Multiple Sclerosis and Weather: Cold, Humid and Pressure Day Symptom List

Updated 3 October 2026

At a glance

The Multiple Sclerosis Trust page on temperature sensitivity describes heat sensitivity, cold sensitivity and combined sensitivity as three types of temperature sensitivity.
A survey of 757 people with Multiple Sclerosis found that most respondents were heat sensitive, with smaller groups sensitive to both or to cold alone.
A recent study of relapses and weather names high temperature, low humidity and variable atmospheric pressure as potential contributors to relapses.
This guide covers cold, cold hands and feet, humidity, pressure, one comparison line, swings between days, weather versus something else and the visit page.
Multiple Sclerosis Journey keeps external factors, heat or environment context and symptoms in one dated history with flagged days and weekly and monthly views.

Cold, pressure and humidity days rarely get the attention that heat gets. A log that gives each one the same short line shows whether they feel different in your own record.

This guide covers what the sources report about cold, humidity and pressure, what to log on each kind of day, how cold hands and feet fit, why swings between days deserve a line, how to tell a weather effect from something else and what to bring to a visit. Each section ends with how Multiple Sclerosis Journey (by Health Journey Labs) keeps that part of the record.

Cold, humidity and pressure against Multiple Sclerosis symptoms: what the sources report

Heat gets most of the attention, so cold, humidity and pressure are easy to overlook. The Multiple Sclerosis Trust page on temperature sensitivity states that as many as 8 in 10 people with Multiple Sclerosis report symptoms getting worse in response to a change in temperature, that even very small temperature changes can have a negative impact, and that the worsening is usually in symptoms already experienced rather than new issues.

A survey of 757 people with Multiple Sclerosis found that 58% were heat sensitive only, 29% were sensitive to both heat and cold, and 13% were cold sensitive only. Fatigue was the most common worsening symptom, and it affected walking and concentration. Cold sensitivity is much less common than heat sensitivity, and stiffness can especially worsen in the cold.

Humidity and pressure have thinner evidence. The Trust page lists warm, humid weather as one of the main triggers. A recent study of relapses and weather of 80 people with relapsing-remitting Multiple Sclerosis concluded that periods with high temperature, low humidity and variable atmospheric pressure were potential contributors to relapses.

Cold, humidity and pressure each deserve their own column in a log.

To keep the three apart, Multiple Sclerosis Journey lets the Daily check-in hold external factors, heat or environment context and physical symptoms on the same date, with fatigue, mobility or sensation and fog among the app-specific items. After several weeks of entries, the shared history shows which kind of weather day goes with your harder days. Insights can strengthen as that history grows.

Cold days with Multiple Sclerosis: stiffness, spasms, and sensation changes to log

The Multiple Sclerosis Society page on the effects of temperature says that people with Multiple Sclerosis who find cold a problem might notice sensory symptoms or mobility getting worse until they warm up again, or muscles feeling stiffer than usual or more prone to spasms. It notes that these effects should fade away once a comfortable temperature is found.

For a cold day, the log needs a few specific lines (Multiple Sclerosis Journey checklist):

List of symptoms on cold days, by Multiple Sclerosis Journey

The outside temperature and whether it dropped sharply compared with the day before.
Stiffness, spasms, numbness or a change in walking or balance, each named in your own words.
Whether the change eased after you warmed up, and roughly how long that took.
Fatigue and fog on the same day.
Cold hands or feet, with any color change, the sensations and how long it lasted.

The climatic chamber study of people with Multiple Sclerosis ramped air temperature down and up in a climatic chamber. Self-reports of mental and physical fatigue increased significantly in the Multiple Sclerosis group during both heat and cold, so fatigue belongs in the record on cold days. See How to Cope With Multiple Sclerosis Fatigue When You Look Fine for fatigue that others cannot see.

In Multiple Sclerosis Journey, the Flare Tracker flags a day clearly worse than a usual week, with onset, intensity and a short note for numbness, balance, fatigue or fog, and the Daily Journal takes free-text or voice notes about what the day limited. A cold morning that stands out can then be read against the weeks around it.

