Rapid City 4NW Threshold Days by Year (USC00396947)

19 fixed thresholds counted per year at Rapid City 4NW (USC00396947): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Rapid City 4NW Thresholds

Rapid City 4NW: days with 10 mm (0.39 in) or more of precipitation in 66 years, most in 2019 with 27.
Rapid City 4NW: days with a maximum temperature at or above 30 C (86 F) in 64 years, most in 1988 with 75.
Rapid City 4NW: days with a maximum temperature at or above 90 F (32.2 C) in 64 years, most in 1988 with 49.
Rapid City 4NW: days with a maximum temperature at or below 0 C (32 F) in 64 years, most in 1996 with 66.
19 fixed thresholds have at least one qualifying day at Rapid City 4NW.

Days at or above 30 C (86 F)

64 years with a qualifying day

Days per year at Rapid City 4NW with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 75 in 1988.

Days at or above 30 C (86 F) per year at Rapid City 4NW
Year	Days	Decade average
1950	30	49
1951	29	49
1952	68	49
1953	49	49
1954	49	49
1955	63	49
1956	53	49
1957	42	49
1958	40	49
1959	67	49
1960	58	44.9
1961	67	44.9
1962	28	44.9
1963	56	44.9
1964	47	44.9
1965	23	44.9
1966	56	44.9
1967	37	44.9
1968	31	44.9
1969	46	44.9
1970	69	52.5
1971	49	52.5
1972	39	52.5
1973	57	52.5
1974	53	52.5
1975	48	52.5
1976	56	52.5
1977	47	52.5
1978	61	52.5
1979	46	52.5
1980	65	51.5
1982	30	51.5
1986	35	51.5
1987	48	51.5
1988	75	51.5
1989	56	51.5
1990	40	34.8
1991	40	34.8
1992	22	34.8
1994	41	34.8
1995	39	34.8
1996	36	34.8
1997	20	34.8
1998	42	34.8
1999	33	34.8
2000	51	49
2005	44	49
2006	52	49
2010	32	34.1
2011	38	34.1
2012	61	34.1
2013	34	34.1
2014	16	34.1
2015	37	34.1
2016	36	34.1
2017	46	34.1
2018	27	34.1
2019	14	34.1
2020	43	50.2
2021	57	50.2
2023	34	50.2
2024	58	50.2
2025	44	50.2
2026	65	50.2

For each year, a bar from the first to the last day at Rapid City 4NW meeting 30 C (86 F).

First to last qualifying date each year at Rapid City 4NW
Year	First date	Last date
1950	1950-06-05	1950-10-15
1951	1951-05-23	1951-08-29
1952	1952-04-26	1952-09-27
1953	1953-06-02	1953-10-11
1954	1954-05-20	1954-09-22
1955	1955-04-30	1955-10-10
1956	1956-06-05	1956-10-16
1957	1957-06-05	1957-10-02
1958	1958-05-21	1958-10-15
1959	1959-06-03	1959-09-15
1960	1960-05-12	1960-09-20
1961	1961-05-10	1961-09-18
1962	1962-04-20	1962-09-11
1963	1963-05-07	1963-10-05
1964	1964-05-17	1964-09-25
1965	1965-05-30	1965-08-28
1966	1966-05-04	1966-09-12
1967	1967-05-22	1967-09-30
1968	1968-06-02	1968-09-14
1969	1969-05-26	1969-09-28
1970	1970-05-17	1970-10-04
1971	1971-06-10	1971-09-13
1972	1972-05-17	1972-09-19
1973	1973-05-18	1973-09-07
1974	1974-06-04	1974-09-26
1975	1975-06-24	1975-10-07
1976	1976-05-14	1976-09-30
1977	1977-04-09	1977-09-17
1978	1978-05-15	1978-09-26
1979	1979-05-16	1979-09-30
1980	1980-04-20	1980-10-08
1982	1982-07-03	1982-09-10
1986	1986-05-04	1986-08-25
1987	1987-04-18	1987-10-03
1988	1988-05-17	1988-09-11
1989	1989-04-22	1989-10-01
1990	1990-06-25	1990-09-26
1991	1991-06-13	1991-10-17
1992	1992-05-01	1992-10-22
1994	1994-05-17	1994-09-29
1995	1995-06-14	1995-09-16
1996	1996-05-17	1996-10-06
1997	1997-06-23	1997-10-04
1998	1998-06-26	1998-09-19
1999	1999-06-21	1999-09-23
2000	2000-05-06	2000-09-19
2005	2005-06-19	2005-10-02
2006	2006-05-19	2006-09-14
2010	2010-05-29	2010-09-29
2011	2011-06-03	2011-10-05
2012	2012-05-17	2012-09-16
2013	2013-05-14	2013-09-23
2014	2014-05-30	2014-09-27
2015	2015-06-10	2015-10-11
2016	2016-06-03	2016-09-12
2017	2017-05-07	2017-09-14
2018	2018-05-27	2018-09-13
2019	2019-07-02	2019-09-18
2020	2020-06-08	2020-09-25
2021	2021-06-05	2021-10-06
2023	2023-06-09	2023-09-19
2024	2024-04-14	2024-10-17
2025	2025-05-11	2025-10-04
2026	2026-04-23	2026-10-12

Every Fixed Threshold

Fixed thresholds at Rapid City 4NW
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	64	75	1988	65
35 C (95 F): Days	63	33	1988	23
40 C (104 F): Days	14	3	1974	2
90 F (32.2 C): Days	64	49	1988	42
100 F (37.8 C): Days	41	8	1988	8
0 C (32 F): Ice days (max	64	66	1996	15
0 C (32 F): Frost days (min	63	187	2019	104
-10 C (14 F): Days with min	63	76	1955	24
-20 C (-4 F): Days with min	62	31	1996	5
-30 C (-22 F): Days with min	14	6	1989	2
20 C (68 F): Tropical nights (min	48	17	1964	9
25 C (77 F): Days with min	3	1	1960	1
10 mm (0.39 in): Days with 10 mm or more rain	66	27	2019	3
25 mm (0.98 in): Days with 25 mm or more rain	61	9	1962	2
50 mm (1.97 in): Days with 50 mm or more rain	24	2	1962	1
100 mm (3.94 in): Days with 100 mm or more rain	1	1	1999	1
10 cm (3.9 in): Days with 10 cm or more snowfall	53	6	1950	1
25 cm (9.8 in): Days with 25 cm or more snowfall	12	2	1950	2
50 cm (19.7 in): Days with 50 cm or more snowfall	1	1	1970	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 Rapid City 4NW 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).

Rapid City 4NW Threshold Days by Year (USC00396947)

Key Facts for Rapid City 4NW Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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