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2024 Hennepin County All -Jurisdiction Hazard Mitigation Plan <br />Volume 2 — Hazard Inventory <br />90-Degree Days in the Twin Cities, and Summer Average High <br />and Low Temperatures for Hennepin County <br />50 88 <br />N 40 N 84 <br />it 80 <br />o <br />76 <br />�- 30 ' rl 72 "= <br />o�i J 4" <br />20 J ? %lf% 1 1 ' 1 68 <br />64 <br />z 10 Jr % F, y �' h9 F 60 <br />✓r 1 ,ro+v ly-•.4 rF H:! �4rr4rpppppifG it rrr r.. rJ4G4 F iF%!' i F:r� �: G�r r��.rr rr <br />Gorr r, (/i(r r- �/oGrG G✓fir, /araoGroG ,ry .,//. f r0000rGF iy,GGGG /rrrr �o/arr/ GGG I r.�oG%, 56 <br />✓rr ..Ir r /( ;, r/rrGr r ✓. Ir i .rriOrrGrrGr/rrrr/:, f F,. rrrrprr ✓.roGGGG r /, (, :/r// / a GGGo. (GGrrGGrr �/,:.r.,r/r <br />%�GI ..1 r �/ /G �rGG� / ./err G J Ir rfr4rGr/r/r!Irl l Ir/ r9GGrGG r4 ;/ rrrr ip/ 1 r!/��i. GGGoJ44r444r44 i/,//Ir <br />/I ;.:.1 r ;l,rr „1.r,rr. r Ir J.rr r r, f/rrrrrrrrrr// .. I r,,,l ,rrrrr rFGr /.roGGGb / � :/./rrrr rrr..IrroGrrGr. r. /vr/r/ <br />rF /r 1rr9G 0 Jr/ rr//rF I(frllrr / ✓GrGrF /.rrrrrrrrrrrrrrrrr�lr /rr//rFGr/rrrrr,.�/ !GGGr.F r /r//vr/ / / rGGG lrFr/r,�/ /r/r/r <br />52 <br />I-, r-, 00 a) a) O O�i N N M M d' Ln Ln (p (.p F� w w m m O r H r H N <br />00 00 00 00 00 0) 0) 0) 0) 0) 0) 0) 0) 0) 0) 0) 0) 0) 0) 0) 0) 0) O O O O <br />iNumber 9 0 + F Highs —Average Summer Daily High <br />Average Summer Daily Low High Temp Trendline <br />Low Temp Trendline <br />Although summertime high temperatures have not increased over the long-term, there have been signs <br />that high -humidity heat waves are now more common and severe than they were historically (see <br />Humidity sub -section below) <br />Increased Precipitation <br />On a county -averaged basis, precipitation in Hennepin County has increased by an average of 3 inches, or <br />just under 10% since 1895, with virtually all that increase occurring since 1970. As shown in GRAPHIC <br />4.3.11F, using the same data source, five of the 10 wettest years on record, including each of the top-3 and <br />four of the top-5, have occurred since 1990. Only one year since 1990 has made the list of 10 driest years <br />(2022 was 101h driest, not shown). The long-term Twin Cities climate station, currently at the International <br />Airport, set all-time annual precipitation records in 2016, and then again in 2019, and finished the 2010s <br />as the wettest decade on record since the 1870s. <br />Although at least one month from each season has increasing precipitation, the strongest seasonal <br />increases have been in spring and summer, whereas average precipitation during fall and winter hardly <br />changed or decreased slightly from 1895 through 2023. Please refer to TABLE 4.3.1A, at the beginning of <br />this chapter, for detailed information about seasonal precipitation in Hennepin County <br />50 <br />