Mount Monadnock, NH

Today’s Forecast:

Today’s Report:

About Mount Monadnock

Mount Monadnock is southern New Hampshire’s defining summit hike, with multiple approaches, exposed rock, state-park facilities, camping, and broad regional views.

Make the Most of a Mount Monadnock Day

Reserve or confirm parking requirements when applicable and start early. Summit wind, lightning, wet slabs, ice, heat, and crowds can make the upper mountain substantially harder than the trailhead suggests.

Weather Tips for Mount Monadnock

• Compare valley and higher-elevation forecasts; temperature, wind, cloud, and precipitation can change sharply with elevation.
• If thunder is possible, finish exposed summits, overlooks, ridges, and event grounds early and keep shelter close.
• Check overnight lows, wet ground, drainage, and the nearest substantial shelter before settling into camp.
• Spring mud, summer bugs, fall crowds, and winter ice can affect access even on a mild day.

Nearby Towns and Areas

This page can also be useful when planning outdoor time near:

• Jaffrey
• Dublin
• Gilson Pond Campground
• Old Toll Road
• Marlborough
• Peterborough
• Monadnock–Sunapee Greenway

Plan Around the Conditions

Use the forecast to choose the best version of a Mount Monadnock day. Match elevation, wind, storms, water conditions, trail surfaces, road access, temperature, and daylight to the activity that gives your group the safest and most comfortable plan.

7-Day Forecast for Mount Monadnock

Mount Monadnock Weather by Season

Winter

Winter at Mount Monadnock brings snow, ice, wind chill, short daylight, and changing road access. Summit and notch conditions may be severe while nearby valleys remain manageable; traction and conservative turnaround times matter. Check current facility and road status before departure.

Spring

Spring around Mount Monadnock is mud season, with snowmelt, soft trails, lingering high-elevation ice, and rising waterways. Avoid widening trails by walking around deep mud. Black flies often become noticeable from late spring into early summer.

Summer

Summer at Mount Monadnock brings the warmest weather, humidity, mosquitoes, and afternoon thunderstorm potential. Early starts reduce heat and give exposed routes more margin before storms. Higher elevations can still be cold, windy, or foggy.

Fall

Fall is a popular season at Mount Monadnock, with cooler air, changing foliage, and generally comfortable outdoor conditions. Parking, traffic, and trail congestion can peak on foliage weekends. Cold nights, early ice, and rapidly shortening daylight return late in the season.

Key Climate Data Points

• Annual average temperature: generally around 42–46°F near surrounding trail towns, based on the relevant summit or surrounding regional context.
• Annual snowfall: commonly 60–100 inches, with higher totals on upper slopes; elevation and year-to-year storm tracks cause substantial variation.
• Warmest months: July and August are normally warmest, although high terrain and water exposure stay cooler.
• Coolest months: January and February are typically coldest, with wind chill often more important than temperature alone.
• Wettest season: late spring and summer bring frequent rain and thunderstorms.
• Driest season: winter is driest by rainfall but snow and ice persist.
• Best outdoor window: late May through early October for hiking, camping, and lake alternatives.