Reading the stress bands

Colour-coded comfort, at a glance.

SunScope maps every SunSoak value to a thermal stress band so you can read conditions at a glance. The same colours run through the forecast table and the day strip — blue for cold, green for comfortable, and yellow through red for increasing heat stress.

SunSoak range	Band	What it means outdoors
Below −27 °C	Polar	Survivable only with expedition-grade kit; do not go outside unprepared
−27 to −13 °C	Arctic	Very strong cold stress; full winter protection needed
−13 to 0 °C	Freezing	Strong cold stress; warm layers essential
0 to 9 °C	Cold	Moderate cold stress; coat and gloves advised
9 to 18 °C	Chilled	Slight cold stress; comfortable with a light jacket
18 to 24 °C	Comfortable	No thermal stress; ideal outdoor conditions
24 to 27 °C	Warm	Mild heat stress; still comfortable for most activity
27 to 32 °C	Caution	Avoid strenuous activity or exercise outdoors Drink plenty of fluids Wear light clothing
32 to 41 °C	Extreme	Take frequent breaks and spend time indoors in the air conditioning Avoid strenuous activity or exercise outdoors Drink plenty of fluids Wear light clothing
Above 41 °C	Danger	Limit time spent outdoors Stay indoors with the air conditioning on as much as possible Avoid strenuous activity or exercise outdoors Drink plenty of fluids Wear light clothing

These bands follow the UTCI thermal-stress categories. The SunSoak value they colour is the felt temperature after the rain/snow penalty, Solar Model, and mean radiant temperature are applied — see SunSoak & the science for how that number is built.