Hypocrites! You know how to interpret the appearance of the earth and the sky. How is it that you don't know how to interpret this present time?
NIV
You playactors (hypocrites)! You know how [intelligently] to discern and interpret and prove the looks of the earth and sky; but how is it that you do not know how to discern and interpret and apply the proof to this present time?
AMP
Ye hypocrites, ye can discern the face of the sky and of the earth; but how is it that ye do not discern this time?
KJV