Record envelope, standing records and threshold days for Yellowtail Dam (USC00249240), Montana, United States, with 79 years of record.
Key Facts for Yellowtail Dam
Yellowtail Dam (USC00249240) is a weather station in Montana, United States at 45.31 latitude and -107.94 longitude, 1,007 m (3,305 ft) above sea level.
The station reports from 1948 to 2026, 79 years of record.
1,464 records set at Yellowtail Dam still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Yellowtail Dam set a daily record snow depth of 5.1 cm (2.0 in) on 27 April 2026.
About the Station
Location: Montana, United States, 45.31 latitude, -107.94 longitude.
Elevation: 1,007 m (3,305 ft).
Period of record: 1948 to 2026, 79 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 Yellowtail 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 Yellowtail Dam, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
21.7 C (71.1 F)
-34.4 C (-29.9 F)
n/a
n/a
Feb
22.2 C (72.0 F)
-35.6 C (-32.1 F)
n/a
n/a
Mar
27.8 C (82.0 F)
-28.9 C (-20.0 F)
n/a
n/a
Apr
31.7 C (89.1 F)
-15.6 C (3.9 F)
n/a
n/a
May
36.7 C (98.1 F)
-6.1 C (21.0 F)
n/a
n/a
Jun
41.7 C (107.1 F)
-0.6 C (30.9 F)
n/a
n/a
Jul
43.3 C (109.9 F)
0.0 C (32.0 F)
n/a
n/a
Aug
41.7 C (107.1 F)
1.7 C (35.1 F)
n/a
n/a
Sep
40.0 C (104.0 F)
-6.7 C (19.9 F)
n/a
n/a
Oct
34.4 C (93.9 F)
-23.9 C (-11.0 F)
n/a
n/a
Nov
25.6 C (78.1 F)
-25.6 C (-14.1 F)
n/a
n/a
Dec
22.2 C (72.0 F)
-38.9 C (-38.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Yellowtail Dam still stand. 1965 holds the most, with 43.
Standing records at Yellowtail Dam by the year they were set
Year set
Standing records
1948
37
1949
29
1950
34
1951
33
1952
12
1962
1
1963
30
1964
24
1965
43
1966
19
1967
18
1968
19
1969
27
1970
11
1971
19
1972
29
1973
18
1974
24
1975
17
1976
14
1977
15
1978
12
1979
18
1980
25
1981
17
1982
17
1983
34
1984
26
1985
40
1986
34
1987
26
1988
37
1989
27
1990
28
1991
23
1992
37
1993
18
1994
16
1995
27
1996
30
1997
19
1998
8
1999
21
2000
14
2001
12
2002
29
2003
27
2004
15
2005
24
2006
12
2007
9
2008
33
2009
25
2010
12
2011
6
2012
20
2013
13
2014
30
2015
20
2016
12
2017
16
2018
13
2019
24
2020
31
2021
20
2022
27
2023
7
All-Time Record Progression
8 new records
8 all-time records were set at Yellowtail Dam between 7 May 1988 and 21 December 2022. Each dot is a new record.
When Yellowtail Dam set new all-time records
Date
Kind
Detail
1988-05-07
Record daily precipitation
Record daily precipitation 127.0 mm (5.0 in)
1989-02-02
Record low maximum temperature
Record low maximum temperature -28.9 C (-20.0 F)
1989-02-02
Record low minimum temperature
Record low minimum temperature -33.9 C (-29.0 F)
1989-02-03
Record low minimum temperature
Record low minimum temperature -35.6 C (-32.1 F)
2002-07-06
Record high maximum temperature
Record high maximum temperature 42.8 C (109.0 F)
2002-07-07
Record high maximum temperature
Record high maximum temperature 43.3 C (109.9 F)
2002-07-25
Record high minimum temperature
Record high minimum temperature 28.3 C (82.9 F)
2022-12-21
Record low minimum temperature
Record low minimum temperature -38.9 C (-38.0 F)
Wettest Day of Each Month
May: 127.0 mm (5.0 in)
The wettest day on record for each calendar month at Yellowtail Dam. The most was 127.0 mm (5.0 in) on 7 May 1988.
