U.S. CDD Forecast Reverses Below Normal Electricity Demand Next Week to Above Normal Following Week

Climate Impact Company U.S. Medium Range Report

Issued: Tuesday May 26, 2026

Highlight: North-central warmth days 6-10 broadens into the Northeast days 11-15.

Charts of the day: Latest CDD and NAO forecast.

Discussion: The U.S. population weight CDD forecast induicates much below normal electricity demand for next week ahile June 5-11 reverses to above normal demand due to warming in the Northeast U.S. supported by a positive phase of the North Atlantic oscillation.

Medium-range 6-10 Day Forecast Valid May 31-June 4, 2026 (AIFS ENS and 24-hour change)

Discussion: High pressure ridge keeps central continent very warm to hot (and dry) while an elongated trough cools the Mid-Atlantic southwestward to Texas.

Medium-range 11-15 Day Forecast Valid June 5-9, 2026 (AIFS ENS and 24-hour change)

Discussion: +NAO regime pushes the warmth eastward and into the Northeast in the 11-15-day period.

U.S. Medium-range Precipitation Forecast

Discussion: Wet weather in the Gulf States persists throughout the medium range. The offshore heavy rain raises concern about an early season “hybrid” subtropical system. The Midwest stays dry as soil moisture steadily reduces.

Days 16-20 Extended range Temperature Forecast valid June 10-14, 2026

Discussion: A comparison between broad anomalous warmth across the Northern U.S. forecast by ECM and the consolidation of warmth in the Northwest by Graph Cast (while the East is wetter/cooler).