Lake Kachess Weather Records (USC00454406)

Record envelope, standing records and threshold days for Lake Kachess (USC00454406), Washington, United States, with 70 years of record.

Key Facts for Lake Kachess

Lake Kachess (USC00454406) is a weather station in Washington, United States at 47.27 latitude and -121.20 longitude, 692 m (2,270 ft) above sea level.
The station reports from 1908 to 1977, 70 years of record.
1,464 records set at Lake Kachess still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Lake Kachess set a daily record low maximum temperature of 12.8 C (55.0 F) on 30 August 1977.

About the Station

Location: Washington, United States, 47.27 latitude, -121.20 longitude.
Elevation: 692 m (2,270 ft).
Period of record: 1908 to 1977, 70 years.
Eligible elements: tmax, tmin, prcp, snow, snwd.

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 Lake Kachess. 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 Lake Kachess, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	11.7 C (53.1 F)	-36.1 C (-33.0 F)	n/a	n/a
Feb	15.6 C (60.1 F)	-35.0 C (-31.0 F)	n/a	n/a
Mar	22.2 C (72.0 F)	-22.2 C (-8.0 F)	n/a	n/a
Apr	31.1 C (88.0 F)	-11.7 C (10.9 F)	n/a	n/a
May	32.8 C (91.0 F)	-6.1 C (21.0 F)	n/a	n/a
Jun	36.7 C (98.1 F)	-1.7 C (28.9 F)	n/a	n/a
Jul	40.0 C (104.0 F)	0.0 C (32.0 F)	n/a	n/a
Aug	38.9 C (102.0 F)	-2.2 C (28.0 F)	n/a	n/a
Sep	36.7 C (98.1 F)	-6.1 C (21.0 F)	n/a	n/a
Oct	29.4 C (84.9 F)	-11.1 C (12.0 F)	n/a	n/a
Nov	18.3 C (64.9 F)	-18.9 C (-2.0 F)	n/a	n/a
Dec	15.6 C (60.1 F)	-28.9 C (-20.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Lake Kachess still stand. 1955 holds the most, with 44.

Standing records at Lake Kachess by the year they were set
Year set	Standing records
1908	28
1909	30
1910	19
1911	33
1912	12
1913	24
1914	12
1915	16
1916	25
1917	28
1918	17
1919	39
1920	25
1921	19
1922	19
1923	14
1924	40
1925	18
1926	29
1927	20
1928	14
1929	22
1930	23
1931	34
1932	20
1933	29
1934	38
1935	33
1936	32
1937	12
1938	16
1939	25
1940	18
1941	18
1942	14
1943	7
1944	19
1945	22
1946	6
1947	19
1948	13
1949	24
1950	37
1951	9
1952	25
1953	17
1954	12
1955	44
1956	23
1957	9
1958	21
1959	9
1960	10
1961	14
1962	23
1963	27
1964	14
1965	17
1966	11
1967	16
1968	28
1969	21
1970	17
1971	22
1972	15
1973	20
1974	23
1975	14
1976	20
1977	21

All-Time Record Progression

9 new records

9 all-time records were set at Lake Kachess between 27 July 1939 and 31 January 1950. Each dot is a new record.

When Lake Kachess set new all-time records
Date	Kind	Detail
1939-07-27	Record high maximum temperature	Record high maximum temperature 39.4 C (102.9 F)
1939-07-28	Record high maximum temperature	Record high maximum temperature 40.0 C (104.0 F)
1949-01-10	Record low minimum temperature	Record low minimum temperature -28.3 C (-18.9 F)
1949-01-24	Record low minimum temperature	Record low minimum temperature -29.4 C (-20.9 F)
1949-01-25	Record low minimum temperature	Record low minimum temperature -30.0 C (-22.0 F)
1950-01-25	Record low minimum temperature	Record low minimum temperature -30.6 C (-23.1 F)
1950-01-26	Record low minimum temperature	Record low minimum temperature -31.1 C (-24.0 F)
1950-01-30	Record low minimum temperature	Record low minimum temperature -35.0 C (-31.0 F)
1950-01-31	Record low minimum temperature	Record low minimum temperature -36.1 C (-33.0 F)

Wettest Day of Each Month

Oct: 132.3 mm (5.2 in)

The wettest day on record for each calendar month at Lake Kachess. The most was 132.3 mm (5.2 in) on 25 October 1934.

