Record envelope, standing records and threshold days for Oahe Dam (USC00396170), South Dakota, United States, with 67 years of record.
Key Facts for Oahe Dam
Oahe Dam (USC00396170) is a weather station in South Dakota, United States at 44.44 latitude and -100.42 longitude, 507 m (1,663 ft) above sea level.
The station reports from 1960 to 2026, 67 years of record.
1,464 records set at Oahe Dam still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Oahe Dam set a daily record precipitation of 38.9 mm (1.5 in) on 13 August 2026.
About the Station
Location: South Dakota, United States, 44.44 latitude, -100.42 longitude.
Elevation: 507 m (1,663 ft).
Period of record: 1960 to 2026, 67 years.
Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
17 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 Oahe Dam. The lines show the 2026 daily maximum and minimum. 17 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Oahe Dam, 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)
-32.8 C (-27.0 F)
15.6 C (60.1 F)
-27.2 C (-17.0 F)
Feb
21.7 C (71.1 F)
-36.7 C (-34.1 F)
18.3 C (64.9 F)
-17.8 C (0.0 F)
Mar
30.6 C (87.1 F)
-27.8 C (-18.0 F)
27.8 C (82.0 F)
-18.3 C (-0.9 F)
Apr
36.7 C (98.1 F)
-14.4 C (6.1 F)
34.4 C (93.9 F)
-8.3 C (17.1 F)
May
40.6 C (105.1 F)
-6.7 C (19.9 F)
34.4 C (93.9 F)
-3.9 C (25.0 F)
Jun
45.6 C (114.1 F)
1.1 C (34.0 F)
34.4 C (93.9 F)
7.8 C (46.0 F)
Jul
44.4 C (111.9 F)
3.9 C (39.0 F)
40.6 C (105.1 F)
9.4 C (48.9 F)
Aug
44.4 C (111.9 F)
2.8 C (37.0 F)
37.8 C (100.0 F)
9.4 C (48.9 F)
Sep
42.2 C (108.0 F)
-5.6 C (21.9 F)
n/a
n/a
Oct
37.2 C (99.0 F)
-14.4 C (6.1 F)
n/a
n/a
Nov
30.0 C (86.0 F)
-24.4 C (-11.9 F)
n/a
n/a
Dec
20.6 C (69.1 F)
-35.0 C (-31.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Oahe Dam still stand. 1985 holds the most, with 48.
Standing records at Oahe Dam by the year they were set
Year set
Standing records
1960
18
1961
33
1962
39
1963
39
1964
39
1965
40
1966
39
1967
22
1968
29
1969
30
1970
18
1971
15
1972
36
1973
15
1974
37
1975
27
1976
33
1977
24
1978
25
1979
25
1980
18
1981
27
1982
14
1983
36
1984
22
1985
48
1986
20
1987
32
1988
46
1989
37
1990
33
1991
44
1992
42
1993
14
1994
17
1995
13
1996
26
1997
21
1998
24
1999
15
2000
27
2001
10
2002
27
2003
15
2004
14
2005
7
2006
7
2007
11
2009
22
2010
7
2011
12
2012
18
2013
5
2018
4
2019
15
2020
9
2021
32
2022
18
2023
13
2024
18
2025
21
2026
20
All-Time Record Progression
1 new records
1 all-time records were set at Oahe Dam between 9 February 1994 and 9 February 1994. Each dot is a new record.
When Oahe Dam set new all-time records
Date
Kind
Detail
1994-02-09
Record low minimum temperature
Record low minimum temperature -36.7 C (-34.1 F)
Wettest Day of Each Month
Jun: 86.4 mm (3.4 in)
The wettest day on record for each calendar month at Oahe Dam. The most was 86.4 mm (3.4 in) on 4 June 1984.
Record daily precipitation for each month at Oahe Dam
Month
Record daily precipitation (mm)
Date
Jan
18.3 mm (0.7 in)
2 January 2019
Feb
27.9 mm (1.1 in)
18 February 1991
Mar
30.0 mm (1.2 in)
15 March 2019
Apr
61.2 mm (2.4 in)
27 April 1964
May
55.9 mm (2.2 in)
14 May 1982
Jun
86.4 mm (3.4 in)
4 June 1984
Jul
64.0 mm (2.5 in)
8 July 2019
Aug
80.5 mm (3.2 in)
12 August 2019
Sep
66.8 mm (2.6 in)
20 September 1989
Oct
33.5 mm (1.3 in)
13 October 2023
Nov
24.6 mm (1.0 in)
10 November 1998
Dec
13.2 mm (0.5 in)
31 December 1977
Period of Record Coverage
1960 to 2026
Complete yearUnder 90 percent of days
62 years of record at Oahe Dam, 1960 to 2026. 27 years have data for under 90 percent of days and are left out of rankings: 1960, 1992, 1993, 1994, 1995, 1996, 1997, 1998 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 35 complete years at Oahe Dam, 1961 to 2025. Blue stripes are years cooler than the station's own mean of 8.2 C (46.8 F); red stripes are warmer. The coolest year was 1978, at 6.5 C (43.7 F), and the warmest was 1987, at 9.9 C (49.8 F). The strongest colour marks a difference of 1.8 C (3.2 F).
