Every year around this time, thousands of humpback whales arrive in Hawaiian waters. However, this time around, only a relative handful have gotten there on schedule.

Every year around this time, thousands of humpback whales arrive in Hawaiian waters, spurring a frenzy of related activities by tourists and locals alike. 
According to Ed Lyman from Hawaiian Islands Humpback Whales National Marine Sanctuary, this time around, only a relative handful have gotten there on schedule.
Experts are not entirely sure why the remainder are experiencing delays, but do have a couple of theories. 
One is that El Niño has affected water