Compound Statistics of Weather in 2191 and February

(1) The header of the double-entry statistics table contains three contents: weather, days and month.

(2) The rainy days are the least in May.

(3) The cloudy days in September are two days less than those in May, and the sunny days in May are three days more than those in September.

(4) There are 31 days in May, including six days. Rainy days; 2，3； 31，6； 3，22．