Record envelope, standing records and threshold days for Cascade 20 SSE (USC00241557), Montana, United States, with 138 years of record.
Key Facts for Cascade 20 SSE
Cascade 20 SSE (USC00241557) is a weather station in Montana, United States at 47.00 latitude and -111.58 longitude, 1,402 m (4,600 ft) above sea level.
The station reports from 1876 to 2013, 138 years of record.
1,464 records set at Cascade 20 SSE still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Cascade 20 SSE set a daily record snowfall of 10.2 cm (4.0 in) on 18 February 2013.
About the Station
Location: Montana, United States, 47.00 latitude, -111.58 longitude.
Elevation: 1,402 m (4,600 ft).
Period of record: 1876 to 2013, 138 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 Cascade 20 SSE. 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 Cascade 20 SSE, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
17.8 C (64.0 F)
-41.7 C (-43.1 F)
n/a
n/a
Feb
18.3 C (64.9 F)
-42.2 C (-44.0 F)
n/a
n/a
Mar
23.3 C (73.9 F)
-34.4 C (-29.9 F)
n/a
n/a
Apr
27.8 C (82.0 F)
-23.3 C (-9.9 F)
n/a
n/a
May
32.8 C (91.0 F)
-11.7 C (10.9 F)
n/a
n/a
Jun
35.0 C (95.0 F)
-6.7 C (19.9 F)
n/a
n/a
Jul
37.2 C (99.0 F)
-3.9 C (25.0 F)
n/a
n/a
Aug
37.8 C (100.0 F)
-6.1 C (21.0 F)
n/a
n/a
Sep
35.6 C (96.1 F)
-14.4 C (6.1 F)
n/a
n/a
Oct
31.1 C (88.0 F)
-26.7 C (-16.1 F)
n/a
n/a
Nov
23.3 C (73.9 F)
-37.8 C (-36.0 F)
n/a
n/a
Dec
17.2 C (63.0 F)
-43.9 C (-47.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Cascade 20 SSE still stand. 1996 holds the most, with 48.
Standing records at Cascade 20 SSE by the year they were set
Year set
Standing records
1956
17
1957
26
1958
26
1959
25
1960
30
1961
33
1962
31
1963
30
1964
22
1965
27
1966
21
1967
30
1968
30
1969
33
1970
22
1971
23
1972
37
1973
24
1974
23
1975
26
1976
22
1977
21
1978
22
1979
13
1980
27
1981
18
1982
20
1983
26
1984
28
1985
43
1986
30
1987
38
1988
21
1989
24
1990
24
1991
24
1992
31
1993
19
1994
20
1995
33
1996
48
1997
36
1998
17
1999
25
2000
22
2001
17
2002
37
2003
31
2004
16
2005
30
2006
17
2007
27
2008
16
2009
26
2010
18
2011
16
2012
25
All-Time Record Progression
3 new records
3 all-time records were set at Cascade 20 SSE between 2 February 1989 and 19 July 2007. Each dot is a new record.
When Cascade 20 SSE set new all-time records
Date
Kind
Detail
1989-02-02
Record low maximum temperature
Record low maximum temperature -34.4 C (-29.9 F)
2005-11-27
Record daily snowfall
Record daily snowfall 50.8 cm (20.0 in)
2007-07-19
Record high minimum temperature
Record high minimum temperature 21.1 C (70.0 F)
Wettest Day of Each Month
May: 65.0 mm (2.6 in)
The wettest day on record for each calendar month at Cascade 20 SSE. The most was 65.0 mm (2.6 in) on 25 May 1980.
