This lecture covers snowfall records, including the most snow in a 12-month period, winter, and calendar month. It also discusses humidity, air cooling, lifting mechanisms, crystal formation, and the composition of the atmosphere. The properties of air and water vapor, vapor pressure, saturation vapor pressure, the water molecule, ice crystal structure, vapor transport mechanisms, cloud and precipitation formation, lapse rates, orographic and frontal lifting, convergence, divergence, localized convection, and convective lifting are explained.