Riddle Threshold Days by Year (USC00357169)

15 fixed thresholds counted per year at Riddle (USC00357169): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Riddle Thresholds

Riddle: days with 10 mm (0.39 in) or more of precipitation in 108 years, most in 1996 with 46.
Riddle: days with a maximum temperature at or above 30 C (86 F) in 106 years, most in 2015 with 103.
Riddle: days with a maximum temperature at or above 90 F (32.2 C) in 106 years, most in 2014 with 65.
Riddle: days with 25 mm (0.98 in) or more of precipitation in 106 years, most in 2012 with 11.
15 fixed thresholds have at least one qualifying day at Riddle.

Days at or above 30 C (86 F)

106 years with a qualifying day

Days per year at Riddle with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 103 in 2015.

Days at or above 30 C (86 F) per year at Riddle
Year	Days	Decade average
1913	36	40.4
1914	43	40.4
1915	35	40.4
1916	26	40.4
1917	47	40.4
1918	52	40.4
1919	44	40.4
1920	48	48.6
1921	40	48.6
1922	59	48.6
1923	46	48.6
1924	44	48.6
1925	51	48.6
1926	57	48.6
1928	42	48.6
1929	50	48.6
1930	34	55.9
1932	49	55.9
1933	47	55.9
1934	61	55.9
1935	67	55.9
1936	37	55.9
1938	78	55.9
1939	74	55.9
1940	84	48.3
1941	45	48.3
1943	45	48.3
1947	39	48.3
1948	30	48.3
1949	47	48.3
1950	65	41.9
1951	74	41.9
1952	59	41.9
1953	27	41.9
1954	8	41.9
1955	22	41.9
1956	40	41.9
1957	21	41.9
1958	60	41.9
1959	43	41.9
1960	43	38.3
1961	49	38.3
1962	29	38.3
1963	26	38.3
1964	25	38.3
1965	34	38.3
1966	41	38.3
1967	71	38.3
1968	41	38.3
1969	24	38.3
1970	53	41.8
1971	37	41.8
1972	41	41.8
1973	45	41.8
1974	46	41.8
1975	37	41.8
1976	26	41.8
1977	51	41.8
1978	40	41.8
1980	36	43.6
1981	44	43.6
1982	40	43.6
1983	23	43.6
1984	47	43.6
1985	55	43.6
1986	55	43.6
1987	58	43.6
1988	53	43.6
1989	25	43.6
1990	46	47.5
1991	53	47.5
1992	57	47.5
1993	31	47.5
1994	50	47.5
1995	45	47.5
1996	51	47.5
1997	42	47.5
1998	49	47.5
1999	51	47.5
2000	44	55.5
2001	60	55.5
2002	56	55.5
2003	64	55.5
2004	57	55.5
2005	51	55.5
2006	61	55.5
2007	46	55.5
2008	63	55.5
2009	53	55.5
2010	48	71.8
2011	55	71.8
2012	63	71.8
2013	76	71.8
2014	84	71.8
2015	103	71.8
2016	70	71.8
2017	79	71.8
2018	74	71.8
2019	66	71.8
2020	75	80
2021	83	80
2022	82	80
2023	84	80
2024	73	80
2025	91	80
2026	72	80

