
1955
-10.0 C (14.0 F)
1956
-8.9 C (16.0 F)
1957
-10.6 C (12.9 F)
1958
-2.8 C (27.0 F)
1959
-8.9 C (16.0 F)
1960
-2.8 C (27.0 F)
1961
-2.8 C (27.0 F)
1962
-7.8 C (18.0 F)
1963
-8.3 C (17.1 F)
1964
-12.2 C (10.0 F)
1965
-2.8 C (27.0 F)
1966
-1.7 C (28.9 F)
1967
-3.9 C (25.0 F)
1968
-13.3 C (8.1 F)
1969
-9.4 C (15.1 F)
1970
-4.4 C (24.1 F)
Wettest day (Rx1day)
The wettest day of the year at Seattle NAS, 1929 to 1970. The record is 66.8 mm (2.6 in) in 1959, marked on the chart; the median year is 39.2 mm (1.5 in).
Wettest day (Rx1day) at Seattle NAS by year
Year
Wettest day (Rx1day)
1929
37.6 mm (1.5 in)
1930
21.3 mm (0.8 in)
1931
41.4 mm (1.6 in)
1932
26.7 mm (1.1 in)
1933
56.6 mm (2.2 in)
1934
32.3 mm (1.3 in)
1935
64.8 mm (2.6 in)
1936
36.1 mm (1.4 in)
1937
47.0 mm (1.9 in)
1938
21.8 mm (0.9 in)
1939
33.3 mm (1.3 in)
1940
42.4 mm (1.7 in)
1941
36.3 mm (1.4 in)
1942
32.8 mm (1.3 in)
1943
36.3 mm (1.4 in)
1944
23.1 mm (0.9 in)
1945
38.9 mm (1.5 in)
1946
34.3 mm (1.4 in)
1947
47.0 mm (1.9 in)
1948
43.2 mm (1.7 in)
1949
49.8 mm (2.0 in)
1950
53.8 mm (2.1 in)
1951
48.5 mm (1.9 in)
1952
42.7 mm (1.7 in)
1953
39.4 mm (1.6 in)
1954
41.1 mm (1.6 in)
1955
35.3 mm (1.4 in)
1956
26.7 mm (1.1 in)
1957
27.2 mm (1.1 in)
1958
39.9 mm (1.6 in)
1959
66.8 mm (2.6 in)
1960
40.4 mm (1.6 in)
1961
27.2 mm (1.1 in)
1962
30.7 mm (1.2 in)
1963
31.8 mm (1.3 in)
1964
33.0 mm (1.3 in)
1965
48.3 mm (1.9 in)
1966
44.7 mm (1.8 in)
1967
50.0 mm (2.0 in)
1968
41.7 mm (1.6 in)
1969
45.2 mm (1.8 in)
1970
23.6 mm (0.9 in)
Wettest five days (Rx5day)
The wettest five days of the year at Seattle NAS, 1929 to 1970. The record is 161.6 mm (6.4 in) in 1935, marked on the chart; the median year is 78.4 mm (3.1 in).
Wettest five days (Rx5day) at Seattle NAS by year
Year
Wettest five days (Rx5day)
1929
31.3 mm (1.2 in)
1930
42.2 mm (1.7 in)
1931
76.2 mm (3.0 in)
1932
50.2 mm (2.0 in)
1933
139.7 mm (5.5 in)
1934
82.3 mm (3.2 in)
1935
161.6 mm (6.4 in)
1936
70.7 mm (2.8 in)
1937
128.0 mm (5.0 in)
1938
54.0 mm (2.1 in)
1939
78.8 mm (3.1 in)
1940
80.0 mm (3.1 in)
1941
66.3 mm (2.6 in)
1942
72.7 mm (2.9 in)
1943
78.9 mm (3.1 in)
1944
45.4 mm (1.8 in)
1945
84.7 mm (3.3 in)
1946
73.9 mm (2.9 in)
1947
110.2 mm (4.3 in)
1948
60.0 mm (2.4 in)
1949
92.7 mm (3.6 in)
1950
114.3 mm (4.5 in)
1951
113.5 mm (4.5 in)
1952
58.7 mm (2.3 in)
1953
106.3 mm (4.2 in)
1954
82.2 mm (3.2 in)
1955
93.2 mm (3.7 in)
1956
93.8 mm (3.7 in)
1957
85.1 mm (3.4 in)
1958
73.5 mm (2.9 in)
1959
119.4 mm (4.7 in)
1960
97.1 mm (3.8 in)
1961
64.9 mm (2.6 in)
1962
61.5 mm (2.4 in)
1963
78.0 mm (3.1 in)
1964
64.8 mm (2.6 in)
1965
70.7 mm (2.8 in)
1966
81.1 mm (3.2 in)
1967
70.6 mm (2.8 in)
1968
81.9 mm (3.2 in)
1969
76.2 mm (3.0 in)
1970
50.8 mm (2.0 in)
Longest dry spell (CDD)
The longest dry spell of the year at Seattle NAS, 1929 to 1970. The record is 55 days in 1960, marked on the chart; the median year is 28 days.
Longest dry spell (CDD) at Seattle NAS by year
Year
Longest dry spell (CDD)
1929
17 days
1930
31 days
1931
42 days
1932
4 days
1933
27 days
1934
32 days
1935
16 days
1936
43 days
1937
22 days
1938
12 days
1939
16 days
1940
35 days
1941
26 days
1942
29 days
1943
33 days
1944
18 days
1945
41 days
1946
47 days
1947
32 days
1948
17 days
1949
24 days
1950
20 days
1951
52 days
1952
41 days
1953
28 days
1954
35 days
1955
42 days
1956
27 days
1957
26 days
1958
39 days
1959
33 days
1960
55 days
1961
41 days
1962
28 days
1963
25 days
1964
14 days
1965
25 days
1966
19 days
1967
42 days
1968
24 days
1969
53 days
1970
13 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
22 years with a frost
Across 22 years with a frost, the median last spring frost at Seattle NAS falls on 12 March and the median first autumn frost on 21 November, which leaves a median of 255 days between them.
Frost dates and growing season at Seattle NAS
Measure
Median, all years
Earliest period
Recent period (1946 to 1969)
Recent against earliest
Fitted trend
Last spring frost
12 March
n/a
12 March
n/a
n/a
First autumn frost
21 November
n/a
21 November
n/a
n/a
Growing days
255 days
n/a
255 days
n/a
n/a
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
30 years, 1934 to 1969
A day with at least 38.8 mm (1.5 in) of rain is expected about once in 2 years. A day with at least 64.5 mm (2.5 in) of rain is expected about once in 100 years.
Rainfall return levels at Seattle NAS: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
38.8 mm (1.5 in)
5 years
47.3 mm (1.9 in)
10 years
52.2 mm (2.1 in)
25 years
57.7 mm (2.3 in)
50 years
61.3 mm (2.4 in)
Longer than the 30 years of record
100 years
64.5 mm (2.5 in)
Longer than the 30 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, 30 years of values from 1934 to 1969.
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: 66.8 mm (2.6 in) in 1959; 53.8 mm (2.1 in) in 1950; 50.0 mm (2.0 in) in 1967.
Download the Data
Data for Seattle NAS standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Seattle NAS 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.