Record daily precipitation for each month at Lake Kachess
Month	Record daily precipitation (mm)	Date
Jan	112.8 mm (4.4 in)	6 January 1923
Feb	90.2 mm (3.6 in)	26 February 1932
Mar	79.5 mm (3.1 in)	27 March 1936
Apr	64.0 mm (2.5 in)	7 April 1962
May	45.5 mm (1.8 in)	16 May 1921
Jun	36.1 mm (1.4 in)	5 June 1974
Jul	39.6 mm (1.6 in)	5 July 1961
Aug	37.8 mm (1.5 in)	30 August 1920
Sep	54.1 mm (2.1 in)	27 September 1959
Oct	132.3 mm (5.2 in)	25 October 1934
Nov	110.5 mm (4.4 in)	20 November 1962
Dec	116.1 mm (4.6 in)	6 December 1933

Period of Record Coverage

1908 to 1977

70 years of record at Lake Kachess, 1908 to 1977. 5 years have data for under 90 percent of days and are left out of rankings: 1908, 1909, 1971, 1972, 1977.

Days with data per year at Lake Kachess
Year	Days with data	Share of year	Complete
1908	223	61%	No
1909	321	88%	No
1910	343	94%	Yes
1911	344	94%	Yes
1912	359	98%	Yes
1913	358	98%	Yes
1914	364	100%	Yes
1915	365	100%	Yes
1916	366	100%	Yes
1917	349	96%	Yes
1918	364	100%	Yes
1919	364	100%	Yes
1920	359	98%	Yes
1921	342	94%	Yes
1922	338	93%	Yes
1923	360	99%	Yes
1924	366	100%	Yes
1925	363	99%	Yes
1926	365	100%	Yes
1927	334	92%	Yes
1928	366	100%	Yes
1929	360	99%	Yes
1930	365	100%	Yes
1931	365	100%	Yes
1932	365	100%	Yes
1933	365	100%	Yes
1934	364	100%	Yes
1935	363	99%	Yes
1936	357	98%	Yes
1937	354	97%	Yes
1938	365	100%	Yes
1939	365	100%	Yes
1940	366	100%	Yes
1941	365	100%	Yes
1942	365	100%	Yes
1943	364	100%	Yes
1944	366	100%	Yes
1945	365	100%	Yes
1946	363	99%	Yes
1947	365	100%	Yes
1948	365	100%	Yes
1949	355	97%	Yes
1950	363	99%	Yes
1951	355	97%	Yes
1952	358	98%	Yes
1953	364	100%	Yes
1954	362	99%	Yes
1955	365	100%	Yes
1956	356	97%	Yes
1957	365	100%	Yes
1958	357	98%	Yes
1959	343	94%	Yes
1960	361	99%	Yes
1961	365	100%	Yes
1962	357	98%	Yes
1963	364	100%	Yes
1964	366	100%	Yes
1965	365	100%	Yes
1966	365	100%	Yes
1967	365	100%	Yes
1968	361	99%	Yes
1969	349	96%	Yes
1970	340	93%	Yes
1971	327	90%	No
1972	322	88%	No
1973	361	99%	Yes
1974	362	99%	Yes
1975	333	91%	Yes
1976	353	96%	Yes
1977	236	65%	No

