The average annual precipitation is . On average, precipitation falls on 60 days each year in Sacramento, and nearly all of this falls during the winter months. Average January rainfall is , and measurable precipitation is rare during the summer months. In February 1992, Sacramento had 16 consecutive days of rain, resulting in an accumulation of for the period. On rare occasions, monsoonal moisture surges from the Desert Southwest can bring upper-level moisture to the Sacramento region, leading to increased summer cloudiness, humidity, and even light showers and thunderstorms. Monsoon clouds do occur, usually during late July through early September. Sacramento is the second most flood susceptible city in the United States after New Orleans.