N.H. Rev. Stat. § 231:92-a
Notwithstanding RSA 231:90-92, a municipality or school district shall not be held liable for damages arising from insufficiencies or hazards on public highways, bridges, or sidewalks, even if it has actual notice or knowledge of them, when such hazards are caused solely by snow, ice, or other inclement weather, and the municipality's or school district's failure or delay in removing or mitigating such hazards is the result of its implementation, absent gross negligence or reckless disregard of the hazard, of a winter or inclement weather maintenance policy or set of priorities adopted in good faith by the officials responsible for such policy; and all municipal or school district employees and officials shall be presumed to be acting pursuant to such a policy or set of priorities, in the absence of proof to the contrary.
RSA 231:92-a
1991, 385:6. 1998, 249:2, eff. Jan. 1, 1999.