Annual mean temperature at Oahe Dam as warming stripes, 1961 to 2025
Year
Annual mean temperature
Difference from the station mean
1961
8.7 C
+0.52 C
1962
8.0 C
-0.23 C
1963
9.6 C
+1.38 C
1964
8.5 C
+0.30 C
1965
7.6 C
-0.60 C
1966
7.5 C
-0.75 C
1967
7.7 C
-0.50 C
1968
7.6 C
-0.60 C
1969
7.4 C
-0.79 C
1970
7.2 C
-1.05 C
1971
7.3 C
-0.90 C
1972
6.7 C
-1.57 C
1973
8.9 C
+0.64 C
1974
8.8 C
+0.62 C
1975
7.7 C
-0.53 C
1976
9.2 C
+1.02 C
1977
8.6 C
+0.36 C
1978
6.5 C
-1.72 C
1979
6.7 C
-1.54 C
1980
9.1 C
+0.91 C
1981
9.6 C
+1.35 C
1982
7.2 C
-0.98 C
1983
8.5 C
+0.30 C
1984
8.4 C
+0.13 C
1985
7.2 C
-1.02 C
1986
8.5 C
+0.25 C
1987
9.9 C
+1.67 C
1988
9.0 C
+0.77 C
1989
7.9 C
-0.35 C
1991
9.8 C
+1.58 C
1993
7.0 C
-1.27 C
2022
8.6 C
+0.41 C
2023
8.9 C
+0.70 C
2024
9.3 C
+1.04 C
2025
8.7 C
+0.50 C
The fitted trend in annual mean temperature here over 1961 to 2025 is 0.15 C (-0.03 to 0.34) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.3 F (-0.1 to 0.6) 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 Oahe Dam
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.15 C (-0.03 to 0.34) per decade
0.3 F (-0.1 to 0.6) per decade
1961 to 2025
35
Not clearly different from zero
Mean daily maximum
0.18 C (-0.05 to 0.41) per decade
0.3 F (-0.1 to 0.7) per decade
1961 to 2025
35
Not clearly different from zero
Mean daily minimum
0.12 C (-0.04 to 0.28) per decade
0.2 F (-0.1 to 0.5) per decade
1961 to 2025
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
1960 to 2026
Yearly extremes at Oahe Dam: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
45.6 C (114.1 F)
1988
41.1 C (106.0 F)
62
Coldest night (TNn)
-36.7 C (-34.1 F)
1994
-27.2 C (-17.0 F)
62
Wettest day (Rx1day)
86.4 mm (3.4 in)
1984
38.7 mm (1.5 in)
62
Wettest five days (Rx5day)
136.2 mm (5.4 in)
1999
52.5 mm (2.1 in)
62
Longest dry spell (CDD)
83 days
1964
39 days
62
Hottest day (TXx)
The hottest day of the year at Oahe Dam, 1960 to 2026. The record is 45.6 C (114.1 F) in 1988, marked on the chart; the median year is 41.1 C (106.0 F).