Record daily precipitation for each month at Yellowtail Dam
Month
Record daily precipitation (mm)
Date
Jan
23.9 mm (0.9 in)
6 January 2014
Feb
31.8 mm (1.3 in)
29 February 2004
Mar
43.9 mm (1.7 in)
31 March 2014
Apr
81.5 mm (3.2 in)
26 April 1964
May
127.0 mm (5.0 in)
7 May 1988
Jun
110.2 mm (4.3 in)
6 June 2007
Jul
115.8 mm (4.6 in)
25 July 1981
Aug
59.4 mm (2.3 in)
29 August 1964
Sep
53.6 mm (2.1 in)
18 September 1978
Oct
60.7 mm (2.4 in)
31 October 1974
Nov
27.7 mm (1.1 in)
9 November 1978
Dec
21.3 mm (0.8 in)
3 December 2013
Period of Record Coverage
1948 to 2023
Complete yearUnder 90 percent of days
67 years of record at Yellowtail Dam, 1948 to 2023. 13 years have data for under 90 percent of days and are left out of rankings: 1948, 1950, 1951, 1952, 1962, 1998, 1999, 2000 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 56 complete years at Yellowtail Dam, 1949 to 2021. Blue stripes are years cooler than the station's own mean of 10.2 C (50.3 F); red stripes are warmer. The coolest year was 2019, at 8.1 C (46.7 F), and the warmest was 1988, at 12.1 C (53.7 F). The strongest colour marks a difference of 2.1 C (3.8 F).
Annual mean temperature at Yellowtail Dam as warming stripes, 1949 to 2021
Year
Annual mean temperature
Difference from the station mean
1949
8.8 C
-1.40 C
1963
10.8 C
+0.60 C
1964
9.5 C
-0.69 C
1965
9.2 C
-1.03 C
1966
9.7 C
-0.50 C
1967
9.8 C
-0.43 C
1968
9.7 C
-0.50 C
1969
8.7 C
-1.45 C
1970
9.2 C
-0.96 C
1971
9.6 C
-0.59 C
1972
9.6 C
-0.64 C
1973
10.5 C
+0.26 C
1974
11.0 C
+0.81 C
1975
8.8 C
-1.41 C
1976
11.1 C
+0.93 C
1977
10.5 C
+0.35 C
1978
8.6 C
-1.59 C
1979
10.0 C
-0.15 C
1980
10.8 C
+0.60 C
1981
11.9 C
+1.68 C
1982
9.5 C
-0.74 C
1983
10.7 C
+0.51 C
1984
10.7 C
+0.54 C
1985
9.5 C
-0.74 C
1986
11.2 C
+1.03 C
1987
11.7 C
+1.46 C
1988
12.1 C
+1.87 C
1989
10.1 C
-0.05 C
1990
11.3 C
+1.08 C
1991
11.2 C
+1.05 C
1992
11.7 C
+1.55 C
1993
9.8 C
-0.44 C
1994
11.5 C
+1.28 C
1995
10.6 C
+0.39 C
1996
9.2 C
-1.00 C
1997
10.5 C
+0.35 C
1998
11.1 C
+0.91 C
2001
11.0 C
+0.77 C
2002
10.2 C
-0.01 C
2003
11.1 C
+0.95 C
2004
10.7 C
+0.52 C
2005
10.1 C
-0.13 C
2006
10.8 C
+0.63 C
2007
10.7 C
+0.51 C
2008
8.5 C
-1.65 C
2009
8.7 C
-1.50 C
2010
8.9 C
-1.33 C
2011
9.5 C
-0.70 C
2012
11.2 C
+0.98 C
2013
9.5 C
-0.65 C
2014
9.1 C
-1.14 C
2015
10.7 C
+0.46 C
2016
11.1 C
+0.86 C
2019
8.1 C
-2.05 C
2020
10.4 C
+0.17 C
2021
10.4 C
+0.20 C
The fitted trend in annual mean temperature here over 1949 to 2021 is 0.1 C (-0.1 to 0.2) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.1 F (-0.2 to 0.4) per decade. The slope is a straight line fitted to 56 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Yellowtail Dam
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.1 C (-0.1 to 0.2) per decade
0.1 F (-0.2 to 0.4) per decade
1949 to 2021
56
Not clearly different from zero
Mean daily maximum
-0.1 C (-0.3 to 0.1) per decade
-0.2 F (-0.5 to 0.1) per decade
1949 to 2021
56
Not clearly different from zero
Mean daily minimum
0.2 C (0.1 to 0.4) per decade
0.4 F (0.1 to 0.6) per decade
1949 to 2021
56
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 2026
Yearly extremes at Yellowtail Dam: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
43.3 C (109.9 F)
2002
39.4 C (102.9 F)
67
Coldest night (TNn)
-38.9 C (-38.0 F)
2022
-26.1 C (-15.0 F)
67
Wettest day (Rx1day)
127.0 mm (5.0 in)
1988
36.7 mm (1.4 in)
70
Wettest five days (Rx5day)
150.1 mm (5.9 in)
1963
54.1 mm (2.1 in)
69
Longest dry spell (CDD)
57 days
1964
28 days
70
Hottest day (TXx)
The hottest day of the year at Yellowtail Dam, 1948 to 2026. The record is 43.3 C (109.9 F) in 2002, marked on the chart; the median year is 39.4 C (102.9 F).
