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2024 Hennepin County All -Jurisdiction Hazard Mitigation Plan <br />Volume 2 — Hazard Inventory <br />Twin Cities Daily Temperature Records Set from 2000-2023 <br />(Period of Record 1873-2023) <br />150 <br />136 <br />135 <br />120 <br />105 <br />105 <br />90 <br />75 <br />60 <br />45 <br />27 <br />30 <br />15 <br />0 <br />mom <br />Lowest Daily Lowest Daily Highest Daily <br />Highest Daily <br />Minimum Maximum ("cold Maximum <br />Minimum ("warm <br />highs") <br />lows") <br />As noted previously, summer temperatures are increasing in Hennepin County, albeit more slowly than <br />winter temperatures. The average summer daily maximum or high temperature (June through August) <br />shows a very slight decrease over time. This observation is matched by the fact that the count of daytime <br />high temperatures reaching or exceeding 90' F in the Twin Cities has shown no trend since peaking in the <br />1930s. Meanwhile, average summer minimum or low temperatures show have increased by 3.7° F since <br />1895, which exceeds the rate of annual average warming for the county. Therefore, the summer warming <br />experienced in the county so far is attributable to warmer nights, which result in higher minimum <br />temperatures. GRAPHIC 4.3.1E shows summer temperature behavior over in the Twin Cities and <br />Hennepin County. <br />GRAPHIC 4.3.1E Number of 90' F days per year in the Twin Cities, 1873-2023, along with June through <br />August (summer) average maximum and minimum temperatures for Hennepin County, 1895-2023. Data <br />for Twin Cities accessed via https://www.dnr.state.mn.us/climate/historical/acis—stn—meta.html, and <br />for Hennepin County from https://arcgis.dnr.state.mn.us/ewr/climatetrends/. <br />49 <br />