Record envelope, standing records and threshold days for West Yellowstone (USC00248857), Montana, United States, with 73 years of record.
Key Facts for West Yellowstone
West Yellowstone (USC00248857) is a weather station in Montana, United States at 44.65 latitude and -111.10 longitude, 2,030 m (6,659 ft) above sea level.
The station reports from 1924 to 1996, 73 years of record.
1,464 records set at West Yellowstone still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
West Yellowstone set a daily record snowfall of 11.7 cm (4.6 in) on 29 March 1996.
About the Station
Location: Montana, United States, 44.65 latitude, -111.10 longitude.
Elevation: 2,030 m (6,659 ft).
Period of record: 1924 to 1996, 73 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 West Yellowstone. 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 West Yellowstone, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
8.3 C (46.9 F)
-51.1 C (-60.0 F)
n/a
n/a
Feb
13.3 C (55.9 F)
-54.4 C (-65.9 F)
n/a
n/a
Mar
16.1 C (61.0 F)
-41.7 C (-43.1 F)
n/a
n/a
Apr
24.4 C (75.9 F)
-32.2 C (-26.0 F)
n/a
n/a
May
31.1 C (88.0 F)
-17.8 C (0.0 F)
n/a
n/a
Jun
33.9 C (93.0 F)
-7.8 C (18.0 F)
n/a
n/a
Jul
36.1 C (97.0 F)
-6.7 C (19.9 F)
n/a
n/a
Aug
35.6 C (96.1 F)
-9.4 C (15.1 F)
n/a
n/a
Sep
32.8 C (91.0 F)
-22.8 C (-9.0 F)
n/a
n/a
Oct
28.3 C (82.9 F)
-28.9 C (-20.0 F)
n/a
n/a
Nov
17.8 C (64.0 F)
-38.9 C (-38.0 F)
n/a
n/a
Dec
12.2 C (54.0 F)
-50.6 C (-59.1 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at West Yellowstone still stand. 1934 holds the most, with 42.
Standing records at West Yellowstone by the year they were set
Year set
Standing records
1924
37
1925
13
1926
35
1927
19
1928
25
1929
35
1930
31
1931
23
1932
28
1933
32
1934
42
1935
26
1936
38
1937
26
1938
19
1939
40
1940
21
1941
13
1942
24
1943
20
1944
13
1945
13
1946
18
1947
14
1948
15
1949
15
1950
35
1951
25
1952
15
1953
13
1954
20
1955
29
1956
20
1957
13
1958
14
1959
18
1960
15
1961
15
1962
30
1963
23
1964
19
1965
19
1966
17
1967
8
1968
13
1969
17
1970
14
1971
17
1972
17
1973
5
1974
16
1975
27
1976
6
1977
14
1978
21
1979
7
1980
16
1981
20
1982
25
1983
28
1984
15
1985
18
1986
19
1987
26
1988
24
1989
14
1990
25
1991
11
1992
16
1993
12
1994
9
1995
19
1996
10
All-Time Record Progression
7 new records
7 all-time records were set at West Yellowstone between 20 February 1956 and 22 December 1983. Each dot is a new record.
When West Yellowstone set new all-time records
Date
Kind
Detail
1956-02-20
Record snow depth
Record snow depth 188.0 cm (74.0 in)
1956-03-01
Record snow depth
Record snow depth 190.5 cm (75.0 in)
1956-03-05
Record snow depth
Record snow depth 193.0 cm (76.0 in)
1957-01-20
Record daily snowfall
Record daily snowfall 43.2 cm (17.0 in)
1962-01-20
Record daily snowfall
Record daily snowfall 61.0 cm (24.0 in)
1963-01-11
Record low maximum temperature
Record low maximum temperature -26.1 C (-15.0 F)
1983-12-22
Record low maximum temperature
Record low maximum temperature -26.7 C (-16.1 F)
Wettest Day of Each Month
Jun: 68.6 mm (2.7 in)
The wettest day on record for each calendar month at West Yellowstone. The most was 68.6 mm (2.7 in) on 17 June 1925.
