Record envelope, standing records and threshold days for Cottonwood 2 WSW (USC00102159), Idaho, United States, with 77 years of record.
Key Facts for Cottonwood 2 WSW
Cottonwood 2 WSW (USC00102159) is a weather station in Idaho, United States at 46.03 latitude and -116.39 longitude, 1,202 m (3,945 ft) above sea level.
The station reports from 1950 to 2026, 77 years of record.
1,464 records set at Cottonwood 2 WSW still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Cottonwood 2 WSW set a daily record high maximum temperature of 34.4 C (93.9 F) on 16 July 2026.
About the Station
Location: Idaho, United States, 46.03 latitude, -116.39 longitude.
Elevation: 1,202 m (3,945 ft).
Period of record: 1950 to 2026, 77 years.
Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
20 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 Cottonwood 2 WSW. The lines show the 2026 daily maximum and minimum. 20 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Cottonwood 2 WSW, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
15.6 C (60.1 F)
-27.2 C (-17.0 F)
12.8 C (55.0 F)
-11.1 C (12.0 F)
Feb
17.8 C (64.0 F)
-28.9 C (-20.0 F)
15.6 C (60.1 F)
-7.8 C (18.0 F)
Mar
24.4 C (75.9 F)
-15.6 C (3.9 F)
24.4 C (75.9 F)
-7.2 C (19.0 F)
Apr
28.3 C (82.9 F)
-7.8 C (18.0 F)
23.3 C (73.9 F)
-3.9 C (25.0 F)
May
31.1 C (88.0 F)
-4.4 C (24.1 F)
26.7 C (80.1 F)
0.0 C (32.0 F)
Jun
37.8 C (100.0 F)
0.0 C (32.0 F)
27.8 C (82.0 F)
3.3 C (37.9 F)
Jul
37.8 C (100.0 F)
-0.6 C (30.9 F)
34.4 C (93.9 F)
7.8 C (46.0 F)
Aug
39.4 C (102.9 F)
0.0 C (32.0 F)
n/a
n/a
Sep
35.6 C (96.1 F)
-3.9 C (25.0 F)
n/a
n/a
Oct
30.6 C (87.1 F)
-13.3 C (8.1 F)
n/a
n/a
Nov
20.0 C (68.0 F)
-20.6 C (-5.1 F)
n/a
n/a
Dec
15.0 C (59.0 F)
-27.8 C (-18.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Cottonwood 2 WSW still stand. 1985 holds the most, with 68.
Standing records at Cottonwood 2 WSW by the year they were set
Year set
Standing records
1976
1
1977
48
1978
29
1979
25
1980
42
1981
21
1982
31
1983
35
1984
40
1985
68
1986
47
1987
44
1988
36
1989
18
1990
38
1991
20
1992
47
1993
36
1994
20
1995
30
1996
44
1997
16
1998
18
1999
40
2000
18
2001
20
2002
43
2003
42
2004
14
2005
29
2006
25
2007
24
2008
37
2009
39
2010
9
2011
7
2013
16
2014
26
2015
39
2016
26
2017
26
2018
22
2019
22
2020
22
2021
19
2022
29
2023
23
2024
31
2025
35
2026
27
All-Time Record Progression
6 new records
6 all-time records were set at Cottonwood 2 WSW between 28 June 2015 and 25 February 2019. Each dot is a new record.
When Cottonwood 2 WSW set new all-time records
Date
Kind
Detail
2015-06-28
Record high maximum temperature
Record high maximum temperature 37.8 C (100.0 F)
2018-08-10
Record high maximum temperature
Record high maximum temperature 39.4 C (102.9 F)
2019-02-20
Record snow depth
Record snow depth 63.5 cm (25.0 in)
2019-02-21
Record snow depth
Record snow depth 66.0 cm (26.0 in)
2019-02-24
Record snow depth
Record snow depth 71.1 cm (28.0 in)
2019-02-25
Record snow depth
Record snow depth 81.3 cm (32.0 in)
Wettest Day of Each Month
Jan: 53.3 mm (2.1 in)
The wettest day on record for each calendar month at Cottonwood 2 WSW. The most was 53.3 mm (2.1 in) on 23 January 1982.
