Who Do I Properly Store Olive Oil?
Olive oil should be stored in a dark location which has a constant, cool temperature, definitely away from direct heat and sunlight. Your pantry or kitchen cupboards away from the stove and the back of the fridge.
Always reseal the container, and where possible store in it's original, darkened bottle packaging.
Try to take your usage patterns into account when you buy your oil to ensure that you're not storing too much - particularly if you don't have ideal conditions.
If you have bought in bulk, decant in smaller amounts for day to day usage - keeping oxygen exposure for the bulk drum / container to an absolute minimum.
If you live in a really hot climate you can store your oil in the refrigerator, in which case you may find your oil will crystallise or solidify slightly. This will not affect the flavour, and allowing the oil to return to room temperature before using will return your oil to normal.