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30
WGBT Index and Physical Exercise
WGBT
Flag
Activity
Intensity
< 26.7°C
( < 80°F)
White Normal activity.
Take caution.
26.7 ~ 29.4°C
(80 ~ 84.9°F)
Green Discretion is
required in
planning intense
physical activity.
29.5 ~ 31°C
(85 ~ 87.9°F)
Yellow Intense activity
for new and
non-acclimated
persons should
be curtailed.
31.1 ~ 32.2°C
(88 ~ 89.9°F)
Red
Intense exercise
must be
curtailed for
those with less
than 12 weeks
training in hot
weather. Be on
high alert.
≥ 32.2°C
(≥ 90°F)
Black Cancel all
outdoor
exercise.