Record daily precipitation for each month at West Yellowstone
Month
Record daily precipitation (mm)
Date
Jan
42.7 mm (1.7 in)
31 January 1932
Feb
41.9 mm (1.6 in)
9 February 1937
Mar
27.7 mm (1.1 in)
28 March 1982
Apr
35.1 mm (1.4 in)
6 April 1926
May
37.3 mm (1.5 in)
10 May 1945
Jun
68.6 mm (2.7 in)
17 June 1925
Jul
35.6 mm (1.4 in)
20 July 1924
Aug
58.9 mm (2.3 in)
21 August 1986
Sep
35.8 mm (1.4 in)
30 September 1983
Oct
42.7 mm (1.7 in)
15 October 1938
Nov
37.8 mm (1.5 in)
23 November 1988
Dec
39.6 mm (1.6 in)
3 December 1941
Period of Record Coverage
1924 to 1996
Complete yearUnder 90 percent of days
73 years of record at West Yellowstone, 1924 to 1996. 13 years have data for under 90 percent of days and are left out of rankings: 1925, 1927, 1930, 1931, 1937, 1947, 1948, 1979 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 53 complete years at West Yellowstone, 1924 to 1990. Blue stripes are years cooler than the station's own mean of 1.6 C (34.9 F); red stripes are warmer. The coolest year was 1929, at -0.5 C (31.0 F), and the warmest was 1934, at 4.0 C (39.1 F). The strongest colour marks a difference of 2.4 C (4.3 F).
Annual mean temperature at West Yellowstone as warming stripes, 1924 to 1990
Year
Annual mean temperature
Difference from the station mean
1924
-0.1 C
-1.76 C
1926
2.3 C
+0.68 C
1929
-0.5 C
-2.15 C
1932
0.3 C
-1.35 C
1933
1.8 C
+0.17 C
1934
4.0 C
+2.33 C
1935
1.8 C
+0.13 C
1936
2.0 C
+0.39 C
1937
1.4 C
-0.24 C
1938
1.9 C
+0.24 C
1939
2.6 C
+1.02 C
1940
2.7 C
+1.11 C
1941
2.5 C
+0.86 C
1942
1.3 C
-0.28 C
1943
1.4 C
-0.18 C
1944
1.0 C
-0.65 C
1945
1.4 C
-0.26 C
1946
1.9 C
+0.24 C
1949
1.5 C
-0.16 C
1950
1.5 C
-0.09 C
1951
0.5 C
-1.08 C
1952
1.5 C
-0.15 C
1953
2.5 C
+0.91 C
1954
2.2 C
+0.54 C
1955
0.6 C
-1.07 C
1956
1.6 C
0.00 C
1957
1.7 C
+0.03 C
1958
2.7 C
+1.11 C
1959
1.5 C
-0.16 C
1960
1.5 C
-0.10 C
1961
1.6 C
0.00 C
1962
1.9 C
+0.24 C
1963
2.3 C
+0.64 C
1964
0.7 C
-0.93 C
1965
1.2 C
-0.42 C
1966
1.9 C
+0.24 C
1967
1.7 C
+0.10 C
1968
1.5 C
-0.15 C
1969
2.0 C
+0.41 C
1970
1.4 C
-0.19 C
1971
1.1 C
-0.49 C
1972
1.4 C
-0.21 C
1973
1.6 C
-0.06 C
1975
0.7 C
-0.89 C
1977
2.0 C
+0.38 C
1981
2.8 C
+1.15 C
1982
0.5 C
-1.16 C
1983
1.8 C
+0.14 C
1984
0.6 C
-1.01 C
1987
2.4 C
+0.81 C
1988
2.5 C
+0.84 C
1989
1.9 C
+0.26 C
1990
2.0 C
+0.36 C
The fitted trend in annual mean temperature here over 1924 to 1990 is 0.04 C (-0.09 to 0.16) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.1 F (-0.2 to 0.3) per decade. The slope is a straight line fitted to 53 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at West Yellowstone
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.04 C (-0.09 to 0.16) per decade
0.1 F (-0.2 to 0.3) per decade
1924 to 1990
53
Not clearly different from zero
Mean daily maximum
-0.3 C (-0.4 to -0.1) per decade
-0.5 F (-0.8 to -0.2) per decade
1924 to 1990
53
Fall
Mean daily minimum
0.4 C (0.2 to 0.5) per decade
0.6 F (0.4 to 0.9) per decade
1924 to 1990
53
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
1924 to 1996
Yearly extremes at West Yellowstone: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
36.1 C (97.0 F)
1936
32.2 C (90.0 F)
73
Coldest night (TNn)
-54.4 C (-65.9 F)
1933
-40.6 C (-41.1 F)
73
Wettest day (Rx1day)
68.6 mm (2.7 in)
1925
27.2 mm (1.1 in)
73
Wettest five days (Rx5day)
100.1 mm (3.9 in)
1943
49.1 mm (1.9 in)
73
Longest dry spell (CDD)
51 days
1978
22 days
73
Hottest day (TXx)
The hottest day of the year at West Yellowstone, 1924 to 1996. The record is 36.1 C (97.0 F) in 1936, marked on the chart; the median year is 32.2 C (90.0 F).
