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Page 25
Figure 25
The US EPA defines the UVI as follows:
UVI
Rating
Comments
0-2
Low
A UV Index reading of 0 to 2 means low danger from the sun's UV rays
for the average person.
3-5
Medium
A UV Index reading of 3 to 5 means moderate risk of harm from
unprotected sun exposure.
6-7
High
A UV Index reading of 6 to 7 means high risk of harm from unprotected
sun exposure. Protection against skin and eye damage is needed.
8-10
Very High
A UV Index reading of 8 to 10 means very high risk of harm from
unprotected sun exposure. Take extra precautions because unprotected
skin and eyes will be damaged and can burn quickly.
11-16
Extreme
A UV Index reading of 11 or more means extreme risk of harm from
unprotected sun exposure. Take all precautions because unprotected skin
and eyes can burn in minutes.
Figure 26
5.12.2
Wind Chill
Wind Chill is the perceived decrease in air temperature felt by the body on exposed skin due to the
flow of air and is calculated based on temperature and wind speed.
Wind chill numbers are always lower than the air temperature for values where the formula is valid.
The wind chill calculation is only valid for temperatures less than 40 °F and wind speeds greater than
0 mph, according to the National Weather Service.
5.12.3
Heat Index
Heat Index is an index that combines air temperature and relative humidity, as an attempt to determine
the human-perceived equivalent temperature.
The heat index calculation is only valid for temperatures greater than 80 °F and less than 120 °F, and
humidity greater than 40%, according to the National Weather Service. If it is below 80 °F, the console
will display Lo.
Level
Heat Index
Range (°F)
Notes
Caution
80-90
Fatigue is possible with prolonged exposure and activity.
