Record envelope, standing records and threshold days for Seminoe Dam (USC00488070), Wyoming, United States, with 64 years of record.
Key Facts for Seminoe Dam
Seminoe Dam (USC00488070) is a weather station in Wyoming, United States at 42.16 latitude and -106.92 longitude, 2,084 m (6,838 ft) above sea level.
The station reports from 1948 to 2011, 64 years of record.
1,464 records set at Seminoe Dam still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Seminoe Dam set a daily record high maximum temperature of 33.9 C (93.0 F) on 29 August 2011.
About the Station
Location: Wyoming, United States, 42.16 latitude, -106.92 longitude.
Elevation: 2,084 m (6,838 ft).
Period of record: 1948 to 2011, 64 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 Seminoe 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 Seminoe Dam, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
12.2 C (54.0 F)
-36.1 C (-33.0 F)
n/a
n/a
Feb
15.6 C (60.1 F)
-36.7 C (-34.1 F)
n/a
n/a
Mar
21.7 C (71.1 F)
-26.7 C (-16.1 F)
n/a
n/a
Apr
27.8 C (82.0 F)
-26.7 C (-16.1 F)
n/a
n/a
May
30.6 C (87.1 F)
-11.1 C (12.0 F)
n/a
n/a
Jun
35.6 C (96.1 F)
-7.2 C (19.0 F)
n/a
n/a
Jul
36.7 C (98.1 F)
0.0 C (32.0 F)
n/a
n/a
Aug
36.7 C (98.1 F)
-0.6 C (30.9 F)
n/a
n/a
Sep
32.8 C (91.0 F)
-11.7 C (10.9 F)
n/a
n/a
Oct
27.8 C (82.0 F)
-21.7 C (-7.1 F)
n/a
n/a
Nov
18.3 C (64.9 F)
-25.6 C (-14.1 F)
n/a
n/a
Dec
16.7 C (62.1 F)
-36.1 C (-33.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Seminoe Dam still stand. 2003 holds the most, with 53.
Standing records at Seminoe Dam by the year they were set
Year set
Standing records
1948
11
1949
30
1950
42
1951
37
1952
34
1953
28
1954
34
1955
30
1956
29
1957
15
1958
18
1959
48
1960
22
1961
16
1962
40
1963
41
1964
16
1965
39
1966
27
1967
27
1968
16
1969
47
1970
26
1971
29
1972
33
1973
19
1974
26
1975
26
1976
14
1977
23
1978
31
1979
30
1980
24
1981
31
1982
17
1983
32
1984
25
1985
42
1986
35
1987
34
1988
24
1989
43
1990
42
1991
9
2002
22
2003
53
2004
21
2005
16
2006
27
2007
21
2008
6
2009
20
2010
13
2011
3
All-Time Record Progression
3 new records
3 all-time records were set at Seminoe Dam between 26 July 1985 and 3 February 1989. Each dot is a new record.
When Seminoe Dam set new all-time records
Date
Kind
Detail
1985-07-26
Record high minimum temperature
Record high minimum temperature 25.0 C (77.0 F)
1989-02-02
Record low minimum temperature
Record low minimum temperature -36.7 C (-34.1 F)
1989-02-03
Record low maximum temperature
Record low maximum temperature -29.4 C (-20.9 F)
Wettest Day of Each Month
May: 94.0 mm (3.7 in)
The wettest day on record for each calendar month at Seminoe Dam. The most was 94.0 mm (3.7 in) on 14 May 1965.
