SPF30 is like a summer day here so you wear that one in 30°C weather. then you have SPF50 or 45 if you live in a super hot place like Texas or whatever.
i only found out its not because i saw my moisturiser and thought "Do Americans have like SPF100 and SPF85? or are they the same and they just remember by habit?" and then was like Hold On idek if it means the temp in °C
