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Yankton, South Dakota, situated in the southeastern part of the state, experiences a continental climate, with cold, dry winters and warm, more humid summers. Rainfall is a key component of Yankton’s climate, contributing to the area’s agriculture and natural landscapes.
On average, Yankton receives around 27 inches of precipitation annually, which is somewhat less than the United States average of about 38 inches. The distribution of rainfall throughout the year is relatively uniform, but the late spring and summer months tend to be slightly wetter, aligning with the typical pattern for the region, where convectional thunderstorms are common during these periods.
May is often the wettest month, with an average of about 4 inches of rain, whereas the winter months see much less precipitation, in part because much of it falls as snow. The transitional seasons, spring and fall, are also characterized by significant rainfall, which is essential for the planting and harvesting periods in the area’s agricultural calendar.
The rainfall patterns also affect the local river systems, particularly the Missouri River, which flows along the edge of Yankton. Spring and early summer rains can contribute to higher water levels and sometimes flooding, impacting both the environment and human activities. Thus, understanding and preparing for the distribution of rainfall is an essential aspect of life in Yankton.