Record envelope, standing records and threshold days for Kosmos (USC00454286), Washington, United States, with 61 years of record.
Key Facts for Kosmos
Kosmos (USC00454286) is a weather station in Washington, United States at 46.50 latitude and -122.18 longitude, 238 m (781 ft) above sea level.
The station reports from 1905 to 1965, 61 years of record.
1,464 records set at Kosmos still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Kosmos set a daily record high maximum temperature of 25.6 C (78.1 F) on 25 October 1965.
About the Station
Location: Washington, United States, 46.50 latitude, -122.18 longitude.
Elevation: 238 m (781 ft).
Period of record: 1905 to 1965, 61 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 Kosmos. 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 Kosmos, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
22.2 C (72.0 F)
-23.9 C (-11.0 F)
n/a
n/a
Feb
23.3 C (73.9 F)
-17.8 C (0.0 F)
n/a
n/a
Mar
28.3 C (82.9 F)
-12.8 C (9.0 F)
n/a
n/a
Apr
34.4 C (93.9 F)
-6.7 C (19.9 F)
n/a
n/a
May
37.8 C (100.0 F)
-5.0 C (23.0 F)
n/a
n/a
Jun
39.4 C (102.9 F)
-1.7 C (28.9 F)
n/a
n/a
Jul
40.6 C (105.1 F)
0.0 C (32.0 F)
n/a
n/a
Aug
40.6 C (105.1 F)
-1.7 C (28.9 F)
n/a
n/a
Sep
38.9 C (102.0 F)
-4.4 C (24.1 F)
n/a
n/a
Oct
35.0 C (95.0 F)
-8.3 C (17.1 F)
n/a
n/a
Nov
28.3 C (82.9 F)
-17.2 C (1.0 F)
n/a
n/a
Dec
17.2 C (63.0 F)
-21.1 C (-6.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Kosmos still stand. 1919 holds the most, with 56.
Standing records at Kosmos by the year they were set
Year set
Standing records
1905
4
1906
31
1907
14
1908
29
1909
45
1910
21
1911
32
1912
17
1913
23
1914
38
1915
15
1916
45
1917
18
1918
29
1919
56
1920
31
1921
49
1922
19
1923
6
1925
9
1926
2
1927
3
1928
15
1932
10
1933
25
1934
39
1935
48
1936
43
1937
31
1938
24
1939
28
1940
32
1941
33
1942
21
1943
19
1944
30
1945
19
1946
14
1947
30
1948
35
1949
50
1950
29
1951
25
1952
31
1953
16
1954
24
1955
36
1956
32
1957
18
1958
25
1959
12
1960
19
1961
29
1962
21
1963
21
1964
15
1965
29
All-Time Record Progression
4 new records
4 all-time records were set at Kosmos between 25 January 1950 and 31 January 1950. Each dot is a new record.
When Kosmos set new all-time records
Date
Kind
Detail
1950-01-25
Record low maximum temperature
Record low maximum temperature -6.7 C (19.9 F)
1950-01-25
Record low minimum temperature
Record low minimum temperature -23.3 C (-9.9 F)
1950-01-31
Record low maximum temperature
Record low maximum temperature -7.2 C (19.0 F)
1950-01-31
Record low minimum temperature
Record low minimum temperature -23.9 C (-11.0 F)
Wettest Day of Each Month
Dec: 102.1 mm (4.0 in)
The wettest day on record for each calendar month at Kosmos. The most was 102.1 mm (4.0 in) on 9 December 1933.
Record daily precipitation for each month at Kosmos
Month
Record daily precipitation (mm)
Date
Jan
69.1 mm (2.7 in)
22 January 1935
Feb
64.0 mm (2.5 in)
5 February 1907
Mar
97.0 mm (3.8 in)
1 March 1910
Apr
50.0 mm (2.0 in)
6 April 1962
May
41.9 mm (1.6 in)
1 May 1949
Jun
60.2 mm (2.4 in)
8 June 1933
Jul
53.8 mm (2.1 in)
2 July 1916
Aug
52.3 mm (2.1 in)
16 August 1912
Sep
43.9 mm (1.7 in)
4 September 1945
Oct
80.8 mm (3.2 in)
30 October 1919
Nov
98.8 mm (3.9 in)
27 November 1917
Dec
102.1 mm (4.0 in)
9 December 1933
Period of Record Coverage
1905 to 1965
Complete yearUnder 90 percent of days
58 years of record at Kosmos, 1905 to 1965. 14 years have data for under 90 percent of days and are left out of rankings: 1905, 1915, 1917, 1920, 1921, 1922, 1923, 1925 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 35 complete years at Kosmos, 1906 to 1964. Blue stripes are years cooler than the station's own mean of 9.9 C (49.8 F); red stripes are warmer. The coolest year was 1955, at 8.4 C (47.2 F), and the warmest was 1914, at 11.7 C (53.0 F). The strongest colour marks a difference of 1.8 C (3.2 F).
