The Lingo biosensor has an operating temperature of 10°C to 45°C (50°F to 113°F). If you use it outside this range, you’ll see messages that say “biosensor too hot” or “biosensor too cold”:
Biosensors may not transmit data outside of their operating temperature range. When operating temperature range is restored, biosensors should function normally within about 15 minutes and will load any missing data.