Record envelope, standing records and threshold days for Alder Dam Camp (USC00450094), Washington, United States, with 38 years of record.
Key Facts for Alder Dam Camp
Alder Dam Camp (USC00450094) is a weather station in Washington, United States at 46.80 latitude and -122.32 longitude, 397 m (1,302 ft) above sea level.
The station reports from 1917 to 1954, 38 years of record.
1,464 records set at Alder Dam Camp still stand.
Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
Alder Dam Camp set a daily record precipitation of 46.7 mm (1.8 in) on 12 February 1954.
About the Station
Location: Washington, United States, 46.80 latitude, -122.32 longitude.
Elevation: 397 m (1,302 ft).
Period of record: 1917 to 1954, 38 years.
Eligible elements: tmax, tmin, prcp, snow.
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 Alder Dam Camp. 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 Alder Dam Camp, 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)
-20.0 C (-4.0 F)
n/a
n/a
Feb
21.1 C (70.0 F)
-18.9 C (-2.0 F)
n/a
n/a
Mar
25.6 C (78.1 F)
-8.3 C (17.1 F)
n/a
n/a
Apr
29.4 C (84.9 F)
-6.1 C (21.0 F)
n/a
n/a
May
32.8 C (91.0 F)
-2.8 C (27.0 F)
n/a
n/a
Jun
35.0 C (95.0 F)
-1.1 C (30.0 F)
n/a
n/a
Jul
37.2 C (99.0 F)
0.0 C (32.0 F)
n/a
n/a
Aug
36.1 C (97.0 F)
0.0 C (32.0 F)
n/a
n/a
Sep
36.7 C (98.1 F)
-5.0 C (23.0 F)
n/a
n/a
Oct
31.7 C (89.1 F)
-6.1 C (21.0 F)
n/a
n/a
Nov
22.2 C (72.0 F)
-12.8 C (9.0 F)
n/a
n/a
Dec
17.8 C (64.0 F)
-19.4 C (-2.9 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Alder Dam Camp still stand. 1930 holds the most, with 71.
Standing records at Alder Dam Camp by the year they were set
Year set
Standing records
1917
63
1918
32
1919
54
1920
35
1921
39
1922
35
1923
28
1924
60
1925
39
1926
50
1927
37
1928
43
1929
46
1930
71
1931
46
1932
42
1933
36
1934
42
1935
53
1936
42
1937
32
1938
34
1939
34
1940
48
1941
44
1942
24
1943
35
1944
51
1945
24
1946
26
1947
32
1948
21
1949
35
1950
49
1951
23
1952
29
1953
27
1954
3
Wettest Day of Each Month
Jan: 98.8 mm (3.9 in)
The wettest day on record for each calendar month at Alder Dam Camp. The most was 98.8 mm (3.9 in) on 22 January 1919.
Record daily precipitation for each month at Alder Dam Camp
Month
Record daily precipitation (mm)
Date
Jan
98.8 mm (3.9 in)
22 January 1919
Feb
70.9 mm (2.8 in)
22 February 1936
Mar
54.9 mm (2.2 in)
31 March 1931
Apr
48.8 mm (1.9 in)
14 April 1937
May
28.7 mm (1.1 in)
20 May 1930
Jun
52.6 mm (2.1 in)
7 June 1936
Jul
28.7 mm (1.1 in)
12 July 1920
Aug
38.9 mm (1.5 in)
26 August 1926
Sep
38.1 mm (1.5 in)
27 September 1927
Oct
54.4 mm (2.1 in)
25 October 1934
Nov
52.3 mm (2.1 in)
5 November 1934
Dec
72.9 mm (2.9 in)
17 December 1933
Period of Record Coverage
1917 to 1954
Complete yearUnder 90 percent of days
38 years of record at Alder Dam Camp, 1917 to 1954. 2 years have data for under 90 percent of days and are left out of rankings: 1924, 1954.
Cooler than the station meanWarmer than the station mean
One stripe for each of 34 complete years at Alder Dam Camp, 1919 to 1953. Blue stripes are years cooler than the station's own mean of 9.2 C (48.6 F); red stripes are warmer. The coolest year was 1930, at 7.8 C (46.1 F), and the warmest was 1947, at 10.5 C (50.9 F). The strongest colour marks a difference of 1.5 C (2.7 F).
