Clear Lake Threshold Days by Year (USC00391777)

18 fixed thresholds counted per year at Clear Lake (USC00391777): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Clear Lake Thresholds

Clear Lake: days with 10 mm (0.39 in) or more of precipitation in 78 years, most in 1946 with 30.
Clear Lake: days with 25 mm (0.98 in) or more of precipitation in 76 years, most in 1977 with 12.
Clear Lake: days with 10 cm (3.9 in) or more of snowfall in 67 years, most in 1969 with 12.
Clear Lake: days with a maximum temperature at or above 30 C (86 F) in 62 years, most in 1959 with 67.
18 fixed thresholds have at least one qualifying day at Clear Lake.

Days at or above 30 C (86 F)

62 years with a qualifying day

Days per year at Clear Lake with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 67 in 1959.

Days at or above 30 C (86 F) per year at Clear Lake
Year	Days	Decade average
1904	11	15.5
1906	20	15.5
1956	27	42
1957	34	42
1958	40	42
1959	67	42
1960	35	32.2
1961	43	32.2
1963	32	32.2
1964	45	32.2
1965	15	32.2
1966	37	32.2
1967	30	32.2
1968	29	32.2
1969	24	32.2
1970	47	34.6
1971	25	34.6
1972	29	34.6
1973	42	34.6
1974	43	34.6
1975	42	34.6
1977	26	34.6
1978	30	34.6
1979	27	34.6
1980	43	31.4
1981	22	31.4
1982	21	31.4
1983	51	31.4
1984	22	31.4
1985	19	31.4
1986	15	31.4
1987	40	31.4
1988	52	31.4
1989	29	31.4
1990	24	13.7
1991	26	13.7
1992	7	13.7
1993	7	13.7
1994	4	13.7
1995	21	13.7
1996	7	13.7
1997	14	13.7
1998	13	13.7
2000	16	21.6
2001	31	21.6
2002	34	21.6
2003	27	21.6
2004	11	21.6
2005	26	21.6
2006	25	21.6
2007	25	21.6
2008	10	21.6
2009	11	21.6
2010	25	18.7
2011	24	18.7
2012	35	18.7
2013	21	18.7
2014	3	18.7
2015	11	18.7
2016	17	18.7
2018	23	18.7
2019	9	18.7

For each year, a bar from the first to the last day at Clear Lake meeting 30 C (86 F).

First to last qualifying date each year at Clear Lake
Year	First date	Last date
1904	1904-05-28	1904-09-09
1906	1906-05-11	1906-09-10
1956	1956-05-21	1956-09-27
1957	1957-06-20	1957-08-31
1958	1958-05-10	1958-10-15
1959	1959-05-01	1959-09-14
1960	1960-06-26	1960-09-06
1961	1961-05-31	1961-09-10
1963	1963-05-07	1963-10-05
1964	1964-04-16	1964-09-02
1965	1965-06-19	1965-08-14
1966	1966-05-26	1966-08-31
1967	1967-05-25	1967-09-25
1968	1968-04-30	1968-08-23
1969	1969-05-27	1969-09-15
1970	1970-05-18	1970-10-05
1971	1971-06-16	1971-09-07
1972	1972-05-16	1972-09-19
1973	1973-06-09	1973-09-01
1974	1974-06-03	1974-09-27
1975	1975-05-20	1975-09-02
1977	1977-04-09	1977-09-09
1978	1978-06-30	1978-09-12
1979	1979-05-28	1979-09-10
1980	1980-04-20	1980-10-09
1981	1981-06-23	1981-09-12
1982	1982-06-28	1982-09-10
1983	1983-06-10	1983-09-27
1984	1984-07-08	1984-09-20
1985	1985-04-18	1985-08-08
1986	1986-06-18	1986-07-24
1987	1987-04-19	1987-08-16
1988	1988-05-28	1988-09-17
1989	1989-06-06	1989-08-05
1990	1990-04-23	1990-09-13
1991	1991-04-06	1991-09-07
1992	1992-04-30	1992-10-02
1993	1993-07-30	1993-10-06
1994	1994-06-14	1994-08-24
1995	1995-06-14	1995-08-24
1996	1996-06-11	1996-08-13
1997	1997-06-24	1997-10-02
1998	1998-05-18	1998-09-18
2000	2000-05-05	2000-10-01
2001	2001-05-15	2001-09-06
2002	2002-05-30	2002-09-18
2003	2003-04-15	2003-09-08
2004	2004-04-29	2004-09-20
2005	2005-06-07	2005-09-12
2006	2006-05-24	2006-08-24
2007	2007-05-14	2007-09-24
2008	2008-07-02	2008-09-27
2009	2009-04-24	2009-08-26
2010	2010-05-25	2010-08-31
2011	2011-06-07	2011-09-29
2012	2012-05-18	2012-09-12
2013	2013-05-14	2013-09-19
2014	2014-05-31	2014-07-31
2015	2015-06-10	2015-09-04
2016	2016-05-07	2016-08-11
2018	2018-05-25	2018-09-17
2019	2019-06-05	2019-07-27

Every Fixed Threshold

Fixed thresholds at Clear Lake
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	62	67	1959	9
35 C (95 F): Days	42	18	1988	1
40 C (104 F): Days	1	2	1966	2
90 F (32.2 C): Days	59	41	1959	1
100 F (37.8 C): Days	3	5	1988	5
0 C (32 F): Ice days (max	62	110	2013	106
0 C (32 F): Frost days (min	61	199	2002	177
-10 C (14 F): Days with min	61	107	2014	89
-20 C (-4 F): Days with min	61	49	2014	41
-30 C (-22 F): Days with min	42	9	1977	5
20 C (68 F): Tropical nights (min	60	20	1983	4
25 C (77 F): Days with min	4	2	1988	2
10 mm (0.39 in): Days with 10 mm or more rain	78	30	1946	9
25 mm (0.98 in): Days with 25 mm or more rain	76	12	1977	4
50 mm (1.97 in): Days with 50 mm or more rain	44	4	2004	2
100 mm (3.94 in): Days with 100 mm or more rain	3	2	1992	1
10 cm (3.9 in): Days with 10 cm or more snowfall	67	12	1969	2
25 cm (9.8 in): Days with 25 cm or more snowfall	22	3	1985	2

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1904.

Download the Data

Data for Clear Lake 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). Threshold counts are computed by this site.

Data as of 2026-10-12. Last revised 12 October 2026 (2026-10-12).

Clear Lake Threshold Days by Year (USC00391777)

Key Facts for Clear Lake Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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