Clear Lake Dam Weather Records (USC00041805)

Record envelope, standing records and threshold days for Clear Lake Dam (USC00041805), California, United States, with 48 years of record.

Key Facts for Clear Lake Dam

Clear Lake Dam (USC00041805) is a weather station in California, United States at 41.93 latitude and -121.07 longitude, 1,394 m (4,573 ft) above sea level.
The station reports from 1907 to 1954, 48 years of record.
1,464 records set at Clear Lake Dam still stand.
Records are tracked for prcp: an element needs 30 years of data to be eligible.
Clear Lake Dam set a daily record precipitation of 1.0 mm (0.04 in) on 15 August 1954.

About the Station

Location: California, United States, 41.93 latitude, -121.07 longitude.
Elevation: 1,394 m (4,573 ft).
Period of record: 1907 to 1954, 48 years.
Eligible elements: prcp.

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 Clear Lake Dam. 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 Clear Lake Dam, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	13.9 C (57.0 F)	-35.0 C (-31.0 F)	n/a	n/a
Feb	17.2 C (63.0 F)	-31.7 C (-25.1 F)	n/a	n/a
Mar	26.1 C (79.0 F)	-19.4 C (-2.9 F)	n/a	n/a
Apr	26.1 C (79.0 F)	-9.4 C (15.1 F)	n/a	n/a
May	36.1 C (97.0 F)	-6.1 C (21.0 F)	n/a	n/a
Jun	37.2 C (99.0 F)	-2.2 C (28.0 F)	n/a	n/a
Jul	36.7 C (98.1 F)	1.7 C (35.1 F)	n/a	n/a
Aug	35.0 C (95.0 F)	-0.6 C (30.9 F)	n/a	n/a
Sep	36.7 C (98.1 F)	-6.7 C (19.9 F)	n/a	n/a
Oct	29.4 C (84.9 F)	-12.2 C (10.0 F)	n/a	n/a
Nov	25.0 C (77.0 F)	-16.7 C (1.9 F)	n/a	n/a
Dec	14.4 C (57.9 F)	-23.3 C (-9.9 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Clear Lake Dam still stand. 1949 holds the most, with 177.

Wettest Day of Each Month

Nov: 63.5 mm (2.5 in)

The wettest day on record for each calendar month at Clear Lake Dam. The most was 63.5 mm (2.5 in) on 22 November 1908.

Record daily precipitation for each month at Clear Lake Dam
Month	Record daily precipitation (mm)	Date
Jan	25.4 mm (1.0 in)	14 January 1909
Feb	32.0 mm (1.3 in)	13 February 1945
Mar	21.8 mm (0.9 in)	3 March 1947
Apr	24.9 mm (1.0 in)	7 April 1935
May	39.9 mm (1.6 in)	6 May 1927
Jun	36.6 mm (1.4 in)	23 June 1912
Jul	24.9 mm (1.0 in)	6 July 1923
Aug	20.3 mm (0.8 in)	17 August 1941
Sep	23.9 mm (0.9 in)	30 September 1930
Oct	52.3 mm (2.1 in)	30 October 1933
Nov	63.5 mm (2.5 in)	22 November 1908
Dec	41.9 mm (1.6 in)	10 December 1937

Period of Record Coverage

1909 to 1954

13 years of record at Clear Lake Dam, 1909 to 1954. 9 years have data for under 90 percent of days and are left out of rankings: 1909, 1910, 1912, 1913, 1914, 1948, 1950, 1953 and others.

