African Violets

Heat Index Chart


To use the heat index charts, find the appropriate temperature at the top of the chart. Read down until you are opposite the humidity. The number which appears at the intersection of the temperature and humidity is the heat index.
Heat Index Chart (Temperature & Relative Humidity)

RH
(%)

Temperature (° F)

90

91

92

93

94

95

96

97

98

99

100

101

102

103

104

105

90

119
123
128
132
137
141
146
152
157
163
168
174
180
186
193
199

85

115
119
123
127
132
136
141
145
150
155
161
166
172
178
184
190

80

112
115
119
123
127
131
135
140
144
149
154
159
164
169
175
180

75

109
112
115
119
122
126
130
134
138
143
147
152
156
161
166
171

70

106
109
112
115
118
122
125
129
133
137
141
145
149
154
158
163

65

103
106
108
111
114
117
121
124
127
131
135
139
143
147
151
155

60

100
103
105
108
111
114
116
120
123
126
129
133
136
140
144
148

55

98
100
103
105
107
110
113
115
118
121
124
127
131
134
137
141

50

96
98
100
102
104
107
109
112
114
117
119
122
125
128
131
135

45

94
96
98
100
102
104
106
108
110
113
115
118
120
123
126
129

40

92
94
96
97
99
101
103
105
107
109
111
113
116
118
121
123

35

91
92
94
95
97
98
100
102
104
106
107
109
112
114
116
118

30

89
90
92
93
95
96
98
99
101
102
104
106
108
110
112
114
Note: Exposure to full sunshine can increase HI values by up to 15° F
 
Any value less than 80 is considered comfortable.
Any value greater than 90 is considered extreme.
Any value greater than 100 is considered hazardous.
Any value greater than 110 is considered dangerous.