Record envelope, standing records and threshold days for Deadwood Dam (USC00102385), Idaho, United States, with 47 years of record.
Key Facts for Deadwood Dam
Deadwood Dam (USC00102385) is a weather station in Idaho, United States at 44.32 latitude and -115.63 longitude, 1,641 m (5,384 ft) above sea level.
The station reports from 1929 to 1975, 47 years of record.
1,464 records set at Deadwood Dam still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Deadwood Dam tied a daily record low minimum temperature of -2.8 C (27.0 F) on 28 June 1975.
About the Station
Location: Idaho, United States, 44.32 latitude, -115.63 longitude.
Elevation: 1,641 m (5,384 ft).
Period of record: 1929 to 1975, 47 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 Deadwood Dam. 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 Deadwood Dam, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
11.1 C (52.0 F)
-42.8 C (-45.0 F)
n/a
n/a
Feb
15.6 C (60.1 F)
-44.4 C (-47.9 F)
n/a
n/a
Mar
18.9 C (66.0 F)
-35.6 C (-32.1 F)
n/a
n/a
Apr
26.1 C (79.0 F)
-23.3 C (-9.9 F)
n/a
n/a
May
31.7 C (89.1 F)
-12.2 C (10.0 F)
n/a
n/a
Jun
36.1 C (97.0 F)
-7.2 C (19.0 F)
n/a
n/a
Jul
37.8 C (100.0 F)
-5.6 C (21.9 F)
n/a
n/a
Aug
38.3 C (100.9 F)
-6.1 C (21.0 F)
n/a
n/a
Sep
36.1 C (97.0 F)
-10.6 C (12.9 F)
n/a
n/a
Oct
27.8 C (82.0 F)
-16.7 C (1.9 F)
n/a
n/a
Nov
20.6 C (69.1 F)
-29.4 C (-20.9 F)
n/a
n/a
Dec
11.1 C (52.0 F)
-37.2 C (-35.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Deadwood Dam still stand. 1930 holds the most, with 60.
Standing records at Deadwood Dam by the year they were set
Year set
Standing records
1929
7
1930
60
1931
43
1932
29
1933
49
1934
54
1935
37
1936
55
1937
57
1938
24
1939
37
1940
32
1941
20
1942
37
1943
36
1944
30
1945
55
1946
21
1947
34
1948
24
1949
36
1950
46
1951
27
1952
22
1953
19
1954
31
1955
36
1956
26
1957
28
1958
30
1959
22
1960
28
1961
25
1962
32
1963
41
1964
21
1965
20
1966
28
1967
19
1968
28
1969
27
1970
23
1971
23
1972
37
1973
13
1974
22
1975
13
All-Time Record Progression
4 new records
4 all-time records were set at Deadwood Dam between 19 July 1960 and 16 January 1971. Each dot is a new record.
When Deadwood Dam set new all-time records
Date
Kind
Detail
1960-07-19
Record high maximum temperature
Record high maximum temperature 37.8 C (100.0 F)
1961-08-04
Record high maximum temperature
Record high maximum temperature 38.3 C (100.9 F)
1969-02-01
Record snow depth
Record snow depth 208.3 cm (82.0 in)
1971-01-16
Record snow depth
Record snow depth 213.4 cm (84.0 in)
Wettest Day of Each Month
Dec: 78.0 mm (3.1 in)
The wettest day on record for each calendar month at Deadwood Dam. The most was 78.0 mm (3.1 in) on 2 December 1941.
