Verses with the word summer in the New Testament (3 verses):

Matthew 24:32
Now learn a parable of the fig tree; When his branch is yet tender, and putteth forth leaves, ye know that summer is nigh:

Mark 13:28
Now learn a parable of the fig tree; When her branch is yet tender, and putteth forth leaves, ye know that summer is near:

Luke 21:30
When they now shoot forth, ye see and know of your own selves that summer is now nigh at hand.