Record daily precipitation for each month at Cascade 20 SSE
Month
Record daily precipitation (mm)
Date
Jan
27.9 mm (1.1 in)
20 January 1969
Feb
30.5 mm (1.2 in)
16 February 1959
Mar
33.0 mm (1.3 in)
16 March 1958
Apr
57.2 mm (2.3 in)
26 April 1975
May
65.0 mm (2.6 in)
25 May 1980
Jun
63.0 mm (2.5 in)
10 June 2006
Jul
51.1 mm (2.0 in)
10 July 1983
Aug
35.8 mm (1.4 in)
7 August 2009
Sep
41.1 mm (1.6 in)
18 September 1988
Oct
34.3 mm (1.4 in)
13 October 1975
Nov
30.5 mm (1.2 in)
27 November 2005
Dec
15.2 mm (0.6 in)
20 December 1964
Period of Record Coverage
1876 to 2013
Complete yearUnder 90 percent of days
59 years of record at Cascade 20 SSE, 1876 to 2013. 3 years have data for under 90 percent of days and are left out of rankings: 1876, 1956, 2013.
Cooler than the station meanWarmer than the station mean
One stripe for each of 54 complete years at Cascade 20 SSE, 1958 to 2012. Blue stripes are years cooler than the station's own mean of 5.8 C (42.4 F); red stripes are warmer. The coolest year was 1996, at 4.3 C (39.7 F), and the warmest was 1987, at 7.2 C (45.0 F). The strongest colour marks a difference of 1.6 C (2.9 F).
Annual mean temperature at Cascade 20 SSE as warming stripes, 1958 to 2012
Year
Annual mean temperature
Difference from the station mean
1958
6.6 C
+0.80 C
1959
5.6 C
-0.23 C
1960
5.9 C
+0.06 C
1961
6.5 C
+0.74 C
1962
5.4 C
-0.40 C
1963
6.0 C
+0.24 C
1964
5.0 C
-0.85 C
1965
5.0 C
-0.79 C
1966
5.7 C
-0.06 C
1967
5.3 C
-0.46 C
1968
5.2 C
-0.56 C
1969
4.9 C
-0.94 C
1970
5.4 C
-0.39 C
1971
5.4 C
-0.40 C
1972
5.4 C
-0.43 C
1973
6.1 C
+0.31 C
1974
6.4 C
+0.58 C
1975
4.4 C
-1.43 C
1976
6.6 C
+0.76 C
1977
5.6 C
-0.24 C
1978
4.4 C
-1.37 C
1979
5.4 C
-0.37 C
1980
5.8 C
-0.04 C
1981
6.8 C
+1.02 C
1982
4.6 C
-1.25 C
1983
5.7 C
-0.07 C
1984
5.6 C
-0.20 C
1985
4.7 C
-1.12 C
1986
6.7 C
+0.92 C
1987
7.2 C
+1.41 C
1988
6.8 C
+0.95 C
1989
5.2 C
-0.65 C
1990
6.2 C
+0.43 C
1991
6.3 C
+0.51 C
1992
6.8 C
+0.95 C
1993
4.8 C
-0.99 C
1994
6.6 C
+0.84 C
1995
5.9 C
+0.09 C
1996
4.3 C
-1.51 C
1997
6.2 C
+0.35 C
1998
6.8 C
+1.03 C
1999
7.0 C
+1.19 C
2000
5.9 C
+0.06 C
2001
6.5 C
+0.67 C
2002
5.1 C
-0.70 C
2003
6.4 C
+0.56 C
2004
6.1 C
+0.32 C
2006
7.0 C
+1.15 C
2007
6.8 C
+0.95 C
2008
5.5 C
-0.27 C
2009
5.2 C
-0.56 C
2010
5.3 C
-0.52 C
2011
5.1 C
-0.75 C
2012
6.7 C
+0.90 C
The fitted trend in annual mean temperature here over 1958 to 2012 is 0.10 C (-0.03 to 0.23) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.2 F (-0.1 to 0.4) per decade. The slope is a straight line fitted to 54 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Cascade 20 SSE
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.10 C (-0.03 to 0.23) per decade
0.2 F (-0.1 to 0.4) per decade
1958 to 2012
54
Not clearly different from zero
Mean daily maximum
0.1 C (-0.1 to 0.2) per decade
0.1 F (-0.2 to 0.4) per decade
1958 to 2012
54
Not clearly different from zero
Mean daily minimum
0.12 C (0.00 to 0.24) per decade
0.21 F (-0.01 to 0.44) per decade
1958 to 2012
54
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
1876 to 2013
Yearly extremes at Cascade 20 SSE: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
37.8 C (100.0 F)
1961
34.4 C (93.9 F)
59
Coldest night (TNn)
-43.9 C (-47.0 F)
1968
-33.9 C (-29.0 F)
59
Wettest day (Rx1day)
65.0 mm (2.6 in)
1980
32.3 mm (1.3 in)
59
Wettest five days (Rx5day)
97.9 mm (3.9 in)
1969
51.7 mm (2.0 in)
58
Longest dry spell (CDD)
61 days
1992
29 days
59
Hottest day (TXx)
The hottest day of the year at Cascade 20 SSE, 1876 to 2013. The record is 37.8 C (100.0 F) in 1961, marked on the chart; the median year is 34.4 C (93.9 F).
