CREATE TABLE table_42842 ("Sunshine  ( hrs/year ) " TEXT, "Rain  ( mm/year ) " TEXT, "Snow  ( days/year ) " FLOAT, "Storms  ( days/year ) " FLOAT, "Fog  ( days/year ) " FLOAT)

What is the amount of snow where the days for storms are 31?
SELECT SUM("Snow (days/year)") FROM table_42842 WHERE "Storms (days/year)" = '31'
SELECT SUM("Snow (days/year)") FROM "table_42842" WHERE "Storms (days/year)" = '31'