If your migraines ramp up as the temperature drops, you are not imagining it. Cold weather is one of the environmental triggers people with migraine report most often, and winter bundles several migraine-relevant changes into the same few weeks. The evidence on temperature by itself is more mixed than that reputation suggests, but there is a sensible way through it: understand what cold could plausibly be doing, separate it from everything else going on in winter, and track long enough to see your own pattern.
The short answer
Low ambient temperatures appear to tip some people with migraine into an attack, though studies disagree on how strong the effect is on its own. What is clearer is that winter rarely arrives alone. Cold weeks tend to come with sharper swings in barometric pressure, drier outdoor and indoor air, shifts in sleep and daylight, more respiratory infections, and less time outside moving around. If a cold snap reliably brings you a worse migraine week, the pattern is probably real. Teasing out whether the temperature itself is doing the work, or whether pressure, humidity, or wind is riding along with it, takes a season of tracking.
What the research actually suggests
Studies that have paired migraine diaries with local weather records produce a complicated picture. Some find a modest association between attack days and low temperature, or between attacks and sharp temperature changes. Others find no reliable effect of temperature once you adjust for pressure. A few report the opposite, with warmer and more humid days being more provocative.
The most consistent finding across this literature is that individual sensitivity varies a lot. Weather almost certainly matters for some people with migraine, probably does not for others, and often shows up as part of a bundle of related factors rather than a clean cold equals attack relationship. That is why population averages wash out, and why a personal diary is more informative than a general headline.
Why cold might set off an attack
Several plausible mechanisms are discussed in the migraine literature. None are settled, but each is a reasonable candidate for the effect people describe.
- Trigeminal cold sensitivity. The trigeminal system that generates migraine pain also carries cold-sensing fibres in the face and scalp. Cold-stimulus headache (the ice cream headache) is a separate diagnosis in the international classification, but it is a clue that cold on the face can activate migraine-adjacent pathways.
- Vascular responses. Cold exposure constricts peripheral blood vessels, and rewarming afterwards dilates them. Rapid swings between warm indoor spaces and cold outdoors could, in theory, provoke the vasomotor changes that accompany migraine, though this is more hypothesis than proven mechanism.
- Dry indoor air. Central heating pushes indoor humidity down sharply through the colder months. Dry mucous membranes, mild dehydration, and the general discomfort of overheated rooms are plausible contributors on their own.
- Light and sleep. Shorter days shift sleep timing and reduce bright-light exposure, which can nudge the circadian systems that influence migraine threshold.
It is rarely cold alone
If you want to understand your winter attacks, it helps to be honest about everything else that changes when the temperature falls. In a typical cold week you may also face barometric pressure fronts moving through, wind chill that keeps you indoors, drier air in heated rooms, altered meals and caffeine patterns, more disrupted sleep, higher stress loads around the holidays, and a greater chance of catching a virus. Any one of those is a known or suspected migraine trigger, and most of them tend to arrive together. That is why cold weather often looks like a stronger trigger in memory than it does in data.
How to tell what your pattern really is
Two things turn a vague my migraines get worse in winter into something you can act on:
- Enough cycles of exposure. One cold week with a bad migraine is a coincidence. Several cold snaps with the same pattern, across different months, start to look like a signal. Give yourself a season of data before drawing firm conclusions.
- Enough context around each attack. If you log attacks alongside sleep, meals, stress, your cycle if relevant, and the weather that day, you can tell whether cold weather was really the differentiator, or whether it just happened to coincide with a bad sleep week.
Practical things to try in cold weeks
None of these replace medical advice from your GP or neurologist, but they are low-risk adjustments that address plausible winter factors.
- Cover your head, ears and face when you go out into cold wind.
- Keep an eye on indoor humidity; a small humidifier in the bedroom can help if your heating is drying things out.
- Hold your fluid intake steady; cold weather blunts thirst without reducing need.
- Protect your sleep window as the clocks and daylight shift.
- If your winter pattern is clear and disruptive, talk to a clinician about seasonal preventive strategies rather than waiting it out.
How MigraineMe helps with this
MigraineMe is a migraine tracking and prediction app. For cold weather specifically, a few parts of the app do most of the work.
Auto-Captured Triggers. In the app you will find a grid labelled Triggers detected automatically from your wearable and phone data. Temperature sits in the weather group alongside pressure, humidity, wind, UV and a thunderstorm flag. Behind the scenes, a weather worker finds the nearest city to your location each day and copies in weather data from Open-Meteo. Separate scheduled workers then check whether today's value for a given factor has crossed an absolute threshold, or sits more than two standard deviations away from your own fourteen-day baseline. If it has, a Temperature low or Temperature high event is captured. This runs on a schedule rather than the instant a sensor moves, and it works from daily values rather than minute-by-minute readings.
What the HIGH, MILD, LOW or NONE label means. The badge next to each trigger in that grid is not a statistical finding. It is the certainty you set during onboarding, when you were asked how reliably that factor sets off your migraines, and you can edit it later in the Risk Model settings. That rating becomes the weight the trigger carries in your daily risk score, so if you suspect cold is a strong trigger for you, saying so is how you tell the model.
Patterns in your own data. Once you have logged a few attacks across a season (the engine needs at least three migraines and three control days before it will compute anything), the Insights area runs server-side statistics on your own diary using Fisher's exact test and a lift ratio. If low-temperature days really are more common on your attack days than on your control days, that is where it will show up, with a three-dot confidence meter driven by the p-value.
Risk score. Your daily risk score is a weighted sum of the trigger and prodrome events that fired, so weather, sleep and everything else influence it only through the events they generate. Each day lands in a NONE, LOW, MILD or HIGH zone. On the Premium tier there is also a seven-day forecast, which projects how currently fired events will fade across the week rather than predicting new ones.
MigraineMe is a tracking and prediction tool, not a medical device, and nothing in the app diagnoses or treats migraine. What it can do is give you a cleaner picture of how your own winter weeks actually look, so your next conversation with a clinician starts from data rather than a vague feeling that the cold is making things worse.