Hottest day (TXx) at Cascade 20 SSE by year
Year
Hottest day (TXx)
1876
10.0 C (50.0 F)
1956
37.2 C (99.0 F)
1957
32.2 C (90.0 F)
1958
33.3 C (91.9 F)
1959
33.9 C (93.0 F)
1960
35.6 C (96.1 F)
1961
37.8 C (100.0 F)
1962
32.8 C (91.0 F)
1963
34.4 C (93.9 F)
1964
32.8 C (91.0 F)
1965
33.9 C (93.0 F)
1966
34.4 C (93.9 F)
1967
35.0 C (95.0 F)
1968
32.8 C (91.0 F)
1969
37.2 C (99.0 F)
1970
35.0 C (95.0 F)
1971
35.0 C (95.0 F)
1972
33.3 C (91.9 F)
1973
35.0 C (95.0 F)
1974
33.3 C (91.9 F)
1975
33.9 C (93.0 F)
1976
35.0 C (95.0 F)
1977
31.7 C (89.1 F)
1978
32.8 C (91.0 F)
1979
33.3 C (91.9 F)
1980
33.9 C (93.0 F)
1981
35.6 C (96.1 F)
1982
32.8 C (91.0 F)
1983
37.2 C (99.0 F)
1984
36.7 C (98.1 F)
1985
35.0 C (95.0 F)
1986
33.9 C (93.0 F)
1987
33.9 C (93.0 F)
1988
35.0 C (95.0 F)
1989
33.9 C (93.0 F)
1990
36.1 C (97.0 F)
1991
35.6 C (96.1 F)
1992
35.0 C (95.0 F)
1993
31.7 C (89.1 F)
1994
34.4 C (93.9 F)
1995
34.4 C (93.9 F)
1996
35.6 C (96.1 F)
1997
32.8 C (91.0 F)
1998
34.4 C (93.9 F)
1999
35.0 C (95.0 F)
2000
36.1 C (97.0 F)
2001
35.6 C (96.1 F)
2002
37.2 C (99.0 F)
2003
36.7 C (98.1 F)
2004
33.9 C (93.0 F)
2005
35.0 C (95.0 F)
2006
36.1 C (97.0 F)
2007
37.2 C (99.0 F)
2008
33.3 C (91.9 F)
2009
32.8 C (91.0 F)
2010
32.8 C (91.0 F)
2011
32.8 C (91.0 F)
2012
34.4 C (93.9 F)
2013
10.0 C (50.0 F)
Coldest night (TNn)
The coldest night of the year at Cascade 20 SSE, 1876 to 2013. The record is -43.9 C (-47.0 F) in 1968, marked on the chart; the median year is -33.9 C (-29.0 F).