Record daily precipitation for each month at Cottonwood 2 WSW
Month
Record daily precipitation (mm)
Date
Jan
53.3 mm (2.1 in)
23 January 1982
Feb
32.0 mm (1.3 in)
23 February 1986
Mar
21.8 mm (0.9 in)
14 March 1984
Apr
43.2 mm (1.7 in)
27 April 1978
May
50.3 mm (2.0 in)
29 May 1990
Jun
31.2 mm (1.2 in)
15 June 1989
Jul
38.1 mm (1.5 in)
17 July 1987
Aug
35.3 mm (1.4 in)
21 August 2008
Sep
50.8 mm (2.0 in)
9 September 1998
Oct
27.4 mm (1.1 in)
25 October 1977
Nov
31.2 mm (1.2 in)
25 November 2014
Dec
38.1 mm (1.5 in)
2 December 1977
Period of Record Coverage
1976 to 2026
Complete yearUnder 90 percent of days
50 years of record at Cottonwood 2 WSW, 1976 to 2026. 6 years have data for under 90 percent of days and are left out of rankings: 1976, 2010, 2011, 2014, 2021, 2026.
Cooler than the station meanWarmer than the station mean
One stripe for each of 36 complete years at Cottonwood 2 WSW, 1978 to 2025. Blue stripes are years cooler than the station's own mean of 8.4 C (47.1 F); red stripes are warmer. The coolest year was 1985, at 6.5 C (43.7 F), and the warmest was 2025, at 10.0 C (50.0 F). The strongest colour marks a difference of 1.9 C (3.4 F).
Annual mean temperature at Cottonwood 2 WSW as warming stripes, 1978 to 2025
Year
Annual mean temperature
Difference from the station mean
1978
7.3 C
-1.09 C
1980
8.0 C
-0.43 C
1981
8.4 C
+0.02 C
1982
6.9 C
-1.50 C
1983
8.0 C
-0.34 C
1984
7.1 C
-1.25 C
1985
6.5 C
-1.89 C
1986
8.7 C
+0.30 C
1987
9.2 C
+0.84 C
1988
8.6 C
+0.25 C
1989
7.8 C
-0.60 C
1990
8.2 C
-0.19 C
1992
9.4 C
+1.02 C
1993
7.2 C
-1.22 C
1994
8.7 C
+0.33 C
1995
8.0 C
-0.36 C
1996
7.9 C
-0.48 C
1997
8.0 C
-0.41 C
1998
8.6 C
+0.24 C
2000
8.0 C
-0.43 C
2001
8.5 C
+0.11 C
2002
8.1 C
-0.24 C
2003
9.2 C
+0.82 C
2004
8.9 C
+0.47 C
2005
8.7 C
+0.29 C
2006
8.9 C
+0.50 C
2007
8.7 C
+0.36 C
2008
7.9 C
-0.51 C
2016
9.2 C
+0.83 C
2018
8.8 C
+0.45 C
2019
8.1 C
-0.31 C
2020
9.0 C
+0.60 C
2022
8.5 C
+0.07 C
2023
9.1 C
+0.67 C
2024
9.7 C
+1.31 C
2025
10.0 C
+1.63 C
The annual mean temperature here has risen by 0.3 C (0.2 to 0.5) per decade over 1978 to 2025. In Fahrenheit: 0.6 F (0.3 to 0.9) per decade. The slope is a straight line fitted to 36 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Cottonwood 2 WSW
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.3 C (0.2 to 0.5) per decade
0.6 F (0.3 to 0.9) per decade
1978 to 2025
36
Rise
Mean daily maximum
0.4 C (0.2 to 0.5) per decade
0.6 F (0.3 to 0.9) per decade
1978 to 2025
36
Rise
Mean daily minimum
0.3 C (0.2 to 0.4) per decade
0.5 F (0.3 to 0.8) per decade
1978 to 2025
36
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
1950 to 2026
Yearly extremes at Cottonwood 2 WSW: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
39.4 C (102.9 F)
2018
34.4 C (93.9 F)
50
Coldest night (TNn)
-28.9 C (-20.0 F)
1989
-17.8 C (0.0 F)
50
Wettest day (Rx1day)
53.3 mm (2.1 in)
1982
27.7 mm (1.1 in)
52
Wettest five days (Rx5day)
86.8 mm (3.4 in)
1990
46.8 mm (1.8 in)
52
Longest dry spell (CDD)
68 days
2007
28 days
52
Hottest day (TXx)
The hottest day of the year at Cottonwood 2 WSW, 1950 to 2026. The record is 39.4 C (102.9 F) in 2018, marked on the chart; the median year is 34.4 C (93.9 F).
