Final answer:
The Gulf Stream's influence on Miami's climate is characterized as warm and rainy. This is due to the warm waters of the Gulf Stream increasing both temperature and humidity levels in the region.
Step-by-step explanation:
The Gulf Stream is a warm ocean current that has a significant impact on the climates of the regions it flows past, including Miami, Florida. Its warm waters heat the air above, which leads to the air absorbing more moisture. Consequently, the climate of Miami could be characterized by warm temperatures and a greater likelihood of rainfall, influenced by the heat inertia of the Gulf Stream, which leads to more moderate temperatures and higher humidity levels.
Among the options provided, the Gulf Stream's effect on Miami's climate is most accurately described as warm and rainy (option 4). The presence of the Gulf Stream contributes to Miami's humid subtropical climate, characterized by warm, mild winters and hot, humid summers, with a decent amount of precipitation throughout the year.