In non-legal contexts, a judgment is a balanced weighing up of evidence preparatory to making a decision.
Without a rigorous analysis, a rigid set of criteria to all forms of judgment. Often this results in unnecessary restrictions to judgment methodologies, excluding what may otherwise be considered legitimate judgments. For analogous difficulties in science and the scientific method see the Wikipedia entry on the scientific method.
From the criteria mentioned above, we could judge that "It is raining" if there are raindrops hitting the window, if people outside are using umbrellas, and if there are clouds in the sky. Someone who says that despite all this, it is not raining, but cannot provide evidence for this, would not undermine our judgment.
However, if they demonstrated that there was a sophisticated projection and audio system to produce the illusion of our evidence, then we would probably reconsider our judgment. However, we would not do this lightly, we would demand evidence of the existence of such a system. Then it would need to be decided again upon available new evidence whether or not it was raining.
Many forms of judgment, including the above example, require that they be supported by, and support, known facts which are themselves well supported, and its negation must be shown to be unfounded, before it is accepted as well founded.