Islanders defenseman Nick Leddy has had dramatic improvement in plus-minus

Islanders defenseman Nick Leddy passes the puck against the Lightning in the first period of a game at Barclays Center on Jan. 13. Photo Credit: Kathleen Malone-Van DykeTemperatures plunged to minus-40 and worse in Nick Leddy’s home state of Minnesota last week, matching a dubious benchmark the defenseman reached on the ice last season with the Islanders.

Plus-minus often is considered a misleading statistic, but Leddy ranked last in the NHL in that defensive rating in 2017-18 at minus-42 as part of the Isles leading the league in goals allowed under since-fired coach Doug Weight.

“I tried to block it out as much as possible, but for me the whole year was very frustrating,” Leddy said after…