Hottest day (TXx) at Cottonwood 2 WSW by year
Year
Hottest day (TXx)
1950
n/a
1951
n/a
1976
25.6 C (78.1 F)
1977
33.9 C (93.0 F)
1978
32.8 C (91.0 F)
1979
33.3 C (91.9 F)
1980
33.3 C (91.9 F)
1981
33.9 C (93.0 F)
1982
31.7 C (89.1 F)
1983
34.4 C (93.9 F)
1984
34.4 C (93.9 F)
1985
35.0 C (95.0 F)
1986
34.4 C (93.9 F)
1987
32.8 C (91.0 F)
1988
34.4 C (93.9 F)
1989
32.8 C (91.0 F)
1990
34.4 C (93.9 F)
1991
32.8 C (91.0 F)
1992
36.1 C (97.0 F)
1993
30.0 C (86.0 F)
1994
36.7 C (98.1 F)
1995
31.1 C (88.0 F)
1996
35.0 C (95.0 F)
1997
35.0 C (95.0 F)
1998
36.1 C (97.0 F)
1999
34.4 C (93.9 F)
2000
33.9 C (93.0 F)
2001
34.4 C (93.9 F)
2002
37.2 C (99.0 F)
2003
36.7 C (98.1 F)
2004
33.3 C (91.9 F)
2005
33.9 C (93.0 F)
2006
35.6 C (96.1 F)
2007
35.0 C (95.0 F)
2008
36.1 C (97.0 F)
2009
33.9 C (93.0 F)
2010
33.9 C (93.0 F)
2011
12.2 C (54.0 F)
2013
33.9 C (93.0 F)
2014
34.4 C (93.9 F)
2015
37.8 C (100.0 F)
2016
32.8 C (91.0 F)
2017
36.1 C (97.0 F)
2018
39.4 C (102.9 F)
2019
34.4 C (93.9 F)
2020
37.8 C (100.0 F)
2021
37.8 C (100.0 F)
2022
36.1 C (97.0 F)
2023
36.1 C (97.0 F)
2024
37.2 C (99.0 F)
2025
35.6 C (96.1 F)
2026
34.4 C (93.9 F)
Coldest night (TNn)
The coldest night of the year at Cottonwood 2 WSW, 1950 to 2026. The record is -28.9 C (-20.0 F) in 1989, marked on the chart; the median year is -17.8 C (0.0 F).
Coldest night (TNn) at Cottonwood 2 WSW by year
Year
Coldest night (TNn)
1950
n/a
1951
n/a
1976
-12.8 C (9.0 F)
1977
-15.0 C (5.0 F)
1978
-22.8 C (-9.0 F)
1979
-24.4 C (-11.9 F)
1980
-21.7 C (-7.1 F)
1981
-20.6 C (-5.1 F)
1982
-21.1 C (-6.0 F)
1983
-26.1 C (-15.0 F)
1984
-16.7 C (1.9 F)
1985
-20.6 C (-5.1 F)
1986
-13.9 C (7.0 F)
1987
-16.1 C (3.0 F)
1988
-17.8 C (0.0 F)
1989
-28.9 C (-20.0 F)
1990
-27.8 C (-18.0 F)
1991
-18.3 C (-0.9 F)
1992
-16.7 C (1.9 F)
1993
-18.3 C (-0.9 F)
1994
-16.1 C (3.0 F)
1995
-15.6 C (3.9 F)
1996
-21.7 C (-7.1 F)
1997
-16.7 C (1.9 F)
1998
-22.2 C (-8.0 F)
1999
-15.6 C (3.9 F)
2000
-12.2 C (10.0 F)
2001
-12.2 C (10.0 F)
2002
-12.8 C (9.0 F)
2003
-15.6 C (3.9 F)
2004
-23.9 C (-11.0 F)
2005
-16.1 C (3.0 F)
2006
-20.0 C (-4.0 F)
2007
-19.4 C (-2.9 F)
2008
-18.3 C (-0.9 F)
2009
-20.0 C (-4.0 F)
2010
-13.9 C (7.0 F)
2011
-18.3 C (-0.9 F)
2013
-12.2 C (10.0 F)
2014
-21.7 C (-7.1 F)
2015
-15.0 C (5.0 F)
2016
-17.8 C (0.0 F)
2017
-17.2 C (1.0 F)
2018
-16.1 C (3.0 F)
2019
-17.2 C (1.0 F)
2020
-12.2 C (10.0 F)
2021
-15.0 C (5.0 F)
2022
-21.1 C (-6.0 F)
2023
-18.3 C (-0.9 F)
2024
-27.2 C (-17.0 F)
2025
-18.3 C (-0.9 F)
2026
-11.1 C (12.0 F)
Wettest day (Rx1day)
The wettest day of the year at Cottonwood 2 WSW, 1950 to 2026. The record is 53.3 mm (2.1 in) in 1982, marked on the chart; the median year is 27.7 mm (1.1 in).