Latest Records

Latest records at Lake Kachess
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
30 August 1977	Lake Kachess, US	daily low max	12.8 C (55.0 F)	0.5 C (0.9 F)	68 years	27 of 100 (Routine)
26 August 1977	Lake Kachess, US	daily low max (Tie)	12.2 C (54.0 F)	tie	16 years	3 of 100 (Routine)
21 August 1977	Lake Kachess, US	daily high max	36.7 C (98.1 F)	1.1 C (2.0 F)	52 years	23 of 100 (Routine)
20 August 1977	Lake Kachess, US	daily high max (Tie)	36.1 C (97.0 F)	tie	36 years	4 of 100 (Routine)
19 August 1977	Lake Kachess, US	daily high min (Tie)	13.3 C (55.9 F)	tie	44 years	5 of 100 (Routine)
18 August 1977	Lake Kachess, US	daily high max	36.7 C (98.1 F)	2.8 C (5.0 F)	68 years	32 of 100 (Routine)
17 August 1977	Lake Kachess, US	daily high max	36.1 C (97.0 F)	1.1 C (2.0 F)	54 years	24 of 100 (Routine)
13 August 1977	Lake Kachess, US	daily high max (Tie)	35.6 C (96.1 F)	tie	4 years	2 of 100 (Routine)
18 July 1977	Lake Kachess, US	daily low min	3.3 C (37.9 F)	0.6 C (1.1 F)	32 years	18 of 100 (Routine)
24 June 1977	Lake Kachess, US	daily high min	14.4 C (57.9 F)	1.6 C (2.9 F)	64 years	31 of 100 (Routine)
7 June 1977	Lake Kachess, US	daily high min	14.4 C (57.9 F)	2.7 C (4.9 F)	8 years	18 of 100 (Routine)
27 May 1977	Lake Kachess, US	daily low min (Tie)	-1.7 C (28.9 F)	tie	55 years	5 of 100 (Routine)
21 May 1977	Lake Kachess, US	daily high min (Tie)	8.3 C (46.9 F)	tie	52 years	5 of 100 (Routine)
12 May 1977	Lake Kachess, US	daily low min (Tie)	-2.2 C (28.0 F)	tie	60 years	6 of 100 (Routine)
25 April 1977	Lake Kachess, US	monthly high min	10.6 C (51.1 F)	0.6 C (1.1 F)	43 years	31 of 100 (Routine)
25 April 1977	Lake Kachess, US	monthly high max (Tie)	31.1 C (88.0 F)	tie	43 years	7 of 100 (Routine)
24 April 1977	Lake Kachess, US	daily high max	27.8 C (82.0 F)	1.7 C (3.1 F)	67 years	30 of 100 (Routine)
17 April 1977	Lake Kachess, US	daily low max	2.2 C (36.0 F)	0.6 C (1.1 F)	4 years	9 of 100 (Routine)
8 April 1977	Lake Kachess, US	daily high max	25.6 C (78.1 F)	2.3 C (4.1 F)	43 years	23 of 100 (Routine)
7 April 1977	Lake Kachess, US	daily high max (Tie)	24.4 C (75.9 F)	tie	43 years	4 of 100 (Routine)

Climate Trend

57 complete years, 1912 to 1976

One stripe for each of 57 complete years at Lake Kachess, 1912 to 1976. Blue stripes are years cooler than the station's own mean of 6.9 C (44.4 F); red stripes are warmer. The coolest year was 1955, at 4.7 C (40.4 F), and the warmest was 1934, at 9.0 C (48.1 F). The strongest colour marks a difference of 2.3 C (4.1 F).

