How to Select and Store Lemons:
Choose lemons that are firm and heavy for their size, with a close-grained, slightly glossy yellow peel. To tell if a lemon is heavy for its size, pick up two lemons at once and go with the heavier lemon. Avoid wrinkled fruits as well as those with hard or soft patches, or with a dull or excessively yellow peel, as these are all indications that the fruit is no longer fresh.
They can be stored at room temperature for up to one week, or in the fridge for 2-3 weeks.