Heat and Humidity
MODEL POLICY FOR MANAGING HEAT & HUMIDITY Adopted March 22, 2013 1.
Thirty minutes prior to the start of an activity, and again 60 minutes after the start of that activity, take temperature and humidity readings at the site of the activity. Using a digital sling psychrometer is recommended. Record the readings in writing and maintain the information in files of school administration. Each school is to designate whose duties these are: generally the athletic director, head coach or certified athletic trainer.
2.
Factor the temperature and humidity into the Heat Index Calculator and Chart to determine the Heat Index. If a digital sling psychrometer is being used, the calculation is automatic.
3.
If the Heat Index is below 95 degrees:
All Sports o Provide ample amounts of water. This means that water should always be available and athletes should be able to take in as much water as they desire. o Optional water breaks every 30 minutes for 10 minutes in duration. o Ice-down towels for cooling. o Watch/monitor athletes carefully for necessary action.
If the Heat Index is 95 degrees to 99 degrees:
All Sports o Provide ample amounts of water. This means that water should always be available and athletes should be able to take in as much water as they desire. o Optional water breaks every 30 minutes for 10 minutes in duration. o Ice-down towels for cooling. o Watch/monitor athletes carefully for necessary action.
Contact sports and activities with additional equipment: o Helmets and other possible equipment removed while not involved in contact.
Reduce time of outside activity. Consider postponing practice to later in the day.
Recheck temperature and humidity every 30 minutes to monitor for increased Heat Index.
If the Heat Index is above 99 degrees to 104 degrees:
All Sports o Provide ample amounts of water. This means that water should always be available and athletes should be able to take in as much water as they desire. o Mandatory water breaks every 30 minutes for 10 minutes in duration. o Ice-down towels for cooling. o Watch/monitor athletes carefully for necessary action. o Alter uniform by removing items if possible. o Allow for changes to dry t-shirts and shorts. o Reduce time of outside activity as well as indoor activity if air conditioning is unavailable. o Postpone practice to later in the day.
Contact sports and activities with additional equipment o Helmets and other possible equipment removed if not involved in contact or necessary for safety. If necessary for safety, suspend activity.
Recheck temperature and humidity every 30 minutes to monitor for increased Heat Index.
If the Heat Index is above 104 degrees:
All sports o Stop all outside activity in practice and/or play, and stop all inside activity if air conditioning is unavailable.
Note: When the temperature is below 80 degrees there is no combination of heat and humidity that will result in need to curtail activity. Over for Heat Index PDF
HEAT INDEX CALCULATION AND CHART
Relative Humidity at Site
Temperature (Fahrenheit) 100 99 98 97 96 95 94 93 92 91 90 89 88 87 86 85 84 83 82 81 80 79 78 77 76 75 74 73 72 71 70 69 68 67 66 65 64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13
79 84 84 84 84 83 83 83 83 83 83 83 83 83 83 83 83 83 82 82 82 82 82 82 82 82 82 82 82 82 81 81 81 81 81 81 81 81 81 81 81 81 81 81 80 80 80 80 80 80 80 80 80 80 80 80 80 80 79 79 79 79 79 79 79 79 79 79 79 79 79 79 79 78 78 78 78 78 78 78 78 78 78 78 78 78 78 78 78