Record daily precipitation for each month at Deadwood Dam
Month
Record daily precipitation (mm)
Date
Jan
68.6 mm (2.7 in)
1 January 1932
Feb
58.4 mm (2.3 in)
22 February 1933
Mar
42.7 mm (1.7 in)
17 March 1950
Apr
36.1 mm (1.4 in)
6 April 1963
May
50.8 mm (2.0 in)
16 May 1933
Jun
54.4 mm (2.1 in)
26 June 1971
Jul
52.8 mm (2.1 in)
25 July 1934
Aug
38.4 mm (1.5 in)
10 August 1936
Sep
29.2 mm (1.1 in)
12 September 1939
Oct
65.0 mm (2.6 in)
16 October 1947
Nov
73.7 mm (2.9 in)
19 November 1946
Dec
78.0 mm (3.1 in)
2 December 1941
Period of Record Coverage
1929 to 1975
Complete yearUnder 90 percent of days
47 years of record at Deadwood Dam, 1929 to 1975. 3 years have data for under 90 percent of days and are left out of rankings: 1929, 1974, 1975.
Cooler than the station meanWarmer than the station mean
One stripe for each of 41 complete years at Deadwood Dam, 1930 to 1973. Blue stripes are years cooler than the station's own mean of 3.8 C (38.8 F); red stripes are warmer. The coolest year was 1937, at 2.1 C (35.8 F), and the warmest was 1958, at 5.1 C (41.2 F). The strongest colour marks a difference of 1.7 C (3.1 F).
Annual mean temperature at Deadwood Dam as warming stripes, 1930 to 1973
Year
Annual mean temperature
Difference from the station mean
1930
4.0 C
+0.26 C
1931
4.1 C
+0.34 C
1932
2.5 C
-1.21 C
1935
2.4 C
-1.36 C
1936
2.9 C
-0.84 C
1937
2.1 C
-1.64 C
1938
3.1 C
-0.63 C
1939
4.4 C
+0.65 C
1940
4.9 C
+1.13 C
1941
4.2 C
+0.49 C
1942
3.1 C
-0.70 C
1943
3.3 C
-0.47 C
1944
2.4 C
-1.36 C
1945
2.3 C
-1.48 C
1947
4.2 C
+0.41 C
1948
2.9 C
-0.87 C
1949
3.5 C
-0.25 C
1950
3.4 C
-0.35 C
1951
2.9 C
-0.90 C
1952
3.5 C
-0.25 C
1953
4.5 C
+0.77 C
1954
4.0 C
+0.25 C
1955
2.7 C
-1.05 C
1956
3.6 C
-0.14 C
1957
3.9 C
+0.12 C
1958
5.1 C
+1.34 C
1959
4.1 C
+0.30 C
1960
4.1 C
+0.30 C
1961
4.7 C
+0.91 C
1962
4.1 C
+0.32 C
1963
4.5 C
+0.76 C
1964
3.6 C
-0.14 C
1965
4.4 C
+0.69 C
1966
4.6 C
+0.82 C
1967
4.4 C
+0.67 C
1968
4.3 C
+0.52 C
1969
4.6 C
+0.87 C
1970
3.8 C
+0.07 C
1971
3.8 C
+0.08 C
1972
4.4 C
+0.67 C
1973
4.8 C
+1.01 C
The annual mean temperature here has risen by 0.3 C (0.2 to 0.5) per decade over 1930 to 1973. In Fahrenheit: 0.6 F (0.3 to 0.9) per decade. The slope is a straight line fitted to 41 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Deadwood Dam
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.3 C (0.2 to 0.5) per decade
0.6 F (0.3 to 0.9) per decade
1930 to 1973
41
Rise
Mean daily maximum
0.00 C (-0.20 to 0.21) per decade
0.01 F (-0.36 to 0.37) per decade
1930 to 1973
41
Not clearly different from zero
Mean daily minimum
0.7 C (0.4 to 0.9) per decade
1.2 F (0.8 to 1.6) per decade
1930 to 1973
41
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
1929 to 1975
Yearly extremes at Deadwood Dam: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
38.3 C (100.9 F)
1961
34.4 C (93.9 F)
47
Coldest night (TNn)
-44.4 C (-47.9 F)
1933
-33.3 C (-27.9 F)
47
Wettest day (Rx1day)
78.0 mm (3.1 in)
1941
43.2 mm (1.7 in)
47
Wettest five days (Rx5day)
228.4 mm (9.0 in)
1964
96.0 mm (3.8 in)
47
Longest dry spell (CDD)
96 days
1931
34 days
47
Hottest day (TXx)
The hottest day of the year at Deadwood Dam, 1929 to 1975. The record is 38.3 C (100.9 F) in 1961, marked on the chart; the median year is 34.4 C (93.9 F).
