During the past few weeks, sea-surface temperatures across the central and eastern Equatorial Pacific Ocean have showed signs of warming. This indicates that the expected weakening trend of the La Nina phase has begun. The latest long-range climate models continue to suggest that this La Nina will weaken further and transition into a neutral phase during the summer season.
As for the June temperature outlook, slightly above normal temperatures are forecast across portions of the Desert Southwest, southern Rockies, and west Texas with a monthly surplus of cooling degree days of between 20 and 60 expected across these regions. Parts of the Southeast and New England may also see temperatures average slightly above normal in June with somewhat higher energy costs with respect to cooling possible in these areas as well.
Much of the Great Lakes, Midwest, Mid-Atlantic, central Plains, north-central Rockies, and Pacific Northwest will likely see temperatures that on a whole are closer to average for the month of June. It is possible that parts of the northern Plains may see slightly below normal temperatures with a small deficit in early season cooling degrees days.