Annual mean temperature at Lake Kachess as warming stripes, 1912 to 1976
Year	Annual mean temperature	Difference from the station mean
1912	6.8 C	-0.12 C
1913	6.4 C	-0.52 C
1914	7.3 C	+0.42 C
1915	7.7 C	+0.81 C
1916	5.5 C	-1.43 C
1918	7.2 C	+0.32 C
1919	5.7 C	-1.22 C
1920	6.4 C	-0.53 C
1921	6.3 C	-0.59 C
1923	6.9 C	-0.06 C
1924	6.5 C	-0.42 C
1925	7.9 C	+1.03 C
1926	7.8 C	+0.84 C
1928	7.0 C	+0.06 C
1929	6.3 C	-0.61 C
1930	6.4 C	-0.48 C
1931	7.0 C	+0.11 C
1932	6.6 C	-0.33 C
1933	6.5 C	-0.40 C
1934	9.0 C	+2.06 C
1935	6.7 C	-0.22 C
1936	7.4 C	+0.47 C
1937	6.7 C	-0.26 C
1938	7.9 C	+0.95 C
1939	8.1 C	+1.20 C
1940	8.3 C	+1.37 C
1941	8.2 C	+1.24 C
1942	7.3 C	+0.34 C
1943	6.4 C	-0.50 C
1944	6.7 C	-0.19 C
1945	7.1 C	+0.19 C
1946	7.0 C	+0.10 C
1947	7.6 C	+0.69 C
1948	5.7 C	-1.20 C
1949	6.1 C	-0.83 C
1950	5.5 C	-1.41 C
1951	6.7 C	-0.21 C
1952	6.7 C	-0.20 C
1953	7.3 C	+0.35 C
1954	5.8 C	-1.15 C
1955	4.7 C	-2.25 C
1957	6.5 C	-0.37 C
1958	8.4 C	+1.46 C
1959	6.6 C	-0.30 C
1960	6.6 C	-0.33 C
1961	7.4 C	+0.52 C
1962	7.1 C	+0.15 C
1963	7.3 C	+0.37 C
1964	6.0 C	-0.88 C
1965	7.5 C	+0.58 C
1966	7.4 C	+0.46 C
1967	8.1 C	+1.16 C
1968	6.9 C	+0.01 C
1969	6.6 C	-0.30 C
1973	7.0 C	+0.08 C
1974	6.8 C	-0.11 C
1976	6.8 C	-0.07 C

The fitted trend in annual mean temperature here over 1912 to 1976 is 0.01 C (-0.11 to 0.13) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.02 F (-0.20 to 0.24) per decade. The slope is a straight line fitted to 57 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Lake Kachess
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	0.01 C (-0.11 to 0.13) per decade	0.02 F (-0.20 to 0.24) per decade	1912 to 1976	57	Not clearly different from zero
Mean daily maximum	0.02 C (-0.12 to 0.17) per decade	0.04 F (-0.22 to 0.30) per decade	1912 to 1976	57	Not clearly different from zero
Mean daily minimum	0.0 C (-0.1 to 0.1) per decade	0.0 F (-0.2 to 0.2) per decade	1912 to 1976	57	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

1908 to 1977

Yearly extremes at Lake Kachess: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	40.0 C (104.0 F)	1939	35.6 C (96.1 F)	70
Coldest night (TNn)	-36.1 C (-33.0 F)	1950	-19.7 C (-3.5 F)	70
Wettest day (Rx1day)	132.3 mm (5.2 in)	1934	61.9 mm (2.4 in)	70
Wettest five days (Rx5day)	308.7 mm (12.2 in)	1933	133.4 mm (5.3 in)	70
Longest dry spell (CDD)	62 days	1925	30 days	70

Hottest day (TXx)

The hottest day of the year at Lake Kachess, 1908 to 1977. The record is 40.0 C (104.0 F) in 1939, marked on the chart; the median year is 35.6 C (96.1 F).