Annual mean temperature at Alder Dam Camp as warming stripes, 1919 to 1953
Year
Annual mean temperature
Difference from the station mean
1919
8.6 C
-0.65 C
1920
8.7 C
-0.57 C
1921
8.6 C
-0.63 C
1922
8.1 C
-1.14 C
1923
8.6 C
-0.70 C
1925
9.5 C
+0.25 C
1926
10.1 C
+0.84 C
1927
8.9 C
-0.33 C
1928
9.3 C
+0.06 C
1929
8.1 C
-1.19 C
1930
7.8 C
-1.43 C
1931
9.3 C
+0.06 C
1932
8.9 C
-0.37 C
1933
8.3 C
-0.94 C
1934
10.2 C
+0.91 C
1935
8.3 C
-0.92 C
1936
8.5 C
-0.73 C
1937
8.6 C
-0.64 C
1938
9.3 C
+0.00 C
1939
9.7 C
+0.45 C
1940
10.5 C
+1.22 C
1941
10.1 C
+0.88 C
1942
9.5 C
+0.22 C
1943
9.5 C
+0.21 C
1944
10.0 C
+0.71 C
1945
10.2 C
+0.99 C
1946
9.8 C
+0.59 C
1947
10.5 C
+1.26 C
1948
8.8 C
-0.49 C
1949
9.2 C
-0.10 C
1950
9.0 C
-0.21 C
1951
9.7 C
+0.44 C
1952
10.0 C
+0.77 C
1953
10.3 C
+1.01 C
The annual mean temperature here has risen by 0.4 C (0.2 to 0.6) per decade over 1919 to 1953. In Fahrenheit: 0.7 F (0.3 to 1.1) per decade. The slope is a straight line fitted to 34 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Alder Dam Camp
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.4 C (0.2 to 0.6) per decade
0.7 F (0.3 to 1.1) per decade
1919 to 1953
34
Rise
Mean daily maximum
0.4 C (0.1 to 0.7) per decade
0.8 F (0.2 to 1.3) per decade
1919 to 1953
34
Rise
Mean daily minimum
0.4 C (0.1 to 0.6) per decade
0.7 F (0.2 to 1.2) per decade
1919 to 1953
34
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
1917 to 1954
Yearly extremes at Alder Dam Camp: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
37.2 C (99.0 F)
1926
33.3 C (91.9 F)
38
Coldest night (TNn)
-20.0 C (-4.0 F)
1930
-11.4 C (11.5 F)
38
Wettest day (Rx1day)
98.8 mm (3.9 in)
1919
44.1 mm (1.7 in)
38
Wettest five days (Rx5day)
248.6 mm (9.8 in)
1933
98.8 mm (3.9 in)
38
Longest dry spell (CDD)
52 days
1951
29 days
38
Hottest day (TXx)
The hottest day of the year at Alder Dam Camp, 1917 to 1954. The record is 37.2 C (99.0 F) in 1926, marked on the chart; the median year is 33.3 C (91.9 F).
Hottest day (TXx) at Alder Dam Camp by year
Year
Hottest day (TXx)
1917
32.8 C (91.0 F)
1918
30.6 C (87.1 F)
1919
32.2 C (90.0 F)
1920
32.8 C (91.0 F)
1921
29.4 C (84.9 F)
1922
33.3 C (91.9 F)
1923
31.7 C (89.1 F)
1924
28.9 C (84.0 F)
1925
35.0 C (95.0 F)
1926
37.2 C (99.0 F)
1927
34.4 C (93.9 F)
1928
35.0 C (95.0 F)
1929
31.1 C (88.0 F)
1930
33.3 C (91.9 F)
1931
36.1 C (97.0 F)
1932
31.7 C (89.1 F)
1933
34.4 C (93.9 F)
1934
33.9 C (93.0 F)
1935
36.1 C (97.0 F)
1936
32.2 C (90.0 F)
1937
31.7 C (89.1 F)
1938
36.1 C (97.0 F)
1939
34.4 C (93.9 F)
1940
34.4 C (93.9 F)
1941
36.1 C (97.0 F)
1942
33.9 C (93.0 F)
1943
32.8 C (91.0 F)
1944
36.7 C (98.1 F)
1945
33.3 C (91.9 F)
1946
34.4 C (93.9 F)
1947
31.1 C (88.0 F)
1948
31.1 C (88.0 F)
1949
32.8 C (91.0 F)
1950
32.2 C (90.0 F)
1951
34.4 C (93.9 F)
1952
33.9 C (93.0 F)
1953
31.7 C (89.1 F)
1954
18.3 C (64.9 F)
Coldest night (TNn)
The coldest night of the year at Alder Dam Camp, 1917 to 1954. The record is -20.0 C (-4.0 F) in 1930, marked on the chart; the median year is -11.4 C (11.5 F).
