Record envelope, standing records and threshold days for Cottonwood (USC00102154), Idaho, United States, with 84 years of record.
Key Facts for Cottonwood
Cottonwood (USC00102154) is a weather station in Idaho, United States at 46.02 latitude and -116.33 longitude, 1,040 m (3,412 ft) above sea level.
The station reports from 1893 to 1976, 84 years of record.
1,464 records set at Cottonwood still stand.
Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
Cottonwood tied a daily record high minimum temperature of 11.1 C (52.0 F) on 23 September 1976.
About the Station
Location: Idaho, United States, 46.02 latitude, -116.33 longitude.
Elevation: 1,040 m (3,412 ft).
Period of record: 1893 to 1976, 84 years.
Eligible elements: tmax, tmin, prcp, snow.
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 Cottonwood. 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 Cottonwood, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
14.4 C (57.9 F)
-33.9 C (-29.0 F)
n/a
n/a
Feb
17.2 C (63.0 F)
-33.3 C (-27.9 F)
n/a
n/a
Mar
22.2 C (72.0 F)
-26.1 C (-15.0 F)
n/a
n/a
Apr
28.9 C (84.0 F)
-15.6 C (3.9 F)
n/a
n/a
May
32.8 C (91.0 F)
-6.7 C (19.9 F)
n/a
n/a
Jun
35.6 C (96.1 F)
-3.3 C (26.1 F)
n/a
n/a
Jul
41.1 C (106.0 F)
-0.6 C (30.9 F)
n/a
n/a
Aug
38.9 C (102.0 F)
-1.1 C (30.0 F)
n/a
n/a
Sep
36.7 C (98.1 F)
-9.4 C (15.1 F)
n/a
n/a
Oct
30.0 C (86.0 F)
-16.1 C (3.0 F)
n/a
n/a
Nov
20.6 C (69.1 F)
-25.6 C (-14.1 F)
n/a
n/a
Dec
18.3 C (64.9 F)
-29.4 C (-20.9 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Cottonwood still stand. 1916 holds the most, with 59.
Standing records at Cottonwood by the year they were set
Year set
Standing records
1893
8
1913
30
1914
45
1915
38
1916
59
1917
46
1918
53
1919
49
1920
39
1921
37
1922
49
1923
17
1924
44
1925
14
1926
23
1927
19
1928
26
1929
6
1931
22
1932
32
1933
31
1934
58
1935
40
1936
51
1937
37
1938
16
1939
40
1940
20
1941
23
1942
16
1943
28
1944
13
1945
12
1946
13
1947
11
1948
18
1949
29
1950
35
1951
11
1952
9
1953
21
1954
31
1955
28
1956
17
1957
13
1958
11
1959
13
1960
18
1961
15
1962
27
1963
24
1964
11
1972
17
1973
12
1974
14
1975
20
1976
5
Wettest Day of Each Month
Sep: 53.8 mm (2.1 in)
The wettest day on record for each calendar month at Cottonwood. The most was 53.8 mm (2.1 in) on 23 September 1917.
Record daily precipitation for each month at Cottonwood
Month
Record daily precipitation (mm)
Date
Jan
42.7 mm (1.7 in)
26 January 1920
Feb
36.8 mm (1.4 in)
7 February 1938
Mar
25.4 mm (1.0 in)
13 March 1923
Apr
32.8 mm (1.3 in)
9 April 1918
May
41.9 mm (1.6 in)
9 May 1957
Jun
52.1 mm (2.1 in)
24 June 1958
Jul
43.9 mm (1.7 in)
2 July 1916
Aug
47.5 mm (1.9 in)
1 August 1948
Sep
53.8 mm (2.1 in)
23 September 1917
Oct
39.4 mm (1.6 in)
12 October 1962
Nov
38.1 mm (1.5 in)
6 November 1926
Dec
32.8 mm (1.3 in)
19 December 1917
Period of Record Coverage
1893 to 1976
Complete yearUnder 90 percent of days
57 years of record at Cottonwood, 1893 to 1976. 10 years have data for under 90 percent of days and are left out of rankings: 1893, 1913, 1929, 1931, 1942, 1943, 1950, 1964 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 44 complete years at Cottonwood, 1914 to 1975. Blue stripes are years cooler than the station's own mean of 7.5 C (45.5 F); red stripes are warmer. The coolest year was 1955, at 5.6 C (42.0 F), and the warmest was 1934, at 9.5 C (49.2 F). The strongest colour marks a difference of 2.1 C (3.8 F).