Coldest night (TNn) at Cascade 20 SSE by year
Year
Coldest night (TNn)
1876
-5.6 C (21.9 F)
1956
-32.2 C (-26.0 F)
1957
-41.7 C (-43.1 F)
1958
-26.7 C (-16.1 F)
1959
-38.9 C (-38.0 F)
1960
-34.4 C (-29.9 F)
1961
-33.3 C (-27.9 F)
1962
-36.1 C (-33.0 F)
1963
-37.2 C (-35.0 F)
1964
-38.3 C (-36.9 F)
1965
-33.9 C (-29.0 F)
1966
-32.2 C (-26.0 F)
1967
-32.8 C (-27.0 F)
1968
-43.9 C (-47.0 F)
1969
-37.2 C (-35.0 F)
1970
-27.8 C (-18.0 F)
1971
-33.9 C (-29.0 F)
1972
-38.9 C (-38.0 F)
1973
-35.0 C (-31.0 F)
1974
-37.2 C (-35.0 F)
1975
-32.2 C (-26.0 F)
1976
-33.3 C (-27.9 F)
1977
-32.2 C (-26.0 F)
1978
-36.7 C (-34.1 F)
1979
-30.0 C (-22.0 F)
1980
-36.1 C (-33.0 F)
1981
-40.0 C (-40.0 F)
1982
-35.0 C (-31.0 F)
1983
-42.8 C (-45.0 F)
1984
-31.7 C (-25.1 F)
1985
-37.2 C (-35.0 F)
1986
-30.6 C (-23.1 F)
1987
-30.0 C (-22.0 F)
1988
-30.0 C (-22.0 F)
1989
-42.2 C (-44.0 F)
1990
-37.2 C (-35.0 F)
1991
-32.8 C (-27.0 F)
1992
-31.7 C (-25.1 F)
1993
-31.7 C (-25.1 F)
1994
-35.0 C (-31.0 F)
1995
-32.2 C (-26.0 F)
1996
-39.4 C (-38.9 F)
1997
-38.3 C (-36.9 F)
1998
-36.7 C (-34.1 F)
1999
-28.3 C (-18.9 F)
2000
-31.1 C (-24.0 F)
2001
-28.9 C (-20.0 F)
2002
-32.2 C (-26.0 F)
2003
-29.4 C (-20.9 F)
2004
-38.3 C (-36.9 F)
2005
-37.2 C (-35.0 F)
2006
-39.4 C (-38.9 F)
2007
-29.4 C (-20.9 F)
2008
-34.4 C (-29.9 F)
2009
-38.3 C (-36.9 F)
2010
-28.9 C (-20.0 F)
2011
-33.9 C (-29.0 F)
2012
-28.3 C (-18.9 F)
2013
-21.7 C (-7.1 F)
Wettest day (Rx1day)
The wettest day of the year at Cascade 20 SSE, 1876 to 2013. The record is 65.0 mm (2.6 in) in 1980, marked on the chart; the median year is 32.3 mm (1.3 in).
Wettest day (Rx1day) at Cascade 20 SSE by year
Year
Wettest day (Rx1day)
1876
0.0 mm (0.00 in)
1956
29.2 mm (1.1 in)
1957
51.6 mm (2.0 in)
1958
35.8 mm (1.4 in)
1959
30.5 mm (1.2 in)
1960
16.3 mm (0.6 in)
1961
21.6 mm (0.9 in)
1962
32.3 mm (1.3 in)
1963
33.3 mm (1.3 in)
1964
30.7 mm (1.2 in)
1965
26.9 mm (1.1 in)
1966
17.8 mm (0.7 in)
1967
31.2 mm (1.2 in)
1968
42.7 mm (1.7 in)
1969
35.1 mm (1.4 in)
1970
39.4 mm (1.6 in)
1971
19.8 mm (0.8 in)
1972
18.3 mm (0.7 in)
1973
36.1 mm (1.4 in)
1974
34.8 mm (1.4 in)
1975
57.2 mm (2.3 in)
1976
20.3 mm (0.8 in)
1977
32.5 mm (1.3 in)
1978
35.1 mm (1.4 in)
1979
28.4 mm (1.1 in)
1980
65.0 mm (2.6 in)
1981
33.0 mm (1.3 in)
1982
24.1 mm (0.9 in)
1983
51.1 mm (2.0 in)
1984
30.5 mm (1.2 in)
1985
34.5 mm (1.4 in)
