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2024 Hennepin County All -Jurisdiction Hazard Mitigation Plan <br />Volume 2 — Hazard Inventory <br />Confidence Hazard <br />Recent & Current Observations <br />cold <br />Rapid decline in severity & frequency <br />JExtreme <br />xtreme rainfall andl heavy <br />J. <br />Becoming (larger and mare frequent <br />nowfall <br />..--.— ..--- <br />heat waves <br />�.umid <br />Some increase in maximum dew point and Heat <br />am <br />Index values since 1980 <br />?Ao erltellVtOwTornadoes, hall,, thunderstorm <br />Int:ens4ty and frequency unchanged, but seasons <br />wind's <br />expanding aggressively <br />Low <br />Drought and dry spells <br />Intense & major episodes in early 2020s but no long ­ <br />term trend <br />Lowest <br />Summer high temperature <br />Highest temperatures still yield within historical <br />extremes <br />ranges, and number of hot days not yet increasing <br />Worming in Hennepin County <br />County -averaged statistic indicate Hennepin County has warmed a total of 3.1° F since 1895, or at an <br />average rate of +0.24° F per decade, which exceeds global and national averages. As illustrated in <br />GRAPHIC 4.3.1113, using the same data source, nine of the 10 warmest years on record —including the <br />warmest year in 2012—have occurred since 1990. <br />GRAPHIC 4.3.1113 Annual temperature, 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 />Avg Tern�p <br />Average Temperature For Hennepin, January -December Year eF) <br />Year <br />Avg Ternp 2812 <br />i,;,rl 1931 <br />1895.. <br />2023 1987 <br />Trend 0 1998 <br />2:4"N <br />Decade 2M <br />2023 <br />20016 <br />2921 <br />1999 <br />2015 <br />4&98 <br />48.88 <br />48.76 <br />48.22 <br />47.87 <br />7,74 <br />47.82. <br />47.5 <br />48.91 <br />46,86 <br />Although temperatures are increasing in every season, winter (December through February) has warmed <br />approximately three times faster than summer (June through August), with a total warming of 5.0° F <br />versus 1.7° F. Daily overnight low temperatures have also increased about three times faster than daily <br />high temperatures. The most extreme differences in warming rates are between winter low <br />temperatures, which have increased by an average of 6.4° F since 1895, and summer high temperatures, <br />47 <br />