Wind Chill
and
Heat Index Charts





Wind Chill Chart



Antarctic explorer Paul A. Siple coined the term 'Wind Chill" while exploring the antartic in 1939. During the 1940's He and Charles F. Passel devised the wind chill chart that was in use til november of 2001. This chart was based on the amount of time it took water to freeze in a plastic cylinder while exposed to the elements. This was incorrect because the wind chill figures were inflated and inaccurate as how the wind chill actually felt. This is their chart below.



mph↓
W
35°
30°
25°
20°
15°
10°
5°
0°
-5°
-10°
-15°
-20°
-25°
A
i
r
 
T
e
m
p
e
r
a
t
u
r
e
5
n
32
27
22
16
11
6
0
-5
-10
-15
-21
-26
-31
10
d
22
16
10
3
-3
-9
-15
-22
-27
-34
-40
-46
-52
15
 
16
9
2
-5
-11
-18
-25
-31
-38
-45
-51
-58
-65
20
S
12
4
-3
-10
-17
-24
-31
-39
-46
-53
-60
-67
-74
25
p
8
1
-7
-15
-22
-29
-36
-44
-51
-59
-66
-74
-81
30
e
6
-2
-10
-18
-25
-33
-41
-49
-56
-64
-71
-79
-86
35
e
4
-4
-12
-20
-27
-35
-43
-52
-58
-67
-74
-82
-92
40
d
3
-5
-13
-21
-29
-37
-45
-53
-60
-69
-76
-84
-92

Wind speeds above 40 mph have little additional chilling affect.

According to the old chart.





More Accurate
Wind Chill Chart



The first wind chill chart that was in use has been replaced by a more acurate chart (below) that reflects a more acurate affect on how temperature and wind affect human and animal skin.

** It is important that any pets you have are brought inside when the temperature gets to 20 degrees or lower. The affect of cold temperatures especially if the wind is above 10 MPH could cause frostbite or even death.
 
40°
35°
30°
25°
20°
15°
10°
5°
0°
-5°
-10°
-15°
-20°
-25°
-30°
-35°
-40°
-45°
mph↓
 
 
A
i
r
 
T
e
m
p
e
r
a
t
u
r
e
 
 
5
 
36
31
25
19
13
7
1
-5
-11
-16
-22
-28
-34
-40
-46
-52
-57
-63
10
W
34
27
21
15
9
3
-4
-10
-16
-22
-28
-35
-41
-47
-53
-59
-66
-72
15
i
32
25
19
13
6
0
-7
-13
-19
-26
-32
-39
-45
-51
-58
-64
-71
-77
20
n
30
24
17
11
4
-2
-9
-15
-22
-29
-35
-42
-48
-55
-61
-68
-74
-81
25
d
29
23
16
9
3
-4
-11
-17
-24
-31
-37
-44
-51
-58
-64
-71
-78
-84
30
 
28
22
15
8
1
-5
-12
-19
-26
-33
-39
-46
-46
-53
-60
-73
-80
-87
35
S
28
21
14
7
0
-7
-14
-21
-27
-34
-41
-48
-55
-62
-69
-76
-82
-89
40
p
27
20
13
6
-1
-8
-15
-22
-29
-36
-43
-50
-57
-64
-71
-78
-84
-91
45
e
26
19
12
5
-2
-9
-16
-23
-30
-37
-44
-51
-58
-65
-72
-79
-86
-93
50
e
26
19
12
4
-3
-10
-17
-24
-31
-38
-45
-52
-60
-67
-74
-81
-88
-95
55
d
25
18
11
4
-3
-11
-18
-25
-32
-39
-46
-54
-61
-68
-75
-82
-89
-97
60
 
25
17
10
3
-4
-11
-19
-26
-33
-40
-48
-55
-62
-69
-76
-84
-91
-98







Heat Index



In an effort to alert you to the hazards of prolonged heat/humidity episodes, the National Weather Service devised the "heat index." The heat index (HI) is an accurate measure of how hot it really feels when the affects of humidity are added to high temperature.
 
90°
91°
92°
93°
94°
95°
96°
97°
98°
99°
100°
101°
102°
103°
104°
105°
 
 
A
i
r
 
T
e
m
p
e
r
a
t
u
r
e
 
90%
R
119
123
128
132
137
141
146
152
157
163
168
174
180
186
193
199
85%
e
115
119
123
127
132
136
141
145
150
155
161
166
172
178
184
190
80%
L
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%
H
106
109
112
115
118
122
125
129
133
137
141
145
149
154
158
163
65%
u
103
106
108
111
114
117
121
124
127
131
135
139
143
147
151
155
60%
m
100
103
105
108
111
114
116
120
123
126
129
133
136
140
144
148
55%
i
98
100
103
105
107
110
113
115
118
121
124
127
131
134
137
141
50%
d
96
98
100
102
104
107
109
112
114
117
119
122
125
128
131
135
45%
i
94
96
98
100
102
104
106
108
110
113
115
118
120
123
126
129
40%
t
92
94
96
97
99
101
103
105
107
109
111
113
116
118
121
123
35%
y
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 the Heat Index values by up to 15° F








 
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