Not sure about wind speed, but I do know the temperature at which frostbite sets in.
At negative forty (-40) degrees Fahrenheit, frostbite will begin to set in around your fingers and toes and slowly "creep" towards the center of your body as the temperature steadily falls. Frostbite occurs when the body detects extreme cold. The brain sends a message to blood vessels to "call in the troops" to protect and warm the vital organs. Your brain basically uses your limbs as cannon fodder to keep your heart, lungs, and other vital organs safe from the extremely cold temperatures.
No at negative forty Fahrenheit frostbite will not creep up it will set in fast. It will be within ten min on fingers and toes if you are not dressed properly. With any kind of wind on top of that it will be faster yet. wind plays a very large factor on what the air temperature feels like. For example, at -10F with a 5 mph wind the air temperature feels like -22F.
It takes only minutes for you bare skin to get frostbite if the temperature is below 20 F and the wind is blowing at 20 mph or more.
the temperature below freezing
The temperature below freezing
Anything 0 degrees Celsius or below.
cheese
depends on the temperature depends on the temperature
Frostbite is caused by the tissues that were subjected to extremely cold tempuratures to die off, because they are frozen or the nerves were damaged.
Frostbite usually effects the body's extremities such as the toes and fingers.
That is not how frostbite occurs. Frostbite occurs when the water that is in the cell freezes due to the cold temperatures outside of the body. The water in the cells freezes, and stops oxygen from reaching that cell.
The most important way of preventing frostbite is to get out of the cold.
Be re-warmed to normal body temperature.
Be re-warmed to normal body temperature.
It depends on the temperature and how much thermal protection you have. Exposed skin in very low temperatures can acquire frostbite in minutes.
At that temperature, it's likely that you've already died.
Put the finger in water, temperature 100 - 104F.
Since blood heats the skin, and in the cold the body wants to keep the core warm, it reduces circulation to the extremities which can cause frostbite.
Cold enough to Freeze and kill the cells so around 0 degrees. However, if the skin is damp, and especially if there is wind, frostbite can occur at slightly higher temps. This is due to several factors: 1) Moisture evaporating from skin pulls additional heat from the surface. This is why sweating cools you, but it can be a liability in cool conditions. 2) Air movement increases heat loss, both directly (by moving the layer of warmer air next to your skin away more quickly) and indirectly (by increasing the rate of evaporation of any moisture on exposed skin). 3) The human body's built-in reaction to cold conditions (any time core temperature starts to drop) is to constrict blood flow to the extremities to maintain core temperature for as long as possible. Thus, your body's natural reaction may prevent hypothermia, but make you more vulnerable to frostbite. Put another way: The ambient temperature does NOT have to be at or below freezing (32F or 0C) for frostbite to occur. If you are wet, the wind is blowing, and you have inadequate clothing, you can still suffer frostbite and/or hypothermia even in temperatures that are technically above freezing. Even lower ambient temperatures do make it easier to get frostbite, however.