As the glacier retreated, the south side of Leavenworth was a lake dammed up by the moraine. The bridge on the east side of town is a good vantage point to see where the Wenatchee River cuts through the moraine today. Leavenworth has a continental Mediterranean climate (Köppen "Dsb") with summers characterized by hot, sunny days and chilly nights, and cold, snowy winters. During the summer, the weather is typically anticyclonic due to the presence of the North Pacific anticyclone, with resultant clear skies and large diurnal temperature ranges. Rainfall is limited by the Cascade rain shadow as well as by the anticyclone, and all months from May to October have recorded zero precipitation on occasions, including 114 consecutive days without precipitation from June to October 2003. When a continental flow enters the Columbia Basin, temperature can be very hot during the day, with the hottest temperature being during the heatwave of July 1941. However, on cooler, stiller days, summer nights can still be cold and frosts have been recorded as early as August 29 in 1980. The fall months have steady cooling and a gradual increase in the frequency of frontal storms producing rainfall, whilst winter weather is typically cold and snowy, with an annual mean snowfall of and a maximum monthly total of recorded in December 1996. The snowiest season has been from July 1968 to June 1969 with and the least snowy from July 1962 to June 1963 when just of snow fell. The lowest temperature recorded in Leavenworth was on December 30, 1968, but typically five mornings per year will fall at or below . The wettest "rain year" was recorded from July 1955 to June 1956 with a total of and the driest was from July 1929 to June 1930 with . The spring months see gradual warming and drying, though frosts remain frequent into April–over 168 mornings during an average year fall to or below freezing and the average last freeze is on May 16; 2016 was the first year to record a last frost in March. As of the 2010 U.S. Census, there were 1,965 people, 908 households, and 500 families residing in the city. The population density was about . There were 1,241 housing units at an average density of about . The racial makeup of the city was 92.9% White, 0.4% Black, 0.5% Native American, 0.6% Asian, 0.2% Pacific Islander, 3.9% from other races, and 1.6% from two or more races.