Days with data per year at Clear Lake Dam
Year	Days with data	Share of year	Complete
1909	4	1%	No
1910	309	85%	No
1911	341	93%	Yes
1912	329	90%	No
1913	323	88%	No
1914	118	32%	No
1948	244	67%	No
1949	364	100%	Yes
1950	276	76%	No
1951	365	100%	Yes
1952	366	100%	Yes
1953	283	78%	No
1954	153	42%	No

Latest Records

Latest records at Clear Lake Dam
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
15 August 1954	Clear Lake Dam, US	daily rain	1.0 mm (0.04 in)	1.0 mm (0.04 in)	44 years	19 of 100 (Routine)
8 June 1954	Clear Lake Dam, US	daily rain	22.1 mm (0.9 in)	13.5 mm (0.5 in)	17 years	20 of 100 (Routine)
18 October 1953	Clear Lake Dam, US	daily rain	24.1 mm (0.9 in)	13.9 mm (0.5 in)	7 years	20 of 100 (Routine)
10 October 1953	Clear Lake Dam, US	daily rain	14.0 mm (0.6 in)	3.3 mm (0.13 in)	6 years	9 of 100 (Routine)
4 August 1953	Clear Lake Dam, US	daily rain	4.3 mm (0.17 in)	4.3 mm (0.17 in)	44 years	20 of 100 (Routine)
19 May 1953	Clear Lake Dam, US	daily rain	31.5 mm (1.2 in)	20.8 mm (0.8 in)	4 years	41 of 100 (Notable)
14 May 1953	Clear Lake Dam, US	daily rain	21.3 mm (0.8 in)	9.4 mm (0.37 in)	8 years	20 of 100 (Routine)
27 April 1953	Clear Lake Dam, US	daily rain	18.8 mm (0.7 in)	4.3 mm (0.17 in)	11 years	17 of 100 (Routine)
28 March 1953	Clear Lake Dam, US	daily rain (Tie)	7.1 mm (0.28 in)	tie	19 years	2 of 100 (Routine)
19 March 1953	Clear Lake Dam, US	daily rain	18.3 mm (0.7 in)	3.6 mm (0.14 in)	20 years	19 of 100 (Routine)
5 February 1953	Clear Lake Dam, US	daily rain	14.0 mm (0.6 in)	1.8 mm (0.07 in)	19 years	13 of 100 (Routine)
20 January 1953	Clear Lake Dam, US	daily rain	10.2 mm (0.4 in)	5.6 mm (0.22 in)	19 years	20 of 100 (Routine)
17 January 1953	Clear Lake Dam, US	daily rain	10.9 mm (0.4 in)	4.8 mm (0.19 in)	3 years	16 of 100 (Routine)
19 December 1952	Clear Lake Dam, US	daily rain	5.1 mm (0.20 in)	0.8 mm (0.03 in)	45 years	18 of 100 (Routine)
11 September 1952	Clear Lake Dam, US	daily rain	6.6 mm (0.26 in)	2.0 mm (0.08 in)	22 years	14 of 100 (Routine)
9 September 1952	Clear Lake Dam, US	daily rain	22.6 mm (0.9 in)	17.3 mm (0.7 in)	10 years	20 of 100 (Routine)
2 August 1952	Clear Lake Dam, US	daily rain	4.6 mm (0.18 in)	3.1 mm (0.12 in)	40 years	20 of 100 (Routine)
31 July 1952	Clear Lake Dam, US	daily rain	3.0 mm (0.12 in)	2.7 mm (0.11 in)	15 years	13 of 100 (Routine)
29 July 1952	Clear Lake Dam, US	daily rain	6.1 mm (0.24 in)	4.6 mm (0.18 in)	8 years	15 of 100 (Routine)
13 July 1952	Clear Lake Dam, US	daily rain	0.8 mm (0.03 in)	0.3 mm (0.01 in)	41 years	16 of 100 (Routine)

Extremes by Year

1907 to 1954

Yearly extremes at Clear Lake Dam: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	37.2 C (99.0 F)	1951	35.0 C (95.0 F)	13
Coldest night (TNn)	-35.0 C (-31.0 F)	1949	-23.9 C (-11.0 F)	13
Wettest day (Rx1day)	63.5 mm (2.5 in)	1908	24.9 mm (1.0 in)	40
Wettest five days (Rx5day)	72.9 mm (2.9 in)	1937	44.6 mm (1.8 in)	40
Longest dry spell (CDD)	110 days	1929	50 days	40

Hottest day (TXx)

The hottest day of the year at Clear Lake Dam, 1907 to 1954. The record is 37.2 C (99.0 F) in 1951, marked on the chart; the median year is 35.0 C (95.0 F).