Coldest night (TNn) at Alder Dam Camp by year
Year
Coldest night (TNn)
1917
-7.8 C (18.0 F)
1918
-7.2 C (19.0 F)
1919
-19.4 C (-2.9 F)
1920
-8.9 C (16.0 F)
1921
-11.1 C (12.0 F)
1922
-18.3 C (-0.9 F)
1923
-10.0 C (14.0 F)
1924
-16.7 C (1.9 F)
1925
-6.1 C (21.0 F)
1926
-11.7 C (10.9 F)
1927
-12.2 C (10.0 F)
1928
-8.9 C (16.0 F)
1929
-17.2 C (1.0 F)
1930
-20.0 C (-4.0 F)
1931
-8.9 C (16.0 F)
1932
-16.7 C (1.9 F)
1933
-15.6 C (3.9 F)
1934
-8.3 C (17.1 F)
1935
-18.9 C (-2.0 F)
1936
-12.2 C (10.0 F)
1937
-17.8 C (0.0 F)
1938
-8.9 C (16.0 F)
1939
-6.7 C (19.9 F)
1940
-11.1 C (12.0 F)
1941
-9.4 C (15.1 F)
1942
-13.3 C (8.1 F)
1943
-16.7 C (1.9 F)
1944
-8.3 C (17.1 F)
1945
-6.1 C (21.0 F)
1946
-7.2 C (19.0 F)
1947
-12.8 C (9.0 F)
1948
-7.2 C (19.0 F)
1949
-15.0 C (5.0 F)
1950
-18.9 C (-2.0 F)
1951
-12.8 C (9.0 F)
1952
-11.7 C (10.9 F)
1953
-4.4 C (24.1 F)
1954
-8.3 C (17.1 F)
Wettest day (Rx1day)
The wettest day of the year at Alder Dam Camp, 1917 to 1954. The record is 98.8 mm (3.9 in) in 1919, marked on the chart; the median year is 44.1 mm (1.7 in).
Wettest day (Rx1day) at Alder Dam Camp by year
Year
Wettest day (Rx1day)
1917
50.0 mm (2.0 in)
1918
47.5 mm (1.9 in)
1919
98.8 mm (3.9 in)
1920
31.5 mm (1.2 in)
1921
38.9 mm (1.5 in)
1922
43.9 mm (1.7 in)
1923
68.6 mm (2.7 in)
1924
38.6 mm (1.5 in)
1925
29.2 mm (1.1 in)
1926
38.9 mm (1.5 in)
1927
49.5 mm (1.9 in)
1928
50.8 mm (2.0 in)
1929
39.6 mm (1.6 in)
1930
38.9 mm (1.5 in)
1931
54.9 mm (2.2 in)
1932
56.6 mm (2.2 in)
1933
72.9 mm (2.9 in)
1934
54.4 mm (2.1 in)
1935
41.7 mm (1.6 in)
1936
70.9 mm (2.8 in)
1937
59.7 mm (2.4 in)
1938
32.0 mm (1.3 in)
1939
49.3 mm (1.9 in)
1940
36.3 mm (1.4 in)
1941
43.7 mm (1.7 in)
1942
45.2 mm (1.8 in)
1943
44.2 mm (1.7 in)
1944
31.5 mm (1.2 in)
1945
57.4 mm (2.3 in)
1946
54.9 mm (2.2 in)
1947
39.1 mm (1.5 in)
1948
42.2 mm (1.7 in)
1949
40.6 mm (1.6 in)
1950
43.9 mm (1.7 in)
1951
41.4 mm (1.6 in)
1952
32.8 mm (1.3 in)
1953
45.5 mm (1.8 in)
1954
46.7 mm (1.8 in)
Wettest five days (Rx5day)
The wettest five days of the year at Alder Dam Camp, 1917 to 1954. The record is 248.6 mm (9.8 in) in 1933, marked on the chart; the median year is 98.8 mm (3.9 in).
