It happens on an ordinary evening sometime in the next few weeks. You're standing at the kitchen counter a little before six, the window has gone from gray to black without asking, and something in your chest says here we go again before you've decided to think anything at all. Nothing has actually happened. There's no bad news and no lost job, only a lamp switched on earlier than it was last week. But the sentence that follows that flicker, something like this is going to be a long, flat stretch until March, doesn't feel like a thought. It feels like a weather report.
That sentence is a forecast, and the people who study seasons have found it worth examining, because forecasts about winter differ wildly between people who live through the same weather. Here is what the research says, and where it stops.
The Dip and the Disorder Are Not the Same Thing
The National Institute of Mental Health (NIMH) says plainly that many people feel "down" or have the "winter blues" when the days get shorter in fall and winter, and feel better in spring when longer daylight returns. Seasonal affective disorder, or SAD, is a different matter: a type of depression with a recurring seasonal pattern, symptoms lasting about four to five months of the year, and a diagnosis that requires seasonal depressive episodes for at least two consecutive years. In most cases the symptoms start in late fall or early winter. NIMH also notes that SAD occurs much more often in women than in men, and that it usually begins in young adulthood. The NHS describes the same picture for the UK, and it adds the practical point that you should see a GP if you think you might have SAD, or if you've been diagnosed and treatment isn't helping. Everything below about mindset concerns the ordinary seasonal dip and how you relate to the months ahead, and none of it replaces treatment for the second category.
A City Where the Sun Doesn't Rise for Two Months
Tromsø, Norway, sits at roughly 69 degrees north, above the Arctic Circle. According to a 2020 paper by Kari Leibowitz and Joar Vittersø, the sun stays below the horizon there from mid-November to mid-January, leaving two to five hours of twilight a day. If winter low mood were simply a matter of light, Tromsø would be the place to see it at full strength.
It isn't, or at least not clearly. The Tromsø Study, a population survey of 8,951 adults published in BMC Psychiatry in 2012, found no significant seasonal differences in reported mental distress, although sleeping problems were more common in winter. Its authors were careful with their own conclusion: some people in the sub-Arctic are clearly affected by the darkness, but the overall negative impact of winter on adult mental distress is "not conclusive." Leibowitz and Vittersø hypothesized that a positive wintertime mindset might be at least partly responsible for how people in the high north cope with the dark, and they set out to measure it.
What 238 Norwegians Said About Winter
The team mailed invitations to addresses in three places, the Oslo area, the county of Troms (which contains Tromsø), and Svalbard, and 238 people completed the survey between mid-January and early February. To measure mindset they built a Wintertime Mindset Scale, with statements such as "I love the coziness of the winter months," "There are many things to enjoy about the winter," and "I enjoy doing many things I only do during the winter," alongside reversed items like "I find the winter months dark and depressing." People who scored higher on positive wintertime mindset reported higher life satisfaction and more positive emotions. Those living farther north also held more positive mindsets, and mindset statistically mediated the relationship between where someone lived and how well they felt, which is the researchers' way of saying it appeared to sit in the middle of that link.
The detail worth sitting with is the third statement on that scale. It doesn't ask whether you tolerate winter. It asks whether there are things you look forward to precisely because it's winter.
What the Study Can't Tell You
A survey is a snapshot, and this one can't show which way the arrow points.
The authors say so themselves: because the study was cross-sectional, they could not make claims about causal direction. A positive winter mindset might lead people to spend more time enjoying the season outdoors and so feel better, but being generally satisfied with life could just as easily produce a kinder view of winter. The response rate was 15.9 percent, they acknowledge they can't be sure the sample represents the three regions, and the Svalbard group is almost certainly self-selecting, since people there usually stay for months or a few years rather than a lifetime. Norway also has a culture in which being outdoors in every season is ordinary, which is not something you can import in a weekend. NIMH takes a similarly careful line on the thinking side: negative thoughts and feelings about winter are common among people with SAD, and it's unclear whether they cause the low mood or result from it, but they can be a useful focus of treatment. A seasonal adaptation of cognitive behavioral therapy (CBT-SAD) typically runs as two group sessions a week for six weeks, replacing negative season-related thoughts with more positive ones and scheduling pleasant activities. In a direct comparison with light therapy, NIMH reports, both were equally effective, and a study that followed patients across two winters suggested the benefit of CBT lasted longer.
