I would say that I live in a microclimate as I live near the coast, my garden is south facing and sheltered. The top half of my garden rarely gets any frost (though the area where my GH is does and quite often). It is often a good few C warmer than the weather forecasts say at the top of my garden nearest the house (lots of sunny brick walls to retain heat). In winter I can see the frost/snow less than a mile or so away on either side and smile that it is not me .
The problem with microclimates is everyone seems to think that they are in one! Every other gardener says that their garden is not as cold as X Y miles away and etc...surely we cannot all have a microclimate? This is not just a UK thing, I know gardeners all over the EU and US that say the same thing - and quite adamant of it.
What do you think?
I think microclimates only make a difference in 'normal weather' . There is very little difference when weather like 2010 happens as when it gets to -5C and below or we have heavy snow, then we all get damage, though it may fade faster is 'microclimates'