Autumn Mood Dips: Build Your Seasonal Baseline Now

First, the required honesty: this is a tracking guide, not medical advice. Seasonal affective disorder is a real form of depression, and if autumn reliably takes you somewhere dark, that belongs with a professional; the NIMH’s overview is a solid starting point, and in a crisis in the US you can call or text 988.

Now the part an app legitimately can help with. By the end of August the days are already noticeably shorter, and every year a wave of people feel the first wobble in September without connecting it to anything. Then sometime in November they wonder: am I actually worse, or does it just feel that way? Without data, that question is unanswerable. With two months of fifteen-second logs, it’s trivial. That’s the whole pitch for starting now, while your mood is still at its summer baseline.

(Disclosure: we build MoodKit. Everything below works with paper too; the app just removes the discipline requirement.)

September is the before-picture

A seasonal pattern is a comparison claim: October-you versus August-you. Most people only start paying attention once they already feel bad, which destroys the comparison; there’s no “before” on record. Clinics see this constantly, and sources like the Cleveland Clinic note symptoms typically starting in fall and deepening through winter.

So the assignment for the next two weeks is unglamorous: log a 1-to-5 mood once or twice a day with a few tags, per the standard method. Fifteen seconds. You’re not looking for insight yet; you’re banking a baseline.

Tags that matter more after the equinox

Seasonal mood runs through a few specific channels, so give them tags now:

• Daylight: time outdoors, morning light, “left work in the dark.”
• Sleep: oversleeping is the classic SAD signature, not insomnia. If a wearable writes sleep to Apple Health, MoodKit reads it as a driver automatically.
• Movement: exercise quietly collapses in cold months; its absence is a suspect worth indicting properly.
• Food and cravings: the carb-craving pattern is real enough that clinicians ask about it.
• Social contact: withdrawal both signals and feeds a dip.

Come November, an activity-impact read over these tags tells you which channel is doing the damage, which is far more actionable than “winter is bad.”

The grid makes the season visible

Charts show weeks; seasons need months on one screen. This is the one job the Year in Pixels format is genuinely unbeatable at: twelve months of color, where a seasonal band shows up as literally a band of color change. Here’s how to read one. MoodKit draws the grid from your entries and can park it on your Home Screen as a widget, which doubles as a gentle nudge to keep logging through the low-motivation months.

Monthly comparisons close the loop: once you’ve logged enough, MoodKit reports October against September in plain numbers, so “worse lately” becomes “down 0.6 for three weeks,” dated and checkable.

Decide your tripwire in advance

Here’s the step most guides skip, and in our opinion the most valuable one: while you feel fine, write down what reading would make you act. For example: if my two-week average drops a full point below the summer baseline and stays there, I book an appointment. Deciding the threshold now matters because the dip itself erodes the motivation to decide anything later.

Acting can mean a GP or therapist visit (bring the log; a dated mood record is exactly the history they’d otherwise reconstruct from memory), asking about light therapy, or the behavioral basics from the Mayo Clinic’s SAD guidance: protected morning light, kept-up exercise, guarded sleep times.

What tracking contributes is honesty in both directions. Some Novembers the grid will show you’re fine, just tired of early sunsets, and that’s a known limit of self-report worth respecting. And some Novembers it will show a real, persistent slide three weeks before you’d have admitted it to yourself. Both answers are worth fifteen seconds a day, but only if you start collecting while the leaves are still on the trees.