Humid days with Multiple Sclerosis: logging humidity together with temperature

Humidity is the hardest of the three to interpret, because the studies point in different directions. The Multiple Sclerosis Trust page on temperature sensitivity lists warm, humid weather as one of the main triggers of heat sensitivity and says that someone may find hot and humid climates an issue while coping with sunnier climates where the heat is drier. In the analysis of Veterans Affairs clinic visits the temperature and relative humidity interaction, a proxy of the heat index, was positively associated with clinic visits, while relative humidity on its own was negatively associated in the univariate analyses.

The recent relapse study went in the other direction, listing low humidity among potential contributors. Humidity is therefore logged together with temperature.

The humidity lines are paired:

Checklist of humidity and temperature, by Multiple Sclerosis Journey

☐ Relative humidity, as the local weather source gives it.
☐ The temperature at the same time, so a hot and humid day reads differently from a cool and humid one.
☐ Fatigue, fog, mobility or sensation changes, in your own words.

The Daily check-in in Multiple Sclerosis Journey holds heat or environment context and external factors alongside sleep, exercise and meds, and Custom symptoms let you add a humidity label of your own. The Daily Journal takes a line about heat or travel context, such as a humid trip, so those days can be found later.

Air pressure days with Multiple Sclerosis: the thinnest evidence and a short way to log it

Atmospheric pressure has the least support of the three. The recent study of relapses and weather analyzed the calendar of documented relapses in people with relapsing-remitting Multiple Sclerosis, and its conclusion names high temperature, low humidity and variable atmospheric pressure as potential contributors as issues needing better recognition in future investigations.

The wording is variable atmospheric pressure, which points to movement rather than a single reading. For a log, that suggests recording the level and the movement:

List of pressure day entries, by Multiple Sclerosis Journey

The pressure reading from your local weather source for the day.
Whether it moved a lot during the day, in one word such as steady, rising or falling.
Fatigue, fog, balance or sensation changes, in your own words.
Any other likely cause on the same day, such as exercise, illness or stress.

If swinging pressure days fall among your harder days again and again, the dates are worth bringing to a visit.

For sleep entries that go with these lines, see How to Sleep When Multiple Sclerosis Symptoms Keep You Up.

In Multiple Sclerosis Journey, pressure goes into the Daily check-in as an external factor or a Custom symptom, and the monthly view colors days by intensity. A run of low-pressure days and a run of hard days can be compared on the same page, with sleep, exercise and meds entries for each date.

One Multiple Sclerosis comparison line per day: the same fields for cold, humid, and pressure days

Every weather type gets the same questions, so cold, humid and pressure days can be compared.

(Multiple Sclerosis Journey framework) A useful line has these parts:

List of daily weather lines, by Multiple Sclerosis Journey

Date and weather type, such as cold, humid, falling pressure or none of these.
Temperature, humidity and pressure readings from one local source.
The symptom that changed, named the same way each time: stiffness, spasms, numbness, fatigue, fog, balance or vision.
Whether it was a symptom you have had before, using the Multiple Sclerosis Trust description that worsening is usually in symptoms already experienced.
How it settled after a change in temperature, and whether it was still there the next day.

Then add the other likely causes on the same date. The Multiple Sclerosis Society page lists exercise, sunbathing, hot baths and fever caused by an infection among causes of heat-related worsening.

The guided forms in Multiple Sclerosis Journey carry the key questions, and the Daily check-in records physical symptoms, emotional state, nutrition, sleep, exercise, meds and external factors in one pass. Because all entries build one shared history, the comparison across weather types is read against everything else logged for the same dates.

Swings between days with Multiple Sclerosis: temperature change can matter more than one cold day

The analysis of Veterans Affairs clinic visits looked at time-lagged exposure to temperature, relative humidity and temperature variation for clinic visits. In the multivariate analyses, the strongest association with a clinic visit for Multiple Sclerosis was the standard deviation of temperature, with an odds ratio of 1.012, and associations varied across climate regions. These are group results from veterans, so they cannot say what a single cold morning does to one person.

