This may be the least noticeable bug on the iPhone.
It was first discovered by Gui Rambo. Simply put, when you use Fahrenheit temperature, the weather app pre-installed on the iPhone cannot correctly display 69°. Instead, it will display 68° or 70°.
Although it does not seem to have a big impact, people are curious about the reasons behind it. It is understood that iOS 14.6 and some earlier versions have this problem. New versions such as iOS 15 Beta 2 can be displayed correctly, and earlier versions such as iOS 11.2.1 can also be displayed.
Left: iOS 14.6, Right: iOS 15 Beta 2
The outside world has several analytical opinions on this:
1. A former Apple developer, Joo Pavo, judged that this may be related to the conversion between Celsius and Fahrenheit, because 69°F=20.5555555°C, the weather app uses Celsius to calculate the temperature, and Fahrenheit is converted. According to this theory, 65°F should also have bugs, because 18°C=64.4°F and 19°C=66.2°F.
2. Apple’s deliberate humor. What’s interesting is that 69°F can’t be displayed correctly only in the weather app. It’s normal to jump to the Weather website that provides weather data. In addition, Apple’s other weather APP, Dark Sky, can also display 69° correctly.
Source of information