Hottest day (TXx) at Yellowtail Dam by year
Year
Hottest day (TXx)
1948
39.4 C (102.9 F)
1949
41.7 C (107.1 F)
1950
40.0 C (104.0 F)
1951
37.8 C (100.0 F)
1952
38.3 C (100.9 F)
1962
19.4 C (66.9 F)
1963
39.4 C (102.9 F)
1964
40.0 C (104.0 F)
1965
40.6 C (105.1 F)
1966
41.1 C (106.0 F)
1967
38.3 C (100.9 F)
1968
36.7 C (98.1 F)
1969
40.0 C (104.0 F)
1970
39.4 C (102.9 F)
1971
40.0 C (104.0 F)
1972
37.8 C (100.0 F)
1973
39.4 C (102.9 F)
1974
37.8 C (100.0 F)
1975
39.4 C (102.9 F)
1976
39.4 C (102.9 F)
1977
41.1 C (106.0 F)
1978
38.3 C (100.9 F)
1979
38.3 C (100.9 F)
1980
40.0 C (104.0 F)
1981
37.2 C (99.0 F)
1982
37.2 C (99.0 F)
1983
40.6 C (105.1 F)
1984
39.4 C (102.9 F)
1985
40.0 C (104.0 F)
1986
38.3 C (100.9 F)
1987
37.2 C (99.0 F)
1988
40.6 C (105.1 F)
1989
41.7 C (107.1 F)
1990
40.0 C (104.0 F)
1991
41.1 C (106.0 F)
1992
37.2 C (99.0 F)
1993
35.6 C (96.1 F)
1994
38.9 C (102.0 F)
1995
41.7 C (107.1 F)
1996
40.0 C (104.0 F)
1997
36.7 C (98.1 F)
1998
41.1 C (106.0 F)
1999
40.6 C (105.1 F)
2000
38.3 C (100.9 F)
2001
41.1 C (106.0 F)
2002
43.3 C (109.9 F)
2003
41.1 C (106.0 F)
2004
38.9 C (102.0 F)
2005
42.8 C (109.0 F)
2006
40.6 C (105.1 F)
2007
41.1 C (106.0 F)
2008
40.6 C (105.1 F)
2009
37.8 C (100.0 F)
2010
38.9 C (102.0 F)
2011
38.9 C (102.0 F)
2012
41.1 C (106.0 F)
2013
36.7 C (98.1 F)
2014
39.4 C (102.9 F)
2015
40.0 C (104.0 F)
2016
38.9 C (102.0 F)
2017
39.4 C (102.9 F)
2018
38.9 C (102.0 F)
2019
36.7 C (98.1 F)
2020
38.9 C (102.0 F)
2021
41.7 C (107.1 F)
2022
41.1 C (106.0 F)
2023
17.8 C (64.0 F)
2024
n/a
2025
n/a
2026
n/a
Coldest night (TNn)
The coldest night of the year at Yellowtail Dam, 1948 to 2026. The record is -38.9 C (-38.0 F) in 2022, marked on the chart; the median year is -26.1 C (-15.0 F).
