premise: The Day of the Thunderstorm When the thunderstorm occurred, it was mid-summer just two days before the summer solstice, with the Artic daylight lasting the full 24 hours of each day.
hypothesis: The number of daylight hours each day would be greatest during the summer near the north pole.
hypothesis_graph_structure: The number of daylight hours each day<>would be<>greatest<>during the summer near the north pole