Question: What is the amount of fog where the rain is 1 109?
SQL: SELECT SUM("Fog (days/year)") FROM "2-15902689-1" WHERE "Rain (mm/year)" = '1 109';

Question: What is the amount of snow where the days for storms are 31?
SQL: SELECT SUM("Snow (days/year)") FROM "2-15902689-1" WHERE "Storms (days/year)" = 31.0;

Question: 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 "2-15902689-1" WHERE "Sunshine (hrs/year)" = '1 633' AND "Storms (days/year)" < 29.0;

Question: What are the number of storms where fog is lower than 74, and sunshine is 2 668?
SQL: SELECT COUNT("Storms (days/year)") FROM "2-15902689-1" WHERE "Fog (days/year)" < 74.0 AND "Sunshine (hrs/year)" = '2 668';