Monthly Precipitation Totals for April Boise, Idaho (airport) for the 82-year period 1940 through 2022 normal (1981-10) = 1.23 inch Rank Rank Among Among Data Year Driest Wettest 0.09 1949 1 83 0.19 1959 c 2 tie 0.19 1977 w+ tie 81 0.22 1961 4 80 0.26 2008 c+ 5 79 0.35 1946 w 6 tie 0.35 1968 c- tie 77 0.36 2004 8 76 0.38 1987 w+ 9 75 0.40 1971 c+ 10 74 0.42 1954 c- 11 73 0.43 1960 c 12 72 0.46 1989 c+ 13 71 0.47 1945 c- 14 70 0.52 1947 w- 15 69 0.55 1950 c+ 16 68 0.60 2015 w- 17 67 0.61 1966 w+ 18 tie 0.61 1999 c+ tie 65 0.62 1972 w+ 20 64 0.66 1992 w+ 21 63 0.67 1974 c+ 22 62 0.69 2016 w 23 61 0.72 2009 c- 24 60 0.79 1982 w- 25 59 0.81 1998 w 26 58 0.83 2002 27 57 0.90 1985 c 28 56 0.92 1962 c- 29 55 0.93 1970 30 54 0.94 1951 w 31 53 0.95 2013 32 52 0.96 2021 c- 33 51 0.99 2018 34 50 1.01 2000 c+ 35 49 1.03 1995 w+ 36 48 1.06 2007 w- 37 47 1.08 1952 38 46 1.12 2020 39 45 1.15 1957 w 40 tie 1.15 2022 c tie 43 1.16 2005 42 42 1.20 1980 w+ 43 tie 1.20 2001 tie 40 1.25 1994 w+ 45 39 1.28 1942 w- 46 38 1.35 1941 w+ 47 tie 1.35 1964 c tie tie 1.35 1969 w tie 35 1.37 1948 50 34 1.39 1943 c+ 51 tie 1.39 2003 W- tie 32 1.47 1967 53 tie 1.47 1996 tie 30 1.49 1973 55 29 1.52 1953 w+ 56 28 1.53 1975 c+ 57 tie 1.53 2011 c- tie 26 1.55 1986 59 25 1.58 2010 w 60 24 1.60 1976 c 61 tie 1.60 1979 tie 22 1.62 1956 c+ 63 tie 1.62 1984 tie 20 1.65 1963 c 65 tie 1.65 1991 w+ tie 18 1.80 1940 w+ 67 tie 1.80 1988 tie 16 1.82 2006 c- 69 15 1.89 1997 w 70 14 1.93 1981 w- 71 13 1.94 1958 w- 72 12 1.99 2019 w 73 11 2.01 2017 74 10 2.08 2012 75 9 2.09 1993 w+ 76 8 2.14 1990 77 7 2.15 2014 78 6 2.29 1983 w+ 79 5 2.34 1978 w- 80 4 2.81 1965 w 81 3 2.92 1944 82 2 3.04 1955 c- 83 1 5/1/2022 c = la nina w = el nino weak c- or w- moderate c or w strong c+ or w+ very strong c++ or w++ precip boise monthly rank airport apr.txt