Hottest day (TXx) at West Yellowstone by year
Year
Hottest day (TXx)
1924
32.2 C (90.0 F)
1925
32.8 C (91.0 F)
1926
31.7 C (89.1 F)
1927
33.3 C (91.9 F)
1928
33.3 C (91.9 F)
1929
34.4 C (93.9 F)
1930
32.8 C (91.0 F)
1931
35.0 C (95.0 F)
1932
31.7 C (89.1 F)
1933
35.6 C (96.1 F)
1934
34.4 C (93.9 F)
1935
35.6 C (96.1 F)
1936
36.1 C (97.0 F)
1937
32.8 C (91.0 F)
1938
30.0 C (86.0 F)
1939
35.0 C (95.0 F)
1940
35.6 C (96.1 F)
1941
32.2 C (90.0 F)
1942
33.9 C (93.0 F)
1943
32.8 C (91.0 F)
1944
31.1 C (88.0 F)
1945
32.8 C (91.0 F)
1946
33.3 C (91.9 F)
1947
31.7 C (89.1 F)
1948
31.1 C (88.0 F)
1949
31.7 C (89.1 F)
1950
32.8 C (91.0 F)
1951
31.7 C (89.1 F)
1952
30.6 C (87.1 F)
1953
32.8 C (91.0 F)
1954
33.3 C (91.9 F)
1955
33.9 C (93.0 F)
1956
32.2 C (90.0 F)
1957
31.7 C (89.1 F)
1958
32.2 C (90.0 F)
1959
33.9 C (93.0 F)
1960
35.0 C (95.0 F)
1961
35.6 C (96.1 F)
1962
30.0 C (86.0 F)
1963
33.3 C (91.9 F)
1964
32.2 C (90.0 F)
1965
31.7 C (89.1 F)
1966
33.3 C (91.9 F)
1967
31.7 C (89.1 F)
1968
31.7 C (89.1 F)
1969
33.9 C (93.0 F)
1970
32.8 C (91.0 F)
1971
32.2 C (90.0 F)
1972
31.7 C (89.1 F)
1973
32.2 C (90.0 F)
1974
33.3 C (91.9 F)
1975
31.1 C (88.0 F)
1976
31.7 C (89.1 F)
1977
30.6 C (87.1 F)
1978
30.6 C (87.1 F)
1979
32.2 C (90.0 F)
1980
31.1 C (88.0 F)
1981
32.8 C (91.0 F)
1982
31.7 C (89.1 F)
1983
33.3 C (91.9 F)
1984
31.1 C (88.0 F)
1985
31.7 C (89.1 F)
1986
30.6 C (87.1 F)
1987
28.9 C (84.0 F)
1988
32.8 C (91.0 F)
1989
32.8 C (91.0 F)
1990
32.2 C (90.0 F)
1991
31.1 C (88.0 F)
1992
32.2 C (90.0 F)
1993
28.9 C (84.0 F)
1994
33.9 C (93.0 F)
1995
30.6 C (87.1 F)
1996
8.9 C (48.0 F)
Coldest night (TNn)
The coldest night of the year at West Yellowstone, 1924 to 1996. The record is -54.4 C (-65.9 F) in 1933, marked on the chart; the median year is -40.6 C (-41.1 F).
