I remember averaging out the Leeds Weather Centre data and it was warmer in the summer than Church Fenton, both maxes and mins, and of course was much milder at night in winter especially. Leeds' record high temp is 34.4C in August 1990. I think only the Bawtry September record is higher in Yorkshire.
If Leeds Weather Centre still open then Leeds would probably be one of the warmest cities on that list.
Whitkirk, Leeds - 85m ASL.