80 87 87 87 87 87 86 86 86 86 86 86 85 85 85 85 85 85 85 85 84 84 84 84 84 84 84 83 83 83 83 83 83 83 83 82 82 82 82 82 82 82 82 82 81 81 81 81 81 81 81 81 81 81 81 80 80 80 80 80 80 80 80 80 80 80 80 79 79 79 79 79 79 79 79 79 79 79 79 79 79 79 79 78 78 78 78 78 78
81 91 91 90 90 90 90 89 89 89 89 88 88 88 88 88 87 87 87 87 87 86 86 86 86 86 85 85 85 85 85 85 84 84 84 84 84 84 84 83 83 83 83 83 83 83 82 82 82 82 82 82 82 81 81 81 81 81 81 81 81 81 81 80 80 80 80 80 80 80 80 80 80 80 80 80 79 79 79 79 79 79 79 79 79 79 79 79 79
82 95 94 94 94 93 93 93 92 92 92 91 91 91 91 90 90 90 90 89 89 89 89 88 88 88 88 87 87 87 87 86 86 86 86 86 85 85 85 85 85 84 84 84 84 84 84 83 83 83 83 83 83 82 82 82 82 82 82 82 82 81 81 81 81 81 81 81 81 81 81 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80
83 99 98 98 97 97 97 96 96 95 95 95 94 94 94 93 93 93 92 92 92 91 91 91 90 90 90 90 89 89 89 88 88 88 88 87 87 87 87 86 86 86 86 85 85 85 85 85 84 84 84 84 84 84 83 83 83 83 83 83 82 82 82 82 82 82 82 82 82 81 81 81 81 81 81 81 81 81 81 81 81 81 81 80 80 80 80 80 80
84 103 102 102 101 101 100 100 99 99 98 98 98 97 97 96 96 96 95 95 94 94 94 93 93 93 92 92 91 91 91 90 90 90 90 89 89 89 88 88 88 88 87 87 87 86 86 86 86 86 85 85 85 85 85 84 84 84 84 84 83 83 83 83 83 83 83 82 82 82 82 82 82 82 82 82 82 82 81 81 81 81 81 81 81 81 81 81 81
85 107 106 106 105 105 104 104 103 103 102 102 101 101 100 100 99 99 98 98 97 97 96 96 96 95 95 94 94 93 93 93 92 92 92 91 91 91 90 90 90 89 89 89 88 88 88 87 87 87 87 86 86 86 86 86 85 85 85 85 85 84 84 84 84 84 84 83 83 83 83 83 83 83 83 82 82 82 82 82 82 82 82 82 82 82 82 82 82
86 112 111 110 110 109 108 108 107 106 106 105 105 104 104 103 102 102 101 101 100 100 99 99 98 98 97 97 96 96 96 95 95 94 94 93 93 93 92 92 91 91 91 90 90 90 89 89 89 88 88 88 88 87 87 87 87 86 86 86 86 85 85 85 85 85 85 84 84 84 84 84 84 84 83 83 83 83 83 83 83 83 83 83 83 83 83 83 83
87 116 116 115 114 113 113 112 111 111 110 109 109 108 107 107 106 105 105 104 104 103 102 102 101 101 100 100 99 99 98 98 97 97 96 96 95 95 94 94 93 93 93 92 92 92 91 91 90 90 90 89 89 89 88 88 88 88 87 87 87 87 86 86 86 86 86 85 85 85 85 85 85 84 84 84 84 84 84 84 84 84 84 84 84 83 83 83 83
88 121 120 120 119 118 117 116 116 115 114 113 113 112 111 110 110 109 108 108 107 106 106 105 104 104 103 103 102 101 101 100 100 99 99 98 98 97 97 96 96 95 95 94 94 93 93 93 92 92 91 91 91 90 90 90 89 89 89 88 88 88 88 87 87 87 87 86 86 86 86 86 86 85 85 85 85 85 85 85 85 85 84 84 84 84 84 84 84
89 126 125 124 124 123 122 121 120 119 118 117 117 116 115 114 113 113 112 111 110 110 109 108 108 107 106 106 105 104 104 103 102 102 101 101 100 99 99 98 98 97 97 96 96 95 95 94 94 94 93 93 92 92 92 91 91 91 90 90 90 89 89 89 88 88 88 88 87 87 87 87 87 86 86 86 86 86 86 86 85 85 85 85 85 85 85 85 85
90 132 131 130 129 128 127 126 125 124 123 122 121 120 119 118 117 117 116 115 114 113 113 112 111 110 109 109 108 107 107 106 105 105 104 103 103 102 101 101 100 100 99 99 98 98 97 96 96 96 95 95 94 94 93 93 92 92 92 91 91 91 90 90 90 89 89 89 89 88 88 88 88 88 87 87 87 87 87 87 86 86 86 86 86 86 86 86 86
91 137 136 135 134 133 132 131 130 129 127 126 125 125 124 123 122 121 120 119 118 117 116 115 115 114 113 112 111 111 110 109 108 108 107 106 105 105 104 103 103 102 102 101 100 100 99 99 98 98 97 97 96 96 95 95 94 94 93 93 93 92 92 91 91 91 90 90 90 90 89 89 89 89 88 88 88 88 88 88 87 87 87 87 87 87 87 87 87