Record daily precipitation for each month at Seminoe Dam
Month
Record daily precipitation (mm)
Date
Jan
17.8 mm (0.7 in)
27 January 1975
Feb
22.4 mm (0.9 in)
27 February 2006
Mar
54.1 mm (2.1 in)
20 March 2003
Apr
34.0 mm (1.3 in)
12 April 2004
May
94.0 mm (3.7 in)
14 May 1965
Jun
50.5 mm (2.0 in)
12 June 1970
Jul
48.0 mm (1.9 in)
5 July 1975
Aug
33.8 mm (1.3 in)
17 August 1960
Sep
38.9 mm (1.5 in)
11 September 1973
Oct
53.1 mm (2.1 in)
6 October 1962
Nov
34.0 mm (1.3 in)
3 November 2003
Dec
17.8 mm (0.7 in)
29 December 1972
Period of Record Coverage
1948 to 2011
Complete yearUnder 90 percent of days
54 years of record at Seminoe Dam, 1948 to 2011. 18 years have data for under 90 percent of days and are left out of rankings: 1948, 1956, 1957, 1964, 1973, 1974, 1975, 1988 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 33 complete years at Seminoe Dam, 1949 to 2005. Blue stripes are years cooler than the station's own mean of 6.5 C (43.6 F); red stripes are warmer. The coolest year was 1951, at 4.9 C (40.9 F), and the warmest was 1981, at 7.9 C (46.3 F). The strongest colour marks a difference of 1.6 C (2.9 F).
Annual mean temperature at Seminoe Dam as warming stripes, 1949 to 2005
Year
Annual mean temperature
Difference from the station mean
1949
5.6 C
-0.88 C
1950
6.0 C
-0.43 C
1951
4.9 C
-1.53 C
1952
6.4 C
-0.02 C
1953
7.0 C
+0.57 C
1954
7.8 C
+1.30 C
1955
6.0 C
-0.50 C
1956
6.7 C
+0.26 C
1958
6.7 C
+0.27 C
1959
5.5 C
-1.01 C
1961
5.8 C
-0.69 C
1962
6.4 C
-0.02 C
1963
7.3 C
+0.79 C
1965
6.2 C
-0.27 C
1966
6.6 C
+0.17 C
1967
6.4 C
-0.11 C
1969
6.8 C
+0.37 C
1970
6.1 C
-0.35 C
1976
6.8 C
+0.29 C
1977
7.2 C
+0.72 C
1979
6.0 C
-0.46 C
1980
6.7 C
+0.24 C
1981
7.9 C
+1.47 C
1982
5.9 C
-0.54 C
1983
6.1 C
-0.37 C
1984
5.0 C
-1.43 C
1985
5.3 C
-1.14 C
1986
7.2 C
+0.72 C
1987
6.6 C
+0.17 C
1988
6.8 C
+0.31 C
2003
7.4 C
+0.93 C
2004
7.3 C
+0.85 C
2005
6.7 C
+0.25 C
The fitted trend in annual mean temperature here over 1949 to 2005 is 0.12 C (-0.04 to 0.28) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.2 F (-0.1 to 0.5) per decade. The slope is a straight line fitted to 33 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Seminoe Dam
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.12 C (-0.04 to 0.28) per decade
0.2 F (-0.1 to 0.5) per decade
1949 to 2005
33
Not clearly different from zero
Mean daily maximum
0.02 C (-0.18 to 0.22) per decade
0.04 F (-0.33 to 0.40) per decade
1949 to 2005
33
Not clearly different from zero
Mean daily minimum
0.22 C (0.05 to 0.39) per decade
0.4 F (0.1 to 0.7) per decade
1949 to 2005
33
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
1948 to 2011
Yearly extremes at Seminoe Dam: 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)
1954
33.6 C (92.5 F)
54
Coldest night (TNn)
-36.7 C (-34.1 F)
1989
-26.9 C (-16.5 F)
54
Wettest day (Rx1day)
94.0 mm (3.7 in)
1965
25.1 mm (1.0 in)
54
Wettest five days (Rx5day)
125.3 mm (4.9 in)
1991
40.3 mm (1.6 in)
54
Longest dry spell (CDD)
75 days
1962
28 days
54
Hottest day (TXx)
The hottest day of the year at Seminoe Dam, 1948 to 2011. The record is 36.7 C (98.1 F) in 1954, marked on the chart; the median year is 33.6 C (92.5 F).
