Indianapolis Threshold Days by Year (USW00093819)

18 fixed thresholds counted per year at Indianapolis (USW00093819): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Indianapolis Thresholds

Indianapolis: days with a maximum temperature at or above 30 C (86 F) in 79 years, most in 2010 with 84.
Indianapolis: days with a maximum temperature at or below 0 C (32 F) in 79 years, most in 1978 with 57.
Indianapolis: nights with a minimum temperature at or below 0 C (32 F) in 79 years, most in 1976 with 145.
Indianapolis: nights with a minimum temperature at or below -10 C (14 F) in 79 years, most in 1963 with 53.
18 fixed thresholds have at least one qualifying day at Indianapolis.

Days at or above 30 C (86 F)

79 years with a qualifying day

Days per year at Indianapolis with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 84 in 2010.

Days at or above 30 C (86 F) per year at Indianapolis
Year	Days	Decade average
1948	44	49.5
1949	55	49.5
1950	28	50.3
1951	39	50.3
1952	66	50.3
1953	75	50.3
1954	69	50.3
1955	65	50.3
1956	32	50.3
1957	37	50.3
1958	25	50.3
1959	67	50.3
1960	33	43.4
1961	38	43.4
1962	45	43.4
1963	38	43.4
1964	56	43.4
1965	30	43.4
1966	67	43.4
1967	44	43.4
1968	44	43.4
1969	39	43.4
1970	53	45.4
1971	41	45.4
1972	42	45.4
1973	47	45.4
1974	26	45.4
1975	50	45.4
1976	33	45.4
1977	66	45.4
1978	67	45.4
1979	29	45.4
1980	58	49.6
1981	26	49.6
1982	37	49.6
1983	80	49.6
1984	45	49.6
1985	33	49.6
1986	46	49.6
1987	67	49.6
1988	75	49.6
1989	29	49.6
1990	39	47.8
1991	76	47.8
1992	16	47.8
1993	48	47.8
1994	54	47.8
1995	62	47.8
1996	41	47.8
1997	39	47.8
1998	46	47.8
1999	57	47.8
2000	25	41.3
2001	42	41.3
2002	65	41.3
2003	23	41.3
2004	22	41.3
2005	62	41.3
2006	38	41.3
2007	76	41.3
2008	35	41.3
2009	25	41.3
2010	84	56.6
2011	67	56.6
2012	74	56.6
2013	37	56.6
2014	23	56.6
2015	38	56.6
2016	64	56.6
2017	43	56.6
2018	76	56.6
2019	60	56.6
2020	56	54.1
2021	50	54.1
2022	53	54.1
2023	46	54.1
2024	57	54.1
2025	60	54.1
2026	57	54.1

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

First to last qualifying date each year at Indianapolis
Year	First date	Last date
1948	1948-06-03	1948-09-20
1949	1949-05-03	1949-08-26
1950	1950-05-24	1950-10-17
1951	1951-05-01	1951-10-05
1952	1952-05-01	1952-10-01
1953	1953-05-25	1953-10-21
1954	1954-04-25	1954-10-03
1955	1955-05-20	1955-09-21
1956	1956-05-12	1956-09-13
1957	1957-06-11	1957-09-01
1958	1958-06-05	1958-09-05
1959	1959-05-02	1959-09-28
1960	1960-04-23	1960-09-23
1961	1961-06-01	1961-09-24
1962	1962-04-30	1962-09-13
1963	1963-05-09	1963-10-23
1964	1964-05-18	1964-09-21
1965	1965-05-22	1965-09-19
1966	1966-05-23	1966-09-12
1967	1967-05-25	1967-10-04
1968	1968-06-06	1968-09-22
1969	1969-05-28	1969-09-06
1970	1970-04-30	1970-09-23
1971	1971-06-04	1971-10-03
1972	1972-05-21	1972-09-13
1973	1973-06-03	1973-09-25
1974	1974-05-21	1974-08-27
1975	1975-05-20	1975-10-13
1976	1976-06-07	1976-09-08
1977	1977-04-18	1977-09-07
1978	1978-05-19	1978-09-20
1979	1979-05-08	1979-09-12
1980	1980-05-29	1980-09-22
1981	1981-06-08	1981-09-13
1982	1982-05-12	1982-10-06
1983	1983-06-12	1983-10-03
1984	1984-06-06	1984-09-22
1985	1985-05-27	1985-09-09
1986	1986-06-01	1986-09-29
1987	1987-05-14	1987-09-15
1988	1988-05-15	1988-09-22
1989	1989-05-30	1989-09-09
1990	1990-06-08	1990-09-07
1991	1991-05-14	1991-09-16
1992	1992-06-16	1992-09-09
1993	1993-05-10	1993-09-02
1994	1994-05-22	1994-10-01
1995	1995-06-06	1995-09-06
1996	1996-05-18	1996-09-08
1997	1997-06-19	1997-10-04
1998	1998-05-14	1998-09-27
1999	1999-06-05	1999-09-28
2000	2000-05-24	2000-09-03
2001	2001-05-06	2001-09-08
2002	2002-05-31	2002-09-19
2003	2003-06-24	2003-08-28
2004	2004-05-21	2004-09-05
2005	2005-05-11	2005-09-22
2006	2006-05-28	2006-08-27
2007	2007-04-30	2007-10-08
2008	2008-06-05	2008-09-13
2009	2009-05-23	2009-08-27
2010	2010-05-23	2010-10-11
2011	2011-05-11	2011-09-13
2012	2012-05-19	2012-09-06
2013	2013-05-30	2013-09-11
2014	2014-06-01	2014-09-05
2015	2015-05-06	2015-09-08
2016	2016-05-30	2016-09-25
2017	2017-06-03	2017-09-26
2018	2018-05-13	2018-10-06
2019	2019-05-24	2019-10-02
2020	2020-05-25	2020-09-12
2021	2021-05-23	2021-09-19
2022	2022-05-10	2022-09-21
2023	2023-05-29	2023-10-03
2024	2024-05-19	2024-09-21
2025	2025-05-15	2025-10-03
2026	2026-03-22	2026-10-13

Every Fixed Threshold

Fixed thresholds at Indianapolis
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	79	84	2010	57
35 C (95 F): Days	40	25	2012	5
40 C (104 F): Days	2	3	2012	3
90 F (32.2 C): Days	78	58	1983	27
100 F (37.8 C): Days	7	9	2012	9
0 C (32 F): Ice days (max	79	57	1978	24
0 C (32 F): Frost days (min	79	145	1976	57
-10 C (14 F): Days with min	79	53	1963	15
-20 C (-4 F): Days with min	53	19	1963	2
-30 C (-22 F): Days with min	3	2	1994	2
20 C (68 F): Tropical nights (min	79	68	2018	59
25 C (77 F): Days with min	21	5	2011	2
10 mm (0.39 in): Days with 10 mm or more rain	79	48	1990	28
25 mm (0.98 in): Days with 25 mm or more rain	79	20	1957	14
50 mm (1.97 in): Days with 50 mm or more rain	63	5	1950	3
100 mm (3.94 in): Days with 100 mm or more rain	6	1	1969	1
10 cm (3.9 in): Days with 10 cm or more snowfall	59	4	1979	1
25 cm (9.8 in): Days with 25 cm or more snowfall	4	1	1965	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1948.

Download the Data

Data for Indianapolis 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).

Indianapolis Threshold Days by Year (USW00093819)

Key Facts for Indianapolis Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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