Annual mean temperature at Kosmos as warming stripes, 1906 to 1964
Year
Annual mean temperature
Difference from the station mean
1906
11.2 C
+1.33 C
1908
10.5 C
+0.61 C
1909
9.2 C
-0.72 C
1911
9.4 C
-0.55 C
1913
9.8 C
-0.07 C
1914
11.7 C
+1.77 C
1933
9.5 C
-0.39 C
1934
11.5 C
+1.57 C
1935
9.4 C
-0.50 C
1936
9.7 C
-0.16 C
1937
9.1 C
-0.77 C
1938
9.7 C
-0.16 C
1939
10.2 C
+0.27 C
1940
11.3 C
+1.41 C
1942
10.4 C
+0.49 C
1943
9.4 C
-0.49 C
1944
10.2 C
+0.26 C
1945
9.5 C
-0.44 C
1946
9.4 C
-0.55 C
1947
10.0 C
+0.08 C
1949
8.8 C
-1.09 C
1950
9.2 C
-0.68 C
1951
9.7 C
-0.22 C
1952
9.8 C
-0.12 C
1953
9.9 C
+0.04 C
1954
9.7 C
-0.23 C
1955
8.4 C
-1.48 C
1956
9.4 C
-0.52 C
1957
9.7 C
-0.24 C
1958
11.6 C
+1.73 C
1959
9.9 C
+0.02 C
1961
10.6 C
+0.65 C
1962
9.6 C
-0.27 C
1963
9.9 C
+0.04 C
1964
9.2 C
-0.72 C
The fitted trend in annual mean temperature here over 1906 to 1964 is -0.11 C (-0.27 to 0.05) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.2 F (-0.5 to 0.1) per decade. The slope is a straight line fitted to 35 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Kosmos
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.11 C (-0.27 to 0.05) per decade
-0.2 F (-0.5 to 0.1) per decade
1906 to 1964
35
Not clearly different from zero
Mean daily maximum
-0.1 C (-0.3 to 0.1) per decade
-0.3 F (-0.6 to 0.1) per decade
1906 to 1964
35
Not clearly different from zero
Mean daily minimum
-0.1 C (-0.3 to 0.1) per decade
-0.1 F (-0.5 to 0.2) per decade
1906 to 1964
35
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
1905 to 1965
Yearly extremes at Kosmos: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
40.6 C (105.1 F)
1933
37.0 C (98.5 F)
58
Coldest night (TNn)
-23.9 C (-11.0 F)
1950
-11.4 C (11.5 F)
58
Wettest day (Rx1day)
102.1 mm (4.0 in)
1933
55.6 mm (2.2 in)
58
Wettest five days (Rx5day)
251.4 mm (9.9 in)
1933
130.7 mm (5.1 in)
58
Longest dry spell (CDD)
53 days
1958
26 days
58
Hottest day (TXx)
The hottest day of the year at Kosmos, 1905 to 1965. The record is 40.6 C (105.1 F) in 1933, marked on the chart; the median year is 37.0 C (98.5 F).