Hottest day (TXx) at Seminoe Dam by year
Year
Hottest day (TXx)
1948
32.2 C (90.0 F)
1949
33.3 C (91.9 F)
1950
31.1 C (88.0 F)
1951
35.0 C (95.0 F)
1952
32.8 C (91.0 F)
1953
32.8 C (91.0 F)
1954
36.7 C (98.1 F)
1955
35.0 C (95.0 F)
1956
32.2 C (90.0 F)
1957
32.2 C (90.0 F)
1958
32.2 C (90.0 F)
1959
33.9 C (93.0 F)
1960
33.9 C (93.0 F)
1961
34.4 C (93.9 F)
1962
32.2 C (90.0 F)
1963
32.8 C (91.0 F)
1964
36.7 C (98.1 F)
1965
31.7 C (89.1 F)
1966
33.3 C (91.9 F)
1967
31.7 C (89.1 F)
1968
33.3 C (91.9 F)
1969
34.4 C (93.9 F)
1970
32.2 C (90.0 F)
1971
32.8 C (91.0 F)
1972
33.9 C (93.0 F)
1973
32.8 C (91.0 F)
1974
32.2 C (90.0 F)
1975
31.7 C (89.1 F)
1976
36.1 C (97.0 F)
1977
33.3 C (91.9 F)
1978
32.2 C (90.0 F)
1979
35.6 C (96.1 F)
1980
34.4 C (93.9 F)
1981
33.9 C (93.0 F)
1982
34.4 C (93.9 F)
1983
34.4 C (93.9 F)
1984
32.8 C (91.0 F)
1985
33.3 C (91.9 F)
1986
35.6 C (96.1 F)
1987
33.3 C (91.9 F)
1988
34.4 C (93.9 F)
1989
36.1 C (97.0 F)
1990
35.0 C (95.0 F)
1991
32.8 C (91.0 F)
2002
36.7 C (98.1 F)
2003
36.7 C (98.1 F)
2004
34.4 C (93.9 F)
2005
36.7 C (98.1 F)
2006
33.9 C (93.0 F)
2007
36.1 C (97.0 F)
2008
35.0 C (95.0 F)
2009
32.2 C (90.0 F)
2010
33.3 C (91.9 F)
2011
33.9 C (93.0 F)
Coldest night (TNn)
The coldest night of the year at Seminoe Dam, 1948 to 2011. The record is -36.7 C (-34.1 F) in 1989, marked on the chart; the median year is -26.9 C (-16.5 F).
Coldest night (TNn) at Seminoe Dam by year
Year
Coldest night (TNn)
1948
-16.7 C (1.9 F)
1949
-30.0 C (-22.0 F)
1950
-32.2 C (-26.0 F)
1951
-30.0 C (-22.0 F)
1952
-22.8 C (-9.0 F)
1953
-21.7 C (-7.1 F)
1954
-23.9 C (-11.0 F)
1955
-25.6 C (-14.1 F)
1956
-25.6 C (-14.1 F)
1957
-26.7 C (-16.1 F)
1958
-19.4 C (-2.9 F)
1959
-30.0 C (-22.0 F)
1960
-26.1 C (-15.0 F)
1961
-28.3 C (-18.9 F)
1962
-32.2 C (-26.0 F)
1963
-35.0 C (-31.0 F)
1964
-30.0 C (-22.0 F)
1965
-25.0 C (-13.0 F)
1966
-23.9 C (-11.0 F)
1967
-24.4 C (-11.9 F)
1968
-26.1 C (-15.0 F)
1969
-22.2 C (-8.0 F)
1970
-24.4 C (-11.9 F)
1971
-26.1 C (-15.0 F)
1972
-28.3 C (-18.9 F)
1973
-32.2 C (-26.0 F)
1974
-36.1 C (-33.0 F)
1975
-27.2 C (-17.0 F)
1976
-23.9 C (-11.0 F)
1977
-26.7 C (-16.1 F)
1978
-27.8 C (-18.0 F)
1979
-31.1 C (-24.0 F)
1980
-26.1 C (-15.0 F)
1981
-28.3 C (-18.9 F)
1982
-34.4 C (-29.9 F)
1983
-32.2 C (-26.0 F)
1984
-30.0 C (-22.0 F)
1985
-35.0 C (-31.0 F)
1986
-22.8 C (-9.0 F)
1987
-28.3 C (-18.9 F)
1988
-26.7 C (-16.1 F)
1989
-36.7 C (-34.1 F)
1990
-36.1 C (-33.0 F)
1991
-26.1 C (-15.0 F)
2002
-24.4 C (-11.9 F)
2003
-26.1 C (-15.0 F)
2004
-21.7 C (-7.1 F)
2005
-24.4 C (-11.9 F)
2006
-28.9 C (-20.0 F)
2007
-25.6 C (-14.1 F)
2008
-29.4 C (-20.9 F)
2009
-27.2 C (-17.0 F)
2010
-28.3 C (-18.9 F)
2011
-34.4 C (-29.9 F)
Wettest day (Rx1day)
The wettest day of the year at Seminoe Dam, 1948 to 2011. The record is 94.0 mm (3.7 in) in 1965, marked on the chart; the median year is 25.1 mm (1.0 in).
