[mmaurizi]

Not just seasonal, the school busses are also not in use during the day while school is in session, which is unusual for mass transit busses.

[com2kid]

Most buses do at least 4 trips a day, elementary then a middle or high school route in the morning, then repeat that in the afternoon.

There are only idle for 2 or 3 hours during the day.

(Field trips can add another usage in the middle of the day as well)