Today, extreme temperatures constitute the greatest weather-related health risk to the urban populations of US cities – a risk that is steadily rising over time. Despite this risk, most cities measure temperatures at only a handful of locations, most often relying on a nearby airport to represent heat exposures across the entire city. The Urban Climate Lab has constructed dense climate monitoring networks in Atlanta and New Orleans to better understand how heat risk varies within cities and to support heat risk surveillance at the neighborhood level. Daily temperature data for a large network of sensors across the Georgia Tech campus and midtown Atlanta can be downloaded from our Data + Resources page.