The short answer: people are less active in winter, and the research on daylight and mood gives a real reason to keep walking outdoors. The advice on dressing and walking on ice is mostly sensible practice rather than trial evidence. The one thing worth getting right is the cold-weather hazard thresholds, which the earlier version of this page overstated.
Why winter walking drops off
A 2021 scoping review of device-measured activity (Turrisi and colleagues, International Journal of Behavioral Nutrition and Physical Activity) found that physical activity volume was greater in summer than in winter in 23 of 30 studies, and that sedentary time was greater in winter than in spring or summer. Activity was positively linked to day length and temperature and negatively linked to precipitation. There was insufficient evidence about seasonal differences in light activity, which is where most walking sits. So if your walking drops in winter, you're in good company, and it doesn't mean you lack discipline.
Daylight and mood
The strongest reason to walk outdoors in winter is light. Measurements have found indoor light is typically 50 to 500 lux, while outdoor light is at least about 1,000 lux even on cloudy or rainy winter days. A 1996 study (Wirz-Justice and colleagues, Journal of Affective Disorders) compared a daily one-hour morning walk outdoors with a short session under a 2,800-lux lamp in people with seasonal affective disorder. After a week the walkers' depression scores fell significantly, and about half of them were in remission, while the low-dose lamp did not change the scores. It was a small, non-randomised study of people with SAD over one week, so it shows that outdoor light helps people with winter depression, not that everyone's mood benefits. If your mood drops badly each winter, talk to a doctor, since there are treatments beyond walking. The earlier page's explanation that reduced light cuts serotonin production, and its claim that outdoor light is "5 to 10 times brighter," are not what we found, so we've replaced them with the measured figures above.
What we removed
The earlier version said that taking three to four months off walking "reverses most of the cardiovascular and metabolic adaptations," that your resting heart rate rises and "fat-burning efficiency drops within weeks," and that cold adds "5 to 15%" to the calories you burn. We couldn't find a source for any of those. It also said that the body loses heat fastest from the head, which is commonly repeated, but we haven't verified it and have left it out.
Cold hazards: what the numbers say
The earlier page said a wind chill below -20C risks frostbite on exposed skin "within minutes." Environment Canada's hazard bands, which are reproduced on several weather sites, put wind chill from -10 to -27 in the "low risk, uncomfortable" range. They put frostbite times of 10 to 30 minutes at -28 to -39 and shorter beyond that. The US National Weather Service gives a similar figure, with frostbite possible on exposed skin in about 30 minutes at a wind chill of -18F (-28C) or lower.
| Wind chill (Celsius) | Frostbite hazard on exposed, dry skin (Environment Canada bands) |
|---|---|
| -10 to -27 | Low risk, uncomfortable |
| -28 to -39 | Exposed skin can freeze in 10 to 30 minutes |
| -40 to -47 | 5 to 10 minutes |
| -48 to -54 | 2 to 5 minutes |
| -55 and colder | Under 2 minutes |
These times assume dry, exposed skin; wet skin freezes faster, and covered skin is protected. So the practical rule is to cover your face, ears, hands and feet in strong wind and to take the forecast wind chill seriously from about -28C (-18F), and stay in or shorten the walk when it falls well below that. Cold air can also trigger symptoms in some people with asthma or heart conditions, so if that's you, ask your doctor what's sensible. A treadmill, a mall or an indoor track covers the worst days. Icy conditions and low visibility are the other reasons to stay in, along with illness.
Ice and snow
The "walk like a penguin" advice, meaning short steps, flat feet, knees slightly bent and weight over your feet, is widely given by physical therapists. The reasoning from biomechanics is sound: on ice, the forward and backward forces you push into the ground are what need friction, and shorter steps reduce them, as an Iowa State kinesiologist put it. But we haven't found a trial showing that penguin-walking prevents falls, or that ice cleats do. Researchers at a Toronto rehabilitation institute have lab-tested the slip resistance of nearly 100 boots and ice grips on an ice floor, and a small lab study of 19 anti-slip devices found that how fast people walked on ice tracked how risky and unbalanced they felt rather than the measured friction of the device. So footwear with real traction is sensible, but we can't tell you which products are best. We've dropped the earlier page's price range for ice grips. Walking slowly, choosing cleared or gritty routes and staying off ice when you can are all reasonable.
Dressing for it
This part is common outdoor practice rather than research. Layers you can open or remove let you adjust as you warm up, and a base layer that wicks sweat is better than cotton, which holds moisture. A windproof outer layer helps in wind. A popular rule of thumb is to dress as though it's about 10C warmer than it is, so that you feel slightly cool when you set off. Hats, gloves or mittens, and warm socks are where most people feel the cold first. Reflective gear or lights matter in the dark; if there's no pavement, walk facing oncoming traffic where that is the local convention. Drink water as you normally would. Our walking shoes guide covers footwear and walking in the rain covers wet-weather clothing.
Staying consistent
The habit-formation study most often cited (Lally and colleagues, 2010) found a median of 66 days for a behaviour to become automatic, with a range of 18 to 254 days, and that missing a single day did not materially affect the process. So a bad-weather day off doesn't undo anything; carry on the next day. Laying out your clothes the night before, agreeing to a five-minute walk and then deciding, and keeping an indoor backup are our suggestions, not study findings. The 30-day walking challenge is a gradual way to rebuild, and an hourly step chart shows whether winter walks are happening; StepMax, our own free app, has one: Android, iPhone.
Sources
- Turrisi TB, Bittel KM, West AB, et al. Seasons, weather, and device-measured movement behaviors: a scoping review from 2006 to 2020. International Journal of Behavioral Nutrition and Physical Activity. 2021;18:24. PubMed
- Wirz-Justice A, Graw P, Krauchi K, et al. "Natural" light treatment of seasonal affective disorder. Journal of Affective Disorders. 1996. researchgate.net
- Graw P, et al. Winter and summer outdoor light exposure in women with and without seasonal affective disorder. Journal of Affective Disorders. 1999. sciencedirect.com
- Environment and Climate Change Canada wind chill hazard bands, as reproduced by weather calculators. calculatorplus.ca
- US National Weather Service wind chill and frostbite guidance, as reproduced by weather calculators. basicfreetools.com
- 7 science-approved tips for walking across ice (Mental Floss, quoting Philip E. Martin of Iowa State University and iDAPT research). mentalfloss.com
- Gait speed with anti-slip devices on icy pedestrian crossings relate to perceived fall-risk and balance. PMC
- Lally P, van Jaarsveld CHM, Potts HWW, Wardle J. How are habits formed: modelling habit formation in the real world. European Journal of Social Psychology. 2010;40(6):998-1009. wiley.com
Correction note: an earlier version of this page said wind chill below -20C risks frostbite within minutes, that outdoor light is 5 to 10 times brighter than indoor light and works through serotonin, that three to four months off walking reverses most fitness gains, that cold adds 5 to 15% to calorie burn, that the body loses heat fastest from the head, and gave a price range for ice grips. We could not support those, so they were removed or corrected. The wind chill bands and frostbite times are as reproduced on weather sites quoting Environment Canada and the National Weather Service, not read from the agencies' own pages. The Wirz-Justice figures are as reported in later reviews. The dressing and ice-walking advice is common practice, not trial evidence, and the page says so. We checked the research figures against abstracts and summaries on October 2, 2026. This article is for informational purposes and does not replace medical advice. This is general information, not medical advice.