Since even small temperature changes can matter, the log holds the change from the day before alongside the day's reading.

Checklist for daily temperature swings, by Multiple Sclerosis Journey

☐ Today's high and low compared with yesterday's.
☐ The symptom change and when it began that day.
☐ A one-word note on whether the day felt harder than a usual week.

Using Multiple Sclerosis Journey, the monthly and weekly views color days by intensity, so a swing in the weather and a hard day can be matched across weeks. The Flare Tracker separates a one-off rise from a repeating pattern in the history across weeks, which suits swings better than a single cold day.

Weather effect on Multiple Sclerosis or something else: questions to ask and when to contact a clinician

Table comparing heat sensitivity and relapse, by Multiple Sclerosis Journey

The Multiple Sclerosis Trust page on temperature sensitivity offers three questions, and sets them against the signs of a relapse:

Multiple Sclerosis Journey: temperature sensitivity or relapse
More likely temperature sensitivity	More likely a relapse
Symptoms started after exposure to heat or cold	You have not been exposed to something that usually triggers your sensitivity
You have had these symptoms before	Symptoms are new or significantly worse
They improved within a few hours once you cooled down or warmed up	They last more than 24 hours with no improvement after cooling down or warming up, or continue to worsen over the following days

The Trust page advises checking in with a clinician if temperature-related symptoms are new or significantly worse, last longer than usual, do not improve after cooling, or come with signs of infection or fever, because infections can mimic or worsen symptoms and can trigger relapses. The Multiple Sclerosis Society page also says to check that there is no other reason for symptoms changing, like an infection.

A log answers these questions with dates. Write down the start time, the weather before it, the same questions answered yes or no, and the hour the change eased or the day it was still there. Contact a clinician when the answers point away from a familiar weather pattern. If symptoms feel severe or sudden, call your local emergency number (for example 911).

In Multiple Sclerosis Journey, Learn has short education topics on relapse versus a bad day, heat sensitivity and visit preparation, and the Flare Tracker keeps onset, intensity and a short note so a change can be read against the history across weeks. Help comes first; the entries are ready for the clinician afterward.

Taking a weather comparison for Multiple Sclerosis to a visit: dates, columns, and questions

A clinician has limited time, and a weather diary with no structure is hard to read in it. One page does better, built from the same columns as the daily line:

Weather comparison checklist for a visit, by Multiple Sclerosis Journey

☐ The dates of the harder days in the last several weeks, grouped by weather type.
☐ The readings for temperature, humidity and pressure for those dates.
☐ The symptoms that changed and how they eased.
☐ Other likely causes on the same dates, such as exercise, illness or a fever.
☐ Medicines in use, as dated facts, and any date a clinician updated the plan.

Visit questions take one form, Is it worth reviewing the cold days and the stiffness entries together? Is it worth reviewing the days with falling pressure and the fatigue lines together? Is it worth reviewing the dates when symptoms lasted past the next day together?

Dates when symptoms lasted past the next day are the ones to mark first. For a wider starting point on what to record, see How to Start Tracking Multiple Sclerosis Symptoms.

The Doctor Report in Multiple Sclerosis Journey is a one-page summary exported from the logged history, with dates, fatigue, mobility, fog, heat context and how you functioned, for a neurology visit. My Care Team holds clinicians and short visit notes for what to ask and bring, and My Meds records medicine names and timing for the options you already use.

How Multiple Sclerosis Journey can help

A paper notebook handles a comparison line well, as long as the columns stay the same and every row has a date. When weather, symptoms, sleep and medicine entries need to be read together across months, an app keeps them in one history; Best Multiple Sclerosis Apps 2026 compares the options.

Multiple Sclerosis Journey is a personal multiple sclerosis tracker from Health Journey Labs on the App Store and Google Play. It lets you add weather as external factors alongside symptoms, sleep and meds, flag the days that stand out and review them against the weeks around them. The shared history shows whether cold, humid or pressure days line up with your harder days, and what else the record says on those dates. Below is what you can use and how each part helps.

