Here's a problem to solve: Students make weather observations outside the school building, and then they record their observations. Which observation should be recorded as a fact?

Among the 4 following options, which is the correct answer?

- A: The air feels very cold.
 
- B: The wind is blowing at 5 m/s.
 
- C: It is nicer than the day before.
 
- D: It looks like it might warm up later.
 