Annual mean temperature at Cottonwood as warming stripes, 1914 to 1975
Year
Annual mean temperature
Difference from the station mean
1914
8.2 C
+0.71 C
1915
8.0 C
+0.47 C
1916
6.1 C
-1.44 C
1917
7.5 C
-0.04 C
1918
7.9 C
+0.44 C
1919
7.5 C
-0.04 C
1920
7.2 C
-0.32 C
1921
7.8 C
+0.29 C
1922
7.3 C
-0.24 C
1923
7.3 C
-0.15 C
1924
7.4 C
-0.05 C
1925
8.4 C
+0.90 C
1926
8.2 C
+0.68 C
1928
8.1 C
+0.57 C
1932
6.7 C
-0.77 C
1933
7.2 C
-0.27 C
1934
9.5 C
+2.04 C
1935
7.0 C
-0.48 C
1936
7.6 C
+0.12 C
1937
7.1 C
-0.35 C
1938
8.0 C
+0.52 C
1939
8.4 C
+0.86 C
1940
8.7 C
+1.25 C
1941
8.1 C
+0.60 C
1944
7.4 C
-0.09 C
1945
7.4 C
-0.05 C
1946
6.9 C
-0.63 C
1947
7.5 C
+0.01 C
1948
6.1 C
-1.43 C
1951
6.8 C
-0.71 C
1952
7.2 C
-0.29 C
1953
7.9 C
+0.38 C
1954
6.7 C
-0.81 C
1955
5.6 C
-1.93 C
1956
7.0 C
-0.46 C
1957
6.9 C
-0.59 C
1958
8.4 C
+0.94 C
1959
7.0 C
-0.52 C
1960
7.2 C
-0.31 C
1961
7.8 C
+0.28 C
1962
7.2 C
-0.29 C
1963
8.0 C
+0.48 C
1974
8.4 C
+0.87 C
1975
7.2 C
-0.33 C
The fitted trend in annual mean temperature here over 1914 to 1975 is -0.1 C (-0.2 to 0.1) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.1 F (-0.4 to 0.1) per decade. The slope is a straight line fitted to 44 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Cottonwood
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.1 C (-0.2 to 0.1) per decade
-0.1 F (-0.4 to 0.1) per decade
1914 to 1975
44
Not clearly different from zero
Mean daily maximum
0.23 C (0.02 to 0.44) per decade
0.41 F (0.03 to 0.80) per decade
1914 to 1975
44
Rise
Mean daily minimum
-0.4 C (-0.5 to -0.2) per decade
-0.6 F (-0.9 to -0.3) per decade
1914 to 1975
44
Fall
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
1893 to 1976
Yearly extremes at Cottonwood: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
41.1 C (106.0 F)
1934
35.6 C (96.1 F)
57
Coldest night (TNn)
-33.9 C (-29.0 F)
1937
-22.2 C (-8.0 F)
57
Wettest day (Rx1day)
53.8 mm (2.1 in)
1917
28.7 mm (1.1 in)
57
Wettest five days (Rx5day)
89.4 mm (3.5 in)
1956
47.8 mm (1.9 in)
57
Longest dry spell (CDD)
63 days
1936
26 days
57
Hottest day (TXx)
The hottest day of the year at Cottonwood, 1893 to 1976. The record is 41.1 C (106.0 F) in 1934, marked on the chart; the median year is 35.6 C (96.1 F).
