San Antonio Cn Mouth Threshold Days by Year (USC00047711)

17 fixed thresholds counted per year at San Antonio Cn Mouth (USC00047711): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for San Antonio Cn Mouth Thresholds

San Antonio Cn Mouth: days with 10 mm (0.39 in) or more of precipitation in 37 years, most in 1930 with 26.
San Antonio Cn Mouth: days with 25 mm (0.98 in) or more of precipitation in 37 years, most in 1965 with 14.
San Antonio Cn Mouth: days with a maximum temperature at or above 30 C (86 F) in 33 years, most in 1939 with 149.
San Antonio Cn Mouth: days with a maximum temperature at or above 35 C (95 F) in 33 years, most in 1936 with 83.
17 fixed thresholds have at least one qualifying day at San Antonio Cn Mouth.

Days at or above 30 C (86 F)

33 years with a qualifying day

Days per year at San Antonio Cn Mouth with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 149 in 1939.

Days at or above 30 C (86 F) per year at San Antonio Cn Mouth
Year	Days	Decade average
1933	144	136.2
1934	135	136.2
1935	117	136.2
1936	139	136.2
1937	133	136.2
1939	149	136.2
1940	144	98.8
1941	120	98.8
1942	92	98.8
1943	99	98.8
1944	70	98.8
1945	94	98.8
1946	87	98.8
1947	92	98.8
1948	97	98.8
1949	93	98.8
1950	89	88.1
1951	91	88.1
1952	89	88.1
1953	91	88.1
1954	74	88.1
1955	78	88.1
1956	89	88.1
1957	86	88.1
1958	97	88.1
1959	97	88.1
1960	117	100.3
1961	101	100.3
1962	100	100.3
1963	73	100.3
1964	102	100.3
1965	95	100.3
1966	114	100.3

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

First to last qualifying date each year at San Antonio Cn Mouth
Year	First date	Last date
1933	1933-04-01	1933-11-25
1934	1934-03-08	1934-11-08
1935	1935-02-19	1935-10-26
1936	1936-03-11	1936-11-18
1937	1937-04-14	1937-10-28
1939	1939-03-15	1939-12-20
1940	1940-04-10	1940-12-08
1941	1941-04-23	1941-11-15
1942	1942-05-19	1942-10-22
1943	1943-04-30	1943-10-16
1944	1944-05-04	1944-09-27
1945	1945-04-19	1945-12-31
1946	1946-04-11	1946-10-24
1947	1947-04-14	1947-10-19
1948	1948-04-16	1948-10-23
1949	1949-04-10	1949-11-22
1950	1950-04-16	1950-11-05
1951	1951-05-10	1951-10-19
1952	1952-05-23	1952-11-05
1953	1953-06-11	1953-10-09
1954	1954-04-16	1954-10-20
1955	1955-05-28	1955-10-30
1956	1956-03-29	1956-11-10
1957	1957-06-01	1957-10-26
1958	1958-04-19	1958-12-03
1959	1959-04-01	1959-10-24
1960	1960-04-04	1960-10-22
1961	1961-04-03	1961-10-17
1962	1962-01-07	1962-11-01
1963	1963-06-15	1963-10-02
1964	1964-04-13	1964-10-22
1965	1965-04-28	1965-11-01
1966	1966-03-30	1966-11-03

Every Fixed Threshold

Fixed thresholds at San Antonio Cn Mouth
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	33	149	1939	114
35 C (95 F): Days	33	83	1936	23
40 C (104 F): Days	18	18	1936	3
45 C (113 F): Days	3	3	1933	1
90 F (32.2 C): Days	33	120	1933	73
100 F (37.8 C): Days	32	50	1936	3
110 F (43.3 C): Days	4	6	1933	1
0 C (32 F): Ice days (max	1	1	1933	1
0 C (32 F): Frost days (min	29	34	1937	3
20 C (68 F): Tropical nights (min	33	31	1960	13
25 C (77 F): Days with min	16	3	1933	1
10 mm (0.39 in): Days with 10 mm or more rain	37	26	1930	10
25 mm (0.98 in): Days with 25 mm or more rain	37	14	1965	7
50 mm (1.97 in): Days with 50 mm or more rain	32	8	1958	4
100 mm (3.94 in): Days with 100 mm or more rain	14	2	1944	2
200 mm (7.87 in): Days with 200 mm or more rain	2	1	1956	1
10 cm (3.9 in): Days with 10 cm or more snowfall	1	2	1949	2

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1933.

Download the Data

Data for San Antonio Cn Mouth 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 2025-12-31. Last revised 31 December 2025 (2025-12-31).

San Antonio Cn Mouth Threshold Days by Year (USC00047711)

Key Facts for San Antonio Cn Mouth Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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