FrostGuard

From the App Store Source

Designed by a UK firefighter, this app is useful for those who need a quick and safe start to the day, or for those who simply know when the frost is coming! What it does: Shows a simple frost-risk rating based on your location, prompting you to either cover your windscreen or not. For gardeners, cover your plants! Notifications daily with a heads up on forecast. Widgets - add frostguard to your home or lock screen for quick access! Uses temperature, humidity/dew point, wind & cloud cover to predict glass frost formation. Daily notifications to give you a heads-up to cover and protect your windscreen if need be. Updates quickly when you open the app or pull to refresh. Private by design: no account, no ads, no nonsense. How it works: On clear, still nights, glass can cool below the air temperature. FrostGuard estimates cooling and flags when ice is likely—so you know when to cover up the night before. Who it helps: Anyone with a car, motorbike or garden! Emergency responders & shift workers: retained firefighters, ambulance staff, police, carers Rural & on-call professionals: farmers, vets, midwives, trades on early call-outs Transport & fleets: HGV/LGV, delivery drivers, taxi/ride-hail, depots, ground crews Everyday drivers: commuters and school-run parents, gardeners, landscapers Hobbyists: Stargazers and Anglers and cold dippers!

Every number in these answers comes from the data shown above on this page.