Hottest day (TXx) at Oahe Dam by year
Year
Hottest day (TXx)
1960
41.7 C (107.1 F)
1961
41.1 C (106.0 F)
1962
41.1 C (106.0 F)
1963
42.8 C (109.0 F)
1964
41.7 C (107.1 F)
1965
43.3 C (109.9 F)
1966
44.4 C (111.9 F)
1967
41.1 C (106.0 F)
1968
40.0 C (104.0 F)
1969
41.1 C (106.0 F)
1970
41.1 C (106.0 F)
1971
41.1 C (106.0 F)
1972
41.1 C (106.0 F)
1973
43.9 C (111.0 F)
1974
42.8 C (109.0 F)
1975
43.3 C (109.9 F)
1976
42.2 C (108.0 F)
1977
42.2 C (108.0 F)
1978
41.7 C (107.1 F)
1979
39.4 C (102.9 F)
1980
41.7 C (107.1 F)
1981
38.9 C (102.0 F)
1982
38.9 C (102.0 F)
1983
42.2 C (108.0 F)
1984
40.6 C (105.1 F)
1985
41.7 C (107.1 F)
1986
37.8 C (100.0 F)
1987
42.8 C (109.0 F)
1988
45.6 C (114.1 F)
1989
43.9 C (111.0 F)
1990
39.4 C (102.9 F)
1991
43.3 C (109.9 F)
1992
39.4 C (102.9 F)
1993
36.7 C (98.1 F)
1994
39.4 C (102.9 F)
1995
38.9 C (102.0 F)
1996
38.9 C (102.0 F)
1997
36.7 C (98.1 F)
1998
42.2 C (108.0 F)
1999
42.8 C (109.0 F)
2000
41.1 C (106.0 F)
2001
40.6 C (105.1 F)
2002
41.1 C (106.0 F)
2003
42.8 C (109.0 F)
2004
38.3 C (100.9 F)
2005
41.7 C (107.1 F)
2006
44.4 C (111.9 F)
2007
28.3 C (82.9 F)
2009
37.2 C (99.0 F)
2010
42.2 C (108.0 F)
2011
40.6 C (105.1 F)
2012
42.8 C (109.0 F)
2013
31.7 C (89.1 F)
2018
39.4 C (102.9 F)
2019
35.0 C (95.0 F)
2020
27.8 C (82.0 F)
2021
42.8 C (109.0 F)
2022
43.3 C (109.9 F)
2023
41.1 C (106.0 F)
2024
39.4 C (102.9 F)
2025
40.0 C (104.0 F)
2026
40.6 C (105.1 F)
Coldest night (TNn)
The coldest night of the year at Oahe Dam, 1960 to 2026. The record is -36.7 C (-34.1 F) in 1994, marked on the chart; the median year is -27.2 C (-17.0 F).
Coldest night (TNn) at Oahe Dam by year
Year
Coldest night (TNn)
1960
-24.4 C (-11.9 F)
1961
-29.4 C (-20.9 F)
1962
-30.6 C (-23.1 F)
1963
-31.1 C (-24.0 F)
1964
-28.3 C (-18.9 F)
1965
-27.2 C (-17.0 F)
1966
-32.8 C (-27.0 F)
1967
-28.9 C (-20.0 F)
1968
-28.9 C (-20.0 F)
1969
-26.7 C (-16.1 F)
1970
-32.8 C (-27.0 F)
1971
-27.8 C (-18.0 F)
1972
-29.4 C (-20.9 F)
1973
-25.6 C (-14.1 F)
1974
-26.1 C (-15.0 F)
1975
-26.7 C (-16.1 F)
1976
-25.6 C (-14.1 F)
1977
-28.9 C (-20.0 F)
1978
-26.7 C (-16.1 F)
1979
-29.4 C (-20.9 F)
1980
-28.3 C (-18.9 F)
1981
-27.2 C (-17.0 F)
1982
-28.3 C (-18.9 F)
1983
-35.0 C (-31.0 F)
1984
-23.9 C (-11.0 F)
1985
-26.1 C (-15.0 F)
1986
-23.9 C (-11.0 F)
1987
-22.2 C (-8.0 F)
1988
-31.1 C (-24.0 F)
1989
-30.6 C (-23.1 F)
1990
-35.0 C (-31.0 F)
1991
-29.4 C (-20.9 F)
1992
-22.8 C (-9.0 F)
1993
-26.1 C (-15.0 F)
1994
-36.7 C (-34.1 F)
1995
-22.8 C (-9.0 F)
1996
-32.2 C (-26.0 F)
1997
-24.4 C (-11.9 F)
1998
-30.6 C (-23.1 F)
1999
-23.3 C (-9.9 F)
2000
-27.2 C (-17.0 F)
2001
-22.8 C (-9.0 F)
2002
-22.8 C (-9.0 F)
2003
-26.1 C (-15.0 F)
2004
-25.6 C (-14.1 F)
2005
-27.2 C (-17.0 F)
2006
-22.8 C (-9.0 F)
2007
-32.2 C (-26.0 F)
2009
-25.0 C (-13.0 F)
2010
-28.9 C (-20.0 F)
2011
-29.4 C (-20.9 F)
2012
-23.9 C (-11.0 F)
2013
-24.4 C (-11.9 F)
2018
-21.7 C (-7.1 F)
2019
-27.2 C (-17.0 F)
2020
-23.9 C (-11.0 F)
2021
-20.6 C (-5.1 F)
2022
-26.1 C (-15.0 F)
2023
-26.1 C (-15.0 F)
2024
-28.3 C (-18.9 F)
2025
-28.9 C (-20.0 F)
2026
-27.2 C (-17.0 F)
Wettest day (Rx1day)
The wettest day of the year at Oahe Dam, 1960 to 2026. The record is 86.4 mm (3.4 in) in 1984, marked on the chart; the median year is 38.7 mm (1.5 in).