Hottest day (TXx) at Cottonwood by year
Year
Hottest day (TXx)
1893
37.2 C (99.0 F)
1913
31.7 C (89.1 F)
1914
33.9 C (93.0 F)
1915
33.3 C (91.9 F)
1916
31.7 C (89.1 F)
1917
32.2 C (90.0 F)
1918
35.0 C (95.0 F)
1919
36.1 C (97.0 F)
1920
36.7 C (98.1 F)
1921
31.7 C (89.1 F)
1922
34.4 C (93.9 F)
1923
34.4 C (93.9 F)
1924
35.6 C (96.1 F)
1925
36.1 C (97.0 F)
1926
37.2 C (99.0 F)
1927
33.9 C (93.0 F)
1928
38.9 C (102.0 F)
1929
16.1 C (61.0 F)
1931
25.0 C (77.0 F)
1932
34.4 C (93.9 F)
1933
37.8 C (100.0 F)
1934
41.1 C (106.0 F)
1935
37.8 C (100.0 F)
1936
38.3 C (100.9 F)
1937
36.7 C (98.1 F)
1938
37.2 C (99.0 F)
1939
37.8 C (100.0 F)
1940
37.2 C (99.0 F)
1941
36.1 C (97.0 F)
1942
36.7 C (98.1 F)
1943
32.8 C (91.0 F)
1944
35.0 C (95.0 F)
1945
36.7 C (98.1 F)
1946
35.6 C (96.1 F)
1947
36.1 C (97.0 F)
1948
33.3 C (91.9 F)
1949
37.2 C (99.0 F)
1950
35.0 C (95.0 F)
1951
36.1 C (97.0 F)
1952
33.9 C (93.0 F)
1953
37.2 C (99.0 F)
1954
32.2 C (90.0 F)
1955
36.7 C (98.1 F)
1956
34.4 C (93.9 F)
1957
33.3 C (91.9 F)
1958
35.6 C (96.1 F)
1959
37.2 C (99.0 F)
1960
37.2 C (99.0 F)
1961
38.9 C (102.0 F)
1962
34.4 C (93.9 F)
1963
34.4 C (93.9 F)
1964
35.0 C (95.0 F)
1972
36.7 C (98.1 F)
1973
36.1 C (97.0 F)
1974
34.4 C (93.9 F)
1975
36.1 C (97.0 F)
1976
32.2 C (90.0 F)
Coldest night (TNn)
The coldest night of the year at Cottonwood, 1893 to 1976. The record is -33.9 C (-29.0 F) in 1937, marked on the chart; the median year is -22.2 C (-8.0 F).
Coldest night (TNn) at Cottonwood by year
Year
Coldest night (TNn)
1893
-1.7 C (28.9 F)
1913
-15.6 C (3.9 F)
1914
-20.0 C (-4.0 F)
1915
-19.4 C (-2.9 F)
1916
-21.7 C (-7.1 F)
1917
-16.1 C (3.0 F)
1918
-21.7 C (-7.1 F)
1919
-25.0 C (-13.0 F)
1920
-18.3 C (-0.9 F)
1921
-16.1 C (3.0 F)
1922
-21.1 C (-6.0 F)
1923
-22.2 C (-8.0 F)
1924
-29.4 C (-20.9 F)
1925
-10.6 C (12.9 F)
1926
-17.8 C (0.0 F)
1927
-27.8 C (-18.0 F)
1928
-22.8 C (-9.0 F)
1929
-26.1 C (-15.0 F)
1931
-22.8 C (-9.0 F)
1932
-26.7 C (-16.1 F)
1933
-29.4 C (-20.9 F)
1934
-15.6 C (3.9 F)
1935
-31.7 C (-25.1 F)
1936
-33.3 C (-27.9 F)
1937
-33.9 C (-29.0 F)
1938
-16.7 C (1.9 F)
1939
-23.3 C (-9.9 F)
1940
-19.4 C (-2.9 F)
1941
-16.7 C (1.9 F)
1942
-27.8 C (-18.0 F)
1943
-16.7 C (1.9 F)
1944
-16.7 C (1.9 F)
1945
-21.1 C (-6.0 F)
1946
-16.7 C (1.9 F)
1947
-23.9 C (-11.0 F)
1948
-23.3 C (-9.9 F)
1949
-29.4 C (-20.9 F)
1950
-30.6 C (-23.1 F)
1951
-26.1 C (-15.0 F)
1952
-21.7 C (-7.1 F)
1953
-12.8 C (9.0 F)
1954
-27.8 C (-18.0 F)
1955
-26.1 C (-15.0 F)
1956
-26.7 C (-16.1 F)
1957
-29.4 C (-20.9 F)
1958
-16.1 C (3.0 F)
1959
-26.1 C (-15.0 F)
1960
-21.7 C (-7.1 F)
1961
-25.0 C (-13.0 F)
1962
-26.1 C (-15.0 F)
1963
-30.6 C (-23.1 F)
1964
-14.4 C (6.1 F)
1972
-27.2 C (-17.0 F)
1973
-22.2 C (-8.0 F)
1974
-22.2 C (-8.0 F)
1975
-19.4 C (-2.9 F)
1976
-18.9 C (-2.0 F)
Wettest day (Rx1day)
The wettest day of the year at Cottonwood, 1893 to 1976. The record is 53.8 mm (2.1 in) in 1917, marked on the chart; the median year is 28.7 mm (1.1 in).