92 143 142 140 139 138 137 136 135 133 132 131 130 129 128 127 126 125 124 123 122 121 120 119 118 117 116 116 115 114 113 112 111 111 110 109 108 108 107 106 105 105 104 103 103 102 101 101 100 100 99 99 98 97 97 96 96 96 95 95 94 94 93 93 93 92 92 92 91 91 91 90 90 90 90 89 89 89 89 89 88 88 88 88 88 88 88 88 88
93 149 147 146 145 144 142 141 140 139 137 136 135 134 133 132 130 129 128 127 126 125 124 123 122 121 120 119 118 117 116 116 115 114 113 112 111 110 110 109 108 107 107 106 105 105 104 103 103 102 101 101 100 100 99 98 98 97 97 96 96 95 95 95 94 94 93 93 93 92 92 92 91 91 91 91 90 90 90 90 89 89 89 89 89 89 89 89 89
94 155 153 152 151 149 148 147 145 144 143 141 140 139 138 136 135 134 133 132 131 129 128 127 126 125 124 123 122 121 120 119 118 117 116 115 114 114 113 112 111 110 109 109 108 107 106 106 105 104 104 103 102 102 101 100 100 99 99 98 98 97 97 96 96 95 95 94 94 94 93 93 93 92 92 92 91 91 91 91 91 90 90 90 90 90 90 90 89
95 161 160 158 157 155 154 152 151 149 148 147 145 144 143 141 140 139 137 136 135 134 133 131 130 129 128 127 126 125 124 123 122 121 120 119 118 117 116 115 114 113 112 111 111 110 109 108 107 107 106 105 105 104 103 103 102 101 101 100 100 99 98 98 97 97 96 96 96 95 95 94 94 94 93 93 93 92 92 92 92 91 91 91 91 91 91 91 90
96 168 166 164 163 161 160 158 157 155 154 152 151 149 148 146 145 144 142 141 140 138 137 136 135 133 132 131 130 129 127 126 125 124 123 122 121 120 119 118 117 116 115 114 113 113 112 111 110 109 108 108 107 106 105 105 104 103 103 102 101 101 100 100 99 99 98 98 97 97 96 96 95 95 95 94 94 94 93 93 93 93 92 92 92 92 92 91 91
97 174 172 171 169 167 166 164 162 161 159 158 156 155 153 152 150 149 147 146 144 143 142 140 139 138 136 135 134 133 131 130 129 128 127 126 125 123 122 121 120 119 118 117 116 115 114 114 113 112 111 110 109 109 108 107 106 106 105 104 104 103 102 102 101 100 100 99 99 98 98 97 97 97 96 96 95 95 95 94 94 94 94 93 93 93 93 92 92
98 181 179 177 176 174 172 170 169 167 165 164 162 160 159 157 155 154 152 151 149 148 146 145 144 142 141 140 138 137 136 134 133 132 131 129 128 127 126 125 124 123 122 120 119 118 117 116 116 115 114 113 112 111 110 109 109 108 107 106 106 105 104 104 103 102 102 101 101 100 99 99 98 98 98 97 97 96 96 96 95 95 95 94 94 94 94 93 93
99 188 186 184 182 180 179 177 175 173 171 170 168 166 164 163 161 159 158 156 155 153 151 150 148 147 145 144 143 141 140 138 137 136 135 133 132 131 130 128 127 126 125 124 123 122 120 119 118 117 116 115 115 114 113 112 111 110 109 109 108 107 106 106 105 104 104 103 102 102 101 101 100 100 99 99 98 98 97 97 97 96 96 96 95 95 95 95 94
100 195 193 191 189 187 185 183 181 179 178 176 174 172 170 168 167 165 163 162 160 158 157 155 153 152 150 149 147 146 144 143 141 140 139 137 136 135 133 132 131 129 128 127 126 125 124 123 121 120 119 118 117 116 115 114 114 113 112 111 110 109 108 108 107 106 106 105 104 104 103 102 102 101 101 100 100 99 99 98 98 97 97 97 96 96 96 96 95
Thirty minutes prior to the start of an activity, and again 60 minutes after the start of that activity, take temperature and humidity readings at the site of the activity. Using a digital sling psychrometer is recommended. Record the readings in writing and maintain the information in files of school administration. Each school is to designate whose duties these are: generally the athletic director, head coach or certified athletic trainer.
