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2024 Hennepin County All -Jurisdiction Hazard Mitigation Plan <br />Volume 2 — Hazard Inventory <br />GRAPHIC 4.3.11F Annual precipitation, averaged over Hennepin County, 1895-2023, with the trendline <br />showing average rate of change over the period of record. Table at right shows ten warmest years. Data <br />from Minnesota DNR Climate Trends Tool (https://arcgis.dnr.state.mn.us/ewr/climatetrends/). <br />4U <br />M <br />go <br />Precipitation For Hennepin, Mmary-December Year <br />Precwp <br />(in) ' <br />Year <br />-- rreciip (in1991 <br />1895- 2019 <br />2023 <br />'Rciid_ 0. 2002 <br />23"� 1965 <br />Decade <br />2M <br />1951 <br />1977 <br />1968 <br />1975 <br />1993 <br />41.91 <br />41.18 <br />40.33 <br />39.7 <br />38,63 <br />37.73 <br />37.38 <br />3TO6 <br />36.7 <br />3.59 <br />Daily and multi -day extremes of rain have become more common in recent decades as well. Rainfall <br />records for the Twin Cities go back to 1871, but the period since 1970 dominates the heavy rain statistics, <br />with four of the top -six daily rainfall totals occurring during that period, including the two largest events <br />on record —which led to significant and even catastrophic flooding. <br />As shown in GRAPHIC 4.3.1G, annual precipitation and the number of days with heavy rain, or at least <br />one inch of precipitation, both increased during the most recent several decades. <br />Seasonal snowfall also has increased and remained historically high during the period of strong winter <br />warming and the great climatic change in Hennepin County. With snowfall records back to 1884-85, each <br />of the top three, tour of the top five, and 14 of the 20 snowiest seasons on record occurred after 1980. <br />Most recently, the 2022-23 winter was third snowiest on record in the Twin Cities, with 90.3 inches. The <br />period 1980-2023 represents just 32% of the station history of the Twin Cities, but accounts for 70% of <br />the top-20 seasonal snowfall totals. <br />Daily and multi -day snowfall extremes are also more common in recent decades. Eight of the 10 largest <br />daily snowfalls on record occurred after 1980, including each of the top four. GRAPHIC 4.3.1H shows how <br />days with heavy snow and seasonal snowfall have hit historical high marks only recently. <br />GRAPHIC 4.3.1G (top) Annual precipitation and average number of days receiving at least one inch of <br />precipitation, by decade in the Twin Cities. GRAPHIC 4.3.1H (bottom) Seasonal snowfall and average <br />number of days with at least 4 inches of snow. Data source, both graphics: Applied Climate Information <br />System, accessed via https://www.dnr.state.mn.us/climate/historical/acis_stn_meta.htm1. <br />51 <br />