The storm that swept through the Sacramento region Monday and Tuesday helped compensate for a dry December while causing its share of flooding and downed trees. The downpour began with 2.38 inches of rain in downtown Sacramento on Monday, the most on Jan. 8 since the National Weather Service began recording data in 1877, and had run up to 3.56 inches by 4 a.m. Wednesday. The previous record was set last year, when 1.96 inches was reported on that date.