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Visitors from New York City and Chicago may be accustomed to monthly peak humidity in the 79-86% range. Tourists from New Orleans and Houston see humidity peaking around 84-91% for their most sticky months. Relative humidity in Vegas peaks at 57% in January during the mornings and it is often under 5% in the summer afternoons.
A tourist to Las Vegas who suffered through 50% humidity at 100 degrees back home probably felt as if it were 118.3 degrees. If the humidity is 10% in Vegas, that same 100 degrees will actually feel like 94.8 degrees or about 23.5 degrees cooler.
The heat index chart below shows relative humidity of 0-100% and Fahrenheit temperatures from 80 to 115 degrees across the top. Notice that humidity makes a ridiculous impact at extremes.
At less than 10% humidity, it will always feel a little cooler than the actual temperature. Direct sun can raise the perceived heat level up to 15 degrees.
|
80°
|
85°
|
90°
|
95°
|
100°
|
105°
|
110°
|
115°
|
|
0%
|
77.8 |
82.4 |
86.6 |
90.6 |
94.1 |
97.4 |
100.3 |
102.8 |
|
10%
|
78.1 |
81.9 |
85.9 |
90.2 |
94.8 |
99.6 |
104.6 |
110.0 |
|
20%
|
78.6 |
82.0 |
86.3 |
91.5 |
97.5 |
104.3 |
112.0 |
120.5 |
|
30%
|
79.2 |
82.9 |
87.9 |
94.4 |
102.3 |
111.6 |
122.3 |
134.5 |
|
40%
|
79.9 |
84.3 |
90.7 |
99.0 |
109.3 |
121.5 |
135.7 |
151.8 |
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50%
|
80.8 |
86.5 |
94.6 |
105.2 |
118.3 |
133.9 |
152.0 |
172.5 |
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60%
|
81.8 |
89.3 |
99.7 |
113.1 |
129.5 |
148.9 |
171.2 |
196.6 |
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70%
|
83.0 |
92.7 |
105.9 |
122.6 |
142.8 |
166.4 |
193.5 |
224.1 |
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80%
|
84.2 |
96.8 |
113.3 |
133.8 |
158.2 |
186.5 |
218.8 |
255.0 |
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90%
|
85.6 |
101.6 |
121.9 |
146.6 |
175.7 |
209.2 |
247.0 |
289.2 |
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100%
|
87.2 |
107.0 |
131.6 |
161.1 |
195.3 |
234.4 |
278.2 |
326.9 |
   
  
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