During the twenty-one years ending 1873, the maximum period of thunder with or without lightning, at Oxford, extended from about 9th April to the end of October, the middle of the period being the first week of July; the three highest days taken consecutively being those immediately preceding the summer solstice. During the five months from November to March, only thirteen cases had occurred during the period. Lightning, on the other hand, had its maximum period from May to November,—particularly during August, September, and October. The maximum period of hail was during the first six months of the year; whereas, during the second half of the year, very few cases occurred. The snow period extended from the middle of October to the middle of May,—most falling from December to March,—the absolutely highest month being March.