What are the individual and joint impacts of key meteorological factors on the risk of unintentional injuries? A case-crossover study of over 147,800 cases from a sentinel-based surveillance system

•Meteorological factors were significantly associated with unintentional injury.•The excess risk for precipitation and temperature was positive from lag0–1 day onward.•Overall excess risk for relative humidity (RH) was negative from lag0-2 days onward.•Workers, males, and patients injured by falls or with fractures were more vulnerable.•High temperature and wind speed, with low precipitation and RH posed the highest risk.