New York City experiences a full range of seasons—from humid summers to freezing winters. While this diversity in weather adds to the city’s charm, it also creates ideal conditions for mold growth inside homes and buildings. At Crown Mold Specialists, we often see spikes in mold problems that align with the changing seasons.
Understanding how seasonal weather affects indoor mold growth can help you prevent issues before they start. Here’s what NYC homeowners and property managers need to know.
Spring: moisture and mold awakening
Spring in NYC brings warmer temperatures and lots of rain. That combination increases indoor humidity, especially in basements and older buildings. It also marks the beginning of mold season, as spores that were dormant in winter become active again.
What to watch for:
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Leaks from heavy rain
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Condensation on windows and walls
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Damp basements or crawl spaces
Prevention tip:
Use dehumidifiers and check your home for any new water intrusion after storms.
Summer: peak humidity and ventilation issues
Summer in New York is hot and humid. Without proper airflow, moisture builds up quickly inside homes, particularly in bathrooms, kitchens, and apartments with limited ventilation. Mold thrives in these conditions.
What to watch for:
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Mold growth on ceilings and walls
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Musty smells in closets or cabinets
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Visible spores near A/C vents
Prevention tip:
Ensure air conditioners and fans are functioning properly and vents aren’t blocked.
Fall: temperature shifts and hidden moisture
As temperatures cool down and heating systems begin running, condensation can form on cold surfaces inside the home. This trapped moisture—especially in poorly insulated buildings—creates the perfect environment for mold to grow in hidden areas.
What to watch for:
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Window condensation
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Mold around radiators or behind furniture
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Moisture buildup in attics or between walls
Prevention tip:
Keep rooms well-ventilated and check behind large furniture placed against exterior walls.
Winter: dry indoors, but hidden risks remain
While indoor air is generally drier in the winter due to heating systems, leaks from snow, ice dams on roofs, or burst pipes can lead to serious mold issues. Many NYC residents let their guard down during this season, only to discover mold damage later.
What to watch for:
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Water stains on ceilings or walls
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Leaks from poorly insulated plumbing
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Mold in heating ducts
Prevention tip:
Inspect roofs and pipes regularly, especially after snowstorms or freezing temperatures.
Final thoughts
Mold doesn’t take a season off. In fact, each part of the year in NYC brings unique risks that can contribute to indoor mold growth. Staying informed and proactive is key.
At Crown Mold Specialists, we help homeowners across all five boroughs prevent and eliminate mold year-round. Contact us today for an inspection or professional advice on mold prevention strategies for your home.