Hottest day (TXx) at Kosmos by year
Year
Hottest day (TXx)
1905
23.3 C (73.9 F)
1906
40.0 C (104.0 F)
1907
40.0 C (104.0 F)
1908
38.3 C (100.9 F)
1909
36.1 C (97.0 F)
1910
36.1 C (97.0 F)
1911
37.8 C (100.0 F)
1912
36.7 C (98.1 F)
1913
37.2 C (99.0 F)
1914
37.2 C (99.0 F)
1915
37.8 C (100.0 F)
1916
36.7 C (98.1 F)
1917
35.6 C (96.1 F)
1918
36.1 C (97.0 F)
1919
38.3 C (100.9 F)
1920
38.3 C (100.9 F)
1921
33.9 C (93.0 F)
1922
37.8 C (100.0 F)
1923
36.1 C (97.0 F)
1925
36.7 C (98.1 F)
1926
18.3 C (64.9 F)
1927
16.7 C (62.1 F)
1928
37.8 C (100.0 F)
1930
28.3 C (82.9 F)
1932
36.1 C (97.0 F)
1933
40.6 C (105.1 F)
1934
38.3 C (100.9 F)
1935
38.3 C (100.9 F)
1936
37.2 C (99.0 F)
1937
36.1 C (97.0 F)
1938
40.6 C (105.1 F)
1939
37.2 C (99.0 F)
1940
37.8 C (100.0 F)
1941
40.0 C (104.0 F)
1942
40.6 C (105.1 F)
1943
35.6 C (96.1 F)
1944
38.9 C (102.0 F)
1945
37.2 C (99.0 F)
1946
40.0 C (104.0 F)
1947
34.4 C (93.9 F)
1948
35.6 C (96.1 F)
1949
36.1 C (97.0 F)
1950
35.6 C (96.1 F)
1951
36.7 C (98.1 F)
1952
38.3 C (100.9 F)
1953
35.6 C (96.1 F)
1954
30.6 C (87.1 F)
1955
36.7 C (98.1 F)
1956
40.6 C (105.1 F)
1957
34.4 C (93.9 F)
1958
38.9 C (102.0 F)
1959
36.7 C (98.1 F)
1960
38.9 C (102.0 F)
1961
38.9 C (102.0 F)
1962
33.9 C (93.0 F)
1963
35.0 C (95.0 F)
1964
33.3 C (91.9 F)
1965
38.3 C (100.9 F)
Coldest night (TNn)
The coldest night of the year at Kosmos, 1905 to 1965. The record is -23.9 C (-11.0 F) in 1950, marked on the chart; the median year is -11.4 C (11.5 F).
Coldest night (TNn) at Kosmos by year
Year
Coldest night (TNn)
1905
-3.9 C (25.0 F)
1906
-8.9 C (16.0 F)
1907
-14.4 C (6.1 F)
1908
-16.1 C (3.0 F)
1909
-16.1 C (3.0 F)
1910
-12.8 C (9.0 F)
1911
-13.9 C (7.0 F)
1912
-12.8 C (9.0 F)
1913
-10.6 C (12.9 F)
1914
-11.7 C (10.9 F)
1915
-11.7 C (10.9 F)
1916
-16.7 C (1.9 F)
1917
-11.7 C (10.9 F)
1918
-9.4 C (15.1 F)
1919
-21.1 C (-6.0 F)
1920
-8.3 C (17.1 F)
1921
-8.3 C (17.1 F)
1922
-20.0 C (-4.0 F)
1923
-12.8 C (9.0 F)
1925
-6.7 C (19.9 F)
1926
-6.7 C (19.9 F)
1927
-8.3 C (17.1 F)
1928
-3.9 C (25.0 F)
1930
-2.8 C (27.0 F)
1932
-16.7 C (1.9 F)
1933
-13.3 C (8.1 F)
1934
-3.9 C (25.0 F)
1935
-13.3 C (8.1 F)
1936
-11.1 C (12.0 F)
1937
-19.4 C (-2.9 F)
1938
-8.9 C (16.0 F)
1939
-7.2 C (19.0 F)
1940
-8.3 C (17.1 F)
1941
-6.7 C (19.9 F)
1942
-11.1 C (12.0 F)
1943
-17.8 C (0.0 F)
1944
-10.6 C (12.9 F)
1945
-8.3 C (17.1 F)
1946
-8.9 C (16.0 F)
1947
-17.2 C (1.0 F)
1948
-10.6 C (12.9 F)
1949
-18.3 C (-0.9 F)
1950
-23.9 C (-11.0 F)
1951
-11.1 C (12.0 F)
1952
-14.4 C (6.1 F)
1953
-6.1 C (21.0 F)
1954
-8.9 C (16.0 F)
1955
-17.2 C (1.0 F)
1956
-16.1 C (3.0 F)
1957
-20.6 C (-5.1 F)
1958
-7.2 C (19.0 F)
1959
-14.4 C (6.1 F)
1960
-9.4 C (15.1 F)
1961
-10.6 C (12.9 F)
1962
-15.6 C (3.9 F)
1963
-13.9 C (7.0 F)
1964
-13.3 C (8.1 F)
1965
-7.8 C (18.0 F)
Wettest day (Rx1day)
The wettest day of the year at Kosmos, 1905 to 1965. The record is 102.1 mm (4.0 in) in 1933, marked on the chart; the median year is 55.6 mm (2.2 in).