1986
25.9 mm (1.0 in)
1987
33.0 mm (1.3 in)
1988
41.9 mm (1.6 in)
1989
20.3 mm (0.8 in)
1990
24.4 mm (1.0 in)
1991
40.4 mm (1.6 in)
1992
27.7 mm (1.1 in)
1993
33.0 mm (1.3 in)
1994
23.6 mm (0.9 in)
1995
37.6 mm (1.5 in)
1996
19.6 mm (0.8 in)
1997
33.8 mm (1.3 in)
1998
35.3 mm (1.4 in)
1999
35.1 mm (1.4 in)
2000
38.1 mm (1.5 in)
2001
24.6 mm (1.0 in)
2002
31.0 mm (1.2 in)
2003
19.1 mm (0.8 in)
2004
35.1 mm (1.4 in)
2005
30.5 mm (1.2 in)
2006
63.0 mm (2.5 in)
2007
30.5 mm (1.2 in)
2008
26.4 mm (1.0 in)
2009
35.8 mm (1.4 in)
2010
34.5 mm (1.4 in)
2011
35.8 mm (1.4 in)
2012
18.3 mm (0.7 in)
2013
3.8 mm (0.15 in)
Wettest five days (Rx5day)
The wettest five days of the year at Cascade 20 SSE, 1876 to 2013. The record is 97.9 mm (3.9 in) in 1969, marked on the chart; the median year is 51.7 mm (2.0 in).
Wettest five days (Rx5day) at Cascade 20 SSE by year
Year
Wettest five days (Rx5day)
1876
n/a
1956
30.5 mm (1.2 in)
1957
87.2 mm (3.4 in)
1958
47.0 mm (1.9 in)
1959
31.8 mm (1.3 in)
1960
34.3 mm (1.4 in)
1961
39.1 mm (1.5 in)
1962
79.0 mm (3.1 in)
1963
58.0 mm (2.3 in)
1964
64.3 mm (2.5 in)
1965
52.4 mm (2.1 in)
1966
33.1 mm (1.3 in)
1967
62.3 mm (2.5 in)
1968
67.1 mm (2.6 in)
1969
97.9 mm (3.9 in)
1970
45.8 mm (1.8 in)
1971
44.9 mm (1.8 in)
1972
28.7 mm (1.1 in)
1973
41.7 mm (1.6 in)
1974
53.6 mm (2.1 in)
1975
90.9 mm (3.6 in)
1976
33.3 mm (1.3 in)
1977
56.1 mm (2.2 in)
1978
60.5 mm (2.4 in)
1979
53.0 mm (2.1 in)
1980
87.6 mm (3.4 in)
1981
77.7 mm (3.1 in)
1982
54.6 mm (2.1 in)
1983
65.9 mm (2.6 in)
1984
33.0 mm (1.3 in)
1985
51.3 mm (2.0 in)
1986
38.3 mm (1.5 in)
1987
41.9 mm (1.6 in)
1988
48.8 mm (1.9 in)
1989
37.3 mm (1.5 in)
1990
42.5 mm (1.7 in)
1991
61.3 mm (2.4 in)
1992
52.1 mm (2.1 in)
1993
50.8 mm (2.0 in)
1994
34.5 mm (1.4 in)
1995
55.9 mm (2.2 in)
1996
48.1 mm (1.9 in)
1997
45.4 mm (1.8 in)
1998
77.1 mm (3.0 in)
1999
61.3 mm (2.4 in)
2000
48.3 mm (1.9 in)
2001
38.3 mm (1.5 in)
2002
79.8 mm (3.1 in)
2003
37.7 mm (1.5 in)
2004
47.8 mm (1.9 in)
2005
63.9 mm (2.5 in)
2006
87.3 mm (3.4 in)
2007
70.4 mm (2.8 in)
2008
89.9 mm (3.5 in)
2009
39.4 mm (1.6 in)
2010
54.1 mm (2.1 in)
2011
55.2 mm (2.2 in)
2012
26.9 mm (1.1 in)
2013
8.4 mm (0.33 in)
Longest dry spell (CDD)
The longest dry spell of the year at Cascade 20 SSE, 1876 to 2013. The record is 61 days in 1992, marked on the chart; the median year is 29 days.
