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Hennepin County Hazard Mitigation Plan Community Profile <br /> Karst landscapes are most likely found where limestone and dolostone <br /> are at or near the surface. Karst formations are a direct path to <br /> aquifers, thus making groundwater vulnerable to pollution. Hennepin <br /> County has a number of springs, but the actual karst features are <br /> classified as covered karst, having more than 100 feet of sediment on <br /> top. <br /> Ile <br /> Marst Features in <br /> Southeastern Min ni;sota <br /> Updated: November 2002 <br /> Ankip <br /> _ pr i- <br /> —A—L S m-a'1 iris. <br /> At <br /> N <br /> ... -.ate. <br /> F. Climate <br /> The climate in Hennepin County is typical of the Upper Midwest of the <br /> United States. Temperatures vary widely according to season. The <br /> highest recorded temperature (all time daily high) was 108 degrees on <br /> July 14, 1936. The lowest recorded temperature (all time daily low) <br /> was minus 34 degrees on January 22, 1936, and January 19, 1970. <br /> The growing season, or average number of days between freezes, is <br /> 157 days. The maximum seasonal snowfall was 98.6 inches in the <br /> winter of 1983-84. The maximum seasonal rainfall was 40.15 inches <br /> in 1911, and the maximum rainfall in 24 hours was 10 inches on July <br /> 23-24, 1987. <br /> G. Population Growth and Demographics <br /> 5 <br /> r)-%111 r.nmmionitr Prnfiln rind, <br />