Sand Mt Substn Threshold Days by Year (USC00017207)

16 fixed thresholds counted per year at Sand Mt Substn (USC00017207): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Sand Mt Substn Thresholds

Sand Mt Substn: days with 10 mm (0.39 in) or more of precipitation in 75 years, most in 1989 with 60.
Sand Mt Substn: days with 25 mm (0.98 in) or more of precipitation in 75 years, most in 2013 with 33.
Sand Mt Substn: days with a maximum temperature at or above 30 C (86 F) in 74 years, most in 1954 with 121.
Sand Mt Substn: days with a maximum temperature at or above 90 F (32.2 C) in 74 years, most in 1954 with 99.
16 fixed thresholds have at least one qualifying day at Sand Mt Substn.

Days at or above 30 C (86 F)

74 years with a qualifying day

Days per year at Sand Mt Substn with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 121 in 1954.

Days at or above 30 C (86 F) per year at Sand Mt Substn
Year	Days	Decade average
1950	32	90.6
1951	92	90.6
1952	94	90.6
1953	110	90.6
1954	121	90.6
1955	96	90.6
1956	89	90.6
1957	94	90.6
1958	86	90.6
1959	92	90.6
1960	91	65.3
1961	38	65.3
1962	101	65.3
1963	69	65.3
1964	78	65.3
1965	60	65.3
1966	52	65.3
1967	25	65.3
1968	64	65.3
1969	75	65.3
1970	89	62.2
1971	63	62.2
1972	66	62.2
1973	62	62.2
1974	51	62.2
1975	51	62.2
1976	25	62.2
1977	90	62.2
1978	88	62.2
1979	37	62.2
1980	81	72.2
1981	70	72.2
1982	71	72.2
1983	66	72.2
1984	72	72.2
1985	66	72.2
1986	99	72.2
1987	70	72.2
1988	80	72.2
1989	47	72.2
1990	75	64.2
1991	65	64.2
1992	21	64.2
1993	80	64.2
1994	32	64.2
1995	74	64.2
1996	57	64.2
1997	56	64.2
1998	110	64.2
1999	72	64.2
2000	70	66
2001	52	66
2002	86	66
2003	47	66
2004	42	66
2006	91	66
2007	87	66
2008	69	66
2009	50	66
2010	105	80
2011	95	80
2012	73	80
2013	37	80
2014	63	80
2015	65	80
2016	109	80
2017	55	80
2018	92	80
2019	106	80
2020	67	66
2021	42	66
2022	73	66
2025	66	66
2026	82	66

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

First to last qualifying date each year at Sand Mt Substn
Year	First date	Last date
1950	1950-05-25	1950-09-04
1951	1951-05-01	1951-10-07
1952	1952-05-01	1952-10-01
1953	1953-05-22	1953-10-21
1954	1954-05-30	1954-10-14
1955	1955-04-17	1955-10-06
1956	1956-05-12	1956-09-29
1957	1957-04-27	1957-09-22
1958	1958-05-16	1958-09-26
1959	1959-05-01	1959-10-05
1960	1960-04-24	1960-09-21
1961	1961-06-01	1961-08-30
1962	1962-05-08	1962-09-15
1963	1963-05-08	1963-10-21
1964	1964-04-07	1964-09-23
1965	1965-04-24	1965-09-22
1966	1966-06-08	1966-09-04
1967	1967-05-26	1967-09-19
1968	1968-06-04	1968-09-04
1969	1969-05-22	1969-09-18
1970	1970-04-30	1970-09-26
1971	1971-06-02	1971-10-02
1972	1972-06-04	1972-09-20
1973	1973-06-03	1973-09-25
1974	1974-05-18	1974-09-12
1975	1975-05-23	1975-09-11
1976	1976-06-13	1976-08-27
1977	1977-05-17	1977-09-10
1978	1978-05-21	1978-09-23
1979	1979-06-03	1979-09-06
1980	1980-07-02	1980-09-25
1981	1981-05-31	1981-10-06
1982	1982-05-14	1982-10-06
1983	1983-06-25	1983-09-19
1984	1984-05-27	1984-09-26
1985	1985-05-15	1985-09-12
1986	1986-04-27	1986-10-05
1987	1987-05-21	1987-09-27
1988	1988-05-16	1988-09-24
1989	1989-04-29	1989-09-15
1990	1990-06-07	1990-09-22
1991	1991-05-18	1991-09-19
1992	1992-06-17	1992-09-09
1993	1993-06-08	1993-09-26
1994	1994-06-03	1994-09-18
1995	1995-04-11	1995-09-12
1996	1996-05-19	1996-09-09
1997	1997-06-14	1997-09-21
1998	1998-05-14	1998-10-06
1999	1999-04-04	1999-09-16
2000	2000-05-19	2000-08-31
2001	2001-04-11	2001-09-07
2002	2002-04-19	2002-10-07
2003	2003-06-11	2003-09-21
2004	2004-05-10	2004-08-30
2006	2006-04-18	2006-10-06
2007	2007-05-11	2007-10-09
2008	2008-05-31	2008-09-14
2009	2009-04-25	2009-09-26
2010	2010-05-07	2010-10-12
2011	2011-05-10	2011-09-15
2012	2012-05-02	2012-09-08
2013	2013-05-22	2013-09-13
2014	2014-05-14	2014-10-03
2015	2015-05-09	2015-09-10
2016	2016-05-26	2016-10-19
2017	2017-04-30	2017-09-28
2018	2018-05-12	2018-10-07
2019	2019-05-22	2019-10-06
2020	2020-06-03	2020-09-15
2021	2021-05-24	2021-09-15
2022	2022-05-19	2022-09-23
2025	2025-05-16	2025-09-23
2026	2026-04-18	2026-10-14

Every Fixed Threshold

Fixed thresholds at Sand Mt Substn
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	74	121	1954	82
35 C (95 F): Days	44	46	1954	4
40 C (104 F): Days	1	2	1952	2
90 F (32.2 C): Days	74	99	1954	35
100 F (37.8 C): Days	9	9	1952	4
0 C (32 F): Ice days (max	69	16	1978	4
0 C (32 F): Frost days (min	72	94	1981	39
-10 C (14 F): Days with min	62	21	1985	2
-20 C (-4 F): Days with min	5	2	1958	2
20 C (68 F): Tropical nights (min	72	76	1952	76
25 C (77 F): Days with min	2	1	1952	1
10 mm (0.39 in): Days with 10 mm or more rain	75	60	1989	31
25 mm (0.98 in): Days with 25 mm or more rain	75	33	2013	14
50 mm (1.97 in): Days with 50 mm or more rain	73	10	2009	1
100 mm (3.94 in): Days with 100 mm or more rain	20	3	1979	1
10 cm (3.9 in): Days with 10 cm or more snowfall	8	1	1954	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1950.

Download the Data

Data for Sand Mt Substn 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).

Sand Mt Substn Threshold Days by Year (USC00017207)

Key Facts for Sand Mt Substn Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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