The short-term heat across the high population northeast quadrant of the U.S. is expected to repeat during summer 2024 and consequently the U.S. population weight CDD forecast has increased again. The JUN/JUL/AUG 2024 projection is 1004 CDD ranking 4th hottest of this century trailing only 2016 (1030), 2010 (1020), and 2011 (1014). 

Expected later this year as an evolving La Nina climate and several global SSTA forecast models are now projecting negative phase of the Indian Ocean dipole. The combination of La Nina and -IOD climate ahead supports a wet pattern in Australia by springtime especially eastern sections.

Once again, Climate Impact Company raises the U.S. population weight CDD forecast for each month of meteorological summer (Fig. 1). The new forecast is the hottest so far and slowly getting closer to the hottest on record this century. Anticipated electricity demand on the U.S. grid is on the increase.

Meteorological spring (MAR/APR/MAY) 2024 was the 10th warmest on record. A record warm spring was observed in Ohio and Pennsylvania. The entire South, East-central, and East U.S. was MUCH ABOVE normal and included the second warmest spring on record for Maine, New Hampshire, Massachusetts, Connecticut, New York, New Jersey, Maryland, Michigan, West Virginia, Virginia, Arkansas, Oklahoma, and Texas.