Memphis rises on the high Chickasaw Bluffs along the east bank of the Mississippi River. UT Extension reports that brown recluse spiders are far more common in the western half of Tennessee, so Shelby County sits in the heart of their range.
Memphis counted 633,104 residents in the 2020 census and stands at about 338 feet above sea level. Downtown rises from a bluff over the Mississippi, and the Chickasaw Bluffs gave the city natural protection from river floods. The Wolf River drains a large part of the city and northern Shelby County before it joins the Mississippi just north of downtown, near Mud Island.
The weather is humid and warm: July averages 82.8 degrees, January 42.1, and about 54.9 inches of precipitation fall in a year, with just 2.7 inches of snow. Ice storms and severe thunderstorms are regular visitors. That wet, warm cycle, plus sheltered storage space in older buildings and thousands of acres of parkland such as Shelby Farms, keeps insects and spiders active for most of the year.