Britons should brace themselves for more unexpectedly cold weather, as the temperature is set to fall to just 3C by the end of June. Summer officially begins in less than a week, and after the UK experienced the warmest May on record, many would be expecting June to follow suit. However, those expecting to change into their summer wardrobe soon will likely be disappointed, as forecasters have predicted that the mercury will drop before the month is up. In their model for June 29, WXCharts has forecast that the temperature will fall to 3C in Newcastle. Those in Aberdeen and Inverness will also …