Coldest night (TNn) at West Yellowstone by year
Year
Coldest night (TNn)
1924
-50.6 C (-59.1 F)
1925
-30.0 C (-22.0 F)
1926
-45.0 C (-49.0 F)
1927
-43.9 C (-47.0 F)
1928
-38.3 C (-36.9 F)
1929
-45.6 C (-50.1 F)
1930
-49.4 C (-56.9 F)
1931
-37.8 C (-36.0 F)
1932
-42.8 C (-45.0 F)
1933
-54.4 C (-65.9 F)
1934
-31.1 C (-24.0 F)
1935
-43.3 C (-45.9 F)
1936
-44.4 C (-47.9 F)
1937
-48.9 C (-56.0 F)
1938
-37.8 C (-36.0 F)
1939
-36.7 C (-34.1 F)
1940
-41.1 C (-42.0 F)
1941
-35.6 C (-32.1 F)
1942
-44.4 C (-47.9 F)
1943
-50.0 C (-58.0 F)
1944
-36.1 C (-33.0 F)
1945
-38.9 C (-38.0 F)
1946
-37.8 C (-36.0 F)
1947
-38.9 C (-38.0 F)
1948
-44.4 C (-47.9 F)
1949
-41.1 C (-42.0 F)
1950
-40.6 C (-41.1 F)
1951
-48.3 C (-54.9 F)
1952
-37.8 C (-36.0 F)
1953
-37.2 C (-35.0 F)
1954
-37.8 C (-36.0 F)
1955
-41.7 C (-43.1 F)
1956
-46.7 C (-52.1 F)
1957
-47.8 C (-54.0 F)
1958
-33.3 C (-27.9 F)
1959
-42.2 C (-44.0 F)
1960
-41.1 C (-42.0 F)
1961
-41.7 C (-43.1 F)
1962
-48.3 C (-54.9 F)
1963
-51.1 C (-60.0 F)
1964
-46.7 C (-52.1 F)
1965
-38.3 C (-36.9 F)
1966
-37.2 C (-35.0 F)
1967
-37.2 C (-35.0 F)
1968
-37.8 C (-36.0 F)
1969
-30.6 C (-23.1 F)
1970
-40.6 C (-41.1 F)
1971
-40.0 C (-40.0 F)
1972
-44.4 C (-47.9 F)
1973
-38.9 C (-38.0 F)
1974
-38.3 C (-36.9 F)
1975
-36.1 C (-33.0 F)
1976
-37.2 C (-35.0 F)
1977
-37.2 C (-35.0 F)
1978
-45.6 C (-50.1 F)
1979
-42.8 C (-45.0 F)
1980
-43.3 C (-45.9 F)
1981
-42.2 C (-44.0 F)
1982
-45.0 C (-49.0 F)
1983
-44.4 C (-47.9 F)
1984
-41.7 C (-43.1 F)
1985
-42.8 C (-45.0 F)
1986
-35.0 C (-31.0 F)
1987
-37.2 C (-35.0 F)
1988
-37.2 C (-35.0 F)
1989
-37.8 C (-36.0 F)
1990
-43.3 C (-45.9 F)
1991
-34.4 C (-29.9 F)
1992
-37.8 C (-36.0 F)
1993
-35.6 C (-32.1 F)
1994
-32.8 C (-27.0 F)
1995
-38.9 C (-38.0 F)
1996
-47.2 C (-53.0 F)
Wettest day (Rx1day)
The wettest day of the year at West Yellowstone, 1924 to 1996. The record is 68.6 mm (2.7 in) in 1925, marked on the chart; the median year is 27.2 mm (1.1 in).
