What describes a seasonal pattern in mood disorders?

A seasonal pattern in mood disorders is accurately described by the characteristic that episodes have a regular temporal relationship to a specific season. This is particularly relevant in the context of Seasonal Affective Disorder (SAD), a subtype of major depressive disorder. Individuals diagnosed with SAD typically experience recurrent depressive episodes that align with the seasons, often worsening during the fall and winter months when there is less natural sunlight. These episodes tend to improve in the spring and summer.

The other options do not capture this specific relationship as effectively. For instance, episodes occurring randomly throughout the year lack the predictability associated with seasonal patterns. Changes in weather alone do not necessarily correlate with mood episodes, as they may not follow a regular seasonal timetable. Lastly, episodes occurring only during holidays do not encompass the broader seasonal aspect since they are not confined to a particular season but rather to specific festive occasions.