

It depends on the size and type of plants that you have growing on your lawn.
I will assume that you are referring to classic short green grass lawns but here in the UK that is not how we play.
In our garden we have a weed edge and a good covering of wild flowers amongst the grass which is of varying lengths.
Good for wildlife and the environment.





Here in the UK for me at least (and a few others) 10C is shorts weather. There are some postmen who wear shorts all the time even in colder weather though.
Ray Mears stated that you should take care of the top of your body and the legs will take care of themselves in most circumstances.