Wettest day (Rx1day) at Oahe Dam by year
Year
Wettest day (Rx1day)
1960
55.9 mm (2.2 in)
1961
50.8 mm (2.0 in)
1962
33.8 mm (1.3 in)
1963
29.7 mm (1.2 in)
1964
61.2 mm (2.4 in)
1965
29.5 mm (1.2 in)
1966
43.7 mm (1.7 in)
1967
54.1 mm (2.1 in)
1968
40.6 mm (1.6 in)
1969
61.0 mm (2.4 in)
1970
40.9 mm (1.6 in)
1971
58.4 mm (2.3 in)
1972
27.7 mm (1.1 in)
1973
38.9 mm (1.5 in)
1974
21.1 mm (0.8 in)
1975
42.2 mm (1.7 in)
1976
13.2 mm (0.5 in)
1977
39.9 mm (1.6 in)
1978
29.0 mm (1.1 in)
1979
38.4 mm (1.5 in)
1980
31.0 mm (1.2 in)
1981
37.6 mm (1.5 in)
1982
55.9 mm (2.2 in)
1983
33.0 mm (1.3 in)
1984
86.4 mm (3.4 in)
1985
19.1 mm (0.8 in)
1986
34.8 mm (1.4 in)
1987
27.2 mm (1.1 in)
1988
65.3 mm (2.6 in)
1989
66.8 mm (2.6 in)
1990
26.7 mm (1.1 in)
1991
46.5 mm (1.8 in)
1992
33.5 mm (1.3 in)
1993
33.0 mm (1.3 in)
1994
33.5 mm (1.3 in)
1995
51.8 mm (2.0 in)
1996
43.2 mm (1.7 in)
1997
55.9 mm (2.2 in)
1998
32.0 mm (1.3 in)
1999
63.8 mm (2.5 in)
2000
40.6 mm (1.6 in)
2001
32.3 mm (1.3 in)
2002
34.0 mm (1.3 in)
2003
45.0 mm (1.8 in)
2004
18.8 mm (0.7 in)
2005
24.4 mm (1.0 in)
2006
11.7 mm (0.5 in)
2007
23.4 mm (0.9 in)
2009
47.0 mm (1.9 in)
2010
35.8 mm (1.4 in)
2011
40.6 mm (1.6 in)
2012
23.4 mm (0.9 in)
2013
41.7 mm (1.6 in)
2018
18.3 mm (0.7 in)
2019
80.5 mm (3.2 in)
2020
24.4 mm (1.0 in)
2021
32.3 mm (1.3 in)
2022
40.6 mm (1.6 in)
2023
47.2 mm (1.9 in)
2024
23.6 mm (0.9 in)
2025
49.5 mm (1.9 in)
2026
38.9 mm (1.5 in)
Wettest five days (Rx5day)
The wettest five days of the year at Oahe Dam, 1960 to 2026. The record is 136.2 mm (5.4 in) in 1999, marked on the chart; the median year is 52.5 mm (2.1 in).