Wettest day (Rx1day) at West Yellowstone by year
Year
Wettest day (Rx1day)
1924
35.6 mm (1.4 in)
1925
68.6 mm (2.7 in)
1926
35.1 mm (1.4 in)
1927
31.0 mm (1.2 in)
1928
22.4 mm (0.9 in)
1929
23.9 mm (0.9 in)
1930
21.3 mm (0.8 in)
1931
20.3 mm (0.8 in)
1932
42.7 mm (1.7 in)
1933
17.8 mm (0.7 in)
1934
25.9 mm (1.0 in)
1935
20.3 mm (0.8 in)
1936
32.0 mm (1.3 in)
1937
41.9 mm (1.6 in)
1938
42.7 mm (1.7 in)
1939
12.2 mm (0.5 in)
1940
30.0 mm (1.2 in)
1941
39.6 mm (1.6 in)
1942
23.6 mm (0.9 in)
1943
42.2 mm (1.7 in)
1944
24.9 mm (1.0 in)
1945
37.3 mm (1.5 in)
1946
23.4 mm (0.9 in)
1947
22.1 mm (0.9 in)
1948
16.3 mm (0.6 in)
1949
13.7 mm (0.5 in)
1950
25.1 mm (1.0 in)
1951
34.8 mm (1.4 in)
1952
33.8 mm (1.3 in)
1953
27.4 mm (1.1 in)
1954
31.8 mm (1.3 in)
1955
32.8 mm (1.3 in)
1956
15.2 mm (0.6 in)
1957
31.8 mm (1.3 in)
1958
22.1 mm (0.9 in)
1959
20.8 mm (0.8 in)
1960
18.5 mm (0.7 in)
1961
37.1 mm (1.5 in)
1962
26.7 mm (1.1 in)
1963
22.4 mm (0.9 in)
1964
26.7 mm (1.1 in)
1965
33.0 mm (1.3 in)
1966
23.1 mm (0.9 in)
1967
32.3 mm (1.3 in)
1968
26.2 mm (1.0 in)
1969
22.1 mm (0.9 in)
1970
27.9 mm (1.1 in)
1971
31.5 mm (1.2 in)
1972
24.4 mm (1.0 in)
1973
24.1 mm (0.9 in)
1974
14.7 mm (0.6 in)
1975
32.3 mm (1.3 in)
1976
28.7 mm (1.1 in)
1977
20.8 mm (0.8 in)
1978
21.3 mm (0.8 in)
1979
24.4 mm (1.0 in)
1980
27.2 mm (1.1 in)
1981
18.5 mm (0.7 in)
1982
27.7 mm (1.1 in)
1983
35.8 mm (1.4 in)
1984
18.8 mm (0.7 in)
1985
37.1 mm (1.5 in)
1986
58.9 mm (2.3 in)
1987
30.0 mm (1.2 in)
1988
37.8 mm (1.5 in)
1989
29.5 mm (1.2 in)
1990
22.4 mm (0.9 in)
1991
24.4 mm (1.0 in)
1992
31.0 mm (1.2 in)
1993
27.7 mm (1.1 in)
1994
36.6 mm (1.4 in)
1995
27.7 mm (1.1 in)
1996
19.6 mm (0.8 in)
Wettest five days (Rx5day)
The wettest five days of the year at West Yellowstone, 1924 to 1996. The record is 100.1 mm (3.9 in) in 1943, marked on the chart; the median year is 49.1 mm (1.9 in).
Wettest five days (Rx5day) at West Yellowstone by year
Year
Wettest five days (Rx5day)
1924
35.6 mm (1.4 in)
1925
71.9 mm (2.8 in)
1926
60.8 mm (2.4 in)
1927
60.5 mm (2.4 in)
1928
33.6 mm (1.3 in)
1929
43.5 mm (1.7 in)
1930
49.1 mm (1.9 in)
1931
47.5 mm (1.9 in)
1932
55.7 mm (2.2 in)
1933
30.9 mm (1.2 in)
1934
43.8 mm (1.7 in)
1935
36.3 mm (1.4 in)
1936
51.3 mm (2.0 in)
1937
47.0 mm (1.9 in)
1938
80.0 mm (3.1 in)
1939
37.0 mm (1.5 in)
1940
43.6 mm (1.7 in)
1941
54.8 mm (2.2 in)
1942
47.2 mm (1.9 in)
1943
100.1 mm (3.9 in)
1944
52.7 mm (2.1 in)
1945
73.3 mm (2.9 in)
1946
50.6 mm (2.0 in)
1947
40.5 mm (1.6 in)
1948
33.3 mm (1.3 in)
1949
28.0 mm (1.1 in)
1950
34.6 mm (1.4 in)
1951
55.1 mm (2.2 in)
1952
62.2 mm (2.4 in)
1953
52.8 mm (2.1 in)
1954
58.5 mm (2.3 in)
1955
67.0 mm (2.6 in)
1956
38.1 mm (1.5 in)
1957
36.9 mm (1.5 in)
1958
46.2 mm (1.8 in)
1959
48.7 mm (1.9 in)
1960
50.8 mm (2.0 in)
1961
50.0 mm (2.0 in)
1962
65.8 mm (2.6 in)
1963
49.0 mm (1.9 in)
1964
59.5 mm (2.3 in)
1965
57.7 mm (2.3 in)
1966
45.0 mm (1.8 in)
1967
60.7 mm (2.4 in)
1968
69.4 mm (2.7 in)
1969
55.4 mm (2.2 in)
1970
50.6 mm (2.0 in)
1971
46.7 mm (1.8 in)
1972
35.0 mm (1.4 in)
1973
43.2 mm (1.7 in)
1974
28.7 mm (1.1 in)
1975
62.3 mm (2.5 in)
1976
57.2 mm (2.3 in)
1977
39.6 mm (1.6 in)
1978
25.4 mm (1.0 in)
1979
29.0 mm (1.1 in)
1980
44.0 mm (1.7 in)
1981
34.0 mm (1.3 in)
1982
48.7 mm (1.9 in)