Wettest five days (Rx5day) at Alder Dam Camp by year
Year
Wettest five days (Rx5day)
1917
164.8 mm (6.5 in)
1918
97.0 mm (3.8 in)
1919
181.9 mm (7.2 in)
1920
84.9 mm (3.3 in)
1921
113.6 mm (4.5 in)
1922
84.5 mm (3.3 in)
1923
110.5 mm (4.4 in)
1924
88.4 mm (3.5 in)
1925
74.2 mm (2.9 in)
1926
72.2 mm (2.8 in)
1927
88.7 mm (3.5 in)
1928
89.4 mm (3.5 in)
1929
114.2 mm (4.5 in)
1930
93.9 mm (3.7 in)
1931
110.5 mm (4.4 in)
1932
135.8 mm (5.3 in)
1933
248.6 mm (9.8 in)
1934
150.6 mm (5.9 in)
1935
85.0 mm (3.3 in)
1936
124.6 mm (4.9 in)
1937
169.1 mm (6.7 in)
1938
77.2 mm (3.0 in)
1939
131.4 mm (5.2 in)
1940
81.8 mm (3.2 in)
1941
132.1 mm (5.2 in)
1942
100.6 mm (4.0 in)
1943
96.0 mm (3.8 in)
1944
50.1 mm (2.0 in)
1945
96.0 mm (3.8 in)
1946
117.7 mm (4.6 in)
1947
104.7 mm (4.1 in)
1948
84.9 mm (3.3 in)
1949
82.3 mm (3.2 in)
1950
80.2 mm (3.2 in)
1951
108.0 mm (4.3 in)
1952
67.9 mm (2.7 in)
1953
145.6 mm (5.7 in)
1954
110.0 mm (4.3 in)
Longest dry spell (CDD)
The longest dry spell of the year at Alder Dam Camp, 1917 to 1954. The record is 52 days in 1951, marked on the chart; the median year is 29 days.
Longest dry spell (CDD) at Alder Dam Camp by year
Year
Longest dry spell (CDD)
1917
40 days
1918
38 days
1919
16 days
1920
36 days
1921
46 days
1922
26 days
1923
43 days
1924
26 days
1925
19 days
1926
16 days
1927
37 days
1928
26 days
1929
18 days
1930
40 days
1931
23 days
1932
16 days
1933
32 days
1934
31 days
1935
21 days
1936
42 days
1937
21 days
1938
33 days
1939
36 days
1940
26 days
1941
43 days
1942
32 days
1943
28 days
1944
44 days
1945
34 days
1946
24 days
1947
21 days
1948
13 days
1949
19 days
1950
30 days
1951
52 days
1952
37 days
1953
21 days
1954
11 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
34 years with a frost
Across 34 years with a frost, the median last spring frost at Alder Dam Camp falls on 19 May and the median first autumn frost on 2 October, which leaves a median of 144 days between them.
Fitted over all years, the growing season changes by +21.0 days per decade at this station.
Frost dates and growing season at Alder Dam Camp
Measure
Median, all years
Earliest period
Recent period (1923 to 1953)
Recent against earliest
Fitted trend
Last spring frost
19 May
n/a
15 May
n/a
-9.1 days per decade
First autumn frost
2 October
n/a
2 October
n/a
+11.9 days per decade
Growing days
144 days
n/a
144 days
n/a
+21.0 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
34 years, 1918 to 1953
A day with at least 44.0 mm (1.7 in) of rain is expected about once in 2 years. A day with at least 83.0 mm (3.3 in) of rain is expected about once in 100 years.
Rainfall return levels at Alder Dam Camp: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
44.0 mm (1.7 in)
5 years
54.2 mm (2.1 in)
10 years
61.1 mm (2.4 in)
25 years
69.8 mm (2.7 in)
50 years
76.4 mm (3.0 in)
Longer than the 34 years of record
100 years
83.0 mm (3.3 in)
Longer than the 34 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, 34 years of values from 1918 to 1953.
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: 72.9 mm (2.9 in) in 1933; 70.9 mm (2.8 in) in 1936; 68.6 mm (2.7 in) in 1923.
Download the Data
Data for Alder Dam Camp standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Alder Dam Camp 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.