Longest dry spell (CDD) at Cascade 20 SSE by year
Year
Longest dry spell (CDD)
1876
1 day
1956
27 days
1957
33 days
1958
31 days
1959
52 days
1960
37 days
1961
45 days
1962
35 days
1963
31 days
1964
38 days
1965
26 days
1966
25 days
1967
31 days
1968
23 days
1969
38 days
1970
40 days
1971
22 days
1972
58 days
1973
29 days
1974
48 days
1975
31 days
1976
38 days
1977
38 days
1978
18 days
1979
27 days
1980
27 days
1981
27 days
1982
20 days
1983
32 days
1984
27 days
1985
30 days
1986
25 days
1987
52 days
1988
45 days
1989
17 days
1990
37 days
1991
25 days
1992
61 days
1993
21 days
1994
32 days
1995
19 days
1996
25 days
1997
27 days
1998
32 days
1999
25 days
2000
40 days
2001
27 days
2002
23 days
2003
27 days
2004
29 days
2005
29 days
2006
39 days
2007
33 days
2008
26 days
2009
33 days
2010
27 days
2011
19 days
2012
41 days
2013
17 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
54 years with a frost
Across 54 years with a frost, the median last spring frost at Cascade 20 SSE falls on 21 June and the median first autumn frost on 3 August, which leaves a median of 47 days between them.
Fitted over all years, the growing season changes by 0.0 days per decade at this station.
Frost dates and growing season at Cascade 20 SSE
Measure
Median, all years
Earliest period
Recent period (1982 to 2012)
Recent against earliest
Fitted trend
Last spring frost
21 June
n/a
22 June
n/a
+1.4 days per decade
First autumn frost
3 August
n/a
6 August
n/a
+1.4 days per decade
Growing days
47 days
n/a
48 days
n/a
0.0 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
55 years, 1957 to 2012
A day with at least 31.0 mm (1.2 in) of rain is expected about once in 2 years. A day with at least 63.2 mm (2.5 in) of rain is expected about once in 100 years.
Rainfall return levels at Cascade 20 SSE: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
31.0 mm (1.2 in)
5 years
40.2 mm (1.6 in)
10 years
46.0 mm (1.8 in)
25 years
53.2 mm (2.1 in)
50 years
58.3 mm (2.3 in)
100 years
63.2 mm (2.5 in)
Longer than the 55 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, 55 years of values from 1957 to 2012.
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: 65.0 mm (2.6 in) in 1980; 63.0 mm (2.5 in) in 2006; 57.2 mm (2.3 in) in 1975.
Station Changes
2 suspected
2 changes were suspected in the annual mean temperature of Cascade 20 SSE, at 1983 and 1999. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1983 ran 0.2 C (0.3 F) lower than in the years before (likely change).
Relative to 5 neighbouring stations, the station's annual mean temperature from 1999 ran 0.2 C (0.3 F) lower than in the years before (possible change).
Suspected changes in the annual mean temperature at Cascade 20 SSE, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1983
-0.2
-0.3
likely
5
1999
-0.2
-0.3
possible
5
Possible change at the station (a move, a new instrument or a new site); the record is kept as measured. A "likely" change has a larger test statistic than a "possible" one. Neither says why the station differs from its neighbours. How changes are found, and the largest ones.
Download the Data
Data for Cascade 20 SSE standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Cascade 20 SSE 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 2026-10-15 (15 October 2026). Records are computed by this site and are not official.