# Reading the stress bands · SunScope
How SunScope maps every SunSoak felt-temperature value to a colour-coded thermal stress band — from Polar cold through Comfortable to Extreme heat — so you can read conditions at a glance.

# 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.