Did you know you can determine the air temperature just by listening to crickets chirp?
Pull out your device and tap along to the chirping. In just a few seconds you'll have an accurate estimate of the air temperature. The longer you tap, the more accurate it becomes.
It also supports a red-on-black Night Mode, so your eyes can stay adjusted to the dark.
What's new (v1.0)
This update from Apple will improve the functionality of this app. No new features are included.