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Jennings is located in Saint Louis County, Missouri. There are roughly 16,840 residents, living in 6,571 households. The average temperature for Jennings this time of the year is low of 64F and high of 85F. On average, Jennings gets about 3.78 inches of precipitation in June. Most residents are home owners (52%), have a high school diploma (56%) and are single, no kids (50%).