Final answer:
An example of weather is the temperature and wind speed in Philadelphia today, as it represents the specific conditions at a particular place and time. So the correct option is D.
Step-by-step explanation:
When discussing the example of weather, the correct choice is D. The temperature and wind speed in Philadelphia today. This is because weather is defined as the specific atmospheric conditions at a particular place and time, including factors such as temperature, humidity, precipitation, cloudiness, visibility, and wind. In contrast, climate refers to the long-term average of weather over a significant period. Therefore, factors such as average rainfall over several months or temperature changes over decades pertain to climate, not weather.