Hottest day (TXx) at Clear Lake Dam by year
Year	Hottest day (TXx)
1907	n/a
1908	n/a
1909	7.8 C (46.0 F)
1910	36.7 C (98.1 F)
1911	36.1 C (97.0 F)
1912	36.7 C (98.1 F)
1913	36.7 C (98.1 F)
1914	26.1 C (79.0 F)
1923	n/a
1924	n/a
1925	n/a
1926	n/a
1927	n/a
1928	n/a
1929	n/a
1930	n/a
1931	n/a
1932	n/a
1933	n/a
1934	n/a
1935	n/a
1936	n/a
1937	n/a
1938	n/a
1939	n/a
1940	n/a
1941	n/a
1942	n/a
1943	n/a
1944	n/a
1945	n/a
1946	n/a
1947	n/a
1948	33.9 C (93.0 F)
1949	35.0 C (95.0 F)
1950	36.7 C (98.1 F)
1951	37.2 C (99.0 F)
1952	33.9 C (93.0 F)
1953	33.9 C (93.0 F)
1954	35.0 C (95.0 F)

Coldest night (TNn)

The coldest night of the year at Clear Lake Dam, 1907 to 1954. The record is -35.0 C (-31.0 F) in 1949, marked on the chart; the median year is -23.9 C (-11.0 F).

Coldest night (TNn) at Clear Lake Dam by year
Year	Coldest night (TNn)
1907	n/a
1908	n/a
1909	-16.7 C (1.9 F)
1910	-28.9 C (-20.0 F)
1911	-26.7 C (-16.1 F)
1912	-26.7 C (-16.1 F)
1913	-26.1 C (-15.0 F)
1914	-15.0 C (5.0 F)
1923	n/a
1924	n/a
1925	n/a
1926	n/a
1927	n/a
1928	n/a
1929	n/a
1930	n/a
1931	n/a
1932	n/a
1933	n/a
1934	n/a
1935	n/a
1936	n/a
1937	n/a
1938	n/a
1939	n/a
1940	n/a
1941	n/a
1942	n/a
1943	n/a
1944	n/a
1945	n/a
1946	n/a
1947	n/a
1948	-16.7 C (1.9 F)
1949	-35.0 C (-31.0 F)
1950	-29.4 C (-20.9 F)
1951	-20.0 C (-4.0 F)
1952	-23.9 C (-11.0 F)
1953	-13.3 C (8.1 F)
1954	-6.1 C (21.0 F)

Wettest day (Rx1day)

The wettest day of the year at Clear Lake Dam, 1907 to 1954. The record is 63.5 mm (2.5 in) in 1908, marked on the chart; the median year is 24.9 mm (1.0 in).

Wettest day (Rx1day) at Clear Lake Dam by year
Year	Wettest day (Rx1day)
1907	25.9 mm (1.0 in)
1908	63.5 mm (2.5 in)
1909	25.4 mm (1.0 in)
1910	18.3 mm (0.7 in)
1911	10.2 mm (0.4 in)
1912	36.6 mm (1.4 in)
1913	25.4 mm (1.0 in)
1914	20.3 mm (0.8 in)
1923	24.9 mm (1.0 in)
1924	15.2 mm (0.6 in)
1925	34.5 mm (1.4 in)
1926	17.8 mm (0.7 in)
1927	39.9 mm (1.6 in)
1928	27.9 mm (1.1 in)
1929	16.0 mm (0.6 in)
1930	23.9 mm (0.9 in)
1931	20.3 mm (0.8 in)
1932	14.7 mm (0.6 in)
1933	52.3 mm (2.1 in)
1934	27.9 mm (1.1 in)
1935	24.9 mm (1.0 in)
1936	15.7 mm (0.6 in)
1937	41.9 mm (1.6 in)
1938	18.3 mm (0.7 in)
1939	39.4 mm (1.6 in)
1940	21.3 mm (0.8 in)
1941	23.9 mm (0.9 in)
1942	16.3 mm (0.6 in)
1943	29.0 mm (1.1 in)
1944	29.2 mm (1.1 in)
1945	32.0 mm (1.3 in)
1946	21.8 mm (0.9 in)
1947	21.8 mm (0.9 in)
1948	20.8 mm (0.8 in)
1949	27.7 mm (1.1 in)
1950	26.7 mm (1.1 in)
1951	26.4 mm (1.0 in)
1952	24.1 mm (0.9 in)
1953	31.5 mm (1.2 in)
1954	22.1 mm (0.9 in)

