Atlanta has a humid subtropical climate: long, hot, humid summers and mild winters with occasional cold snaps. Below: live conditions, the 7-day outlook, and what it means for electricity demand on the Southeast (SERC) grid.
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High and low temperatures, with the implied heating and cooling demand below.
Atlanta is now a top-three North American data-center market, with around two gigawatts under construction. Summer heat and humidity drive a long cooling season across the Southeast, while winter cold snaps can spike heating demand sharply. Southern Company is adding gas and solar to keep up with a build-out that is among the fastest in the country.
The Southeast peaks in summer on cooling load, with secondary winter-morning heating spikes during cold snaps.
See live Southeast (SERC) grid data →They measure how far the day's average temperature sits from a comfortable 65°F. Cooling degree days (CDD) count degrees above 65 and track air-conditioning demand; heating degree days (HDD) count degrees below 65 and track heating demand. More degree days means more energy used to keep buildings comfortable, and a higher grid load.
Temperature is the single biggest short-term driver of electricity demand. Hot afternoons and cold mornings push load toward the grid's limits, which is when prices rise and reliability is tested. Watching the forecast is watching the grid's next few days.
Live weather and the 7-day forecast come from Open-Meteo. Degree days are computed from the forecast highs and lows against a 65°F base. Live grid data is on the Southeast (SERC) region page.