Rapid City Forrest Threshold Days by Year (CA005012333)

17 fixed thresholds counted per year at Rapid City Forrest (CA005012333): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Rapid City Forrest Thresholds

Rapid City Forrest: days with 10 mm (0.39 in) or more of precipitation in 46 years, most in 1890 with 24.
Rapid City Forrest: days with 25 mm (0.98 in) or more of precipitation in 43 years, most in 1898 with 7.
Rapid City Forrest: days with 10 cm (3.9 in) or more of snowfall in 43 years, most in 1897 with 8.
Rapid City Forrest: days with a maximum temperature at or below 0 C (32 F) in 15 years, most in 1932 with 145.
17 fixed thresholds have at least one qualifying day at Rapid City Forrest.

Days at or above 30 C (86 F)

13 years with a qualifying day

Days per year at Rapid City Forrest with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 30 in 1936.

Days at or above 30 C (86 F) per year at Rapid City Forrest
Year	Days	Decade average
1923	5	7.4
1925	6	7.4
1926	8	7.4
1928	6	7.4
1929	12	7.4
1930	9	14.1
1931	20	14.1
1932	5	14.1
1933	20	14.1
1934	15	14.1
1935	4	14.1
1936	30	14.1
1937	10	14.1

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

First to last qualifying date each year at Rapid City Forrest
Year	First date	Last date
1923	1923-06-17	1923-09-03
1925	1925-05-29	1925-09-02
1926	1926-06-27	1926-07-31
1928	1928-05-22	1928-09-01
1929	1929-06-16	1929-08-30
1930	1930-07-08	1930-08-30
1931	1931-05-14	1931-09-08
1932	1932-05-13	1932-08-19
1933	1933-05-31	1933-08-22
1934	1934-05-05	1934-08-17
1935	1935-07-28	1935-08-14
1936	1936-05-27	1936-09-03
1937	1937-06-23	1937-08-27

Every Fixed Threshold

Fixed thresholds at Rapid City Forrest
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	13	30	1936	10
35 C (95 F): Days	7	7	1931	1
40 C (104 F): Days	2	1	1931	1
90 F (32.2 C): Days	13	16	1936	4
100 F (37.8 C): Days	2	1	1931	1
0 C (32 F): Ice days (max	15	145	1932	139
0 C (32 F): Frost days (min	15	227	1929	198
-10 C (14 F): Days with min	15	142	1935	115
-20 C (-4 F): Days with min	15	89	1936	56
-30 C (-22 F): Days with min	15	46	1936	12
-40 C (-40 F): Days with min	6	11	1936	11
20 C (68 F): Tropical nights (min	3	4	1936	4
10 mm (0.39 in): Days with 10 mm or more rain	46	24	1890	13
25 mm (0.98 in): Days with 25 mm or more rain	43	7	1898	1
50 mm (1.97 in): Days with 50 mm or more rain	13	3	1911	2
10 cm (3.9 in): Days with 10 cm or more snowfall	43	8	1897	6
25 cm (9.8 in): Days with 25 cm or more snowfall	15	2	1894	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1923.

Download the Data

Data for Rapid City Forrest 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 Forrest Threshold Days by Year (CA005012333)

Key Facts for Rapid City Forrest Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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