Boise ID Most Precipitation in a Day for Each Year

This page lists the biggest rainstorms or snowstorms of the year in Boise, Idaho along with the date they occurred. The information answers questions like: When was the last time more than one-and-a-half inches of precipitation landed on Boise in a single day? What was the rainiest day of 2019?

The list gives the highest daily precipitation for each year in Boise and the date that it happened. A date with a plus sign beside it means the same amount of moisture also fell on at least one other day earlier that year.

These records go back to 1911, with just a gap in data from 1927 to 1934. For the years with measurements, the heaviest downpour documented for a single day was 1.91 inches (48.5 millimetres) on June 12, 1958.

Since 1940 the precipitation extremes were observed at Boise Airport. Before then, the weather station was on the outskirts of Boise.

Most precipitation in one day for recent years in Boise
Inches	Date	Millimetres
1.46	August 26, 2023	37.1
0.79	June 12, 2022	20.1
0.83	July 31, 2021	21.1
1.21	June 13, 2020	30.7
0.83	May 28, 2019	21.1
0.95	October 09, 2018	24.1
1.40	March 30, 2017	35.6
0.47	April 23, 2016	11.9
0.67	November 25, 2015	17.0
1.15	November 01, 2014	29.2
0.72	October 28, 2013	18.3
1.09	April 26, 2012	27.7
0.77	January 16, 2011	19.6
1.41	May 22, 2010	35.8

Highest daily precipitation recorded at Boise each year
Inches	Date	Millimetres
0.91	August 06, 2009	23.1
0.90	September 20, 2008	22.9
0.78	June 10, 2007	19.8
0.66	April 04, 2006	16.8
0.88	May 05, 2005	22.4
0.66	December 08, 2004	16.8
0.72	January 27, 2003	18.3
0.86	December 30, 2002	21.8
0.74	April 11, 2001	18.8
0.90	October 12, 2000	22.9
0.43	January 20, 1999	10.9
0.97	May 26, 1998	24.6
0.82	April 23, 1997	20.8
0.71	December 20, 1996	18.0
0.60	November 12, 1995	15.2
0.65	December 01, 1994	16.5
0.88	March 17, 1993	22.4
0.58	June 30, 1992	14.7
0.64	May 17, 1991	16.3
1.77	May 29, 1990	45.0
0.65	September 17, 1989	16.5
0.79	April 20, 1988	20.1
0.70	February 13, 1987	17.8
0.76	February 19, 1986	19.3
0.78	July 30, 1985	19.8
0.90	April 08, 1984	22.9
1.10	April 30, 1983	27.9
0.68	October 29, 1982	17.3
1.60	March 20, 1981	40.6
0.95	April 24, 1980	24.1
1.61	August 13, 1979	40.9
0.61	January 10, 1978	15.5
1.11	June 10, 1977	28.2
1.73	September 11, 1976	43.9
0.49	October 21, 1975	12.4
0.65	October 21, 1974	16.5
0.84	April 13, 1973	21.3
0.57	March 02, 1972	14.5
0.78	November 26, 1971	19.8
0.71	June 29, 1970	18.0
1.27	April 06, 1969	32.3
0.67	December 23, 1968	17.0
0.62	April 19, 1967	15.7
0.40	November 06, 1966	10.2
0.77	January 28, 1965	19.6
1.03	May 27, 1964	26.2
0.66	June 04, 1963	16.8
1.09	May 24, 1962	27.7
0.69	March 23, 1961	17.5
0.94	July 30, 1960	23.9
0.66	September 19, 1959	16.8
1.91	June 12, 1958	48.5
0.75	May 18, 1957	19.1
1.06	April 26, 1956	26.9
1.03	December 23, 1955	26.2
0.67	May 31, 1954	17.0
1.13	January 18, 1953	28.7
0.88	March 11, 1952	22.4
0.92	February 04, 1951	23.4
1.00	May 01, 1950	25.4
0.56	November 23, 1949	14.2
0.72	February 21, 1948	18.3
0.54	March 31, 1947	13.7
0.46	January 22, 1946	11.7
0.70	March 26, 1945	17.8
0.78	April 11, 1944	19.8
1.05	March 08, 1943	26.7
1.13	May 23, 1942	28.7
0.97	June 07, 1941	24.6
0.75	March 31, 1940	19.1
0.94	September 13, 1939	23.9
1.80	May 01, 1938	45.7
0.96	November 19, 1937	24.4
0.54	June 07, 1936	13.7
0.62	April 08, 1935	15.7
–	1933	–
–	1932	–
–	1931	–
–	1930	–
–	1929	–
–	1928	–
–	1927	–
0.49	July 07, 1926	12.4
1.02	October 06, 1925	25.9
0.93	December 30, 1924	23.6
0.80	October 07, 1923	20.3
0.59	May 26, 1922	15.0
0.53	May 21, 1921	13.5
0.74	October 10, 1920	18.8
0.74	September 17, 1919	18.8
1.15	September 23, 1918	29.2
1.00	September 23, 1917	25.4
1.65	February 02, 1916	41.9
0.71	May 13, 1915	18.0
0.30	June 20, 1914 +	7.6
1.10	July 24, 1913	27.9
1.02	October 27, 1912	25.9
0.79	May 15, 1911	20.1

Boise - Extreme Daily Precipitation for Each Year

Reference

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