Blackwell 1SSW Threshold Days by Year (USC00340818)

19 fixed thresholds counted per year at Blackwell 1SSW (USC00340818): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Blackwell 1SSW Thresholds

Blackwell 1SSW: days with 10 mm (0.39 in) or more of precipitation in 68 years, most in 2007 with 44.
Blackwell 1SSW: days with 25 mm (0.98 in) or more of precipitation in 68 years, most in 1999 with 20.
Blackwell 1SSW: days with 50 mm (1.97 in) or more of precipitation in 61 years, most in 1997 with 11.
Blackwell 1SSW: days with a maximum temperature at or above 30 C (86 F) in 58 years, most in 1956 with 148.
19 fixed thresholds have at least one qualifying day at Blackwell 1SSW.

Days at or above 30 C (86 F)

58 years with a qualifying day

Days per year at Blackwell 1SSW with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 148 in 1956.

Days at or above 30 C (86 F) per year at Blackwell 1SSW
Year	Days	Decade average
1955	120	120.8
1956	148	120.8
1958	108	120.8
1959	107	120.8
1960	106	106.3
1961	85	106.3
1962	131	106.3
1963	130	106.3
1964	104	106.3
1965	115	106.3
1966	103	106.3
1967	89	106.3
1968	94	106.3
1971	104	102.3
1974	93	102.3
1975	95	102.3
1976	97	102.3
1977	111	102.3
1978	116	102.3
1979	100	102.3
1980	120	104.2
1981	107	104.2
1982	104	104.2
1983	96	104.2
1984	108	104.2
1985	89	104.2
1986	101	104.2
1987	111	104.2
1988	115	104.2
1989	91	104.2
1990	104	95.1
1991	106	95.1
1992	69	95.1
1993	86	95.1
1994	105	95.1
1995	99	95.1
1996	107	95.1
1997	75	95.1
1998	121	95.1
1999	79	95.1
2000	108	92.8
2001	86	92.8
2003	83	92.8
2004	90	92.8
2005	105	92.8
2006	116	92.8
2007	88	92.8
2008	80	92.8
2009	79	92.8
2010	111	111.3
2011	119	111.3
2012	126	111.3
2013	101	111.3
2014	110	111.3
2015	103	111.3
2016	116	111.3
2017	98	111.3
2018	118	111.3

For each year, a bar from the first to the last day at Blackwell 1SSW meeting 30 C (86 F).

First to last qualifying date each year at Blackwell 1SSW
Year	First date	Last date
1955	1955-03-10	1955-10-20
1956	1956-03-05	1956-10-12
1958	1958-04-23	1958-10-20
1959	1959-03-24	1959-10-16
1960	1960-04-06	1960-10-11
1961	1961-04-19	1961-10-12
1962	1962-02-12	1962-10-15
1963	1963-03-28	1963-10-18
1964	1964-04-12	1964-09-19
1965	1965-04-20	1965-10-10
1966	1966-03-31	1966-10-13
1967	1967-03-10	1967-10-06
1968	1968-04-30	1968-10-30
1971	1971-04-12	1971-10-12
1974	1974-03-31	1974-09-12
1975	1975-05-08	1975-10-21
1976	1976-03-25	1976-10-11
1977	1977-05-08	1977-10-21
1978	1978-05-11	1978-10-21
1979	1979-05-27	1979-10-21
1980	1980-04-21	1980-11-08
1981	1981-04-12	1981-10-05
1982	1982-04-12	1982-10-07
1983	1983-05-27	1983-10-02
1984	1984-06-01	1984-10-03
1985	1985-06-02	1985-09-19
1986	1986-04-24	1986-09-28
1987	1987-04-17	1987-09-26
1988	1988-05-12	1988-10-17
1989	1989-04-22	1989-10-14
1990	1990-05-14	1990-10-06
1991	1991-03-05	1991-10-23
1992	1992-05-15	1992-10-13
1993	1993-06-06	1993-10-06
1994	1994-04-21	1994-10-06
1995	1995-03-22	1995-10-22
1996	1996-02-22	1996-10-16
1997	1997-05-17	1997-10-07
1998	1998-04-26	1998-09-30
1999	1999-04-21	1999-10-16
2000	2000-04-19	2000-10-05
2001	2001-04-27	2001-10-05
2003	2003-05-05	2003-10-24
2004	2004-04-17	2004-09-28
2005	2005-05-11	2005-10-18
2006	2006-03-13	2006-11-08
2007	2007-05-13	2007-10-08
2008	2008-05-02	2008-09-29
2009	2009-03-06	2009-09-28
2010	2010-04-01	2010-10-18
2011	2011-03-18	2011-10-05
2012	2012-04-02	2012-11-03
2013	2013-04-30	2013-10-12
2014	2014-04-13	2014-10-27
2015	2015-04-01	2015-10-16
2016	2016-04-06	2016-11-17
2017	2017-03-21	2017-10-15
2018	2018-04-13	2018-10-06

Every Fixed Threshold

Fixed thresholds at Blackwell 1SSW
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	58	148	1956	118
35 C (95 F): Days	58	100	1956	22
40 C (104 F): Days	45	44	1956	2
45 C (113 F): Days	4	3	1956	1
90 F (32.2 C): Days	58	127	1956	80
100 F (37.8 C): Days	56	70	1956	1
110 F (43.3 C): Days	10	9	1956	4
0 C (32 F): Ice days (max	58	38	1978	16
0 C (32 F): Frost days (min	57	126	2013	122
-10 C (14 F): Days with min	57	31	2014	21
-20 C (-4 F): Days with min	16	4	1983	2
20 C (68 F): Tropical nights (min	57	91	1980	69
25 C (77 F): Days with min	47	27	2011	4
10 mm (0.39 in): Days with 10 mm or more rain	68	44	2007	28
25 mm (0.98 in): Days with 25 mm or more rain	68	20	1999	12
50 mm (1.97 in): Days with 50 mm or more rain	61	11	1997	2
100 mm (3.94 in): Days with 100 mm or more rain	13	2	1961	1
10 cm (3.9 in): Days with 10 cm or more snowfall	16	4	1988	1
25 cm (9.8 in): Days with 25 cm or more snowfall	1	1	2003	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1955.

Download the Data

Data for Blackwell 1SSW 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).

Blackwell 1SSW Threshold Days by Year (USC00340818)

Key Facts for Blackwell 1SSW Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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