Coldest night (TNn) at Yellowtail Dam by year
Year
Coldest night (TNn)
1948
-20.6 C (-5.1 F)
1949
-32.8 C (-27.0 F)
1950
-31.1 C (-24.0 F)
1951
-23.9 C (-11.0 F)
1952
-28.3 C (-18.9 F)
1962
-20.0 C (-4.0 F)
1963
-32.8 C (-27.0 F)
1964
-32.2 C (-26.0 F)
1965
-27.2 C (-17.0 F)
1966
-27.2 C (-17.0 F)
1967
-26.1 C (-15.0 F)
1968
-31.1 C (-24.0 F)
1969
-29.4 C (-20.9 F)
1970
-24.4 C (-11.9 F)
1971
-27.8 C (-18.0 F)
1972
-31.7 C (-25.1 F)
1973
-27.8 C (-18.0 F)
1974
-26.1 C (-15.0 F)
1975
-25.6 C (-14.1 F)
1976
-23.9 C (-11.0 F)
1977
-27.8 C (-18.0 F)
1978
-25.0 C (-13.0 F)
1979
-26.7 C (-16.1 F)
1980
-27.2 C (-17.0 F)
1981
-26.1 C (-15.0 F)
1982
-27.2 C (-17.0 F)
1983
-32.8 C (-27.0 F)
1984
-25.6 C (-14.1 F)
1985
-27.2 C (-17.0 F)
1986
-24.4 C (-11.9 F)
1987
-21.1 C (-6.0 F)
1988
-25.6 C (-14.1 F)
1989
-35.6 C (-32.1 F)
1990
-33.3 C (-27.9 F)
1991
-26.1 C (-15.0 F)
1992
-24.4 C (-11.9 F)
1993
-26.1 C (-15.0 F)
1994
-25.0 C (-13.0 F)
1995
-26.1 C (-15.0 F)
1996
-31.7 C (-25.1 F)
1997
-34.4 C (-29.9 F)
1998
-26.1 C (-15.0 F)
1999
-13.9 C (7.0 F)
2000
-23.3 C (-9.9 F)
2001
-22.2 C (-8.0 F)
2002
-19.4 C (-2.9 F)
2003
-27.2 C (-17.0 F)
2004
-25.6 C (-14.1 F)
2005
-26.7 C (-16.1 F)
2006
-25.6 C (-14.1 F)
2007
-25.6 C (-14.1 F)
2008
-28.9 C (-20.0 F)
2009
-25.0 C (-13.0 F)
2010
-27.8 C (-18.0 F)
2011
-27.8 C (-18.0 F)
2012
-22.8 C (-9.0 F)
2013
-29.4 C (-20.9 F)
2014
-30.0 C (-22.0 F)
2015
-20.6 C (-5.1 F)
2016
-26.1 C (-15.0 F)
2017
-23.9 C (-11.0 F)
2018
-25.0 C (-13.0 F)
2019
-28.9 C (-20.0 F)
2020
-23.9 C (-11.0 F)
2021
-30.0 C (-22.0 F)
2022
-38.9 C (-38.0 F)
2023
-27.2 C (-17.0 F)
2024
n/a
2025
n/a
2026
n/a
Wettest day (Rx1day)
The wettest day of the year at Yellowtail Dam, 1948 to 2026. The record is 127.0 mm (5.0 in) in 1988, marked on the chart; the median year is 36.7 mm (1.4 in).
Wettest day (Rx1day) at Yellowtail Dam by year
Year
Wettest day (Rx1day)
1948
19.1 mm (0.8 in)
1949
22.9 mm (0.9 in)
1950
25.4 mm (1.0 in)
1951
25.1 mm (1.0 in)
1952
36.6 mm (1.4 in)
1962
7.1 mm (0.28 in)
1963
74.4 mm (2.9 in)
1964
81.5 mm (3.2 in)
1965
33.5 mm (1.3 in)
1966
25.9 mm (1.0 in)
1967
42.7 mm (1.7 in)
1968
29.5 mm (1.2 in)
1969
40.4 mm (1.6 in)
1970
36.8 mm (1.4 in)
1971
45.5 mm (1.8 in)
1972
38.1 mm (1.5 in)
1973
34.0 mm (1.3 in)
1974
60.7 mm (2.4 in)
1975
46.2 mm (1.8 in)
1976
46.2 mm (1.8 in)
1977
24.4 mm (1.0 in)
1978
93.5 mm (3.7 in)
1979
26.2 mm (1.0 in)
1980
33.0 mm (1.3 in)
1981
115.8 mm (4.6 in)
1982
56.9 mm (2.2 in)
1983
25.9 mm (1.0 in)
1984
30.5 mm (1.2 in)
1985
25.4 mm (1.0 in)
1986
23.6 mm (0.9 in)
1987
26.9 mm (1.1 in)
1988
127.0 mm (5.0 in)
1989
29.5 mm (1.2 in)
1990
29.0 mm (1.1 in)
1991
40.6 mm (1.6 in)
1992
63.5 mm (2.5 in)
1993
55.1 mm (2.2 in)
1994