2.
Factor the temperature and humidity into the Heat Index Calculator and Chart to determine the Heat Index. If a digital sling psychrometer is being used, the calculation is automatic.
3.
If the Heat Index is below 95 degrees:
All Sports o Provide ample amounts of water. This means that water should always be available and athletes should be able to take in as much water as they desire. o Optional water breaks every 30 minutes for 10 minutes in duration. o Ice-down towels for cooling. o Watch/monitor athletes carefully for necessary action.
If the Heat Index is 95 degrees to 99 degrees:
All Sports o Provide ample amounts of water. This means that water should always be available and athletes should be able to take in as much water as they desire. o Optional water breaks every 30 minutes for 10 minutes in duration. o Ice-down towels for cooling. o Watch/monitor athletes carefully for necessary action.
Contact sports and activities with additional equipment: o Helmets and other possible equipment removed while not involved in contact.
Reduce time of outside activity. Consider postponing practice to later in the day.
Recheck temperature and humidity every 30 minutes to monitor for increased Heat Index.
If the Heat Index is above 99 degrees to 104 degrees:
All Sports o Provide ample amounts of water. This means that water should always be available and athletes should be able to take in as much water as they desire. o Mandatory water breaks every 30 minutes for 10 minutes in duration. o Ice-down towels for cooling. o Watch/monitor athletes carefully for necessary action. o Alter uniform by removing items if possible. o Allow for changes to dry t-shirts and shorts. o Reduce time of outside activity as well as indoor activity if air conditioning is unavailable. o Postpone practice to later in the day.
Contact sports and activities with additional equipment o Helmets and other possible equipment removed if not involved in contact or necessary for safety. If necessary for safety, suspend activity.
Recheck temperature and humidity every 30 minutes to monitor for increased Heat Index.
If the Heat Index is above 104 degrees:
All sports o Stop all outside activity in practice and/or play, and stop all inside activity if air conditioning is unavailable.
Note: When the temperature is below 80 degrees there is no combination of heat and humidity that will result in need to curtail activity. Over for Heat Index PDF
HEAT INDEX CALCULATION AND CHART
Relative Humidity at Site
Temperature (Fahrenheit) 100 99 98 97 96 95 94 93 92 91 90 89 88 87 86 85 84 83 82 81 80 79 78 77 76 75 74 73 72 71 70 69 68 67 66 65 64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13
79 84 84 84 84 83 83 83 83 83 83 83 83 83 83 83 83 83 82 82 82 82 82 82 82 82 82 82 82 82 81 81 81 81 81 81 81 81 81 81 81 81 81 81 80 80 80 80 80 80 80 80 80 80 80 80 80 80 79 79 79 79 79 79 79 79 79 79 79 79 79 79 79 78 78 78 78 78 78 78 78 78 78 78 78 78 78 78 78
80 87 87 87 87 87 86 86 86 86 86 86 85 85 85 85 85 85 85 85 84 84 84 84 84 84 84 83 83 83 83 83 83 83 83 82 82 82 82 82 82 82 82 82 81 81 81 81 81 81 81 81 81 81 81 80 80 80 80 80 80 80 80 80 80 80 80 79 79 79 79 79 79 79 79 79 79 79 79 79 79 79 79 78 78 78 78 78 78