Hottest day (TXx) at Deadwood Dam by year
Year
Hottest day (TXx)
1929
6.7 C (44.1 F)
1930
35.0 C (95.0 F)
1931
37.2 C (99.0 F)
1932
35.0 C (95.0 F)
1933
36.7 C (98.1 F)
1934
34.4 C (93.9 F)
1935
36.7 C (98.1 F)
1936
36.7 C (98.1 F)
1937
33.3 C (91.9 F)
1938
34.4 C (93.9 F)
1939
35.0 C (95.0 F)
1940
36.1 C (97.0 F)
1941
35.0 C (95.0 F)
1942
36.1 C (97.0 F)
1943
36.1 C (97.0 F)
1944
31.7 C (89.1 F)
1945
32.8 C (91.0 F)
1946
34.4 C (93.9 F)
1947
33.9 C (93.0 F)
1948
33.9 C (93.0 F)
1949
35.6 C (96.1 F)
1950
36.1 C (97.0 F)
1951
33.3 C (91.9 F)
1952
32.8 C (91.0 F)
1953
35.0 C (95.0 F)
1954
33.9 C (93.0 F)
1955
35.6 C (96.1 F)
1956
35.0 C (95.0 F)
1957
32.8 C (91.0 F)
1958
33.9 C (93.0 F)
1959
36.1 C (97.0 F)
1960
37.8 C (100.0 F)
1961
38.3 C (100.9 F)
1962
33.3 C (91.9 F)
1963
33.3 C (91.9 F)
1964
33.9 C (93.0 F)
1965
34.4 C (93.9 F)
1966
35.0 C (95.0 F)
1967
35.0 C (95.0 F)
1968
34.4 C (93.9 F)
1969
37.2 C (99.0 F)
1970
33.9 C (93.0 F)
1971
34.4 C (93.9 F)
1972
34.4 C (93.9 F)
1973
36.7 C (98.1 F)
1974
32.8 C (91.0 F)
1975
26.7 C (80.1 F)
Coldest night (TNn)
The coldest night of the year at Deadwood Dam, 1929 to 1975. The record is -44.4 C (-47.9 F) in 1933, marked on the chart; the median year is -33.3 C (-27.9 F).
Coldest night (TNn) at Deadwood Dam by year
Year
Coldest night (TNn)
1929
-19.4 C (-2.9 F)
1930
-37.2 C (-35.0 F)
1931
-32.8 C (-27.0 F)
1932
-35.0 C (-31.0 F)
1933
-44.4 C (-47.9 F)
1934
-27.2 C (-17.0 F)
1935
-38.9 C (-38.0 F)
1936
-36.1 C (-33.0 F)
1937
-42.2 C (-44.0 F)
1938
-32.2 C (-26.0 F)
1939
-32.8 C (-27.0 F)
1940
-27.8 C (-18.0 F)
1941
-31.1 C (-24.0 F)
1942
-37.8 C (-36.0 F)
1943
-42.8 C (-45.0 F)
1944
-31.1 C (-24.0 F)
1945
-32.2 C (-26.0 F)
1946
-30.0 C (-22.0 F)
1947
-33.9 C (-29.0 F)
1948
-35.0 C (-31.0 F)
1949
-37.2 C (-35.0 F)
1950
-38.3 C (-36.9 F)
1951
-37.2 C (-35.0 F)
1952
-33.3 C (-27.9 F)
1953
-31.7 C (-25.1 F)
1954
-33.9 C (-29.0 F)
1955
-35.6 C (-32.1 F)
1956
-37.8 C (-36.0 F)
1957
-33.9 C (-29.0 F)
1958
-26.7 C (-16.1 F)
1959
-38.9 C (-38.0 F)
1960
-32.8 C (-27.0 F)
1961
-30.6 C (-23.1 F)
1962
-38.9 C (-38.0 F)
1963
-33.3 C (-27.9 F)
1964
-37.2 C (-35.0 F)
1965
-30.0 C (-22.0 F)
1966
-30.0 C (-22.0 F)
1967
-32.2 C (-26.0 F)
1968
-31.1 C (-24.0 F)
1969
-28.9 C (-20.0 F)
1970
-31.7 C (-25.1 F)
1971
-37.2 C (-35.0 F)
1972
-35.6 C (-32.1 F)
1973
-31.1 C (-24.0 F)
1974
-35.0 C (-31.0 F)
1975
-30.0 C (-22.0 F)
Wettest day (Rx1day)
The wettest day of the year at Deadwood Dam, 1929 to 1975. The record is 78.0 mm (3.1 in) in 1941, marked on the chart; the median year is 43.2 mm (1.7 in).