Wettest day (Rx1day) at Cottonwood by year
Year
Wettest day (Rx1day)
1893
15.7 mm (0.6 in)
1913
25.7 mm (1.0 in)
1914
21.6 mm (0.9 in)
1915
25.4 mm (1.0 in)
1916
43.9 mm (1.7 in)
1917
53.8 mm (2.1 in)
1918
32.8 mm (1.3 in)
1919
23.4 mm (0.9 in)
1920
42.7 mm (1.7 in)
1921
29.2 mm (1.1 in)
1922
21.6 mm (0.9 in)
1923
35.3 mm (1.4 in)
1924
27.9 mm (1.1 in)
1925
25.4 mm (1.0 in)
1926
38.1 mm (1.5 in)
1927
22.1 mm (0.9 in)
1928
25.4 mm (1.0 in)
1929
20.3 mm (0.8 in)
1931
10.2 mm (0.4 in)
1932
27.4 mm (1.1 in)
1933
28.7 mm (1.1 in)
1934
23.4 mm (0.9 in)
1935
24.6 mm (1.0 in)
1936
30.5 mm (1.2 in)
1937
29.5 mm (1.2 in)
1938
36.8 mm (1.4 in)
1939
15.7 mm (0.6 in)
1940
30.5 mm (1.2 in)
1941
24.6 mm (1.0 in)
1942
17.5 mm (0.7 in)
1943
33.0 mm (1.3 in)
1944
17.5 mm (0.7 in)
1945
25.9 mm (1.0 in)
1946
23.6 mm (0.9 in)
1947
21.6 mm (0.9 in)
1948
47.5 mm (1.9 in)
1949
33.0 mm (1.3 in)
1950
23.9 mm (0.9 in)
1951
38.9 mm (1.5 in)
1952
37.8 mm (1.5 in)
1953
31.5 mm (1.2 in)
1954
30.5 mm (1.2 in)
1955
33.0 mm (1.3 in)
1956
41.1 mm (1.6 in)
1957
41.9 mm (1.6 in)
1958
52.1 mm (2.1 in)
1959
34.3 mm (1.4 in)
1960
39.1 mm (1.5 in)
1961
27.2 mm (1.1 in)
1962
39.4 mm (1.6 in)
1963
29.2 mm (1.1 in)
1964
21.3 mm (0.8 in)
1972
21.6 mm (0.9 in)
1973
32.5 mm (1.3 in)
1974
16.8 mm (0.7 in)
1975
38.4 mm (1.5 in)
1976
20.1 mm (0.8 in)
Wettest five days (Rx5day)
The wettest five days of the year at Cottonwood, 1893 to 1976. The record is 89.4 mm (3.5 in) in 1956, marked on the chart; the median year is 47.8 mm (1.9 in).
