Winter Storms risk in New Hampshire

Winter storms in New Hampshire: what makes this state so exposed

New Hampshire sits directly in the path of nor'easters — large coastal storms that pull moisture off the Atlantic Ocean and collide it with cold air flowing down from Canada. That combination produces some of the heaviest snow, sleet and freezing rain in the Northeast. The state is rated at the highest level (5 of 5) for winter storm risk, and the National Weather Service treats winter weather as one of the most common and disruptive hazards in this region.

Winter weather can arrive as early as October and linger into April, with the core of the season running from December through March. Not every storm delivers snow: freezing rain and sleet are common in the interior, where cold air gets trapped against the terrain while milder air rides over it. A single system can bring different hazards to different parts of New Hampshire within a few hours.

Geography drives the risk

• White Mountains and the North Country (Coos, Grafton and Carroll counties): The highest elevations and northern interior see the most snow and the coldest temperatures. Mount Washington, the Northeast's highest peak, is well known for extreme wind, cold and snowfall.
• Interior valleys and the Monadnock region: Sheltered valleys can hold cold air longer, favoring freezing rain and ice storms that coat trees, roads and power lines.
• Central New Hampshire and the Lakes Region: Storms here often bring heavy, wet snow that is especially hard on trees and utility lines, along with mixed precipitation as temperatures hover near freezing.
• Seacoast (Rockingham and Strafford counties): Warmer ocean air often means a rain, sleet and snow mix, plus strong winds, coastal flooding and beach erosion during powerful storms.

The result is a hazard that looks different depending on where you live, but affects virtually every community in New Hampshire each winter.

How it affects homes

Winter storms damage New Hampshire homes in several predictable ways:

• Roof snow load: Accumulated snow and ice add weight to roofs. Older homes, low-slope roofs and roofs with existing damage are most vulnerable. Building codes in northern New Hampshire account for higher ground snow loads than in southern parts of the state.
• Ice dams: Heat escaping through the attic melts snow on the roof, which refreezes at the colder eaves. Water backs up under shingles and into ceilings, walls and insulation.
• Frozen and burst pipes: Pipes in exterior walls, crawlspaces, garages and unheated basements are at risk, especially during power outages.
• Wind and falling debris: Nor'easters and ice storms bring down limbs and whole trees onto roofs, siding, vehicles and power lines.
• Water intrusion: Snowmelt and rain-on-snow can overwhelm gutters, saturate the ground and push water into basements.

Insurance considerations: Most standard homeowners policies in New Hampshire generally cover sudden damage such as wind damage, damage caused by the weight of ice or snow, and damage from a falling tree. What they typically do not cover is flooding — including water that enters from outside during snowmelt — so homeowners in low-lying areas often need separate coverage through the National Flood Insurance Program. Policies also generally do not pay to prevent damage, so maintenance like roof repair or pipe insulation is out of pocket. Document damage with photos, note the storm date and contact your insurer promptly.

How to prepare your home

1. Prepare the roof before the season. Repair loose shingles, clear gutters and downspouts, and trim overhanging branches.
2. Prevent ice dams. Seal air leaks and improve attic insulation and ventilation so the roof deck stays cold. After a storm, use a roof rake from the ground to clear the first few feet of snow at the eaves — never climb onto a snowy roof.
3. Protect pipes. Insulate pipes in unheated spaces, seal gaps where cold air enters, disconnect garden hoses, and shut off and drain exterior faucets. Know where your main water shutoff is.
4. Service heating systems. Have furnaces, boilers and chimneys inspected annually and replace filters. Never run a generator, grill or camp stove indoors or in a garage.
5. Install and test safety devices. Carbon monoxide and smoke alarms on every level, plus a working flashlight on each floor.
6. Build an emergency kit. At least three days of water, non-perishable food, medications, batteries, phone chargers, blankets and a battery-powered or hand-crank radio.
7. Plan for outages. Keep a generator for outdoor use only, extra fuel, a safe alternative heat source, and a plan to keep pipes from freezing.
8. Keep vents clear. After snowfall, clear furnace, dryer and exhaust vents — blocked vents are a carbon monoxide hazard.
9. Review your coverage. Check what your policy covers and consider flood insurance if snowmelt or heavy rain has ever threatened your property.

Frequently asked questions

When is winter storm season in New Hampshire?

Snow and ice can occur from October through April across much of the state, with the heaviest and most frequent snow between December and March. The White Mountains and North Country typically see snow earlier in the fall and later in the spring than southern and coastal areas.

Does homeowners insurance cover winter storm damage in New Hampshire?

Policies vary, but most standard homeowners coverage generally responds to wind damage, damage from the weight of ice or snow, falling objects and, in many cases, burst pipes. Flooding from snowmelt or heavy rain is typically excluded and requires a separate flood policy. Review your policy or speak with your agent before winter begins.

What should I do if a winter storm knocks out power to my home?

Focus on safety first: use flashlights instead of candles, keep generators outdoors, and never use a gas stove or grill for heat. If temperatures drop, help prevent frozen pipes by opening cabinet doors, letting faucets drip and using a safe heat source. If you must leave, shut off the water and check on elderly or vulnerable neighbors.

Official resources

• New Hampshire Homeland Security and Emergency Management — state preparedness, alerts and emergency information.
• National Weather Service — Winter Weather Safety — forecasts, warnings and storm safety guidance.
• Ready.gov — Winter Weather — federal guidance on preparing for and responding to winter storms.
• CDC — Winter Weather — health and safety information, including cold-related illness and carbon monoxide risks.