limits of Roanoke. The Roanoke River flows through the city of Roanoke. Some stretches of the river flow through parks and natural settings, while others flow through industrial areas. Several tributaries join the river in the city, most notably Peters Creek, Tinker Creek and Mud Lick Creek. Neighborhoods Within its boundaries, Roanoke is divided into 49 individually defined neighborhoods. Climate Though located along the Blue Ridge Mountains at elevations exceeding , Roanoke lies in the humid subtropical climate zone (Köppen Cfa), with four distinct, but generally mild, seasons; it is located in USDA hardiness zone 7b, with the suburbs falling in zone 7a. Extremes in temperature have ranged from as recently as August 21, 1983, down to on December 30, 1917, though neither nor is reached in most years; the most recent occurrence of each is July 8, 2012 and February 20, 2015. More typically, the area records an average of 6.1 days where the temperature stays at or below freezing and 30.5 days with + highs annually. The normal monthly mean temperature ranges from in January to in July. Based on the 1991−2020 period, the city averages of snow per winter. Roanoke experienced something of a snow drought in the 2000s until December 2009 when of snow fell on Roanoke in a single storm. Winter snowfall has ranged from trace amounts in 2022-2023 to in 1959–60; unofficially, the largest single storm dumped approximately three feet (0.9 m) from December 16−18, 1890. Flooding is the primary weather-related hazard faced by Roanoke. Heavy rains, most frequently from remnants of a hurricane, drain from surrounding areas to the narrow Roanoke Valley. The most recent significant flood was in the fall of 2004, caused by the remains of Hurricane Ivan. The most severe flooding in the city's history occurred on November 4, 1985, when heavy storms from the remnants of Hurricane Juan stalled over the area. Ten people drowned in the Roanoke Valley and others were saved by rescue personnel. Many residents complain that they are prone to allergies because of pollen from trees in the surrounding mountains. Most famously, the family of Wayne Newton moved from Roanoke to the dry climate of Phoenix, Arizona, because of his childhood asthma and allergies. However, there have not been clinical studies to establish that these conditions are more prevalent in Roanoke than in other cities with similar vegetation and climate. Demographics 2020 census Note: the