For LEL 2013 my only memories of the weather were
1) a good tailwind on the first day.
2) getting a good soaking (but the rain felt warm so not really unpleasant) southbound between Thirsk and Pocklington (Wed evening) before it gradually drying up on the way to the Humber bridge.
3) This was followed by a slight disbelief when reaching Market Rasen that there was a heat wave (30C) on the way for the next day (Thursday) and there would be a strong headwind to contend with. A combination that to be honest I'd been dreading - I'm quite light and let's face it no UK based rider is accustomed to that heat
This turned out to be true and it was indeed a tough day heading south - made easier though by being in a group of 4 all with similar ability and able to share the workload on the front.
Other than that I'd describe the weather for LEL 2013 as pretty benign.
I didn't ride this years event but one of those who I rode with in 2013 did so again this year. He has described the weather conditions as tougher this year than 2013
So out of interest I had a look at the data for Thurs 2013 and Thurs 2017 in the Spalding area (actually data from Holbeach) for a comparison.
Spalding area 2013Spalding area 2017The wind speed data towards the bottom of each page suggests that while that day in 2013 was tough, the corresponding day in 2017 was in another league of difficulty.
From what I can gather there was more wind and rain around for the other days as well.