What is is 5 inches at 15 good?

The phrase "5 inches at 15" is quite vague and could potentially refer to a variety of topics, depending on the context. Here are a few possibilities:

1. Snowfall or Rainfall: It could refer to a weather report or measurement, indicating that 5 inches of snow or rain has fallen by 3:00 PM (15:00 in 24-hour time).

2. Fishing: In the context of fishing, it might describe the size of a fish caught at a specific time or spot.

3. Gardening or Agriculture: It could be a reference to plant growth, meaning a plant has grown 5 inches tall at 15 days after planting or at 3 PM.

4. Woodworking or Construction: It could refer to a measurement taken at a specific location on a piece of material or a construction project.

The interpretation heavily depends on the context in which you're asking about "5 inches at 15." If you can provide more details on the scenario or topic, I would be glad to offer more specific information.