The short answer
Seasonal depression, clinically called major depression with a seasonal pattern (often shortened to SAD), is depression that returns at the same time each year, usually starting in fall and lifting in spring. In New Hampshire, where the sun sets around 4:12 pm in early December, it is common and very treatable. Light therapy, cognitive behavioral therapy, and medication all have solid evidence behind them, and many people do best with a combination.
If your mood, energy, or sleep reliably shifts when the clocks fall back, this post is for you.
Why New Hampshire winters hit harder
Concord gets about 15 hours and 26 minutes of daylight at the June solstice and only about 9 hours at the December solstice. That is more than six hours of light lost between summer and winter. (source)
Three things stack up for us here:
- Latitude. A 2025 meta-analysis found that seasonal depression becomes more common the farther you live from the equator. (source) Most of New Hampshire sits above the 43rd parallel.
- The clock change. Daylight saving time ends on November 1, 2026. Overnight, the sun sets an hour earlier, and many people leave work in the dark until March.
- Weather and isolation. Cloud cover, cold, and icy roads keep people indoors and cut down on the outdoor light, movement, and social time that protect mood. In the North Country and Lakes Region, longer drives make it even easier to stay home.
Estimates suggest seasonal depression affects roughly 1.5% to 9% of U.S. adults, with higher rates in northern states. (source) A larger group has milder symptoms that still make winter harder than it needs to be.
Winter blues or seasonal depression?
The difference is how much it gets in the way. Most of us feel a little slower in January. Seasonal depression changes how you function, and it comes back on roughly the same schedule each year.
| Winter blues | Seasonal depression | |
|---|---|---|
| Mood: | A bit flat, still enjoy things | Persistent low mood or numbness, loss of interest |
| Daily life: | Work and relationships mostly intact | Falling behind, canceling plans, struggling to get through the day |
| Duration: | Comes and goes | Most days, for two weeks or more |
| Pattern: | Varies year to year | Starts and lifts around the same time each year |
If you are somewhere in between, that still counts. You do not need to meet full criteria to deserve support.
Signs adults often miss
Winter-pattern depression often looks less like sadness and more like hibernation. Watch for:
- Sleeping much more than usual and still waking up tired
- Strong cravings for carbs and sweets, often with weight gain
- Heavy, sluggish limbs or a body that feels like it is moving through mud
- Pulling away from friends, family, and things you normally enjoy
- Irritability or a short fuse, especially late in the day
- Trouble focusing, or tasks that used to be easy suddenly feeling huge
- Feeling hopeless or worthless
For neurodivergent adults, winter can add another layer. Many people with ADHD already have a later body clock, and dark mornings can make waking, focus, and routines even harder. If your executive function seems to drop off a cliff every November, that pattern is worth naming with a provider.
We wrote more about the quieter faces of depression in Depression Doesn’t Always Look Like Sadness.
What actually helps
Seasonal depression responds well to treatment, and the best plan depends on how severe your symptoms are, your health history, and what fits your life.
Light therapy
Bright light therapy is one of the best-studied treatments. The usual approach is a 10,000 lux light box for about 30 minutes each morning, ideally soon after waking. (source) You do not stare into it. It sits off to the side while you eat breakfast or read. Many people notice a difference within one to two weeks.
A note of caution: light therapy is not right for everyone. If you have bipolar disorder, certain eye conditions, or take medications that increase light sensitivity, talk with a provider before starting.
Therapy
Cognitive behavioral therapy adapted for seasonal depression (CBT-SAD) helps you spot the winter thought patterns and pull-back behaviors that deepen low mood, then plan around them. Research suggests its benefits may last into future winters, not just the current one.
Medication
Antidepressants can help, especially when symptoms are moderate to severe or light therapy alone is not enough. Bupropion XL is FDA-approved for preventing seasonal depression episodes when started before symptoms usually begin. Some people take medication only during the darker months; others need year-round support. A psychiatric provider can help you weigh the options.
Everyday supports
These will not replace treatment for moderate or severe depression, but they make a real difference:
- Get outside in the first half of the day, even on cloudy days. Outdoor light is much brighter than indoor light.
- Keep a steady wake time, including weekends.
- Schedule social time before you feel like it. Waiting for motivation in January is a losing game.
- Move your body in whatever way works for you.
- Ask your primary care provider whether checking your vitamin D level makes sense. The research on supplements for mood is mixed.
We cover how therapy and medication work together in Understanding Anxiety: How Therapy and Medication Can Help.
When to reach out, and how we help
Reach out if symptoms last more than two weeks, make work or relationships harder, or show up the same way every fall. The best time to plan for winter is before it arrives.
At Balance Mental Health, we offer psychiatric evaluations, medication management, and therapy for adults across New Hampshire, in our Concord office or by telehealth statewide. That means you can start care from Laconia, Plymouth, Keene, or the North Country without driving through a snowstorm. Our approach is collaborative, trauma-informed, and affirming of neurodivergent and LGBTQ+ clients, and of every adult who walks through our door.
Wondering about wait times? Read How to Get a Psychiatric Evaluation in NH Without the 6-Month Wait, or request an appointment today.
If you are in crisis or thinking about suicide, call or text 988 any time, or go to your nearest emergency room.
Frequently asked questions
Is seasonal depression real depression? Yes. It is major depression with a seasonal pattern. It can be just as serious as depression that happens year-round, and it deserves the same care.
When does seasonal depression usually start in New Hampshire? For most people, symptoms build in October and November, often right after the clocks fall back, and ease in March or April.
Do light therapy lamps actually work? For many people, yes. A 10,000 lux light box used for about 30 minutes each morning is a well-studied treatment. Check with a provider first if you have bipolar disorder or eye conditions.
Can I get help for seasonal depression by telehealth in NH? Yes. We see adults anywhere in New Hampshire by telehealth for evaluations, medication management, and therapy.
Should I start treatment before winter? If you know your pattern, earlier is better. Starting light therapy or medication in early fall can prevent or soften an episode.
Can you have seasonal depression in summer? Yes, though it is less common. Summer-pattern depression often shows up as insomnia, restlessness, and low appetite rather than oversleeping.