Wettest day (Rx1day) at Deadwood Dam by year
Year
Wettest day (Rx1day)
1929
56.6 mm (2.2 in)
1930
36.8 mm (1.4 in)
1931
63.5 mm (2.5 in)
1932
68.6 mm (2.7 in)
1933
58.4 mm (2.3 in)
1934
52.8 mm (2.1 in)
1935
27.4 mm (1.1 in)
1936
38.9 mm (1.5 in)
1937
49.5 mm (1.9 in)
1938
31.2 mm (1.2 in)
1939
44.7 mm (1.8 in)
1940
43.2 mm (1.7 in)
1941
78.0 mm (3.1 in)
1942
45.7 mm (1.8 in)
1943
51.1 mm (2.0 in)
1944
31.8 mm (1.3 in)
1945
30.5 mm (1.2 in)
1946
73.7 mm (2.9 in)
1947
65.0 mm (2.6 in)
1948
40.6 mm (1.6 in)
1949
44.5 mm (1.8 in)
1950
42.7 mm (1.7 in)
1951
39.4 mm (1.6 in)
1952
37.8 mm (1.5 in)
1953
41.7 mm (1.6 in)
1954
46.5 mm (1.8 in)
1955
50.8 mm (2.0 in)
1956
45.0 mm (1.8 in)
1957
39.1 mm (1.5 in)
1958
40.4 mm (1.6 in)
1959
38.6 mm (1.5 in)
1960
46.5 mm (1.8 in)
1961
36.3 mm (1.4 in)
1962
36.3 mm (1.4 in)
1963
39.1 mm (1.5 in)
1964
78.0 mm (3.1 in)
1965
35.3 mm (1.4 in)
1966
47.8 mm (1.9 in)
1967
36.3 mm (1.4 in)
1968
35.6 mm (1.4 in)
1969
62.5 mm (2.5 in)
1970
47.8 mm (1.9 in)
1971
54.4 mm (2.1 in)
1972
33.3 mm (1.3 in)
1973
42.4 mm (1.7 in)
1974
56.4 mm (2.2 in)
1975
31.8 mm (1.3 in)
Wettest five days (Rx5day)
The wettest five days of the year at Deadwood Dam, 1929 to 1975. The record is 228.4 mm (9.0 in) in 1964, marked on the chart; the median year is 96.0 mm (3.8 in).
