Final answer:
High humidity, warm temperature, and low pressure are the combination of factors that create rain.
Step-by-step explanation:
Precipitation, such as rain, is influenced by a combination of factors including high humidity, warm temperature, and low pressure. High humidity means there is a large amount of water vapor in the air, which can lead to condensation and the formation of clouds. Warm temperature helps the air hold more moisture, increasing the chances of precipitation. Low pressure systems allow warm, moist air to rise and cool, leading to the formation of clouds and ultimately rainfall.