Again it's the fact that even in the worst Springs we usually have at least one warm spell that gives us a taste of summer, even if for only a day or two, by May. We have had 0, just fluctuating very slightly around the average which is useless if it's accompanied by cloud and rain. My maximum for the year is 18C, 4C above April average. To show how ridiculous that is, that's the equivalent of maxing out at 12C through all of December and January or 25C through all of June and July. I'd guess the latter 2 have never been done before so yes this "Spring" is unprecented in lack of warm spells.