The foggiest months are December and January. Tule fog can be extremely dense, lowering visibility to less than and making driving conditions extremely hazardous. Chilling tule fog events have been known to last for several consecutive days or weeks. During Tule fog events, temperatures do not exceed . thumb|A market at César Chávez Plaza Snowfall is rare in Sacramento, which is only above sea level. In the downtown area, only three significant snow accumulations have occurred since 1900, the last one being in 1976. During especially cold winter and spring storms, intense showers do occasionally produce a significant amount of hail, which can create hazardous driving conditions. Snowfall in the city often melts upon ground contact, with traceable amounts occurring in some years. Significant annual snow accumulations occur in the foothills east of the city, which had brief and traceable amounts of snowfall in January 2002, December 2009, and February 2011."Arctic Blast Could Bring Dusting Of Snow To Sacramento Valley and Several Feet To Sierra" CBS Sacramento The greatest snowfall ever recorded in Sacramento was on January 5, 1888. On average, there are 76 days with a high of +, and 14 days with a high of +; On the other extreme, there are 8.5 days where the temperature remains below , and 15 freezing nights per year. Official temperature extremes range from on December 22, 1990, to on September 6, 2022; a station around east-southeast of the city dipped to on December 11, 1932. thumb|right|View of Downtown Sacramento The average annual precipitation is . On average, precipitation falls on 58 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 June through early September. Sacramento is the second most flood-susceptible city in the United States after New Orleans.
the foggiest months are december and january tule fog can be extremely dense lowering visibility to less than and making driving conditions extremely hazardous chilling tule fog events have been known to last for several consecutive days or weeks during tule fog events temperatures do not exceed  thumb|a market at césar chávez plaza snowfall is rare in sacramento which is only above sea level in the downtown area only three significant snow accumulations have occurred since 1900 the last one being in 1976 during especially cold winter and spring storms intense showers do occasionally produce a significant amount of hail which can create hazardous driving conditions snowfall in the city often melts upon ground contact with traceable amounts occurring in some years significant annual snow accumulations occur in the foothills east of the city which had brief and traceable amounts of snowfall in january 2002 december 2009 and february 2011"arctic blast could bring dusting of snow to sacramento valley and several feet to sierra" cbs sacramento the greatest snowfall ever recorded in sacramento was on january 5 1888 on average there are 76 days with a high of + and 14 days with a high of +; on the other extreme there are 85 days where the temperature remains below  and 15 freezing nights per year official temperature extremes range from on december 22 1990 to on september 6 2022; a station around east-southeast of the city dipped to on december 11 1932 thumb|right|view of downtown sacramento the average annual precipitation is  on average precipitation falls on 58 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 june through early september sacramento is the second most flood-susceptible city in the united states after new orleans