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Table 4. Cooling Power of Wind on Exposed Flesh Expressed as Equivalent Temperature(under calm conditions) <br /> Actual Temperature Reading(F) <br /> 50 40 30 20 10 0 -10 -20 -30 -40 -50 -60 <br /> Estimated Wind Speed Equivalent Chill Temperature(F) <br /> in-ph) <br /> Calm 50 40 30 20 10 0 -10 -20 -30 -40 -50 -60 <br /> 5 48 37 27 16 6 -5 -15 -26 -36 -47 -57 -68 <br /> 10 40 28 16 4 -9 -24 -33 -46 -58 -70 -83 -95 <br /> 15 36 22 9 -5 -18 -32 -45 -58 -72 -85 -99 -112 <br /> 20 32 18 4 -10 -25 -39 -53 -67 -82 -96 -110 -121 <br /> _[ <br /> 25 30 16 0 -15 -29 -44 -59 -74 -88 -104 -118 -133 <br /> 30 28 13 -2 -18 -33 -48 -63 -79 -94 -109 -125 -140 <br /> 35 27 11 -4 -20 -35 -51 -67 -82 -98 -113 -129 -145 <br /> 40 26 10 -6 -21 -37 -53 -69 -85 -100 -116 -132 -148 <br /> (Wind speeds greater LITTLE DANGER INCREASING DANGER GREAT DANGER <br /> than 40 mph have little In<hr with dry skin. Maximum danger of Danger from freezing of exposed Flesh may freeze within 30 seconds. <br /> additional effect.) false sense of security. flesh within one minute. <br /> Trenchfoot and immersion foot may occur at any point on this chart. <br /> *Developed by U.S.Army Research Institute of Environmental Medicine,Natick,MA. <br />