You can use the klarify app all year round. However, pollen data is only counted during the main pollen season from March to October. This means that while pollen isn't counted, klarify assumes a low pollen count. There might still be pollen in the air, but it cannot be backed up with actual pollen count data. It's a good idea to look at the allergy calendar to understand when each pollen type is expected. You can also discover the low and peak season of each pollen type.