Boise - Extreme Daily Precipitation 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 2018?

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
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
Reference

Jay Lawrimore. 2016. Global Summary of the Year, Version 1.0. NOAA National Centers for Environmental Information. 

Boise - Extremes
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