Daily check-in — A guided daily form for physical symptoms, emotional state, nutrition, sleep, exercise, meds and external factors, including fatigue, mobility or sensation, fog and heat or environment context, read against the rest of the logged history.
Flare Tracker — Marks a day clearly worse than a usual week, with onset, intensity and a short note for fatigue, numbness, vision, balance, fog or a low-energy day, so one-off rises separate from repeating patterns.
Daily Journal — Free-text and voice notes on what the day limited, heat or travel context, partner talks and leftover guilt after you canceled.
My Meds — Medicine names and timing for disease-modifying therapies and symptom meds you already use, read against energy weeks, sleep and heat days.
My Labs — Result dates for MRI, spinal fluid, blood counts, vitamin D and other tests, read against fatigue and function.
My Care Team — Clinicians and short visit notes, used to prepare what to ask and bring, to write notes during the visit and to review afterward.
Doctor Report — A one-page summary exported from the logged history: dates, fatigue, mobility, fog, heat context and how you functioned, for a neurology visit.
AI companions — Clara for general chat plus knowledge, fitness, nutrition and relationship companions, all able to see the logged history; useful for a calm partner script, a softer work line or a listening ear after a wiped day.
Learn — Short education topics and prompts on fatigue, heat sensitivity, pacing, relapse versus a bad day and visit preparation.
Weekly Goals — One small aim for the week and a record of whether it held, read against real check-ins.
My Assessments — Structured check-ins beyond the daily scores, plus life and social context from onboarding.
Period Tracker — Start and stop dates, flow and how heavy or light bleeding felt, read against fatigue, fog and heat.
Food Tracker — Meal or drink lines, including caffeine and alcohol, read against energy, sleep and fog.
Weight Tracker — Scale readings or body notes, read against energy, sleep and flare.

Everything you log builds one history, and insights get stronger as it grows. Custom symptoms let you add your own labels.

We make Multiple Sclerosis Journey at Health Journey Labs. This guide is educational and does not replace medical advice. Diagnosis, medication decisions, and urgent care decisions belong with your treating clinicians.

Sources

FAQ

The answers below draw on the sources cited in this guide, and the app they mention is Multiple Sclerosis Journey (by Health Journey Labs).

Does cold weather make Multiple Sclerosis symptoms worse?

For some people it does. The Multiple Sclerosis Society page describes sensory symptoms or mobility getting worse until you warm up again, and muscles feeling stiffer or more prone to spasms, though it says the effects should fade once a comfortable temperature is found.

The Flare Tracker in Multiple Sclerosis Journey records onset, intensity and a short note for stiffness, numbness or balance changes, so cold days that stand out can be compared with the weeks around them in the shared history.

Is cold sensitivity as common as heat sensitivity?

Heat sensitivity is the more common type of temperature sensitivity. In the survey linked above, most respondents were heat sensitive, with smaller groups sensitive to both heat and cold or to cold alone, so cold needs its own column.

The Daily check-in in Multiple Sclerosis Journey holds heat or environment context and external factors on each date, so your own history can show whether hot days, cold days or both line up with harder weeks.

Does humidity matter for Multiple Sclerosis symptoms?

The evidence is mixed. The Multiple Sclerosis Trust page lists warm, humid weather as a main trigger of heat sensitivity, while a veterans analysis found relative humidity alone negatively associated with clinic visits and the temperature and humidity combination positively associated.

Multiple Sclerosis Journey lets you add humidity as a Custom symptom or an external factor alongside temperature in the Daily check-in, so humid days are recorded together with the heat or environment context for the same date.

Does barometric pressure affect Multiple Sclerosis?

The evidence is thin. A recent study named variable atmospheric pressure among potential contributors to relapses, but it was a retrospective calendar analysis, and the authors call for better recognition of these issues in future investigations.

In Multiple Sclerosis Journey, pressure can go into the Daily check-in as an external factor, and the monthly view colors days by intensity, so low-pressure days and harder days can be compared on one page.

