January to March: Exterior Repairs and Painting The cooler, drier months from January through March offer the best conditions for exterior work . Low humidity and stable temperatures help paint cure properly, reduce mold growth, and increase durability. This is the ideal window for: Painting and stucco repair to prevent moisture intrusion and sun damage Wood rot and siding repair , especially fascia, soffits, and trim Drainage improvements , such as clearing gutters and corr