Cottonwood Weather Records (USC00102154)

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

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

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

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.

Days with data per year at Cottonwood
Year	Days with data	Share of year	Complete
1893	40	11%	No
1913	306	84%	No
1914	364	100%	Yes
1915	364	100%	Yes
1916	364	99%	Yes
1917	361	99%	Yes
1918	365	100%	Yes
1919	363	99%	Yes
1920	365	100%	Yes
1921	365	100%	Yes
1922	362	99%	Yes
1923	359	98%	Yes
1924	366	100%	Yes
1925	365	100%	Yes
1926	364	100%	Yes
1927	349	96%	Yes
1928	365	100%	Yes
1929	106	29%	No
1931	92	25%	No
1932	364	99%	Yes
1933	364	100%	Yes
1934	361	99%	Yes
1935	360	99%	Yes
1936	363	99%	Yes
1937	363	99%	Yes
1938	361	99%	Yes
1939	365	100%	Yes
1940	365	100%	Yes
1941	365	100%	Yes
1942	235	64%	No
1943	305	84%	No
1944	363	99%	Yes
1945	364	100%	Yes
1946	364	100%	Yes
1947	364	100%	Yes
1948	363	99%	Yes
1949	365	100%	Yes
1950	318	87%	No
1951	365	100%	Yes
1952	365	100%	Yes
1953	364	100%	Yes
1954	365	100%	Yes
1955	362	99%	Yes
1956	356	97%	Yes
1957	364	100%	Yes
1958	361	99%	Yes
1959	360	99%	Yes
1960	364	99%	Yes
1961	363	99%	Yes
1962	359	98%	Yes
1963	362	99%	Yes
1964	305	83%	No
1972	244	67%	No
1973	335	92%	Yes
1974	365	100%	Yes
1975	364	100%	Yes
1976	116	32%	No

Latest Records

Latest records at Cottonwood
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
23 September 1976	Cottonwood, US	daily high min (Tie)	11.1 C (52.0 F)	tie	38 years	4 of 100 (Routine)
22 September 1976	Cottonwood, US	daily high min	13.3 C (55.9 F)	1.6 C (2.9 F)	61 years	29 of 100 (Routine)
6 September 1976	Cottonwood, US	daily rain	6.9 mm (0.27 in)	0.5 mm (0.02 in)	37 years	19 of 100 (Routine)
5 February 1976	Cottonwood, US	daily low min	-18.9 C (-2.0 F)	0.6 C (1.1 F)	61 years	27 of 100 (Routine)
5 February 1976	Cottonwood, US	daily low max	-7.2 C (19.0 F)	1.6 C (2.9 F)	26 years	19 of 100 (Routine)
28 January 1976	Cottonwood, US	daily high max	13.9 C (57.0 F)	2.8 C (5.0 F)	56 years	29 of 100 (Routine)
27 January 1976	Cottonwood, US	daily high max	11.7 C (53.1 F)	0.6 C (1.1 F)	41 years	21 of 100 (Routine)
14 January 1976	Cottonwood, US	daily rain	15.7 mm (0.6 in)	6.3 mm (0.25 in)	24 years	20 of 100 (Routine)
8 January 1976	Cottonwood, US	daily rain	11.9 mm (0.5 in)	2.2 mm (0.09 in)	36 years	20 of 100 (Routine)
5 January 1976	Cottonwood, US	daily rain	20.1 mm (0.8 in)	9.9 mm (0.39 in)	52 years	20 of 100 (Routine)
26 December 1975	Cottonwood, US	daily rain	14.0 mm (0.6 in)	6.4 mm (0.25 in)	60 years	20 of 100 (Routine)
9 December 1975	Cottonwood, US	daily high max	12.8 C (55.0 F)	3.4 C (6.1 F)	17 years	20 of 100 (Routine)
9 December 1975	Cottonwood, US	daily high min (Tie)	2.2 C (36.0 F)	tie	36 years	4 of 100 (Routine)
7 December 1975	Cottonwood, US	daily rain	23.1 mm (0.9 in)	8.6 mm (0.34 in)	16 years	20 of 100 (Routine)
3 December 1975	Cottonwood, US	monthly high min	8.3 C (46.9 F)	1.6 C (2.9 F)	57 years	37 of 100 (Notable)
2 December 1975	Cottonwood, US	daily high min	5.0 C (41.0 F)	1.1 C (2.0 F)	48 years	23 of 100 (Routine)
1 December 1975	Cottonwood, US	daily rain	26.2 mm (1.0 in)	14.0 mm (0.6 in)	57 years	57 of 100 (Notable)
30 November 1975	Cottonwood, US	daily rain	21.6 mm (0.9 in)	2.5 mm (0.10 in)	53 years	20 of 100 (Routine)
29 November 1975	Cottonwood, US	daily low max	-6.7 C (19.9 F)	0.6 C (1.1 F)	44 years	22 of 100 (Routine)
5 November 1975	Cottonwood, US	daily high max	18.9 C (66.0 F)	1.7 C (3.1 F)	40 years	23 of 100 (Routine)

Climate Trend

44 complete years, 1914 to 1975

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 2026-10-17 (17 October 2026). Records are computed by this site and are not official.

Data as of 2025-12-31. Last revised 31 December 2025 (2025-12-31).