Wettest day (Rx1day) at Kosmos by year
Year
Wettest day (Rx1day)
1905
28.2 mm (1.1 in)
1906
75.2 mm (3.0 in)
1907
64.0 mm (2.5 in)
1908
83.6 mm (3.3 in)
1909
59.2 mm (2.3 in)
1910
97.0 mm (3.8 in)
1911
47.0 mm (1.9 in)
1912
69.1 mm (2.7 in)
1913
55.9 mm (2.2 in)
1914
58.7 mm (2.3 in)
1915
65.8 mm (2.6 in)
1916
53.8 mm (2.1 in)
1917
98.8 mm (3.9 in)
1918
47.5 mm (1.9 in)
1919
80.8 mm (3.2 in)
1920
38.4 mm (1.5 in)
1921
38.4 mm (1.5 in)
1922
25.9 mm (1.0 in)
1923
50.5 mm (2.0 in)
1925
50.0 mm (2.0 in)
1926
36.3 mm (1.4 in)
1927
29.2 mm (1.1 in)
1928
41.9 mm (1.6 in)
1930
47.5 mm (1.9 in)
1932
55.6 mm (2.2 in)
1933
102.1 mm (4.0 in)
1934
70.9 mm (2.8 in)
1935
69.1 mm (2.7 in)
1936
67.8 mm (2.7 in)
1937
63.0 mm (2.5 in)
1938
56.6 mm (2.2 in)
1939
47.2 mm (1.9 in)
1940
45.2 mm (1.8 in)
1941
74.9 mm (2.9 in)
1942
70.6 mm (2.8 in)
1943
48.0 mm (1.9 in)
1944
42.7 mm (1.7 in)
1945
55.6 mm (2.2 in)
1946
84.6 mm (3.3 in)
1947
40.9 mm (1.6 in)
1948
55.4 mm (2.2 in)
1949
49.5 mm (1.9 in)
1950
60.7 mm (2.4 in)
1951
65.3 mm (2.6 in)
1952
43.4 mm (1.7 in)
1953
46.5 mm (1.8 in)
1954
53.6 mm (2.1 in)
1955
60.2 mm (2.4 in)
1956
50.3 mm (2.0 in)
1957
52.3 mm (2.1 in)
1958
54.9 mm (2.2 in)
1959
80.5 mm (3.2 in)
1960
60.2 mm (2.4 in)
1961
51.8 mm (2.0 in)
1962
85.6 mm (3.4 in)
1963
58.2 mm (2.3 in)
1964
72.6 mm (2.9 in)
1965
48.5 mm (1.9 in)
Wettest five days (Rx5day)
The wettest five days of the year at Kosmos, 1905 to 1965. The record is 251.4 mm (9.9 in) in 1933, marked on the chart; the median year is 130.7 mm (5.1 in).