Hottest day (TXx) at Lake Kachess by year
Year	Hottest day (TXx)
1908	38.9 C (102.0 F)
1909	33.9 C (93.0 F)
1910	34.4 C (93.9 F)
1911	36.7 C (98.1 F)
1912	35.6 C (96.1 F)
1913	36.7 C (98.1 F)
1914	35.0 C (95.0 F)
1915	36.7 C (98.1 F)
1916	35.6 C (96.1 F)
1917	34.4 C (93.9 F)
1918	36.7 C (98.1 F)
1919	34.4 C (93.9 F)
1920	35.0 C (95.0 F)
1921	34.4 C (93.9 F)
1922	34.4 C (93.9 F)
1923	35.0 C (95.0 F)
1924	36.7 C (98.1 F)
1925	36.1 C (97.0 F)
1926	37.2 C (99.0 F)
1927	36.7 C (98.1 F)
1928	37.8 C (100.0 F)
1929	32.8 C (91.0 F)
1930	34.4 C (93.9 F)
1931	34.4 C (93.9 F)
1932	32.2 C (90.0 F)
1933	35.6 C (96.1 F)
1934	36.1 C (97.0 F)
1935	38.3 C (100.9 F)
1936	34.4 C (93.9 F)
1937	32.8 C (91.0 F)
1938	38.3 C (100.9 F)
1939	40.0 C (104.0 F)
1940	36.1 C (97.0 F)
1941	38.9 C (102.0 F)
1942	36.1 C (97.0 F)
1943	32.2 C (90.0 F)
1944	36.7 C (98.1 F)
1945	36.1 C (97.0 F)
1946	36.1 C (97.0 F)
1947	32.8 C (91.0 F)
1948	32.2 C (90.0 F)
1949	34.4 C (93.9 F)
1950	35.6 C (96.1 F)
1951	34.4 C (93.9 F)
1952	36.1 C (97.0 F)
1953	34.4 C (93.9 F)
1954	31.7 C (89.1 F)
1955	34.4 C (93.9 F)
1956	36.1 C (97.0 F)
1957	31.7 C (89.1 F)
1958	36.7 C (98.1 F)
1959	35.0 C (95.0 F)
1960	35.0 C (95.0 F)
1961	36.7 C (98.1 F)
1962	33.9 C (93.0 F)
1963	34.4 C (93.9 F)
1964	33.3 C (91.9 F)
1965	37.2 C (99.0 F)
1966	35.0 C (95.0 F)
1967	35.6 C (96.1 F)
1968	35.6 C (96.1 F)
1969	35.0 C (95.0 F)
1970	37.8 C (100.0 F)
1971	38.3 C (100.9 F)
1972	36.1 C (97.0 F)
1973	35.6 C (96.1 F)
1974	36.1 C (97.0 F)
1975	37.2 C (99.0 F)
1976	31.7 C (89.1 F)
1977	36.7 C (98.1 F)

Coldest night (TNn)

The coldest night of the year at Lake Kachess, 1908 to 1977. The record is -36.1 C (-33.0 F) in 1950, marked on the chart; the median year is -19.7 C (-3.5 F).

