I remember it clearly because my flight to Greece was cancelled the night of the cold front. And since the flight was cancelled late, like near midnight even though it was supposed to depart around 6PM, as we were driving home to depart again the next day, the cold front had already come through and there was a very strong, cool, dry wind outside. Very impressive CAA for that time of year.
I just looked it up actually and it was mid 50s not low 50s.
There was another year where I can remember the low being 53 degrees I think.