How do you calculate the seasonal distribution of precipitation?

Calculating the Seasonal Distribution of Precipitation Indicates the climate influences at work, and therefore different climate types.

For winter:

Add precipitation totals for October, November, December, January, February, and March.

Winter Max. = Maritime

(large difference between Winter and Summer = West Coast)

(slight difference between Winter and Summer = East Coast)

For Summer: add precipitation totals for April, May, June, July, August, and September.

Summer Max. = Continental

Ex: 25+53+77+70+49+48= Summer = 322

15+12+13+12+10+15= Winter = 77

(larger Number) - (smaller Number) = East or West Coast

322 - 77 = 245 = West Coast