15C-25C, that’s fairly mild. Add 32 to that, the freeezing point of water,0-C and you have the Fahrenheit temperature- 47-58. Does it get below freezing where your at and would that be unusual ?
It sometimes gets close to freezing, like 4C ... in aviation we’ve been dealing with centigrade rather than Fahrenheit for a while ...I have no problems with C vs F ....if it gets below freezing yes, it would be a bit unusual ....