Zola felt it was an ideal reward for the 100 supporters who helped clear the snow from Vicarage Road earlier in the morning.
Zola said: "I just found out that this morning, more than 100 supporters turned up here to help clear the pitch of the snow so I think they've been [rewarded] with this performance and they deserved it.
"I think we've played some better games than this but it was a mature game. The result is a little bit too hard towards Huddersfield because in the first half they made it very, very difficult for us, so we had to work hard.
"I think the goal towards the end [of the first half] helped the team a lot because we then, in the second half, managed to play the football that we want to play. They had to open up a little bit more. But it was mature because, as I said, playing at home and playing away is a completely different thing and we need to learn to do better when we play home."
The defeat stretched Huddersfield's poor league run to 12 without a win but boss Simon Grayson felt the penalty that led to the home side's opener should not have been awarded.
The Terriers boss said: "I thought, first half, we were well truly in the game. We kept them quiet, you could sense the atmosphere had gone quiet as well and the decision just before half time changed the game. We let it affect us and it obviously gave them a big confidence boost.
"The decision was wrong, it's great tackle by our right back and it's outside the box, so it's a poor decision.
"But in the second half we felt sorry for ourselves and allowed Watford to dictate the game and when you do that against a team like Watford then you're under pressure because they're a good side.
"You can see how technically good they are but we certainly felt sorry for ourselves and that was reflected in us getting done four, rather than maybe one or two."