Wettest five days (Rx5day) at Oahe Dam by year
Year
Wettest five days (Rx5day)
1960
69.4 mm (2.7 in)
1961
92.2 mm (3.6 in)
1962
85.8 mm (3.4 in)
1963
48.0 mm (1.9 in)
1964
89.9 mm (3.5 in)
1965
40.6 mm (1.6 in)
1966
45.7 mm (1.8 in)
1967
81.2 mm (3.2 in)
1968
114.2 mm (4.5 in)
1969
88.1 mm (3.5 in)
1970
62.7 mm (2.5 in)
1971
87.6 mm (3.4 in)
1972
41.0 mm (1.6 in)
1973
52.9 mm (2.1 in)
1974
41.7 mm (1.6 in)
1975
46.3 mm (1.8 in)
1976
20.3 mm (0.8 in)
1977
56.1 mm (2.2 in)
1978
57.0 mm (2.2 in)
1979
61.7 mm (2.4 in)
1980
34.3 mm (1.4 in)
1981
57.2 mm (2.3 in)
1982
91.4 mm (3.6 in)
1983
52.0 mm (2.0 in)
1984
95.5 mm (3.8 in)
1985
29.7 mm (1.2 in)
1986
45.5 mm (1.8 in)
1987
43.7 mm (1.7 in)
1988
70.4 mm (2.8 in)
1989
71.9 mm (2.8 in)
1990
46.0 mm (1.8 in)
1991
87.8 mm (3.5 in)
1992
46.0 mm (1.8 in)
1993
30.8 mm (1.2 in)
1994
20.6 mm (0.8 in)
1995
65.3 mm (2.6 in)
1996
72.4 mm (2.9 in)
1997
58.4 mm (2.3 in)
1998
33.3 mm (1.3 in)
1999
136.2 mm (5.4 in)
2000
43.9 mm (1.7 in)
2001
52.6 mm (2.1 in)
2002
35.0 mm (1.4 in)
2003
25.9 mm (1.0 in)
2004
30.0 mm (1.2 in)
2005
26.4 mm (1.0 in)
2006
12.5 mm (0.5 in)
2007
27.5 mm (1.1 in)
2009
55.1 mm (2.2 in)
2010
58.9 mm (2.3 in)
2011
74.9 mm (2.9 in)
2012
45.7 mm (1.8 in)
2013
52.4 mm (2.1 in)
2018
25.2 mm (1.0 in)
2019
80.5 mm (3.2 in)
2020
37.3 mm (1.5 in)
2021
39.9 mm (1.6 in)
2022
69.8 mm (2.7 in)
2023
55.6 mm (2.2 in)
2024
40.7 mm (1.6 in)
2025
111.6 mm (4.4 in)
2026
42.7 mm (1.7 in)
Longest dry spell (CDD)
The longest dry spell of the year at Oahe Dam, 1960 to 2026. The record is 83 days in 1964, marked on the chart; the median year is 39 days.
Longest dry spell (CDD) at Oahe Dam by year
Year
Longest dry spell (CDD)
1960
25 days
1961
40 days
1962
29 days
1963
37 days
1964
83 days
1965
37 days
1966
34 days
1967
64 days
1968
48 days
1969
34 days
1970
22 days
1971
27 days
1972
62 days
1973
43 days
1974
36 days
1975
49 days
1976
41 days
1977
37 days
1978
30 days
1979
44 days
1980
36 days
1981
46 days
1982
41 days
1983
63 days
1984
63 days
1985
35 days
1986
44 days
1987
72 days
1988
75 days
1989
26 days
1990
61 days
1991
48 days
1992
38 days
1993
26 days
1994
28 days
1995
34 days
1996
32 days
1997
31 days
1998
38 days
1999
48 days
2000
46 days
2001
44 days
2002
56 days
2003
43 days
2004
44 days
2005
37 days
2006
78 days
2007
28 days
2009
39 days
2010
44 days
2011
5 days
2012
30 days
2013
5 days
2018
25 days
2019
30 days
2020
33 days
2021
51 days
2022
54 days
2023
42 days
2024
46 days
2025
22 days
2026
31 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 Oahe Dam falls on 2 May and the median first autumn frost on 9 October, which leaves a median of 162 days between them.
Fitted over all years, the growing season changes by +0.9 days per decade at this station.
Frost dates and growing season at Oahe Dam
Measure
Median, all years
Earliest period
Recent period (1966 to 2025)
Recent against earliest
Fitted trend
Last spring frost
2 May
n/a
3 May
n/a
-0.9 days per decade
First autumn frost
9 October
n/a
9 October
n/a
-0.1 days per decade
Growing days
162 days
n/a
162 days
n/a
+0.9 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
37 years, 1961 to 2023
A day with at least 38.4 mm (1.5 in) of rain is expected about once in 2 years. A day with at least 88.6 mm (3.5 in) of rain is expected about once in 100 years.
Rainfall return levels at Oahe 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
38.4 mm (1.5 in)
5 years
51.9 mm (2.0 in)
10 years
60.8 mm (2.4 in)
25 years
72.1 mm (2.8 in)
50 years
80.4 mm (3.2 in)
Longer than the 37 years of record
100 years
88.6 mm (3.5 in)
Longer than the 37 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, 37 years of values from 1961 to 2023.
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: 86.4 mm (3.4 in) in 1984; 66.8 mm (2.6 in) in 1989; 65.3 mm (2.6 in) in 1988.
Download the Data
Data for Oahe Dam standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Oahe 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 2026-10-14 (14 October 2026). Records are computed by this site and are not official.