Originally Posted by
channa
Obviously that's anecdotal, but I've seen this pattern more than a few times, and the weather can't be significantly different between EWR and JFK.
The weather isn't different, but the runway layout is. EWR doesn't have the crossing runways available the same way JFK does to help out if winds go amok. I also think that the wide spacing between the parallel runways at JFK helps them out a lot.