Hotter/Drier Regime Emerges Gradually in December for Australia
11/25/2025, 5:40 am EST
Early Season Chicago Snowstorm
11/28/2025, 6:20 am EST
Climate Impact Company U.S. Medium Range Report
Issued: Wednesday November 26, 2025
Highlight: Cold pattern arrives; Cold retreat in extended range less aggressive.
Chart of the day: U.S. 6-week HDD forecast…Colder trend.
Discussion: The U.S. gas population weight HDD forecast utilizing all models through the first third of December is shifting colder. The CFS/ECM and AI week 4-6 projections are similar, most notably showing a colder trend for the week ending Jan. 1, 2026. In Chicago, considerable cold weather is ahead!
Medium-range 6-10 Day Forecast Valid December 1-5, 2025 (ECM ENS left and 24-hour change right)
Discussion: The 6-10-day outlook is coldest near Chicago and the Upper Midwest to Ontario although the Southeast U.S. 24-hour change is much cooler.
Medium-range 11-15 Day Forecast Valid December 6-10, 2025 (ECM ENS left and 24-hour change right)
Discussion: The effect of snow cover is revealed in the 24-hour change which is colder across the Midwest U.S. to Ontario. Broad cold weather is indicated across Canada to the northeast quadrant of the U.S. Away from snow cover, warming remains indicated.
U.S. Medium-range Precipitation Forecast
Discussion: The U.S. storm track is persistent into the Southwest U.S. The arc of the (Pacific) storm track suggests that significant warming (south of snow cover) is diminished compared to the operational forecasts. The Southeast U.S. is consistently wet through the medium range. Cold reaches the Interior East causing some snow. The Norther States are very snowy.
Days 16-20 Extended range Temperature Forecast valid December 11-15, 2025
Discussion: The forecast trend is colder northeast quadrant of the U.S. and less stormy.