Commentaries:
People are able to forecast the weather by the signs that they see; they know that certain kinds of weather will follow. Jesus is using that as an illustration. In verse 54, Luke says He spoke this to the people, which means to the people in general, and not to His disciples specifically. He called these people hypocrites because they were able to forecast the weather, but they could not discern what they were going through prophetically at the very time it was happening!
If he called these people "hypocrites" who were not part of His group and expected them to understand the times that they were living in, what does He expect of us? Surely He expects more. In His walk with the two disciples on the road to Emmaus, He calls them "fools" (Luke 24:25). These were His disciples, which shows that He expected more of them. He then opened their minds to the Scriptures, going through the Old Testament, as we call it today, explaining that the Son of Man had to go through this. He seems to be saying, "With all this proof, why did you not understand it?" So how much does He expect of us?
John W. Ritenbaugh
Where Is the Beast? (Part One)
Other Forerunner Commentary entries containing Luke 12:54:
Amos 7:14-17