Notice Your Winter Script Before the Clocks Change
In the UK the clocks go back at 2 a.m. on Sunday, October 25, 2026, and in the US daylight saving time ends at 2:00 a.m. on Sunday, November 1. That leaves roughly three to four weeks to do something quieter than bracing yourself.
Try this the next time the dread shows up at the window. Sort what you're telling yourself into two piles. "It's dark by quarter to six" is a fact. "I'll be useless until March" is a prediction, and predictions can be checked. Write the second one down word for word, then ask what your own past winters actually support: which weeks really were flat, and which had a long walk, a good soup or a friend on the sofa in them. This is an everyday mindfulness and CBT-style habit, not a treatment protocol, but it does what the Norwegian scale hints at, which is to separate the season from the story about the season. Don't argue with the dread. Sort it.
Build a Winter List While There's Still Light
Take the third item from that Norwegian scale literally and write down three to five things you can only do between now and March. They have to be specific enough to schedule: the thick-soled boots and a loop around the park at lunchtime, a stew that makes no sense in July, a standing Sunday call with a friend who lives two time zones away, the film series you've been saving for a dark evening. Put at least one on the calendar before the clocks change, and make it a daytime one, because the NHS's own self-care advice for SAD starts with daylight.
That advice is unglamorous, and it's a sensible template for the ordinary dip too:
- Get as much natural daylight as you can, and try to go outside in the daytime every day.
- Regular exercise
- Staying in contact with friends and family
- Keeping up with your usual activities instead of hibernating from them
- Going to bed and waking up at the same time every day, with no phone right before bed, and not too much alcohol, among other basics
Light boxes are the other thing people ask about. NIMH describes light therapy for winter-pattern SAD as sitting in front of a 10,000-lux box, about 20 times brighter than ordinary indoor light, for roughly 30 to 45 minutes, usually first thing in the morning, from fall to spring. The NHS adds that it isn't usually available on the NHS because there isn't enough evidence to tell whether it works, although many people find it helps, and it advises speaking to a GP first because light therapy may not suit people with certain eye conditions or those taking medicines that increase light sensitivity. If you do buy one, check that it is rated at 10,000 lux and filters out UV, and in the UK that it carries a UKCA or CE mark. A lamp that doesn't state its lux rating isn't worth the shelf space.
When It Is More Than a Mood
This article is general information, not medical advice, and the line matters. NIMH lists a persistent sad, anxious or empty mood most of the day, nearly every day, for at least two weeks among the signs of depression, along with hopelessness, loss of interest, changes in sleep or appetite, and trouble concentrating. If that sounds familiar, or if you recognize the same pattern from last winter and the one before, book the appointment now rather than in December. NIMH notes that because SAD's onset is so predictable, people with a history of it might benefit from starting treatment before the season begins, though few studies have looked at whether it can be prevented.
In the UK, if you're 18 or over (16 or over in some areas), you can refer yourself to NHS Talking Therapies without seeing a GP first. In the US, NIMH points to the SAMHSA treatment locator at findtreatment.gov. If you're having thoughts of suicide or self-harm, call or text 988 in the US, call Samaritans free on 116 123 in the UK, or use your local emergency number.
Before it gets dark tonight, write down the three things on your winter list and pick one for a weekend morning. The dread may still arrive on the first black evening at the kitchen window, and it's allowed to. It just doesn't get to write the schedule.
Sources: NIMH, Seasonal Affective Disorder; NHS, Seasonal affective disorder (SAD); Leibowitz and Vittersø (2020), International Journal of Wellbeing; Johnsen, Wynn and Bratlid (2012), BMC Psychiatry; clock dates from GOV.UK and The Old Farmer's Almanac.