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

First to last qualifying date each year at Riddle
Year	First date	Last date
1913	1913-05-06	1913-09-27
1914	1914-05-21	1914-09-24
1915	1915-06-05	1915-09-20
1916	1916-06-12	1916-09-28
1917	1917-06-12	1917-10-07
1918	1918-06-04	1918-10-01
1919	1919-05-21	1919-09-25
1920	1920-05-06	1920-09-13
1921	1921-06-05	1921-10-08
1922	1922-05-16	1922-09-25
1923	1923-03-28	1923-10-01
1924	1924-05-30	1924-09-28
1925	1925-06-19	1925-09-23
1926	1926-04-14	1926-09-04
1928	1928-05-19	1928-09-22
1929	1929-05-11	1929-10-13
1930	1930-06-06	1930-09-19
1932	1932-06-09	1932-10-04
1933	1933-06-11	1933-10-06
1934	1934-04-19	1934-10-10
1935	1935-05-05	1935-10-01
1936	1936-05-09	1936-10-09
1938	1938-05-22	1938-09-22
1939	1939-04-17	1939-09-26
1940	1940-04-12	1940-10-19
1941	1941-05-21	1941-09-25
1943	1943-05-24	1943-10-08
1947	1947-04-13	1947-10-03
1948	1948-05-23	1948-09-13
1949	1949-04-14	1949-09-22
1950	1950-05-25	1950-09-24
1951	1951-04-11	1951-09-27
1952	1952-05-27	1952-10-07
1953	1953-05-04	1953-09-14
1954	1954-05-17	1954-09-25
1955	1955-06-06	1955-09-06
1956	1956-04-20	1956-09-24
1957	1957-04-28	1957-09-23
1958	1958-05-15	1958-10-04
1959	1959-05-12	1959-09-12
1960	1960-06-01	1960-10-03
1961	1961-05-19	1961-10-15
1962	1962-04-13	1962-09-24
1963	1963-05-17	1963-09-27
1964	1964-06-22	1964-10-11
1965	1965-06-30	1965-10-02
1966	1966-04-04	1966-10-04
1967	1967-05-16	1967-09-28
1968	1968-04-28	1968-09-29
1969	1969-05-07	1969-09-11
1970	1970-05-03	1970-10-03
1971	1971-05-11	1971-10-08
1972	1972-05-27	1972-09-15
1973	1973-05-13	1973-09-12
1974	1974-06-10	1974-10-16
1975	1975-05-13	1975-10-01
1976	1976-05-26	1976-10-13
1977	1977-04-07	1977-09-14
1978	1978-05-21	1978-10-15
1980	1980-07-02	1980-10-08
1981	1981-04-30	1981-09-19
1982	1982-05-25	1982-09-24
1983	1983-05-21	1983-09-26
1984	1984-04-15	1984-10-08
1985	1985-05-22	1985-10-06
1986	1986-05-25	1986-09-07
1987	1987-04-27	1987-10-07
1988	1988-04-13	1988-10-10
1989	1989-06-02	1989-09-25
1990	1990-05-05	1990-10-05
1991	1991-07-02	1991-10-15
1992	1992-05-03	1992-09-30
1993	1993-05-10	1993-10-03
1994	1994-05-10	1994-10-08
1995	1995-05-28	1995-09-23
1996	1996-05-12	1996-10-09
1997	1997-05-11	1997-09-30
1998	1998-04-29	1998-09-17
1999	1999-04-16	1999-09-23
2000	2000-04-04	2000-10-08
2001	2001-05-07	2001-10-04
2002	2002-05-13	2002-09-26
2003	2003-05-24	2003-10-22
2004	2004-04-11	2004-09-11
2005	2005-05-26	2005-10-01
2006	2006-05-15	2006-10-13
2007	2007-05-30	2007-09-13
2008	2008-04-13	2008-10-01
2009	2009-05-17	2009-09-24
2010	2010-06-27	2010-10-01
2011	2011-06-21	2011-09-30
2012	2012-04-22	2012-09-29
2013	2013-05-05	2013-09-19
2014	2014-04-30	2014-10-08
2015	2015-04-28	2015-10-16
2016	2016-04-07	2016-09-27
2017	2017-05-03	2017-09-29
2018	2018-04-24	2018-09-29
2019	2019-05-09	2019-09-13
2020	2020-05-08	2020-10-07
2021	2021-05-05	2021-09-27
2022	2022-04-07	2022-10-16
2023	2023-04-28	2023-10-09
2024	2024-05-10	2024-10-14
2025	2025-05-01	2025-10-07
2026	2026-03-20	2026-10-08

Every Fixed Threshold

Fixed thresholds at Riddle
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	106	103	2015	72
35 C (95 F): Days	104	31	1939	16
40 C (104 F): Days	44	8	1939	4
90 F (32.2 C): Days	106	65	2014	45
100 F (37.8 C): Days	78	17	1939	5
110 F (43.3 C): Days	4	2	2021	1
0 C (32 F): Ice days (max	20	5	1924	1
0 C (32 F): Frost days (min	105	86	1929	15
-10 C (14 F): Days with min	20	8	1932	1
20 C (68 F): Tropical nights (min	12	3	2022	3
10 mm (0.39 in): Days with 10 mm or more rain	108	46	1996	10
25 mm (0.98 in): Days with 25 mm or more rain	106	11	2012	2
50 mm (1.97 in): Days with 50 mm or more rain	44	3	1982	1
100 mm (3.94 in): Days with 100 mm or more rain	3	1	1919	1
10 cm (3.9 in): Days with 10 cm or more snowfall	21	5	1950	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1913.

Download the Data

Data for Riddle 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).

Riddle Threshold Days by Year (USC00357169)

Key Facts for Riddle Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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