Ralston Threshold Days by Year (USC00347390)

21 fixed thresholds counted per year at Ralston (USC00347390): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Ralston Thresholds

Ralston: days with 10 mm (0.39 in) or more of precipitation in 92 years, most in 1957 with 44.
Ralston: days with 25 mm (0.98 in) or more of precipitation in 92 years, most in 2007 with 19.
Ralston: days with 50 mm (1.97 in) or more of precipitation in 85 years, most in 1927 with 8.
Ralston: days with a maximum temperature at or above 30 C (86 F) in 59 years, most in 1963 with 137.
21 fixed thresholds have at least one qualifying day at Ralston.

Days at or above 30 C (86 F)

59 years with a qualifying day

Days per year at Ralston with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 137 in 1963.

Days at or above 30 C (86 F) per year at Ralston
Year	Days	Decade average
1960	104	105.4
1961	82	105.4
1962	121	105.4
1963	137	105.4
1964	103	105.4
1965	109	105.4
1966	106	105.4
1967	89	105.4
1968	96	105.4
1969	107	105.4
1970	112	106.6
1971	109	106.6
1972	119	106.6
1973	97	106.6
1974	85	106.6
1975	105	106.6
1976	94	106.6
1977	116	106.6
1978	117	106.6
1979	112	106.6
1980	129	111.1
1981	112	111.1
1982	106	111.1
1983	95	111.1
1984	113	111.1
1985	100	111.1
1986	102	111.1
1987	121	111.1
1988	120	111.1
1989	113	111.1
1990	116	104.9
1991	129	104.9
1992	83	104.9
1993	87	104.9
1994	107	104.9
1995	94	104.9
1996	109	104.9
1997	94	104.9
1998	125	104.9
2000	106	98.2
2002	99	98.2
2003	94	98.2
2004	83	98.2
2005	111	98.2
2006	125	98.2
2007	88	98.2
2008	91	98.2
2009	87	98.2
2010	121	113.3
2011	130	113.3
2012	137	113.3
2015	101	113.3
2016	105	113.3
2017	92	113.3
2018	115	113.3
2019	105	113.3
2020	101	118
2023	119	118
2026	134	118

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

First to last qualifying date each year at Ralston
Year	First date	Last date
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	1963-10-19
1964	1964-04-12	1964-10-17
1965	1965-04-21	1965-10-10
1966	1966-03-31	1966-10-28
1967	1967-03-10	1967-10-06
1968	1968-05-01	1968-10-30
1969	1969-05-20	1969-10-04
1970	1970-04-27	1970-10-02
1971	1971-04-12	1971-10-12
1972	1972-04-06	1972-10-12
1973	1973-05-10	1973-10-08
1974	1974-03-31	1974-09-09
1975	1975-04-17	1975-10-13
1976	1976-04-02	1976-10-13
1977	1977-04-07	1977-10-27
1978	1978-05-11	1978-10-21
1979	1979-03-29	1979-10-21
1980	1980-04-20	1980-11-06
1981	1981-02-20	1981-10-05
1982	1982-04-12	1982-10-08
1983	1983-05-27	1983-10-03
1984	1984-05-10	1984-10-06
1985	1985-04-18	1985-09-20
1986	1986-04-07	1986-09-28
1987	1987-04-17	1987-09-26
1988	1988-03-21	1988-10-17
1989	1989-03-11	1989-11-11
1990	1990-04-21	1990-10-16
1991	1991-03-05	1991-10-24
1992	1992-04-13	1992-10-14
1993	1993-05-30	1993-10-07
1994	1994-03-20	1994-10-06
1995	1995-03-22	1995-10-15
1996	1996-02-22	1996-09-24
1997	1997-03-21	1997-10-05
1998	1998-04-25	1998-09-30
2000	2000-04-05	2000-10-04
2002	2002-04-17	2002-10-03
2003	2003-04-13	2003-10-24
2004	2004-05-06	2004-10-21
2005	2005-05-10	2005-11-07
2006	2006-03-01	2006-11-08
2007	2007-04-02	2007-10-06
2008	2008-04-21	2008-10-01
2009	2009-03-05	2009-09-27
2010	2010-03-31	2010-10-21
2011	2011-03-17	2011-10-25
2012	2012-03-13	2012-11-03
2015	2015-04-01	2015-10-16
2016	2016-04-11	2016-11-17
2017	2017-02-12	2017-10-03
2018	2018-04-13	2018-10-06
2019	2019-04-10	2019-10-03
2020	2020-03-27	2020-10-23
2023	2023-04-04	2023-11-08
2026	2026-03-10	2026-10-15

Every Fixed Threshold

Fixed thresholds at Ralston
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	59	137	1963	134
35 C (95 F): Days	59	84	1980	66
40 C (104 F): Days	32	43	2011	10
45 C (113 F): Days	2	5	2012	5
90 F (32.2 C): Days	59	109	2012	109
100 F (37.8 C): Days	53	62	2011	38
110 F (43.3 C): Days	7	10	2011	10
0 C (32 F): Ice days (max	58	30	1978	4
0 C (32 F): Frost days (min	59	115	2008	47
-10 C (14 F): Days with min	59	32	1963	10
-20 C (-4 F): Days with min	17	4	1979	1
-30 C (-22 F): Days with min	1	1	2011	1
20 C (68 F): Tropical nights (min	59	90	2011	112
25 C (77 F): Days with min	51	21	2011	27
10 mm (0.39 in): Days with 10 mm or more rain	92	44	1957	27
25 mm (0.98 in): Days with 25 mm or more rain	92	19	2007	11
50 mm (1.97 in): Days with 50 mm or more rain	85	8	1927	4
100 mm (3.94 in): Days with 100 mm or more rain	17	4	2019	1
200 mm (7.87 in): Days with 200 mm or more rain	1	1	2019	1
10 cm (3.9 in): Days with 10 cm or more snowfall	30	4	1987	1
25 cm (9.8 in): Days with 25 cm or more snowfall	5	1	1966	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1960.

Download the Data

Data for Ralston 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).

Ralston Threshold Days by Year (USC00347390)

Key Facts for Ralston Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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