Chairlift Wind Chill Calculator
The National Weather Service wind chill formula plus the wind a moving lift makes itself, with frostbite exposure times.
Wind chill table
| Air °F | 5 mph | 10 mph | 15 mph | 20 mph | 25 mph | 30 mph | 40 mph | 50 mph |
|---|---|---|---|---|---|---|---|---|
| 40 | 36 | 34 | 32 | 30 | 29 | 28 | 27 | 26 |
| 30 | 25 | 21 | 19 | 17 | 16 | 15 | 13 | 12 |
| 20 | 13 | 9 | 6 | 4 | 3 | 1 | -1 | -3 |
| 10 | 1 | -4 | -7 | -9 | -11 | -12 | -15 | -17 |
| 0 | -11 | -16 | -19 | -22 | -24 | -26 | -29 | -31 |
| -10 | -22 | -28 | -32 | -35 | -37 | -39 | -43 | -45 |
| -20 | -34 | -41 | -45 | -48 | -51 | -53 | -57 | -60 |
| -30 | -46 | -53 | -58 | -61 | -64 | -67 | -71 | -74 |
Shading marks the published frostbite thresholds: 30 minutes below −18, 10 minutes below −32, and 5 minutes or less below −48.
The lift makes its own weather
A high-speed detachable moves at about 11 miles an hour, and a gondola faster still. That is wind, whatever the forecast says — on a dead calm day a six-pack generates the same chill as standing in an 11 mph breeze, for the whole ride. It is why the lift is reliably the coldest part of a ski day despite being the part where you are doing nothing.
This tool adds the lift speed to the ambient wind, which is the headwind case. A lift line runs into the prevailing wind about as often as with it, and the direction that matters for planning is the one that hurts.
What wind chill does and does not mean. It is how fast exposed skin loses heat, not a real temperature — your water bottle will not freeze any faster at −30 wind chill than at the actual air temperature. It applies to bare skin, so the fix is covering up rather than adding a layer to your torso. And it says nothing about damp: wet gloves or a sweaty base layer will beat the number on this page comfortably.
How to use
- Enter the air temperature and wind speed.
- Add the lift speed, which adds its own wind.
- Read the effective temperature and exposure time.
- Cover exposed skin before the ride, not during it.
Frequently asked questions
What does wind chill actually measure?
How fast exposed skin loses heat, expressed as the still-air temperature that would feel the same. The current formula dates from 2001 and is based on modelled heat loss from a human face, replacing an older and less realistic version.
Why add the lift speed to the wind?
Because moving through still air produces wind relative to you, and a chairlift is a sustained ride at speed with no shelter. A calm day on the ground can be a genuinely cold wind on the lift, and adding the two gives a much better idea of what your face will experience.
Does wind chill affect objects too?
No — and this is a common misunderstanding. Wind chill describes heat loss from a warm body, so it accelerates cooling toward the air temperature but cannot take anything below it. A water bottle will not freeze at an air temperature above freezing however hard the wind blows.
How quickly can frostbite occur?
At severe wind chills, in a matter of minutes on exposed skin — the published tables give exposure times for frostbite on exposed flesh, and at the extremes those are shorter than a single lift ride. This is why the cheeks and nose between goggles and neck gaiter are the classic casualty.
What should I cover?
The gap between goggles and face covering, which is where almost all frostnip on the mountain happens. Wind at the ears and any exposed wrist between glove and jacket are the next most common, and all of them are trivially fixed before getting on the lift.
Are the frostbite times a guarantee?
No. The tables assume exposed dry skin on a typical adult, and wet skin, wind gusts, altitude, fatigue, alcohol and individual circulation all shorten the time. They are a guide for planning, not a countdown, and nothing here is medical advice.
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