44.5 mm (1.8 in)
1995
25.9 mm (1.0 in)
1996
45.7 mm (1.8 in)
1997
44.7 mm (1.8 in)
1998
28.4 mm (1.1 in)
1999
16.8 mm (0.7 in)
2000
36.6 mm (1.4 in)
2001
49.5 mm (1.9 in)
2002
33.8 mm (1.3 in)
2003
33.5 mm (1.3 in)
2004
31.8 mm (1.3 in)
2005
32.0 mm (1.3 in)
2006
50.3 mm (2.0 in)
2007
110.2 mm (4.3 in)
2008
47.8 mm (1.9 in)
2009
33.3 mm (1.3 in)
2010
33.5 mm (1.3 in)
2011
44.2 mm (1.7 in)
2012
26.7 mm (1.1 in)
2013
44.5 mm (1.8 in)
2014
43.9 mm (1.7 in)
2015
39.6 mm (1.6 in)
2016
50.8 mm (2.0 in)
2017
27.4 mm (1.1 in)
2018
49.0 mm (1.9 in)
2019
43.7 mm (1.7 in)
2020
30.2 mm (1.2 in)
2021
25.4 mm (1.0 in)
2022
40.9 mm (1.6 in)
2023
53.3 mm (2.1 in)
2024
41.9 mm (1.6 in)
2025
43.7 mm (1.7 in)
2026
29.0 mm (1.1 in)
Wettest five days (Rx5day)
The wettest five days of the year at Yellowtail Dam, 1948 to 2026. The record is 150.1 mm (5.9 in) in 1963, marked on the chart; the median year is 54.1 mm (2.1 in).
Wettest five days (Rx5day) at Yellowtail Dam by year
Year
Wettest five days (Rx5day)
1948
25.9 mm (1.0 in)
1949
38.6 mm (1.5 in)
1950
35.3 mm (1.4 in)
1951
51.5 mm (2.0 in)
1952
52.1 mm (2.1 in)
1962
7.6 mm (0.30 in)
1963
150.1 mm (5.9 in)
1964
129.3 mm (5.1 in)
1965
85.8 mm (3.4 in)
1966
27.4 mm (1.1 in)
1967
115.1 mm (4.5 in)
1968
62.5 mm (2.5 in)
1969
80.5 mm (3.2 in)
1970
55.7 mm (2.2 in)
1971
76.0 mm (3.0 in)
1972
41.9 mm (1.6 in)
1973
49.8 mm (2.0 in)
1974
90.8 mm (3.6 in)
1975
80.7 mm (3.2 in)
1976
57.9 mm (2.3 in)
1977
39.2 mm (1.5 in)
1978
137.2 mm (5.4 in)
1979
39.6 mm (1.6 in)
1980
38.3 mm (1.5 in)
1981
131.0 mm (5.2 in)
1982
87.4 mm (3.4 in)
1983
42.6 mm (1.7 in)
1984
61.9 mm (2.4 in)
1985
40.4 mm (1.6 in)
1986
57.4 mm (2.3 in)
1987
56.7 mm (2.2 in)
1988
133.4 mm (5.3 in)
1989
42.1 mm (1.7 in)
1990
38.6 mm (1.5 in)
1991
79.5 mm (3.1 in)
1992
135.4 mm (5.3 in)
1993
67.3 mm (2.6 in)
1994
48.6 mm (1.9 in)
1995
55.9 mm (2.2 in)
1996
54.4 mm (2.1 in)
1997
57.6 mm (2.3 in)
1998
45.5 mm (1.8 in)
1999
23.4 mm (0.9 in)
2000
46.9 mm (1.8 in)
2001
52.0 mm (2.0 in)
2002
36.1 mm (1.4 in)
2003
39.1 mm (1.5 in)
2004
43.7 mm (1.7 in)
2005
54.1 mm (2.1 in)
2006
74.0 mm (2.9 in)
2007
113.0 mm (4.4 in)
2008
64.3 mm (2.5 in)
2009
42.2 mm (1.7 in)
2010
68.1 mm (2.7 in)
2011
7.9 mm (0.31 in)
2012
9.9 mm (0.39 in)
2013
47.0 mm (1.9 in)
2014
51.0 mm (2.0 in)
2015
39.6 mm (1.6 in)
2016
54.9 mm (2.2 in)
2017
68.2 mm (2.7 in)
2018
58.4 mm (2.3 in)
2019
59.5 mm (2.3 in)
2020
74.3 mm (2.9 in)
2021
44.9 mm (1.8 in)
2022
53.3 mm (2.1 in)
2023
83.6 mm (3.3 in)
2024
41.9 mm (1.6 in)
2025
43.7 mm (1.7 in)
2026
n/a
Longest dry spell (CDD)
The longest dry spell of the year at Yellowtail Dam, 1948 to 2026. The record is 57 days in 1964, marked on the chart; the median year is 28 days.