81 91 91 90 90 90 90 89 89 89 89 88 88 88 88 88 87 87 87 87 87 86 86 86 86 86 85 85 85 85 85 85 84 84 84 84 84 84 84 83 83 83 83 83 83 83 82 82 82 82 82 82 82 81 81 81 81 81 81 81 81 81 81 80 80 80 80 80 80 80 80 80 80 80 80 80 79 79 79 79 79 79 79 79 79 79 79 79 79
82 95 94 94 94 93 93 93 92 92 92 91 91 91 91 90 90 90 90 89 89 89 89 88 88 88 88 87 87 87 87 86 86 86 86 86 85 85 85 85 85 84 84 84 84 84 84 83 83 83 83 83 83 82 82 82 82 82 82 82 82 81 81 81 81 81 81 81 81 81 81 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80
83 99 98 98 97 97 97 96 96 95 95 95 94 94 94 93 93 93 92 92 92 91 91 91 90 90 90 90 89 89 89 88 88 88 88 87 87 87 87 86 86 86 86 85 85 85 85 85 84 84 84 84 84 84 83 83 83 83 83 83 82 82 82 82 82 82 82 82 82 81 81 81 81 81 81 81 81 81 81 81 81 81 81 80 80 80 80 80 80
84 103 102 102 101 101 100 100 99 99 98 98 98 97 97 96 96 96 95 95 94 94 94 93 93 93 92 92 91 91 91 90 90 90 90 89 89 89 88 88 88 88 87 87 87 86 86 86 86 86 85 85 85 85 85 84 84 84 84 84 83 83 83 83 83 83 83 82 82 82 82 82 82 82 82 82 82 82 81 81 81 81 81 81 81 81 81 81 81
85 107 106 106 105 105 104 104 103 103 102 102 101 101 100 100 99 99 98 98 97 97 96 96 96 95 95 94 94 93 93 93 92 92 92 91 91 91 90 90 90 89 89 89 88 88 88 87 87 87 87 86 86 86 86 86 85 85 85 85 85 84 84 84 84 84 84 83 83 83 83 83 83 83 83 82 82 82 82 82 82 82 82 82 82 82 82 82 82
86 112 111 110 110 109 108 108 107 106 106 105 105 104 104 103 102 102 101 101 100 100 99 99 98 98 97 97 96 96 96 95 95 94 94 93 93 93 92 92 91 91 91 90 90 90 89 89 89 88 88 88 88 87 87 87 87 86 86 86 86 85 85 85 85 85 85 84 84 84 84 84 84 84 83 83 83 83 83 83 83 83 83 83 83 83 83 83 83
87 116 116 115 114 113 113 112 111 111 110 109 109 108 107 107 106 105 105 104 104 103 102 102 101 101 100 100 99 99 98 98 97 97 96 96 95 95 94 94 93 93 93 92 92 92 91 91 90 90 90 89 89 89 88 88 88 88 87 87 87 87 86 86 86 86 86 85 85 85 85 85 85 84 84 84 84 84 84 84 84 84 84 84 84 83 83 83 83
88 121 120 120 119 118 117 116 116 115 114 113 113 112 111 110 110 109 108 108 107 106 106 105 104 104 103 103 102 101 101 100 100 99 99 98 98 97 97 96 96 95 95 94 94 93 93 93 92 92 91 91 91 90 90 90 89 89 89 88 88 88 88 87 87 87 87 86 86 86 86 86 86 85 85 85 85 85 85 85 85 85 84 84 84 84 84 84 84
89 126 125 124 124 123 122 121 120 119 118 117 117 116 115 114 113 113 112 111 110 110 109 108 108 107 106 106 105 104 104 103 102 102 101 101 100 99 99 98 98 97 97 96 96 95 95 94 94 94 93 93 92 92 92 91 91 91 90 90 90 89 89 89 88 88 88 88 87 87 87 87 87 86 86 86 86 86 86 86 85 85 85 85 85 85 85 85 85
90 132 131 130 129 128 127 126 125 124 123 122 121 120 119 118 117 117 116 115 114 113 113 112 111 110 109 109 108 107 107 106 105 105 104 103 103 102 101 101 100 100 99 99 98 98 97 96 96 96 95 95 94 94 93 93 92 92 92 91 91 91 90 90 90 89 89 89 89 88 88 88 88 88 87 87 87 87 87 87 86 86 86 86 86 86 86 86 86
91 137 136 135 134 133 132 131 130 129 127 126 125 125 124 123 122 121 120 119 118 117 116 115 115 114 113 112 111 111 110 109 108 108 107 106 105 105 104 103 103 102 102 101 100 100 99 99 98 98 97 97 96 96 95 95 94 94 93 93 93 92 92 91 91 91 90 90 90 90 89 89 89 89 88 88 88 88 88 88 87 87 87 87 87 87 87 87 87
