Weather along the MSG is typical of southern New Hampshire. Conditions on exposed hill tops and summits may be harsher during cold or stormy weather. Weather atop the exposed and isolated summit of Mount Monadnock can be much more severe than conditions below; high winds are common year round and winter storms on the summit can be life-threatening. Lightning is a hazard on exposed peaks and ledges during thunderstorms. Snow is common in the winter and may necessitate the use of cross country skis or snowshoes. Ice can form on exposed ledges and summits, making hiking dangerous without special equipment. Snow and ice tend to linger on Mount Monadnock well into the spring.