Grapevine Dam Threshold Days by Year (USC00413691)

17 fixed thresholds counted per year at Grapevine Dam (USC00413691): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Grapevine Dam Thresholds

Grapevine Dam: days with 10 mm (0.39 in) or more of precipitation in 88 years, most in 2015 with 49.
Grapevine Dam: days with 25 mm (0.98 in) or more of precipitation in 88 years, most in 2015 with 22.
Grapevine Dam: days with 50 mm (1.97 in) or more of precipitation in 84 years, most in 2015 with 9.
Grapevine Dam: days with a maximum temperature at or above 30 C (86 F) in 67 years, most in 1963 with 168.
17 fixed thresholds have at least one qualifying day at Grapevine Dam.

Days at or above 30 C (86 F)

67 years with a qualifying day

Days per year at Grapevine Dam with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 168 in 1963.

Days at or above 30 C (86 F) per year at Grapevine Dam
Year	Days	Decade average
1902	121	121
1903	108	121
1907	129	121
1908	126	121
1912	131	116.4
1914	112	116.4
1915	80	116.4
1916	144	116.4
1917	115	116.4
1954	138	137
1955	163	137
1956	161	137
1957	113	137
1958	120	137
1959	127	137
1960	140	126.3
1961	112	126.3
1962	136	126.3
1963	168	126.3
1964	116	126.3
1965	121	126.3
1966	113	126.3
1967	125	126.3
1968	110	126.3
1969	122	126.3
1970	117	121.3
1971	116	121.3
1972	141	121.3
1973	116	121.3
1974	101	121.3
1975	122	121.3
1976	104	121.3
1977	141	121.3
1978	138	121.3
1979	117	121.3
1980	134	124.4
1982	122	124.4
1983	114	124.4
1984	130	124.4
1985	115	124.4
1986	124	124.4
1987	129	124.4
1988	128	124.4
1989	124	124.4
1990	122	127.7
1991	127	127.7
1992	108	127.7
1993	126	127.7
1994	121	127.7
1995	120	127.7
1996	141	127.7
1997	120	127.7
1998	151	127.7
1999	141	127.7
2001	121	124.2
2002	139	124.2
2004	110	124.2
2005	140	124.2
2009	111	124.2
2012	137	128.6
2013	121	128.6
2014	130	128.6
2015	122	128.6
2016	121	128.6
2017	132	128.6
2018	133	128.6
2019	133	128.6

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

First to last qualifying date each year at Grapevine Dam
Year	First date	Last date
1902	1902-03-03	1902-10-26
1903	1903-04-01	1903-11-13
1907	1907-03-07	1907-10-11
1908	1908-03-01	1908-11-07
1912	1912-03-18	1912-10-10
1914	1914-03-25	1914-11-05
1915	1915-05-12	1915-11-08
1916	1916-03-06	1916-11-01
1917	1917-02-26	1917-10-29
1954	1954-02-27	1954-10-19
1955	1955-03-11	1955-12-25
1956	1956-02-25	1956-10-13
1957	1957-05-15	1957-10-07
1958	1958-04-05	1958-10-10
1959	1959-02-18	1959-10-26
1960	1960-02-10	1960-11-16
1961	1961-04-20	1961-09-30
1962	1962-05-06	1962-10-16
1963	1963-03-25	1963-11-08
1964	1964-04-03	1964-10-18
1965	1965-04-11	1965-11-27
1966	1966-04-01	1966-10-15
1967	1967-03-04	1967-10-07
1968	1968-05-15	1968-10-30
1969	1969-01-09	1969-10-21
1970	1970-05-11	1970-10-08
1971	1971-03-14	1971-10-03
1972	1972-03-08	1972-10-19
1973	1973-05-02	1973-10-11
1974	1974-03-19	1974-09-20
1975	1975-04-26	1975-11-10
1976	1976-03-03	1976-10-12
1977	1977-05-09	1977-11-01
1978	1978-04-05	1978-10-21
1979	1979-04-26	1979-10-22
1980	1980-02-21	1980-11-09
1982	1982-02-24	1982-10-19
1983	1983-03-02	1983-10-06
1984	1984-04-21	1984-10-20
1985	1985-04-27	1985-10-25
1986	1986-02-20	1986-11-18
1987	1987-04-12	1987-11-05
1988	1988-04-06	1988-11-08
1989	1989-03-12	1989-11-15
1990	1990-04-30	1990-10-17
1991	1991-03-06	1991-10-25
1992	1992-05-06	1992-10-27
1993	1993-03-09	1993-10-17
1994	1994-03-20	1994-10-07
1995	1995-03-23	1995-11-02
1996	1996-02-15	1996-10-19
1997	1997-02-02	1997-10-11
1998	1998-04-14	1998-10-30
1999	1999-04-20	1999-11-15
2001	2001-04-05	2001-11-04
2002	2002-03-15	2002-10-07
2004	2004-05-01	2004-10-30
2005	2005-03-13	2005-12-04
2009	2009-02-27	2009-10-09
2012	2012-04-26	2012-11-03
2013	2013-03-05	2013-10-14
2014	2014-04-24	2014-10-27
2015	2015-04-26	2015-10-16
2016	2016-03-15	2016-11-02
2017	2017-02-12	2017-11-06
2018	2018-04-14	2018-10-08
2019	2019-04-10	2019-10-21

Every Fixed Threshold

Fixed thresholds at Grapevine Dam
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	67	168	1963	133
35 C (95 F): Days	67	109	1998	62
40 C (104 F): Days	39	27	1998	6
90 F (32.2 C): Days	67	137	1956	106
100 F (37.8 C): Days	63	68	1998	12
110 F (43.3 C): Days	4	1	1912	1
0 C (32 F): Ice days (max	55	15	1978	1
0 C (32 F): Frost days (min	63	76	1964	34
-10 C (14 F): Days with min	40	13	1963	2
20 C (68 F): Tropical nights (min	63	131	1998	123
25 C (77 F): Days with min	57	46	1998	39
10 mm (0.39 in): Days with 10 mm or more rain	88	49	2015	15
25 mm (0.98 in): Days with 25 mm or more rain	88	22	2015	8
50 mm (1.97 in): Days with 50 mm or more rain	84	9	2015	1
100 mm (3.94 in): Days with 100 mm or more rain	23	3	2015	1
200 mm (7.87 in): Days with 200 mm or more rain	2	1	1964	1
10 cm (3.9 in): Days with 10 cm or more snowfall	7	1	1903	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1902.

Download the Data

Data for Grapevine 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 2026-10-17 (17 October 2026). Threshold counts are computed by this site.

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

Grapevine Dam Threshold Days by Year (USC00413691)

Key Facts for Grapevine Dam Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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