Here is another little head-scratcher for you to try out right now if you have an iPhone. Whip it out, head over to the weather app, and try to find a location anywhere on the planet that is around 69 degrees Fahrenheit. You'll notice that it will always show either 68 degrees or 70 degrees Fahrenheit, but never 69. Can Apple really be this "anti-meme?"
Well, as it turns out, the Apple weather app also doesn't show 65 degrees or 67 degrees Fahrenheit, so that throws the "meme" factor out of the equation.
The real reason as to why this is, comes down to where and how Apple sources its weather data. They use the National Oceanic and Atmospheric Administration (NOAA), which only supplied data in degrees Celcius. So, if you were to do the calculations, 20 degrees Celcius equates to exactly 68 degrees Fahrenheit, whereas 21 degrees Celcius equates to 69.8 degrees Fahrenheit, which rounds off to 70 degrees Fahrenheit in the Apple Weather App. So there is no place mathematically for a 69 degrees notification when converting from degrees Celcius to degrees Fahrenheit.
Take a look at the video below by the YouTube channel, Waveform Clips, on Why Apple Won't Show You 69 Degrees...