Answer: uvindex

AnswerCrossword Clue
UVINDEX

Scale used in summer weather forecasts

UVINDEX

Sunburn-related meas.

UVINDEX

Measure discussed on the EPA's SunWise web page

UVINDEX
Measure of burning potential
UVINDEX
Number for beachgoers
UVINDEXIt drops to 0 after sundown
UVINDEXScale with the highest reading at midday, usually
UVINDEXNumber affected by cloud cover