92 143 142 140 139 138 137 136 135 133 132 131 130 129 128 127 126 125 124 123 122 121 120 119 118 117 116 116 115 114 113 112 111 111 110 109 108 108 107 106 105 105 104 103 103 102 101 101 100 100 99 99 98 97 97 96 96 96 95 95 94 94 93 93 93 92 92 92 91 91 91 90 90 90 90 89 89 89 89 89 88 88 88 88 88 88 88 88 88
93 149 147 146 145 144 142 141 140 139 137 136 135 134 133 132 130 129 128 127 126 125 124 123 122 121 120 119 118 117 116 116 115 114 113 112 111 110 110 109 108 107 107 106 105 105 104 103 103 102 101 101 100 100 99 98 98 97 97 96 96 95 95 95 94 94 93 93 93 92 92 92 91 91 91 91 90 90 90 90 89 89 89 89 89 89 89 89 89
94 155 153 152 151 149 148 147 145 144 143 141 140 139 138 136 135 134 133 132 131 129 128 127 126 125 124 123 122 121 120 119 118 117 116 115 114 114 113 112 111 110 109 109 108 107 106 106 105 104 104 103 102 102 101 100 100 99 99 98 98 97 97 96 96 95 95 94 94 94 93 93 93 92 92 92 91 91 91 91 91 90 90 90 90 90 90 90 89
95 161 160 158 157 155 154 152 151 149 148 147 145 144 143 141 140 139 137 136 135 134 133 131 130 129 128 127 126 125 124 123 122 121 120 119 118 117 116 115 114 113 112 111 111 110 109 108 107 107 106 105 105 104 103 103 102 101 101 100 100 99 98 98 97 97 96 96 96 95 95 94 94 94 93 93 93 92 92 92 92 91 91 91 91 91 91 91 90
96 168 166 164 163 161 160 158 157 155 154 152 151 149 148 146 145 144 142 141 140 138 137 136 135 133 132 131 130 129 127 126 125 124 123 122 121 120 119 118 117 116 115 114 113 113 112 111 110 109 108 108 107 106 105 105 104 103 103 102 101 101 100 100 99 99 98 98 97 97 96 96 95 95 95 94 94 94 93 93 93 93 92 92 92 92 92 91 91
97 174 172 171 169 167 166 164 162 161 159 158 156 155 153 152 150 149 147 146 144 143 142 140 139 138 136 135 134 133 131 130 129 128 127 126 125 123 122 121 120 119 118 117 116 115 114 114 113 112 111 110 109 109 108 107 106 106 105 104 104 103 102 102 101 100 100 99 99 98 98 97 97 97 96 96 95 95 95 94 94 94 94 93 93 93 93 92 92
98 181 179 177 176 174 172 170 169 167 165 164 162 160 159 157 155 154 152 151 149 148 146 145 144 142 141 140 138 137 136 134 133 132 131 129 128 127 126 125 124 123 122 120 119 118 117 116 116 115 114 113 112 111 110 109 109 108 107 106 106 105 104 104 103 102 102 101 101 100 99 99 98 98 98 97 97 96 96 96 95 95 95 94 94 94 94 93 93
99 188 186 184 182 180 179 177 175 173 171 170 168 166 164 163 161 159 158 156 155 153 151 150 148 147 145 144 143 141 140 138 137 136 135 133 132 131 130 128 127 126 125 124 123 122 120 119 118 117 116 115 115 114 113 112 111 110 109 109 108 107 106 106 105 104 104 103 102 102 101 101 100 100 99 99 98 98 97 97 97 96 96 96 95 95 95 95 94
100 195 193 191 189 187 185 183 181 179 178 176 174 172 170 168 167 165 163 162 160 158 157 155 153 152 150 149 147 146 144 143 141 140 139 137 136 135 133 132 131 129 128 127 126 125 124 123 121 120 119 118 117 116 115 114 114 113 112 111 110 109 108 108 107 106 106 105 104 104 103 102 102 101 101 100 100 99 99 98 98 97 97 97 96 96 96 96 95