Coldest night (TNn) at Lake Kachess by year
Year	Coldest night (TNn)
1908	-11.7 C (10.9 F)
1909	-26.7 C (-16.1 F)
1910	-18.3 C (-0.9 F)
1911	-17.2 C (1.0 F)
1912	-18.9 C (-2.0 F)
1913	-19.4 C (-2.9 F)
1914	-19.4 C (-2.9 F)
1915	-20.0 C (-4.0 F)
1916	-22.2 C (-8.0 F)
1917	-17.2 C (1.0 F)
1918	-17.8 C (0.0 F)
1919	-26.7 C (-16.1 F)
1920	-15.6 C (3.9 F)
1921	-17.8 C (0.0 F)
1922	-22.2 C (-8.0 F)
1923	-23.3 C (-9.9 F)
1924	-23.3 C (-9.9 F)
1925	-11.7 C (10.9 F)
1926	-22.8 C (-9.0 F)
1927	-25.6 C (-14.1 F)
1928	-17.2 C (1.0 F)
1929	-25.6 C (-14.1 F)
1930	-23.9 C (-11.0 F)
1931	-17.2 C (1.0 F)
1932	-23.3 C (-9.9 F)
1933	-27.2 C (-17.0 F)
1934	-10.0 C (14.0 F)
1935	-22.2 C (-8.0 F)
1936	-24.4 C (-11.9 F)
1937	-25.6 C (-14.1 F)
1938	-12.2 C (10.0 F)
1939	-17.8 C (0.0 F)
1940	-14.4 C (6.1 F)
1941	-11.7 C (10.9 F)
1942	-21.1 C (-6.0 F)
1943	-27.2 C (-17.0 F)
1944	-17.8 C (0.0 F)
1945	-12.8 C (9.0 F)
1946	-14.4 C (6.1 F)
1947	-16.7 C (1.9 F)
1948	-21.1 C (-6.0 F)
1949	-30.0 C (-22.0 F)
1950	-36.1 C (-33.0 F)
1951	-23.9 C (-11.0 F)
1952	-22.2 C (-8.0 F)
1953	-10.0 C (14.0 F)
1954	-21.7 C (-7.1 F)
1955	-22.2 C (-8.0 F)
1956	-33.9 C (-29.0 F)
1957	-28.9 C (-20.0 F)
1958	-15.6 C (3.9 F)
1959	-21.1 C (-6.0 F)
1960	-16.7 C (1.9 F)
1961	-15.0 C (5.0 F)
1962	-25.0 C (-13.0 F)
1963	-22.8 C (-9.0 F)
1964	-26.7 C (-16.1 F)
1965	-13.3 C (8.1 F)
1966	-13.3 C (8.1 F)
1967	-15.6 C (3.9 F)
1968	-28.9 C (-20.0 F)
1969	-26.1 C (-15.0 F)
1970	-16.1 C (3.0 F)
1971	-17.8 C (0.0 F)
1972	-22.2 C (-8.0 F)
1973	-19.4 C (-2.9 F)
1974	-23.3 C (-9.9 F)
1975	-13.3 C (8.1 F)
1976	-16.1 C (3.0 F)
1977	-16.7 C (1.9 F)

Wettest day (Rx1day)

The wettest day of the year at Lake Kachess, 1908 to 1977. The record is 132.3 mm (5.2 in) in 1934, marked on the chart; the median year is 61.9 mm (2.4 in).

Wettest day (Rx1day) at Lake Kachess by year
Year	Wettest day (Rx1day)
1908	47.0 mm (1.9 in)
1909	61.5 mm (2.4 in)
1910	73.7 mm (2.9 in)
1911	61.0 mm (2.4 in)
1912	64.3 mm (2.5 in)
1913	50.8 mm (2.0 in)
1914	47.8 mm (1.9 in)
1915	83.8 mm (3.3 in)
1916	50.8 mm (2.0 in)
1917	98.0 mm (3.9 in)
1918	63.8 mm (2.5 in)
1919	68.8 mm (2.7 in)
1920	64.3 mm (2.5 in)
1921	55.9 mm (2.2 in)
1922	34.8 mm (1.4 in)
1923	112.8 mm (4.4 in)
1924	51.6 mm (2.0 in)
1925	41.9 mm (1.6 in)
1926	49.3 mm (1.9 in)
1927	62.0 mm (2.4 in)
1928	61.7 mm (2.4 in)
1929	43.4 mm (1.7 in)
1930	53.3 mm (2.1 in)
1931	47.5 mm (1.9 in)
1932	90.2 mm (3.6 in)
1933	116.1 mm (4.6 in)
1934	132.3 mm (5.2 in)
1935	65.5 mm (2.6 in)
1936	79.5 mm (3.1 in)
1937	50.5 mm (2.0 in)
1938	43.4 mm (1.7 in)
1939	51.6 mm (2.0 in)
1940	70.6 mm (2.8 in)
1941	72.1 mm (2.8 in)
1942	72.1 mm (2.8 in)
1943	93.0 mm (3.7 in)
1944	41.1 mm (1.6 in)
1945	81.5 mm (3.2 in)
1946	81.3 mm (3.2 in)
1947	47.0 mm (1.9 in)
1948	59.2 mm (2.3 in)
1949	66.3 mm (2.6 in)
1950	62.0 mm (2.4 in)
1951	72.4 mm (2.9 in)
1952	49.5 mm (1.9 in)
1953	88.6 mm (3.5 in)
1954	49.5 mm (1.9 in)
1955	68.1 mm (2.7 in)
1956	103.1 mm (4.1 in)
1957	41.7 mm (1.6 in)
1958	68.3 mm (2.7 in)
1959	113.0 mm (4.4 in)
1960	44.2 mm (1.7 in)
1961	91.2 mm (3.6 in)
1962	110.5 mm (4.4 in)
1963	89.2 mm (3.5 in)
1964	72.9 mm (2.9 in)
1965	78.0 mm (3.1 in)
1966	55.9 mm (2.2 in)
1967	57.9 mm (2.3 in)
1968	54.4 mm (2.1 in)
1969	49.5 mm (1.9 in)
1970	49.5 mm (1.9 in)
1971	50.8 mm (2.0 in)
1972	71.6 mm (2.8 in)
1973	45.7 mm (1.8 in)
1974	52.1 mm (2.1 in)
1975	79.5 mm (3.1 in)
1976	58.4 mm (2.3 in)
1977	44.7 mm (1.8 in)