Wettest five days (Rx5day) at Deadwood Dam by year
Year
Wettest five days (Rx5day)
1929
189.7 mm (7.5 in)
1930
55.8 mm (2.2 in)
1931
185.4 mm (7.3 in)
1932
170.2 mm (6.7 in)
1933
121.9 mm (4.8 in)
1934
64.8 mm (2.6 in)
1935
57.6 mm (2.3 in)
1936
101.1 mm (4.0 in)
1937
107.4 mm (4.2 in)
1938
103.9 mm (4.1 in)
1939
82.3 mm (3.2 in)
1940
106.0 mm (4.2 in)
1941
91.7 mm (3.6 in)
1942
84.4 mm (3.3 in)
1943
153.3 mm (6.0 in)
1944
80.8 mm (3.2 in)
1945
70.4 mm (2.8 in)
1946
155.8 mm (6.1 in)
1947
65.0 mm (2.6 in)
1948
83.5 mm (3.3 in)
1949
76.1 mm (3.0 in)
1950
103.1 mm (4.1 in)
1951
106.0 mm (4.2 in)
1952
70.4 mm (2.8 in)
1953
86.6 mm (3.4 in)
1954
94.3 mm (3.7 in)
1955
206.0 mm (8.1 in)
1956
90.7 mm (3.6 in)
1957
138.2 mm (5.4 in)
1958
69.3 mm (2.7 in)
1959
63.3 mm (2.5 in)
1960
71.6 mm (2.8 in)
1961
82.3 mm (3.2 in)
1962
126.8 mm (5.0 in)
1963
110.4 mm (4.3 in)
1964
228.4 mm (9.0 in)
1965
80.7 mm (3.2 in)
1966
136.3 mm (5.4 in)
1967
77.2 mm (3.0 in)
1968
104.3 mm (4.1 in)
1969
128.8 mm (5.1 in)
1970
108.0 mm (4.3 in)
1971
109.3 mm (4.3 in)
1972
96.0 mm (3.8 in)
1973
87.6 mm (3.4 in)
1974
157.0 mm (6.2 in)
1975
60.8 mm (2.4 in)
Longest dry spell (CDD)
The longest dry spell of the year at Deadwood Dam, 1929 to 1975. The record is 96 days in 1931, marked on the chart; the median year is 34 days.
Longest dry spell (CDD) at Deadwood Dam by year
Year
Longest dry spell (CDD)
1929
3 days
1930
29 days
1931
96 days
1932
38 days
1933
32 days
1934
34 days
1935
69 days
1936
47 days
1937
34 days
1938
21 days
1939
29 days
1940
28 days
1941
23 days
1942
54 days
1943
32 days
1944
41 days
1945
25 days
1946
17 days
1947
52 days
1948
30 days
1949
37 days
1950
32 days
1951
26 days
1952
56 days
1953
46 days
1954
35 days
1955
53 days
1956
30 days
1957
40 days
1958
16 days
1959
24 days
1960
45 days
1961
36 days
1962
39 days
1963
20 days
1964
37 days
1965
26 days
1966
54 days
1967
50 days
1968
30 days
1969
66 days
1970
26 days
1971
39 days
1972
26 days
1973
26 days
1974
49 days
1975
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
41 years with a frost
Across 41 years with a frost, the median last spring frost at Deadwood Dam falls on 29 June and the median first autumn frost on 4 July, which leaves a median of 9 days between them.
Fitted over all years, the growing season changes by -2.2 days per decade at this station.
Frost dates and growing season at Deadwood Dam
Measure
Median, all years
Earliest period
Recent period (1943 to 1973)
Recent against earliest
Fitted trend
Last spring frost
29 June
n/a
29 June
n/a
-0.2 days per decade
First autumn frost
4 July
n/a
2 July
n/a
-2.4 days per decade
Growing days
9 days
n/a
7 days
n/a
-2.2 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
44 years, 1930 to 1973
A day with at least 43.2 mm (1.7 in) of rain is expected about once in 2 years. A day with at least 93.4 mm (3.7 in) of rain is expected about once in 100 years.
Rainfall return levels at Deadwood Dam: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
43.2 mm (1.7 in)
5 years
54.2 mm (2.1 in)
10 years
62.4 mm (2.5 in)
25 years
73.9 mm (2.9 in)
50 years
83.3 mm (3.3 in)
Longer than the 44 years of record
100 years
93.4 mm (3.7 in)
Longer than the 44 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, 44 years of values from 1930 to 1973.
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: 78.0 mm (3.1 in) in 1941; 78.0 mm (3.1 in) in 1964; 73.7 mm (2.9 in) in 1946.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Download the Data
Data for Deadwood Dam standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Deadwood Dam 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 2026-10-13 (13 October 2026). Records are computed by this site and are not official.