Matthew 27:45

Now from the sixth hour, there was darkness over all the land until the ninth hour.

From noon until three o'clock in the afternoon; there was darkness everywhere. It was not mere eclipse, lasting far too long for that; it was not a dust storm, mist or fog; Luke added the words that the "sun's light failed." The gospels, therefore, clearly intended this wonder to be viewed as altogether supernatural (see more on this under Matthew 27:51).