Yes, it can be chilly in a hot air balloon, but it is rarely as cold as people expect. While air temperature drops by roughly 3.5°F for every 1,000 feet of altitude, most commercial balloon rides stay below 3,000 feet, meaning the temperature difference is only about 10°F cooler than the ground. Because hot air balloons move with the wind, there is no "wind chill" factor while you are in the basket, which makes it feel much warmer than standing on the ground on a windy day. Additionally, the massive propane burners used to heat the air in the balloon radiate a significant amount of heat downward into the basket, acting like a giant overhead heater. However, because most balloon flights take place at sunrise or sunset when ground temperatures are at their lowest, you will feel the natural morning or evening chill. Travelers are advised to dress in layers and wear a hat, as the heat from the burner can be intense on your head, even if the surrounding air feels cool and crisp.