SCHEMA:
CREATE TABLE table_name_98 (sunlight_hours INTEGER, city_town VARCHAR, days_with_frost VARCHAR)
USER:
What is the lowest number of sunlight hours, and number of days with frost, more than 30, for the city of Ourense?

QUERY:
SELECT MIN(sunlight_hours) FROM table_name_98 WHERE city_town = "ourense" AND days_with_frost > 30