Radio Hangar explores FAR Ninety-One One Fifty-Five, Basic VFR Weather Minimums, and the Three-Statute-Miles, Five-Hundred-Below, One-Thousand-Above, Two-Thousand-Horizontal Rule That Keeps You Out of the Cloud You Swore You Could Skirt.
Radio Hangar explores FAR Ninety-One One Seventeen, the Speed Limits, and Why Two Hundred and Fifty Knots Below Ten Thousand Is the Rule Almost Nobody Explains to a Student Pilot.
FAR 91.155 sets different VFR weather minimums for each airspace class - knowing the logic behind each number makes the table far easier to apply in actual flight.