"Figure 1. Extreme One-Day Precipitation Events in the Contiguous 48 States, 1910-2023",,
Source: EPA's Climate Change Indicators in the United States: www.epa.gov/climate-indicators,,
"Data source: NOAA, 2024",,
Web update: June 2024,,
Units: percent of land area,,
,,
Year,Index value,9-year moving average
1910,0.092,0.10384375
1911,0.14,0.109160156
1912,0.106,0.112882813
1913,0.075,0.11690625
1914,0.18,0.117777344
1915,0.113,0.108363281
1916,0.09,0.091480469
1917,0.03,0.08059375
1918,0.083,0.083269531
1919,0.119,0.093585938
1920,0.089,0.102832031
1921,0.121,0.1084375
1922,0.099,0.109902344
1923,0.143,0.105
1924,0.085,0.095207031
1925,0.052,0.087707031
1926,0.098,0.085949219
1927,0.107,0.084628906
1928,0.074,0.079039063
1929,0.06,0.072820313
1930,0.064,0.073
1931,0.072,0.081609375
1932,0.089,0.092632813
1933,0.154,0.097210938
1934,0.066,0.094464844
1935,0.065,0.092792969
1936,0.114,0.096535156
1937,0.106,0.098941406
1938,0.127,0.093105469
1939,0.045,0.082761719
1940,0.072,0.077027344
1941,0.075,0.078621094
1942,0.095,0.08209375
1943,0.088,0.081761719
1944,0.077,0.077316406
1945,0.063,0.072070313
1946,0.075,0.068835938
1947,0.054,0.068785156
1948,0.083,0.072597656
1949,0.053,0.079945313
1950,0.117,0.088199219
1951,0.093,0.094953125
1952,0.082,0.100777344
1953,0.121,0.105171875
1954,0.118,0.103011719
1955,0.12,0.091464844
1956,0.028,0.076910156
1957,0.077,0.068460938
1958,0.058,0.06815625
1959,0.082,0.072285156
1960,0.063,0.077410156
1961,0.095,0.081429688
1962,0.098,0.084109375
1963,0.045,0.088082031
1964,0.123,0.094238281
1965,0.099,0.098039063
1966,0.118,0.095738281
1967,0.061,0.090636719
1968,0.092,0.088328125
1969,0.089,0.089214844
1970,0.099,0.089597656
1971,0.088,0.087847656
1972,0.077,0.085992188
1973,0.082,0.085457031
1974,0.101,0.084707031
1975,0.08,0.082753906
1976,0.06,0.0815
1977,0.104,0.08309375
1978,0.072,0.088699219
1979,0.081,0.098734375
1980,0.135,0.10990625
1981,0.122,0.115167969
1982,0.13,0.110953125
1983,0.086,0.102171875
1984,0.082,0.097015625
1985,0.091,0.0973125
1986,0.132,0.0974375
1987,0.083,0.094707031
1988,0.073,0.095199219
1989,0.08,0.1031875
1990,0.162,0.111203125
1991,0.129,0.110554688
1992,0.059,0.106695313
1993,0.101,0.113363281
1994,0.124,0.134351563
1995,0.169,0.158855469
1996,0.231,0.173351563
1997,0.135,0.172417969
1998,0.2,0.157753906
1999,0.148,0.134804688
2000,0.061,0.113753906
2001,0.096,0.104144531
2002,0.117,0.105851563
2003,0.113,0.112910156
2004,0.096,0.122804688
2005,0.162,0.135175781
2006,0.128,0.146265625
2007,0.183,0.150507813
2008,0.165,0.147273438
2009,0.081,0.142101563
2010,0.187,0.138871094
2011,0.131,0.1365625
2012,0.108,0.136128906
2013,0.154,0.141777344
2014,0.121,0.153332031
2015,0.219,0.164523438
2016,0.14,0.169070313
2017,0.194,0.163808594
2018,0.164,0.149167969
2019,0.121,0.132140625
2020,0.066,0.122714844
2021,0.161,0.121496094
2022,0.138,0.119105469
2023,0.095,0.110820313