Wettest five days (Rx5day) at Cottonwood by year
Year
Wettest five days (Rx5day)
1893
27.7 mm (1.1 in)
1913
55.5 mm (2.2 in)
1914
38.6 mm (1.5 in)
1915
65.7 mm (2.6 in)
1916
69.0 mm (2.7 in)
1917
87.8 mm (3.5 in)
1918
44.2 mm (1.7 in)
1919
37.9 mm (1.5 in)
1920
52.4 mm (2.1 in)
1921
82.7 mm (3.3 in)
1922
44.6 mm (1.8 in)
1923
68.8 mm (2.7 in)
1924
70.1 mm (2.8 in)
1925
41.4 mm (1.6 in)
1926
43.3 mm (1.7 in)
1927
48.5 mm (1.9 in)
1928
42.0 mm (1.7 in)
1929
30.4 mm (1.2 in)
1931
26.4 mm (1.0 in)
1932
40.4 mm (1.6 in)
1933
54.1 mm (2.1 in)
1934
35.5 mm (1.4 in)
1935
31.8 mm (1.3 in)
1936
56.4 mm (2.2 in)
1937
45.1 mm (1.8 in)
1938
40.8 mm (1.6 in)
1939
32.5 mm (1.3 in)
1940
60.2 mm (2.4 in)
1941
49.0 mm (1.9 in)
1942
39.9 mm (1.6 in)
1943
47.0 mm (1.9 in)
1944
35.5 mm (1.4 in)
1945
47.0 mm (1.9 in)
1946
66.1 mm (2.6 in)
1947
41.2 mm (1.6 in)
1948
66.6 mm (2.6 in)
1949
68.5 mm (2.7 in)
1950
43.0 mm (1.7 in)
1951
43.0 mm (1.7 in)
1952
53.1 mm (2.1 in)
1953
66.6 mm (2.6 in)
1954
62.3 mm (2.5 in)
1955
38.1 mm (1.5 in)
1956
89.4 mm (3.5 in)
1957
67.5 mm (2.7 in)
1958
55.4 mm (2.2 in)
1959
39.5 mm (1.6 in)
1960
40.6 mm (1.6 in)
1961
47.8 mm (1.9 in)
1962
78.1 mm (3.1 in)
1963
47.8 mm (1.9 in)
1964
55.8 mm (2.2 in)
1972
33.1 mm (1.3 in)
1973
53.7 mm (2.1 in)
1974
25.9 mm (1.0 in)
1975
54.7 mm (2.2 in)
1976
50.4 mm (2.0 in)
Longest dry spell (CDD)
The longest dry spell of the year at Cottonwood, 1893 to 1976. The record is 63 days in 1936, marked on the chart; the median year is 26 days.
Longest dry spell (CDD) at Cottonwood by year
Year
Longest dry spell (CDD)
1893
31 days
1913
21 days
1914
48 days
1915
17 days
1916
19 days
1917
50 days
1918
24 days
1919
35 days
1920
20 days
1921
22 days
1922
21 days
1923
26 days
1924
26 days
1925
19 days
1926
33 days
1927
29 days
1928
39 days
1929
19 days
1931
24 days
1932
38 days
1933
30 days
1934
62 days
1935
25 days
1936
63 days
1937
25 days
1938
20 days
1939
44 days
1940
26 days
1941
15 days
1942
18 days
1943
32 days
1944
46 days
1945
23 days
1946
29 days
1947
39 days
1948
28 days
1949
36 days
1950
19 days
1951
28 days
1952
40 days
1953
32 days
1954
29 days
1955
47 days
1956
24 days
1957
20 days
1958
40 days
1959
26 days
1960
29 days
1961
31 days
1962
31 days
1963
23 days
1964
16 days
1972
20 days
1973
20 days
1974
39 days
1975
17 days
1976
22 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
44 years with a frost
Across 44 years with a frost, the median last spring frost at Cottonwood falls on 29 May and the median first autumn frost on 20 September, which leaves a median of 116 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 Cottonwood
Measure
Median, all years
Earliest period
Recent period (1932 to 1975)
Recent against earliest
Fitted trend
Last spring frost
29 May
n/a
28 May
n/a
-2.0 days per decade
First autumn frost
20 September
n/a
16 September
n/a
-2.2 days per decade
Growing days
116 days
n/a
113 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
47 years, 1914 to 1975
A day with at least 30.3 mm (1.2 in) of rain is expected about once in 2 years. A day with at least 56.8 mm (2.2 in) of rain is expected about once in 100 years.
Rainfall return levels at Cottonwood: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
30.3 mm (1.2 in)
5 years
38.4 mm (1.5 in)
10 years
43.3 mm (1.7 in)
25 years
49.1 mm (1.9 in)
50 years
53.1 mm (2.1 in)
Longer than the 47 years of record
100 years
56.8 mm (2.2 in)
Longer than the 47 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, 47 years of values from 1914 to 1975.
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: 53.8 mm (2.1 in) in 1917; 52.1 mm (2.1 in) in 1958; 47.5 mm (1.9 in) in 1948.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Download the Data
Data for Cottonwood standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Cottonwood 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 2026-10-13 (13 October 2026). Records are computed by this site and are not official.