1983
71.6 mm (2.8 in)
1984
37.1 mm (1.5 in)
1985
51.5 mm (2.0 in)
1986
70.6 mm (2.8 in)
1987
40.9 mm (1.6 in)
1988
63.7 mm (2.5 in)
1989
42.2 mm (1.7 in)
1990
48.0 mm (1.9 in)
1991
63.7 mm (2.5 in)
1992
49.8 mm (2.0 in)
1993
63.4 mm (2.5 in)
1994
95.2 mm (3.7 in)
1995
58.7 mm (2.3 in)
1996
26.2 mm (1.0 in)
Longest dry spell (CDD)
The longest dry spell of the year at West Yellowstone, 1924 to 1996. The record is 51 days in 1978, marked on the chart; the median year is 22 days.
Longest dry spell (CDD) at West Yellowstone by year
Year
Longest dry spell (CDD)
1924
17 days
1925
9 days
1926
25 days
1927
25 days
1928
18 days
1929
27 days
1930
31 days
1931
20 days
1932
22 days
1933
29 days
1934
34 days
1935
25 days
1936
21 days
1937
21 days
1938
15 days
1939
41 days
1940
21 days
1941
20 days
1942
39 days
1943
20 days
1944
18 days
1945
19 days
1946
16 days
1947
26 days
1948
25 days
1949
48 days
1950
27 days
1951
46 days
1952
38 days
1953
21 days
1954
23 days
1955
21 days
1956
14 days
1957
17 days
1958
14 days
1959
24 days
1960
22 days
1961
20 days
1962
20 days
1963
20 days
1964
24 days
1965
22 days
1966
19 days
1967
26 days
1968
21 days
1969
37 days
1970
14 days
1971
30 days
1972
15 days
1973
17 days
1974
26 days
1975
36 days
1976
30 days
1977
36 days
1978
51 days
1979
32 days
1980
23 days
1981
32 days
1982
20 days
1983
15 days
1984
16 days
1985
20 days
1986
25 days
1987
35 days
1988
33 days
1989
20 days
1990
17 days
1991
17 days
1992
23 days
1993
19 days
1994
33 days
1995
16 days
1996
10 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
53 years with a frost
Across 53 years with a frost, the median last spring frost at West Yellowstone falls on 29 June and the median first autumn frost on 4 July, which leaves a median of 8 days between them.
Fitted over all years, the growing season changes by +2.5 days per decade at this station.
Frost dates and growing season at West Yellowstone
Measure
Median, all years
Earliest period
Recent period (1954 to 1990)
Recent against earliest
Fitted trend
Last spring frost
29 June
n/a
28 June
n/a
-0.6 days per decade
First autumn frost
4 July
n/a
4 July
n/a
+1.9 days per decade
Growing days
8 days
n/a
10 days
n/a
+2.5 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
62 years, 1924 to 1995
A day with at least 27.6 mm (1.1 in) of rain is expected about once in 2 years. A day with at least 50.0 mm (2.0 in) of rain is expected about once in 100 years.
Rainfall return levels at West Yellowstone: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
27.6 mm (1.1 in)
5 years
35.0 mm (1.4 in)
10 years
39.3 mm (1.5 in)
25 years
44.1 mm (1.7 in)
50 years
47.2 mm (1.9 in)
100 years
50.0 mm (2.0 in)
Longer than the 62 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, 62 years of values from 1924 to 1995.
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: 58.9 mm (2.3 in) in 1986; 42.7 mm (1.7 in) in 1932; 42.7 mm (1.7 in) in 1938.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Download the Data
Data for West Yellowstone standing records by year: CSV or JSON. Field meanings are on the data page.
Data for West Yellowstone 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 2026-10-16 (16 October 2026). Records are computed by this site and are not official.