Wettest day (Rx1day) at Cottonwood 2 WSW by year
Year
Wettest day (Rx1day)
1950
20.8 mm (0.8 in)
1951
15.5 mm (0.6 in)
1976
12.7 mm (0.5 in)
1977
38.1 mm (1.5 in)
1978
43.2 mm (1.7 in)
1979
27.4 mm (1.1 in)
1980
23.9 mm (0.9 in)
1981
20.3 mm (0.8 in)
1982
53.3 mm (2.1 in)
1983
19.1 mm (0.8 in)
1984
21.8 mm (0.9 in)
1985
33.5 mm (1.3 in)
1986
32.0 mm (1.3 in)
1987
38.1 mm (1.5 in)
1988
30.0 mm (1.2 in)
1989
31.8 mm (1.3 in)
1990
50.3 mm (2.0 in)
1991
32.5 mm (1.3 in)
1992
32.3 mm (1.3 in)
1993
26.4 mm (1.0 in)
1994
19.1 mm (0.8 in)
1995
30.0 mm (1.2 in)
1996
24.1 mm (0.9 in)
1997
35.6 mm (1.4 in)
1998
50.8 mm (2.0 in)
1999
22.9 mm (0.9 in)
2000
23.1 mm (0.9 in)
2001
25.7 mm (1.0 in)
2002
21.1 mm (0.8 in)
2003
24.6 mm (1.0 in)
2004
27.2 mm (1.1 in)
2005
30.2 mm (1.2 in)
2006
25.4 mm (1.0 in)
2007
30.5 mm (1.2 in)
2008
35.3 mm (1.4 in)
2009
31.2 mm (1.2 in)
2010
20.8 mm (0.8 in)
2011
20.8 mm (0.8 in)
2013
26.9 mm (1.1 in)
2014
31.2 mm (1.2 in)
2015
29.2 mm (1.1 in)
2016
34.5 mm (1.4 in)
2017
29.5 mm (1.2 in)
2018
21.6 mm (0.9 in)
2019
31.2 mm (1.2 in)
2020
25.4 mm (1.0 in)
2021
27.4 mm (1.1 in)
2022
25.4 mm (1.0 in)
2023
27.9 mm (1.1 in)
2024
20.3 mm (0.8 in)
2025
27.9 mm (1.1 in)
2026
35.8 mm (1.4 in)
Wettest five days (Rx5day)
The wettest five days of the year at Cottonwood 2 WSW, 1950 to 2026. The record is 86.8 mm (3.4 in) in 1990, marked on the chart; the median year is 46.8 mm (1.8 in).