Wettest day (Rx1day) at Seminoe Dam by year
Year
Wettest day (Rx1day)
1948
14.0 mm (0.6 in)
1949
23.4 mm (0.9 in)
1950
26.7 mm (1.1 in)
1951
15.2 mm (0.6 in)
1952
21.6 mm (0.9 in)
1953
29.2 mm (1.1 in)
1954
15.2 mm (0.6 in)
1955
12.4 mm (0.5 in)
1956
35.3 mm (1.4 in)
1957
21.3 mm (0.8 in)
1958
27.4 mm (1.1 in)
1959
20.1 mm (0.8 in)
1960
33.8 mm (1.3 in)
1961
15.0 mm (0.6 in)
1962
53.1 mm (2.1 in)
1963
26.2 mm (1.0 in)
1964
35.6 mm (1.4 in)
1965
94.0 mm (3.7 in)
1966
21.6 mm (0.9 in)
1967
21.3 mm (0.8 in)
1968
22.9 mm (0.9 in)
1969
27.2 mm (1.1 in)
1970
50.5 mm (2.0 in)
1971
31.5 mm (1.2 in)
1972
21.3 mm (0.8 in)
1973
38.9 mm (1.5 in)
1974
27.9 mm (1.1 in)
1975
48.0 mm (1.9 in)
1976
22.4 mm (0.9 in)
1977
40.1 mm (1.6 in)
1978
24.1 mm (0.9 in)
1979
31.0 mm (1.2 in)
1980
44.5 mm (1.8 in)
1981
25.1 mm (1.0 in)
1982
30.0 mm (1.2 in)
1983
19.1 mm (0.8 in)
1984
18.0 mm (0.7 in)
1985
25.4 mm (1.0 in)
1986
38.1 mm (1.5 in)
1987
18.5 mm (0.7 in)
1988
26.4 mm (1.0 in)
1989
22.9 mm (0.9 in)
1990
36.6 mm (1.4 in)
1991
90.2 mm (3.6 in)
2002
18.3 mm (0.7 in)
2003
54.1 mm (2.1 in)
2004
34.0 mm (1.3 in)
2005
21.3 mm (0.8 in)
2006
22.4 mm (0.9 in)
2007
14.0 mm (0.6 in)
2008
15.0 mm (0.6 in)
2009
17.0 mm (0.7 in)
2010
19.6 mm (0.8 in)
2011
25.1 mm (1.0 in)
Wettest five days (Rx5day)
The wettest five days of the year at Seminoe Dam, 1948 to 2011. The record is 125.3 mm (4.9 in) in 1991, marked on the chart; the median year is 40.3 mm (1.6 in).