Wettest five days (Rx5day)

The wettest five days of the year at Clear Lake Dam, 1907 to 1954. The record is 72.9 mm (2.9 in) in 1937, marked on the chart; the median year is 44.6 mm (1.8 in).

Wettest five days (Rx5day) at Clear Lake Dam by year
Year	Wettest five days (Rx5day)
1907	28.7 mm (1.1 in)
1908	63.5 mm (2.5 in)
1909	51.4 mm (2.0 in)
1910	46.2 mm (1.8 in)
1911	30.0 mm (1.2 in)
1912	47.0 mm (1.9 in)
1913	41.7 mm (1.6 in)
1914	62.5 mm (2.5 in)
1923	38.0 mm (1.5 in)
1924	24.3 mm (1.0 in)
1925	52.5 mm (2.1 in)
1926	51.1 mm (2.0 in)
1927	46.2 mm (1.8 in)
1928	41.9 mm (1.6 in)
1929	38.9 mm (1.5 in)
1930	27.2 mm (1.1 in)
1931	33.5 mm (1.3 in)
1932	43.1 mm (1.7 in)
1933	58.6 mm (2.3 in)
1934	30.2 mm (1.2 in)
1935	55.6 mm (2.2 in)
1936	28.4 mm (1.1 in)
1937	72.9 mm (2.9 in)
1938	37.6 mm (1.5 in)
1939	71.6 mm (2.8 in)
1940	53.7 mm (2.1 in)
1941	48.0 mm (1.9 in)
1942	40.4 mm (1.6 in)
1943	63.7 mm (2.5 in)
1944	56.4 mm (2.2 in)
1945	46.9 mm (1.8 in)
1946	41.1 mm (1.6 in)
1947	38.5 mm (1.5 in)
1948	46.0 mm (1.8 in)
1949	42.2 mm (1.7 in)
1950	50.5 mm (2.0 in)
1951	33.1 mm (1.3 in)
1952	39.5 mm (1.6 in)
1953	47.8 mm (1.9 in)
1954	41.9 mm (1.6 in)

Longest dry spell (CDD)

The longest dry spell of the year at Clear Lake Dam, 1907 to 1954. The record is 110 days in 1929, marked on the chart; the median year is 50 days.

Longest dry spell (CDD) at Clear Lake Dam by year
Year	Longest dry spell (CDD)
1907	14 days
1908	22 days
1909	104 days
1910	27 days
1911	20 days
1912	24 days
1913	28 days
1914	24 days
1923	38 days
1924	60 days
1925	32 days
1926	44 days
1927	45 days
1928	27 days
1929	110 days
1930	31 days
1931	81 days
1932	41 days
1933	70 days
1934	61 days
1935	51 days
1936	64 days
1937	82 days
1938	42 days
1939	42 days
1940	54 days
1941	24 days
1942	60 days
1943	102 days
1944	53 days
1945	85 days
1946	51 days
1947	41 days
1948	52 days
1949	42 days
1950	75 days
1951	98 days
1952	61 days
1953	51 days
1954	49 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.

Download the Data

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

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