Wettest five days (Rx5day) at Cottonwood 2 WSW by year
Year
Wettest five days (Rx5day)
1950
33.4 mm (1.3 in)
1951
43.9 mm (1.7 in)
1976
22.9 mm (0.9 in)
1977
66.5 mm (2.6 in)
1978
47.5 mm (1.9 in)
1979
65.9 mm (2.6 in)
1980
45.4 mm (1.8 in)
1981
41.4 mm (1.6 in)
1982
64.9 mm (2.6 in)
1983
37.6 mm (1.5 in)
1984
38.6 mm (1.5 in)
1985
83.3 mm (3.3 in)
1986
54.1 mm (2.1 in)
1987
41.6 mm (1.6 in)
1988
55.9 mm (2.2 in)
1989
53.0 mm (2.1 in)
1990
86.8 mm (3.4 in)
1991
46.5 mm (1.8 in)
1992
36.1 mm (1.4 in)
1993
39.3 mm (1.5 in)
1994
43.0 mm (1.7 in)
1995
54.0 mm (2.1 in)
1996
53.1 mm (2.1 in)
1997
48.5 mm (1.9 in)
1998
71.6 mm (2.8 in)
1999
46.0 mm (1.8 in)
2000
40.9 mm (1.6 in)
2001
41.7 mm (1.6 in)
2002
32.3 mm (1.3 in)
2003
47.0 mm (1.9 in)
2004
64.8 mm (2.6 in)
2005
50.4 mm (2.0 in)
2006
57.4 mm (2.3 in)
2007
36.1 mm (1.4 in)
2008
40.1 mm (1.6 in)
2009
60.4 mm (2.4 in)
2010
57.7 mm (2.3 in)
2011
25.7 mm (1.0 in)
2013
42.3 mm (1.7 in)
2014
46.6 mm (1.8 in)
2015
48.8 mm (1.9 in)
2016
48.8 mm (1.9 in)
2017
46.0 mm (1.8 in)
2018
39.9 mm (1.6 in)
2019
72.9 mm (2.9 in)
2020
51.4 mm (2.0 in)
2021
46.2 mm (1.8 in)
2022
46.5 mm (1.8 in)
2023
65.3 mm (2.6 in)
2024
40.4 mm (1.6 in)
2025
49.7 mm (2.0 in)
2026
55.7 mm (2.2 in)
Longest dry spell (CDD)
The longest dry spell of the year at Cottonwood 2 WSW, 1950 to 2026. The record is 68 days in 2007, marked on the chart; the median year is 28 days.
Longest dry spell (CDD) at Cottonwood 2 WSW by year
Year
Longest dry spell (CDD)
1950
19 days
1951
28 days
1976
22 days
1977
38 days
1978
35 days
1979
26 days
1980
20 days
1981
43 days
1982
17 days
1983
20 days
1984
31 days
1985
31 days
1986
30 days
1987
44 days
1988
27 days
1989
16 days
1990
38 days
1991
46 days
1992
29 days
1993
22 days
1994
37 days
1995
20 days
1996
22 days
1997
16 days
1998
21 days
1999
26 days
2000
22 days
2001
54 days
2002
26 days
2003
25 days
2004
16 days
2005
52 days
2006
33 days
2007
68 days
2008
28 days
2009
32 days
2010
16 days
2011
3 days
2013
24 days
2014
25 days
2015
36 days
2016
23 days
2017
31 days
2018
56 days
2019
28 days
2020
30 days
2021
30 days
2022
32 days
2023
16 days
2024
27 days
2025
21 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
36 years with a frost
Across 36 years with a frost, the median last spring frost at Cottonwood 2 WSW falls on 9 May and the median first autumn frost on 8 October, which leaves a median of 151 days between them.
Fitted over all years, the growing season changes by +6.6 days per decade at this station.
Frost dates and growing season at Cottonwood 2 WSW
Measure
Median, all years
Earliest period
Recent period (1985 to 2025)
Recent against earliest
Fitted trend
Last spring frost
9 May
n/a
9 May
n/a
-2.8 days per decade
First autumn frost
8 October
n/a
9 October
n/a
+3.8 days per decade
Growing days
151 days
n/a
151 days
n/a
+6.6 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
44 years, 1977 to 2025
A day with at least 28.1 mm (1.1 in) of rain is expected about once in 2 years. A day with at least 57.9 mm (2.3 in) of rain is expected about once in 100 years.
Rainfall return levels at Cottonwood 2 WSW: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
28.1 mm (1.1 in)
5 years
35.1 mm (1.4 in)
10 years
40.1 mm (1.6 in)
25 years
46.9 mm (1.8 in)
50 years
52.2 mm (2.1 in)
Longer than the 44 years of record
100 years
57.9 mm (2.3 in)
Longer than the 44 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, 44 years of values from 1977 to 2025.
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: 53.3 mm (2.1 in) in 1982; 50.8 mm (2.0 in) in 1998; 50.3 mm (2.0 in) in 1990.
Download the Data
Data for Cottonwood 2 WSW standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Cottonwood 2 WSW 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.