Wettest five days (Rx5day) at Kosmos by year
Year
Wettest five days (Rx5day)
1905
67.7 mm (2.7 in)
1906
218.1 mm (8.6 in)
1907
113.8 mm (4.5 in)
1908
180.7 mm (7.1 in)
1909
155.3 mm (6.1 in)
1910
206.5 mm (8.1 in)
1911
113.1 mm (4.5 in)
1912
114.8 mm (4.5 in)
1913
115.4 mm (4.5 in)
1914
148.5 mm (5.8 in)
1915
117.6 mm (4.6 in)
1916
122.0 mm (4.8 in)
1917
209.1 mm (8.2 in)
1918
110.8 mm (4.4 in)
1919
167.4 mm (6.6 in)
1920
107.0 mm (4.2 in)
1921
134.8 mm (5.3 in)
1922
88.4 mm (3.5 in)
1923
158.7 mm (6.2 in)
1925
83.6 mm (3.3 in)
1926
94.0 mm (3.7 in)
1927
62.2 mm (2.4 in)
1928
127.2 mm (5.0 in)
1930
73.4 mm (2.9 in)
1932
144.8 mm (5.7 in)
1933
251.4 mm (9.9 in)
1934
175.5 mm (6.9 in)
1935
115.9 mm (4.6 in)
1936
110.0 mm (4.3 in)
1937
182.6 mm (7.2 in)
1938
112.8 mm (4.4 in)
1939
136.6 mm (5.4 in)
1940
141.6 mm (5.6 in)
1941
170.5 mm (6.7 in)
1942
132.0 mm (5.2 in)
1943
125.5 mm (4.9 in)
1944
78.5 mm (3.1 in)
1945
124.6 mm (4.9 in)
1946
239.8 mm (9.4 in)
1947
124.2 mm (4.9 in)
1948
129.3 mm (5.1 in)
1949
122.4 mm (4.8 in)
1950
138.4 mm (5.4 in)
1951
132.6 mm (5.2 in)
1952
75.5 mm (3.0 in)
1953
153.4 mm (6.0 in)
1954
114.1 mm (4.5 in)
1955
135.7 mm (5.3 in)
1956
128.4 mm (5.1 in)
1957
99.6 mm (3.9 in)
1958
151.5 mm (6.0 in)
1959
185.2 mm (7.3 in)
1960
143.6 mm (5.7 in)
1961
109.2 mm (4.3 in)
1962
139.4 mm (5.5 in)
1963
141.7 mm (5.6 in)
1964
196.3 mm (7.7 in)
1965
176.3 mm (6.9 in)
Longest dry spell (CDD)
The longest dry spell of the year at Kosmos, 1905 to 1965. The record is 53 days in 1958, marked on the chart; the median year is 26 days.
Longest dry spell (CDD) at Kosmos by year
Year
Longest dry spell (CDD)
1905
6 days
1906
22 days
1907
26 days
1908
22 days
1909
33 days
1910
43 days
1911
31 days
1912
23 days
1913
32 days
1914
30 days
1915
30 days
1916
19 days
1917
39 days
1918
19 days
1919
38 days
1920
38 days
1921
46 days
1922
38 days
1923
6 days
1925
17 days
1926
7 days
1927
10 days
1928
24 days
1930
8 days
1932
14 days
1933
27 days
1934
33 days
1935
19 days
1936
43 days
1937
24 days
1938
30 days
1939
36 days
1940
43 days
1941
21 days
1942
24 days
1943
23 days
1944
48 days
1945
34 days
1946
23 days
1947
25 days
1948
13 days
1949
17 days
1950
30 days
1951
52 days
1952
37 days
1953
21 days
1954
13 days
1955
45 days
1956
22 days
1957
26 days
1958
53 days
1959
20 days
1960
35 days
1961
38 days
1962
27 days
1963
17 days
1964
14 days
1965
24 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
35 years with a frost
Across 35 years with a frost, the median last spring frost at Kosmos falls on 13 May and the median first autumn frost on 27 September, which leaves a median of 139 days between them.
Fitted over all years, the growing season changes by -2.5 days per decade at this station.
Frost dates and growing season at Kosmos
Measure
Median, all years
Earliest period
Recent period (1914 to 1964)
Recent against earliest
Fitted trend
Last spring frost
13 May
n/a
15 May
n/a
+0.6 days per decade
First autumn frost
27 September
n/a
28 September
n/a
-1.9 days per decade
Growing days
139 days
n/a
136 days
n/a
-2.5 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
42 years, 1909 to 1965
A day with at least 57.7 mm (2.3 in) of rain is expected about once in 2 years. A day with at least 113.7 mm (4.5 in) of rain is expected about once in 100 years.
Rainfall return levels at Kosmos: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
57.7 mm (2.3 in)
5 years
70.8 mm (2.8 in)
10 years
80.2 mm (3.2 in)
25 years
92.9 mm (3.7 in)
50 years
103.0 mm (4.1 in)
Longer than the 42 years of record
100 years
113.7 mm (4.5 in)
Longer than the 42 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, 42 years of values from 1909 to 1965.
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: 102.1 mm (4.0 in) in 1933; 97.0 mm (3.8 in) in 1910; 85.6 mm (3.4 in) in 1962.
Download the Data
Data for Kosmos standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Kosmos 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.