Frederick County averages roughly 106 days below freezing per year and about 26.3 inches of snow, per the Maryland Department of Commerce, and Maryland summers now produce sustained extreme heat. PJM Interconnection reported an actual regional peak load above 161,000 MW during the June 2025 heat wave, against a forecast of roughly 154,000 MW.
The practical answer for HVAC, plumbing, electrical, and roofing contractors: your visibility has to already be built before those windows arrive. Rankings and review volume compound over months, so February and September are the two most valuable months to start.