Wettest five days (Rx5day)

The wettest five days of the year at Lake Kachess, 1908 to 1977. The record is 308.7 mm (12.2 in) in 1933, marked on the chart; the median year is 133.4 mm (5.3 in).

Wettest five days (Rx5day) at Lake Kachess by year
Year	Wettest five days (Rx5day)
1908	112.8 mm (4.4 in)
1909	167.6 mm (6.6 in)
1910	174.3 mm (6.9 in)
1911	186.5 mm (7.3 in)
1912	123.6 mm (4.9 in)
1913	131.4 mm (5.2 in)
1914	94.2 mm (3.7 in)
1915	127.4 mm (5.0 in)
1916	110.0 mm (4.3 in)
1917	212.5 mm (8.4 in)
1918	129.3 mm (5.1 in)
1919	153.3 mm (6.0 in)
1920	130.6 mm (5.1 in)
1921	167.4 mm (6.6 in)
1922	81.6 mm (3.2 in)
1923	242.1 mm (9.5 in)
1924	87.4 mm (3.4 in)
1925	87.8 mm (3.5 in)
1926	78.0 mm (3.1 in)
1927	128.6 mm (5.1 in)
1928	118.9 mm (4.7 in)
1929	82.8 mm (3.3 in)
1930	132.6 mm (5.2 in)
1931	96.5 mm (3.8 in)
1932	185.8 mm (7.3 in)
1933	308.7 mm (12.2 in)
1934	226.5 mm (8.9 in)
1935	207.0 mm (8.1 in)
1936	201.0 mm (7.9 in)
1937	172.5 mm (6.8 in)
1938	120.6 mm (4.7 in)
1939	139.2 mm (5.5 in)
1940	106.4 mm (4.2 in)
1941	113.8 mm (4.5 in)
1942	173.1 mm (6.8 in)
1943	147.1 mm (5.8 in)
1944	82.3 mm (3.2 in)
1945	127.5 mm (5.0 in)
1946	220.5 mm (8.7 in)
1947	148.9 mm (5.9 in)
1948	144.9 mm (5.7 in)
1949	195.5 mm (7.7 in)
1950	141.2 mm (5.6 in)
1951	168.5 mm (6.6 in)
1952	78.9 mm (3.1 in)
1953	182.9 mm (7.2 in)
1954	113.1 mm (4.5 in)
1955	145.3 mm (5.7 in)
1956	204.8 mm (8.1 in)
1957	100.0 mm (3.9 in)
1958	134.1 mm (5.3 in)
1959	214.6 mm (8.4 in)
1960	123.7 mm (4.9 in)
1961	130.3 mm (5.1 in)
1962	160.8 mm (6.3 in)
1963	120.9 mm (4.8 in)
1964	154.2 mm (6.1 in)
1965	260.8 mm (10.3 in)
1966	102.4 mm (4.0 in)
1967	147.6 mm (5.8 in)
1968	126.3 mm (5.0 in)
1969	45.7 mm (1.8 in)
1970	110.0 mm (4.3 in)
1971	178.1 mm (7.0 in)
1972	176.1 mm (6.9 in)
1973	87.6 mm (3.4 in)
1974	124.5 mm (4.9 in)
1975	199.0 mm (7.8 in)
1976	148.4 mm (5.8 in)
1977	77.4 mm (3.0 in)