How do cold, humid and pressure days feel different?

Cold days are described with stiffness, spasms and sensory or mobility changes, humid days with the heat-related worsening of fatigue and weakness, and pressure days have no agreed description. Your own entries are the only way to see which description fits.

The Daily Journal in Multiple Sclerosis Journey takes free-text or voice notes about what the day limited, which lets you describe a cold, humid or low-pressure day in your own words without forcing it into a score.

Which weather details are worth logging?

Keep temperature, relative humidity and pressure from one local weather source, plus the change from the day before. Alongside them, write the symptom that changed, whether you have had it before and how it settled.

The Daily check-in in Multiple Sclerosis Journey records external factors on the same date as physical symptoms, sleep, exercise and meds, which keeps each weather line attached to the day it describes and easy to find later.

How can I tell a weather effect from a relapse?

The Multiple Sclerosis Trust page suggests asking whether symptoms started after exposure to heat or cold, whether you have had them before, and whether they improved within a few hours. Symptoms lasting more than 24 hours with no improvement point toward a relapse.

Learn in Multiple Sclerosis Journey has short topics on relapse versus a bad day, and the Flare Tracker keeps onset and duration, so the answers to those questions are already written down when you speak to a clinician.

What should I record about cold hands and feet?

Write down which fingers or toes changed, any color change, the sensations, how long it lasted and what it followed. A clinician needs the description to sort it out, since Raynaud's can also occur without Multiple Sclerosis.

The Flare Tracker in Multiple Sclerosis Journey records numbness with onset and a short note, and the Doctor Report can export those dates with mobility and heat context as a one-page summary for a visit.

Do temperature swings matter more than one cold day?

In the veterans analysis, the standard deviation of temperature was the strongest predictor of clinic visits for Multiple Sclerosis. That is a group result, so the log should hold both the day's reading and the change from the day before.

Multiple Sclerosis Journey separates a one-off rise from a repeating pattern through the Flare Tracker and the history across weeks, which suits a question about swings better than a single entry on one cold day.

When should I contact a clinician about weather-related symptoms?

The Multiple Sclerosis Trust page advises checking in when symptoms are new or significantly worse, last longer than usual, do not improve after cooling or warming, or come with signs of infection or fever.

The Flare Tracker in Multiple Sclerosis Journey stores onset, intensity and a short note, and My Care Team holds clinicians and visit notes, so the dates and details are ready for the conversation with the clinician.

Does where I live change the pattern?

It can. The veterans analysis found that associations between meteorological conditions and clinic visits varied across climate regions, and the Multiple Sclerosis Trust page says hot and humid climates may be an issue while sunnier, drier heat is easier for some people.

Because Multiple Sclerosis Journey builds one shared history, a move or a trip shows up as a change in the external factors and heat or environment context, which makes it easier to compare weeks in different places.

What should I bring to a visit about weather and symptoms?

Bring one page: the dates of harder days grouped by weather type, the readings, the symptoms that changed, other likely causes, the dated medicine list and the days symptoms lasted past the next day. Questions work best in the form Is it worth reviewing these dates together?

The Doctor Report in Multiple Sclerosis Journey exports a one-page summary of dates, fatigue, mobility, fog, heat context and how you functioned, and My Care Team holds what to ask and bring for the visit.

Can an AI chat help me read my weather log?

An AI chat can help organize notes and word questions. A clinician interprets the pattern, so treat any answer as a list of items to raise and check each one against your own dated entries and the sources listed here.

The AI companions in Multiple Sclerosis Journey, including Clara for general chat, already see the logged history, so a question about cold or humid days starts from your real entries instead of a blank page.

How can I protect my privacy in what I write about my health?

Relapse dates, MRI results and notes on bladder or memory changes are details that an employer or insurer could misread. Lock the device, store scan reports away from shared spaces, and send each form only what it requires.

Entries you add to Multiple Sclerosis Journey are your own health notes. Check the app's privacy policy for how data is stored and handled. Nothing in this article is medical advice.