Longest dry spell (CDD) at Yellowtail Dam by year
Year
Longest dry spell (CDD)
1948
39 days
1949
29 days
1950
41 days
1951
24 days
1952
22 days
1962
22 days
1963
30 days
1964
57 days
1965
27 days
1966
18 days
1967
25 days
1968
16 days
1969
38 days
1970
33 days
1971
35 days
1972
24 days
1973
27 days
1974
24 days
1975
25 days
1976
32 days
1977
24 days
1978
28 days
1979
22 days
1980
20 days
1981
27 days
1982
19 days
1983
20 days
1984
32 days
1985
23 days
1986
27 days
1987
28 days
1988
32 days
1989
20 days
1990
30 days
1991
23 days
1992
48 days
1993
23 days
1994
39 days
1995
21 days
1996
21 days
1997
18 days
1998
35 days
1999
25 days
2000
33 days
2001
48 days
2002
26 days
2003
31 days
2004
23 days
2005
28 days
2006
44 days
2007
46 days
2008
33 days
2009
42 days
2010
32 days
2011
12 days
2012
48 days
2013
17 days
2014
17 days
2015
22 days
2016
27 days
2017
47 days
2018
36 days
2019
23 days
2020
50 days
2021
33 days
2022
41 days
2023
37 days
2024
32 days
2025
32 days
2026
4 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
56 years with a frost
Across 56 years with a frost, the median last spring frost at Yellowtail Dam falls on 6 May and the median first autumn frost on 6 October, which leaves a median of 153 days between them.
Fitted over all years, the growing season changes by +0.3 days per decade at this station.
Frost dates and growing season at Yellowtail Dam
Measure
Median, all years
Earliest period
Recent period (1988 to 2021)
Recent against earliest
Fitted trend
Last spring frost
6 May
n/a
7 May
n/a
+1.5 days per decade
First autumn frost
6 October
n/a
5 October
n/a
+1.8 days per decade
Growing days
153 days
n/a
147 days
n/a
+0.3 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
58 years, 1949 to 2024
A day with at least 37.0 mm (1.5 in) of rain is expected about once in 2 years. A day with at least 142.5 mm (5.6 in) of rain is expected about once in 100 years.
Rainfall return levels at Yellowtail 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
37.0 mm (1.5 in)
5 years
53.5 mm (2.1 in)
10 years
68.0 mm (2.7 in)
25 years
91.8 mm (3.6 in)
50 years
114.5 mm (4.5 in)
100 years
142.5 mm (5.6 in)
Longer than the 58 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, 58 years of values from 1949 to 2024.
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: 127.0 mm (5.0 in) in 1988; 115.8 mm (4.6 in) in 1981; 110.2 mm (4.3 in) in 2007.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Climate Twins
2005 to 2021 against 1961 to 1990
Over 2005 to 2021, Yellowtail Dam had a mean temperature of 9.8 C (49.7 F) and 405.6 mm (16.0 in) of rain a year. The 3 stations whose 1961 to 1990 climate was closest to that are Flagler 1S (United States, 781 km away), Johnson Pass (United States, 672 km away) and Denver-Stapleton (United States, 666 km away).
Climate twins of Yellowtail Dam: stations whose 1961 to 1990 climate is closest to its 2005 to 2021 climate
Twins are stations, not cities. A twin is one of the three stations at least 100 km away whose earlier climate is closest to this station's recent one, so a close match does not mean the two places look alike in other ways. A station move or a gap in a record can change that station's averages. The list describes past climate; it is not a forecast and does not say what caused any change. How twins are found, and a search for any station.
Download the Data
Data for Yellowtail Dam standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Yellowtail 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.