Longest dry spell (CDD)

The longest dry spell of the year at Lake Kachess, 1908 to 1977. The record is 62 days in 1925, marked on the chart; the median year is 30 days.

Longest dry spell (CDD) at Lake Kachess by year
Year	Longest dry spell (CDD)
1908	27 days
1909	45 days
1910	30 days
1911	27 days
1912	22 days
1913	51 days
1914	54 days
1915	33 days
1916	30 days
1917	31 days
1918	41 days
1919	31 days
1920	25 days
1921	26 days
1922	48 days
1923	19 days
1924	25 days
1925	62 days
1926	17 days
1927	32 days
1928	52 days
1929	36 days
1930	22 days
1931	48 days
1932	29 days
1933	24 days
1934	35 days
1935	18 days
1936	43 days
1937	23 days
1938	29 days
1939	36 days
1940	42 days
1941	21 days
1942	41 days
1943	24 days
1944	23 days
1945	31 days
1946	27 days
1947	32 days
1948	13 days
1949	28 days
1950	31 days
1951	51 days
1952	41 days
1953	25 days
1954	24 days
1955	46 days
1956	23 days
1957	30 days
1958	42 days
1959	20 days
1960	25 days
1961	39 days
1962	17 days
1963	26 days
1964	20 days
1965	38 days
1966	16 days
1967	42 days
1968	24 days
1969	28 days
1970	32 days
1971	43 days
1972	33 days
1973	27 days
1974	31 days
1975	30 days
1976	29 days
1977	26 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

57 years with a frost

Across 57 years with a frost, the median last spring frost at Lake Kachess falls on 24 May and the median first autumn frost on 22 September, which leaves a median of 121 days between them.

Fitted over all years, the growing season changes by -0.7 days per decade at this station.

Frost dates and growing season at Lake Kachess
Measure	Median, all years	Earliest period	Recent period (1942 to 1976)	Recent against earliest	Fitted trend
Last spring frost	24 May	n/a	24 May	n/a	-0.2 days per decade
First autumn frost	22 September	n/a	21 September	n/a	-0.9 days per decade
Growing days	121 days	n/a	121 days	n/a	-0.7 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

65 years, 1909 to 1976

A day with at least 62.4 mm (2.5 in) of rain is expected about once in 2 years. A day with at least 144.6 mm (5.7 in) of rain is expected about once in 100 years.

Rainfall return levels at Lake Kachess: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	62.4 mm (2.5 in)
5 years	81.6 mm (3.2 in)
10 years	95.3 mm (3.8 in)
25 years	114.0 mm (4.5 in)
50 years	128.9 mm (5.1 in)
100 years	144.6 mm (5.7 in)	Longer than the 65 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, 65 years of values from 1909 to 1976.

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: 132.3 mm (5.2 in) in 1934; 116.1 mm (4.6 in) in 1933; 113.0 mm (4.4 in) in 1959.

Station Changes

No change in the annual mean temperature of this station was found against its neighbours.

Download the Data

Data for Lake Kachess standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Lake Kachess 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).