San Carlos Rsvr Threshold Days by Year (USC00027480)

15 fixed thresholds counted per year at San Carlos Rsvr (USC00027480): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for San Carlos Rsvr Thresholds

San Carlos Rsvr: days with 10 mm (0.39 in) or more of precipitation in 94 years, most in 1993 with 23.
San Carlos Rsvr: days with 25 mm (0.98 in) or more of precipitation in 83 years, most in 1978 with 8.
San Carlos Rsvr: days with a maximum temperature at or above 30 C (86 F) in 68 years, most in 1910 with 194.
San Carlos Rsvr: days with a maximum temperature at or above 35 C (95 F) in 68 years, most in 1910 with 136.
15 fixed thresholds have at least one qualifying day at San Carlos Rsvr.

Days at or above 30 C (86 F)

68 years with a qualifying day

Days per year at San Carlos Rsvr with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 194 in 1910.

Days at or above 30 C (86 F) per year at San Carlos Rsvr
Year	Days	Decade average
1904	184	164
1905	148	164
1906	168	164
1907	153	164
1909	167	164
1910	194	194
1944	140	157.5
1945	160	157.5
1946	159	157.5
1947	160	157.5
1948	170	157.5
1949	156	157.5
1950	173	159.7
1951	143	159.7
1952	176	159.7
1953	150	159.7
1954	171	159.7
1955	153	159.7
1956	172	159.7
1957	137	159.7
1958	151	159.7
1959	171	159.7
1960	163	152.9
1961	156	152.9
1962	151	152.9
1963	164	152.9
1964	147	152.9
1965	158	152.9
1966	148	152.9
1967	150	152.9
1968	142	152.9
1969	150	152.9
1970	137	150.2
1971	145	150.2
1972	164	150.2
1973	154	150.2
1974	158	150.2
1975	125	150.2
1976	154	150.2
1977	153	150.2
1978	162	150.2
1979	150	150.2
1980	151	155.6
1981	162	155.6
1982	148	155.6
1983	134	155.6
1984	153	155.6
1985	146	155.6
1986	146	155.6
1987	162	155.6
1988	172	155.6
1989	182	155.6
1990	162	161.9
1991	160	161.9
1992	159	161.9
1993	162	161.9
1994	155	161.9
1995	160	161.9
1997	175	161.9
2002	178	178
2010	150	140.7
2014	134	140.7
2015	100	140.7
2016	151	140.7
2017	142	140.7
2018	167	140.7
2025	159	153
2026	147	153

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

First to last qualifying date each year at San Carlos Rsvr
Year	First date	Last date
1904	1904-02-23	1904-10-22
1905	1905-04-30	1905-10-15
1906	1906-04-10	1906-11-15
1907	1907-03-17	1907-10-14
1909	1909-04-14	1909-11-06
1910	1910-03-02	1910-11-11
1944	1944-05-06	1944-10-22
1945	1945-04-19	1945-10-31
1946	1946-04-05	1946-10-23
1947	1947-04-16	1947-10-22
1948	1948-04-15	1948-10-17
1949	1949-04-16	1949-10-15
1950	1950-03-31	1950-11-03
1951	1951-04-24	1951-10-21
1952	1952-04-06	1952-10-29
1953	1953-03-27	1953-10-19
1954	1954-04-10	1954-10-23
1955	1955-04-29	1955-10-22
1956	1956-03-25	1956-10-22
1957	1957-02-15	1957-10-11
1958	1958-04-20	1958-10-20
1959	1959-04-02	1959-10-28
1960	1960-03-22	1960-10-29
1961	1961-04-04	1961-10-22
1962	1962-04-13	1962-10-25
1963	1963-04-09	1963-10-28
1964	1964-03-31	1964-10-16
1965	1965-04-01	1965-10-30
1966	1966-04-02	1966-11-01
1967	1967-03-16	1967-10-27
1968	1968-05-04	1968-10-29
1969	1969-04-21	1969-10-18
1970	1970-05-05	1970-10-02
1971	1971-03-27	1971-10-15
1972	1972-03-06	1972-10-17
1973	1973-04-27	1973-10-25
1974	1974-03-18	1974-10-19
1975	1975-05-04	1975-10-21
1976	1976-04-03	1976-10-19
1977	1977-04-08	1977-10-27
1978	1978-04-25	1978-10-20
1979	1979-04-18	1979-10-27
1980	1980-04-17	1980-10-13
1981	1981-04-11	1981-10-30
1982	1982-04-13	1982-10-24
1983	1983-04-25	1983-10-12
1984	1984-04-14	1984-10-14
1985	1985-04-08	1985-10-28
1986	1986-02-27	1986-10-20
1987	1987-04-16	1987-10-29
1988	1988-03-25	1988-11-01
1989	1989-03-10	1989-10-17
1990	1990-03-23	1990-10-28
1991	1991-04-07	1991-10-21
1992	1992-04-13	1992-10-20
1993	1993-04-22	1993-10-26
1994	1994-04-16	1994-10-14
1995	1995-04-14	1995-10-28
1997	1997-03-21	1997-11-02
2002	2002-03-22	2002-10-17
2010	2010-04-16	2010-10-31
2014	2014-04-09	2014-10-26
2015	2015-03-29	2015-10-14
2016	2016-03-22	2016-10-31
2017	2017-05-06	2017-10-27
2018	2018-04-02	2018-10-02
2025	2025-03-25	2025-11-08
2026	2026-02-28	2026-09-21

Every Fixed Threshold

Fixed thresholds at San Carlos Rsvr
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	68	194	1910	147
35 C (95 F): Days	68	136	1910	108
40 C (104 F): Days	68	60	1910	44
45 C (113 F): Days	15	5	1994	1
90 F (32.2 C): Days	68	170	1910	126
100 F (37.8 C): Days	68	96	1910	77
110 F (43.3 C): Days	38	9	1994	12
0 C (32 F): Frost days (min	66	89	1904	4
-10 C (14 F): Days with min	5	3	1904	1
20 C (68 F): Tropical nights (min	66	103	1958	90
25 C (77 F): Days with min	65	29	1981	46
10 mm (0.39 in): Days with 10 mm or more rain	94	23	1993	4
25 mm (0.98 in): Days with 25 mm or more rain	83	8	1978	2
50 mm (1.97 in): Days with 50 mm or more rain	17	3	1907	1
10 cm (3.9 in): Days with 10 cm or more snowfall	1	1	1985	1

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

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Data for San Carlos Rsvr 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 2026-10-17. Last revised 17 October 2026 (2026-10-17).

San Carlos Rsvr Threshold Days by Year (USC00027480)

Key Facts for San Carlos Rsvr Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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