CREATE TABLE table_name_23 (snow__days_year_ INTEGER, sunshine__hrs_year_ VARCHAR(255), storms__days_year_ VARCHAR(255))
What is the amount of snow where the sunshine is 1 633, and storms are lower than 29?
    
SQL: SELECT AVG(snow__days_year_) FROM table_name_23 WHERE sunshine__hrs_year_ = "1 633" AND storms__days_year_ < 29