Yeah, for such a low mountain range they can have a marked effect on weather. The current very wet west and much drier east, summer weather with a wind off the North sea and cloudy cool and damp at home, becomes sunny and hot at the bottom of Hartside pass. On such day's temps could be no more than 15 at home but once west of the pennines 25-30!! Haven't had much time to view radar re this months rain but on many occasions in the past daily radar images show a stark contrast between west and east of Pennines. I always presumed Consett was wetter than my hometown but I'm very surprised at the actual difference this month between myself and peterf, 126mm compared to my now 20.1mm!! Consett is some 16 miles from Chester-le-street.