The absence of 69 degrees in the Apple Weather app is caused by the app sourcing data in Celsius and converting it to Fahrenheit, which results in specific values being skipped.

“turns out the reason is most likely explained by where they source their data and how they source their data yeah so a lot of people are asking well where are you uh finding that it's 69 versus 68 maybe it's a discrepancy in the sourcing it's a weather channel is where now they bought dark sky”