Wettest five days (Rx5day) at Seminoe Dam by year
Year
Wettest five days (Rx5day)
1948
15.3 mm (0.6 in)
1949
28.0 mm (1.1 in)
1950
34.5 mm (1.4 in)
1951
28.4 mm (1.1 in)
1952
32.5 mm (1.3 in)
1953
48.3 mm (1.9 in)
1954
18.8 mm (0.7 in)
1955
23.0 mm (0.9 in)
1956
60.4 mm (2.4 in)
1957
49.5 mm (1.9 in)
1958
27.4 mm (1.1 in)
1959
47.8 mm (1.9 in)
1960
33.8 mm (1.3 in)
1961
27.0 mm (1.1 in)
1962
54.1 mm (2.1 in)
1963
50.1 mm (2.0 in)
1964
44.8 mm (1.8 in)
1965
95.0 mm (3.7 in)
1966
31.0 mm (1.2 in)
1967
43.9 mm (1.7 in)
1968
36.4 mm (1.4 in)
1969
50.6 mm (2.0 in)
1970
62.4 mm (2.5 in)
1971
57.9 mm (2.3 in)
1972
41.2 mm (1.6 in)
1973
45.3 mm (1.8 in)
1974
51.6 mm (2.0 in)
1975
52.3 mm (2.1 in)
1976
35.3 mm (1.4 in)
1977
44.9 mm (1.8 in)
1978
46.7 mm (1.8 in)
1979
47.5 mm (1.9 in)
1980
59.5 mm (2.3 in)
1981
42.4 mm (1.7 in)
1982
36.9 mm (1.5 in)
1983
28.2 mm (1.1 in)
1984
33.7 mm (1.3 in)
1985
29.4 mm (1.2 in)
1986
52.1 mm (2.1 in)
1987
27.1 mm (1.1 in)
1988
48.1 mm (1.9 in)
1989
39.4 mm (1.6 in)
1990
53.4 mm (2.1 in)
1991
125.3 mm (4.9 in)
2002
25.9 mm (1.0 in)
2003
54.1 mm (2.1 in)
2004
34.0 mm (1.3 in)
2005
44.2 mm (1.7 in)
2006
29.8 mm (1.2 in)
2007
25.2 mm (1.0 in)
2008
15.0 mm (0.6 in)
2009
32.7 mm (1.3 in)
2010
32.8 mm (1.3 in)
2011
0.0 mm (0.00 in)
Longest dry spell (CDD)
The longest dry spell of the year at Seminoe Dam, 1948 to 2011. The record is 75 days in 1962, marked on the chart; the median year is 28 days.
Longest dry spell (CDD) at Seminoe Dam by year
Year
Longest dry spell (CDD)
1948
40 days
1949
30 days
1950
41 days
1951
24 days
1952
47 days
1953
41 days
1954
34 days
1955
47 days
1956
41 days
1957
28 days
1958
35 days
1959
28 days
1960
23 days
1961
19 days
1962
75 days
1963
23 days
1964
41 days
1965
25 days
1966
29 days
1967
26 days
1968
25 days
1969
26 days
1970
39 days
1971
51 days
1972
28 days
1973
22 days
1974
22 days
1975
26 days
1976
38 days
1977
65 days
1978
31 days
1979
42 days
1980
28 days
1981
30 days
1982
21 days
1983
24 days
1984
20 days
1985
29 days
1986
22 days
1987
39 days
1988
37 days
1989
32 days
1990
20 days
1991
17 days
2002
28 days
2003
31 days
2004
34 days
2005
27 days
2006
38 days
2007
28 days
2008
25 days
2009
17 days
2010
21 days
2011
8 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
33 years with a frost
Across 33 years with a frost, the median last spring frost at Seminoe Dam falls on 26 May and the median first autumn frost on 22 September, which leaves a median of 119 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 Seminoe Dam
Measure
Median, all years
Earliest period
Recent period (1952 to 2005)
Recent against earliest
Fitted trend
Last spring frost
26 May
n/a
26 May
n/a
+1.3 days per decade
First autumn frost
22 September
n/a
23 September
n/a
+2.2 days per decade
Growing days
119 days
n/a
120 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
43 years, 1949 to 2006
A day with at least 25.4 mm (1.0 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 Seminoe 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
25.4 mm (1.0 in)
5 years
36.3 mm (1.4 in)
10 years
45.4 mm (1.8 in)
25 years
59.7 mm (2.4 in)
50 years
72.9 mm (2.9 in)
Longer than the 43 years of record
100 years
88.6 mm (3.5 in)
Longer than the 43 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, 43 years of values from 1949 to 2006.
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: 94.0 mm (3.7 in) in 1965; 54.1 mm (2.1 in) in 2003; 53.1 mm (2.1 in) in 1962.
Download the Data
Data for Seminoe Dam standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Seminoe 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.