Shamrock #2 Threshold Days by Year (USC00418236)

19 fixed thresholds counted per year at Shamrock #2 (USC00418236): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Shamrock #2 Thresholds

Shamrock #2: days with a maximum temperature at or above 30 C (86 F) in 51 years, most in 1972 with 136.
Shamrock #2: days with a maximum temperature at or above 35 C (95 F) in 51 years, most in 2011 with 100.
Shamrock #2: days with a maximum temperature at or above 90 F (32.2 C) in 51 years, most in 2011 with 122.
Shamrock #2: days with a maximum temperature at or below 0 C (32 F) in 51 years, most in 1978 with 26.
19 fixed thresholds have at least one qualifying day at Shamrock #2.

Days at or above 30 C (86 F)

51 years with a qualifying day

Days per year at Shamrock #2 with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 136 in 1972.

Days at or above 30 C (86 F) per year at Shamrock #2
Year	Days	Decade average
1966	113	108
1967	115	108
1968	101	108
1969	103	108
1970	121	111.8
1971	133	111.8
1972	136	111.8
1973	115	111.8
1974	98	111.8
1975	109	111.8
1976	100	111.8
1977	116	111.8
1978	86	111.8
1979	104	111.8
1980	128	103.4
1981	119	103.4
1982	91	103.4
1983	102	103.4
1984	111	103.4
1985	90	103.4
1987	96	103.4
1988	96	103.4
1989	98	103.4
1990	107	98.7
1991	99	98.7
1992	80	98.7
1993	101	98.7
1994	108	98.7
1995	83	98.7
1996	87	98.7
1997	89	98.7
1998	134	98.7
1999	99	98.7
2000	111	104.2
2001	105	104.2
2002	107	104.2
2003	104	104.2
2004	91	104.2
2005	119	104.2
2006	113	104.2
2007	95	104.2
2008	101	104.2
2009	96	104.2
2010	117	115.5
2011	136	115.5
2012	120	115.5
2013	107	115.5
2014	113	115.5
2015	107	115.5
2016	119	115.5
2017	105	115.5

For each year, a bar from the first to the last day at Shamrock #2 meeting 30 C (86 F).

First to last qualifying date each year at Shamrock #2
Year	First date	Last date
1966	1966-03-20	1966-10-28
1967	1967-03-11	1967-10-23
1968	1968-04-13	1968-10-30
1969	1969-04-07	1969-10-10
1970	1970-02-17	1970-10-06
1971	1971-03-13	1971-10-11
1972	1972-02-25	1972-10-17
1973	1973-04-29	1973-11-01
1974	1974-04-27	1974-09-28
1975	1975-03-21	1975-10-28
1976	1976-02-10	1976-10-12
1977	1977-05-07	1977-10-27
1978	1978-03-19	1978-10-21
1979	1979-02-15	1979-10-22
1980	1980-04-21	1980-11-09
1981	1981-02-21	1981-10-15
1982	1982-04-13	1982-11-01
1983	1983-05-05	1983-10-03
1984	1984-04-26	1984-09-25
1985	1985-04-16	1985-10-08
1987	1987-04-17	1987-10-09
1988	1988-04-05	1988-10-18
1989	1989-03-11	1989-10-23
1990	1990-05-09	1990-11-02
1991	1991-03-06	1991-10-23
1992	1992-04-29	1992-10-14
1993	1993-04-19	1993-10-07
1994	1994-03-18	1994-10-04
1995	1995-03-20	1995-10-23
1996	1996-02-23	1996-10-17
1997	1997-03-18	1997-10-03
1998	1998-03-26	1998-10-15
1999	1999-04-21	1999-10-16
2000	2000-04-06	2000-10-04
2001	2001-04-09	2001-10-24
2002	2002-03-14	2002-09-30
2003	2003-04-02	2003-10-30
2004	2004-03-20	2004-09-20
2005	2005-04-05	2005-11-09
2006	2006-04-06	2006-10-04
2007	2007-05-05	2007-10-21
2008	2008-04-17	2008-09-08
2009	2009-03-05	2009-11-08
2010	2010-03-31	2010-10-31
2011	2011-03-12	2011-10-26
2012	2012-03-29	2012-11-03
2013	2013-03-16	2013-10-05
2014	2014-04-03	2014-11-30
2015	2015-03-29	2015-10-16
2016	2016-02-19	2016-11-16
2017	2017-02-11	2017-11-25

Every Fixed Threshold

Fixed thresholds at Shamrock #2
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	51	136	1972	105
35 C (95 F): Days	51	100	2011	39
40 C (104 F): Days	37	44	2011	1
45 C (113 F): Days	2	2	2011	2
90 F (32.2 C): Days	51	122	2011	72
100 F (37.8 C): Days	49	76	2011	7
110 F (43.3 C): Days	3	4	2011	4
0 C (32 F): Ice days (max	51	26	1978	7
0 C (32 F): Frost days (min	46	125	2013	84
-10 C (14 F): Days with min	46	31	1978	6
-20 C (-4 F): Days with min	4	3	1966	1
20 C (68 F): Tropical nights (min	46	88	2011	39
25 C (77 F): Days with min	7	27	2011	3
10 mm (0.39 in): Days with 10 mm or more rain	51	29	2000	22
25 mm (0.98 in): Days with 25 mm or more rain	51	15	2017	15
50 mm (1.97 in): Days with 50 mm or more rain	32	5	1991	2
100 mm (3.94 in): Days with 100 mm or more rain	6	1	1990	1
200 mm (7.87 in): Days with 200 mm or more rain	1	1	1995	1
10 cm (3.9 in): Days with 10 cm or more snowfall	19	4	1997	2

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1966.

Download the Data

Data for Shamrock #2 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).

Shamrock #2 Threshold Days by Year (USC00418236)

Key Facts for Shamrock #2 Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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