Wind Chill Wind Chill Wind speed (in mph) still air temperature (degrees F) 100 90 80 70 60 50 40 30 20 10 0 -10 -20 -30 wind chill temperature 0 100 90 80 70 60 50 40 30 20 10 0 -10 -20 -30 5 100 90 79 69 58 48 37 27 16 6 -5 -15 -26 -36 10 102 90 77 65 53 41 28 16 4 -9 -21 -33 -46 -58 15 103 90 76 63 49 36 22 9 -4 -18 -31 -45 -58 -72 20 104 89 75 61 47 33 18 4 -10 -24 -39 -53 -67 -81 25 104 89 75 60 45 30 15 1 -14 -29 -44 -59 -73 -88 30 104 89 74 59 44 28 13 -2 -17 -32 -48 -63 -78 -93 35 105 89 74 58 43 27 12 -4 -19 -35 -51 -66 -82 -97 40 105 89 73 58 42 26 10 -5 -21 -37 -53 -68 -84 -100 45 105 89 73 57 42 26 10 -6 -22 -38 -54 -70 -86 -101 50 105 89 73 57 41 25 9 -7 -23 -39 -55 -71 -86 -102 55 105 89 73 57 41 25 9 -7 -23 -39 -55 -71 -87 -103 60 105 89 73 57 41 25 9 -7 -23 -39 -55 -71 -87 -102 65 105 89 73 57 41 26 10 -6 -22 -38 -54 -70 -86 -102 70 105 89 73 58 42 26 10 -6 -21 -37 -53 -69 -85 -101 75 105 89 74 58 42 26 11 -5 -21 -36 -52 -68 -83 -99 80 105 89 74 58 43 27 12 -4 -19 -35 -50 -66 -81 -97 85 105 89 74 59 43 28 13 -3 -18 -33 -49 -64 -79 -95 Note: Wind speeds greater than 40mph add little to the effect. This chart uses the OLD formula and could vary as much as 10º from the New formula Legend No protection required Little danger if properly clothed Increasing Danger of freezing exposed skin Great Danger of freezing exposed skin Formula used to calculate Wind chill Wind chill = 91.4 – (0.474677 – 0.020425 * W + 0.303107 * SQRT(W)) * (91.4 – T) where W = wind speed (mph) and T = temperature (° F)
