Ski layering calculator: temperature, wind chill and what to wear
Ski clothing is three layers with one job each: a base layer that moves moisture, a midlayer that holds warm air, and a shell that stops wind and snow. Resort skiers cool for half of every lift cycle and want insulation worn constantly. Tourers generate heat continuously and want a light base plus a wind shell on the climb, with insulation going on at every transition instead.
The temperature is only half the question. A resort skier riding a chairlift is cooling for half of every cycle, and a tourer climbing three thousand feet is generating heat continuously. The same air temperature calls for genuinely different clothing in the two cases, and dressing for the summit on the way up is how a tourer arrives soaked and then gets cold.
Layering calculator
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In Fahrenheit.
In miles per hour, at the exposed part of the day.
Wind chill uses the current National Weather Service formula and the frostbite exposure times are the published NWS thresholds. This is general information rather than a personal risk assessment.
The bands, split by activity
| Temperature | Resort, lift-served | Touring, climbing |
|---|---|---|
| Above freezing 33 to 50 F
| Light base, no midlayer, and a shell you can vent. Expect wet snow and pack a second pair of gloves. | Skin in the base layer alone. A vest at most. Nearly everyone overdresses in this band. |
| 20s Fahrenheit 21 to 32 F
| Midweight base, grid fleece, insulated jacket or a shell over a light puffy. The classic bluebird setup. | Light base and a wind shell up. Insulation stays packed and goes on at every transition, not before. |
| Single digits to 20 6 to 20 F
| Heavyweight base, grid fleece, insulated shell, face covered, goggles that do not gap. This is where the cheap glove fails. | Midweight base, wind shell, and a genuinely warm belay parka that lives in the pack for transitions and skins-off stops. |
| Below zero Fahrenheit -30 to 5 F
| Two upper layers under an insulated shell, mittens rather than gloves, chemical or rechargeable warmers, no exposed skin. Watch each other for frostnip. | Serious cold. Vapour management dominates: any sweat you generate on the climb becomes ice on the descent. Overboots, a spare pair of gloves and a full-coverage hood. |
Read the two columns against each other on any row and the split this site is built around is obvious. At the same air temperature the resort skier is adding insulation and the tourer is taking it off, and both are right, because one of them is sitting still for half the day and the other is working continuously.
Wind chill grid
| Air temp | 5 mph | 10 mph | 20 mph | 30 mph | 40 mph |
|---|---|---|---|---|---|
| 30 F | 25 F | 21 F | 17 F | 15 F | 13 F |
| 20 F | 13 F | 9 F | 4 F | 1 F | -1 F |
| 10 F | 1 F | -4 F | -9 F | -12 F | -15 F |
| 0 F | -11 F | -16 F | -22 F | -26 F | -29 F |
| -10 F | -22 F | -28 F | -35 F | -39 F | -43 F |
| -20 F | -34 F | -41 F | -48 F | -53 F | -57 F |
Wind is why a forecast temperature is not the number that matters. Twenty degrees with a forty mile an hour wind on an exposed ridge is the same exposure as roughly minus one degree in still air, and the ridge is exactly where you will be standing while somebody adjusts a binding with their gloves off. A windproof shell and a hood that seals around a helmet do more in that situation than any additional insulation.
The three layers, and the one job each
Base layer. Sits against the skin and moves moisture away from it. Weight is quoted in grams per square metre: roughly 150 for touring and warm days, 190 as the all-round ski choice, 250 for genuinely cold chairlift days. Merino keeps insulating when damp and resists odour; synthetics dry faster and cost less. Cotton is the only genuinely wrong answer.
Midlayer. Holds warm air. Grid fleece is the most useful single piece in snow sports because the grid traps air in the squares and moves moisture along the channels, so it keeps working while you are working. A puffy is for when you stop, not for when you are climbing, and for a wet activity it should be synthetic rather than down.
Shell. Keeps wind and snow out and lets moisture escape. Pit zips vent more moisture in a minute than any membrane does in an hour, so they matter more than the last few thousand on a waterproof rating. Fully taped seams are the difference between a jacket that keeps snow out and one that leaks at every stitch line.
Adding warmth to the wrong layer is how people end up simultaneously sweating and cold. If you are cold, change the midlayer. If you are wet, the shell or the venting is the problem. If you are clammy, the base layer is wrong or there is cotton in the system.
Extremities are where the day is actually lost
Cold hands and cold feet end more ski days than cold torsos do, and neither is usually solved with more insulation. Cold feet in ski boots come from compressed circulation, so a second sock or a thicker one makes it worse: one thin snug over-the-calf sock, a properly fitted shell, a supportive footbed, dry liners and loosening the buckles on the lift are the actual fixes.
For hands, mittens are meaningfully warmer than gloves at the same insulation because the fingers share heat, at the cost of dexterity. Carry a second pair, always, and for touring carry a light glove for the climb and a warm one for the descent, because one pair for both means either a soaked liner on the way up or cold hands on the way down.
Related
The layering chart is the printable version of the table above. The layering system explained goes deeper on what each piece does, and the roundups for base layers, midlayers and shells cover the specific pieces at each tier.
Frequently asked questions
How should I dress for skiing?
Three layers, each with one job. A base layer against the skin that moves moisture away from it, a midlayer that holds warm air, and a shell that keeps wind and snow out. Add warmth by changing the midlayer rather than by buying a warmer jacket, and never add warmth to the base layer, because a heavy base layer traps moisture against you.
Why do I get cold on the chairlift but hot skiing?
Because a resort day is a heat cycle: you generate heat on the descent and lose it sitting still on the lift, roughly half the time each. That is the opposite of a touring day, where you generate heat continuously on the climb. The resort answer is more insulation worn constantly; the touring answer is less insulation worn while moving and a warm layer put on at every stop.
What should I wear ski touring?
Far less than you think on the climb. In the 20s Fahrenheit most people climb comfortably in a light base layer and a wind shell, with insulation in the pack. Everything you sweat into on the way up becomes ice on the descent, so the discipline is to start slightly cold and to put the warm layer on at every transition rather than before it.
At what wind chill does frostbite become a risk?
The published National Weather Service thresholds are roughly 30 minutes to frostbite on exposed skin at about minus 18 Fahrenheit wind chill, 10 minutes at about minus 32, and 5 minutes at about minus 48. Those are exposure times for bare skin, which is why a face covering and goggles that do not gap matter more than another layer on your body in serious cold.
Is cotton really that bad?
Yes, and it is the one absolute rule in ski clothing. Cotton absorbs sweat, holds it against your skin and stops insulating entirely when wet, which in cold weather is a hypothermia risk rather than a comfort complaint. A cotton t-shirt under a ski jacket is the most common clothing mistake in the sport.
Do I need a heavier base layer in colder weather?
For resort skiing, yes: a 250 gsm top is a genuinely warm layer for cold chairlift days. For touring, usually not, because you generate heat continuously and a heavy base layer traps moisture. The touring answer to cold is a warmer belay-style parka that goes on at stops rather than a heavier layer worn while working.
How we choose: we compare published manufacturer specifications, published certification standards and verified owner reviews across retailers. We do not test equipment in person, and every figure quoted here is the manufacturer's published number unless we say otherwise. This is researched buying guidance and not professional instruction: binding release values are set by a certified technician on a calibrated jig, and avalanche terrain requires formal training and a current regional forecast that no article can replace.
