Being a 'bushie' from way back, I'm aware of that - my thermometer hangs in the shade of a fir tree in our garden....
I must admit that I've never understood why official temperatures have to be recorded in the shade. At the risk of raising your ire over Union activity, many years ago I was involved in a Union dispute with the Qld Government, not over pay I hasten to add, but over working conditions. Working in the bush in summer exposed us to regular temperatures of between 110-120F at the hottest part of the day. We wanted to alter our daily starting time to 5am, and work through until noon without a break, so that we could avoid the afternoon heat - and we took temperature readings twice a day, every day for a fortnight in order to highlight the problem. The HR department denied our request, countering it with 'official Met Office data' which showed that the daily temperatures during that period had shown 'only' 95F peaks, with said data having been taken in the shade of a verandah. They were less than impressed when we asked "in that case, could we be issued with personal verandahs?"....