What is the largest amount of sunlight hours for the City of Pontevedra?
CREATE TABLE "climate" (
  "city_town" text,
  "july_av_t" text,
  "rain" text,
  "days_with_rain_year_summer" text,
  "days_with_frost" real,
  "sunlight_hours" real
);
SELECT MAX("sunlight_hours") FROM "climate" WHERE "city_town"='pontevedra';