Are cities generally warmer than the more...

Yes. In the biggest cities, the temperature can be 18 degrees Fahrenheit higher than it would be if that land were undeveloped. Industrial manufacturing and air-conditioning actually create heat, plus the big buildings and roads absorb a lot of sunlight and store it efficiently. This causes the air to rise more over cities, which increases cloud formation, which in turn produces more rain and heavier thunderstorms. So if you live in a big city, your chances of experiencing thunderstorms also are greater than in the surrounding countryside. Looking on the bright side, all that city heat can create microclimates for urban gardeners, who sometimes can produce more heat-sensitive crops than gardeners in surrounding rural areas.