GregWCIL Loc: Illinois

Sorry, but not at all the same as it affects humans. Cameras don’t have skin that cools even faster as wind evaporates the moisture.

GregWCIL Loc: Illinois

What’s the wind chill on Mars?

John_F Loc: Minneapolis, MN

Wikipedia has has an article on Wind Chill. In it the wind chill index has units of energy per area per time. As the formula gives for 0 F and 0 mph a wind chill (labelled deg F) of 35.4 F which is warmer than the air temperature. There is something awry here. Past my pay grade.

Apaflo Loc: Anchorage, Alaska

Windchill is undefined at less than 3 MPH. The formula does not provide reasonable answers...

Apaflo Loc: Anchorage, Alaska

Not true.

TriX Loc: Raleigh, NC

Cameras do have skin?

IDguy Loc: Idaho

True to a first approximation. Wind chill is a mathemetical heat transfer calculation of the increased heat flow from anything as the air velocity increases. It doesn’t consider “feel”. The article writers are seeking to dumb down the engineering.

Your camera and battery will cool faster towards the ambient temperature with wind, just like the heat flow increases from your body. If you left your camera outside then it won’t cool due to wind chill.

IDguy Loc: Idaho

They aren’t.

IDguy Loc: Idaho

Nope. Wind chill is a caculation of convection cooling. The only two variables in the equation are the ambient temperature and velocity. Velocity means convective cooling.

foggypreacher Loc: Dickinson, Texas

Screamin Scott,
When I tried to follow your link, this is the message I received:

Wed Dec 05 2018 23:55:13 GMT-0600 (Central Standard Time)
The page you requested cannot be found. Please check your URL and try again.

Please use the following links for NWS forecasts and services.

There were other links but did not see one for wind-chill. Perhaps another day. Thank you anyway.

Apaflo Loc: Anchorage, Alaska

I'll have to agree with that. Velocity means heat is being carried away, and that defines convection rather than conduction. Heat is conducted to the surface, but convection removes heat from the object.

rwww80a Loc: Hampton, NH

DITTO
How much lube do you use on your body (camera that is).

Steve Perry Loc: Sylvania, Ohio

What you're describing is thermal conduction.

Every article on wind chill will tell you that it's what the temperature feels like due to the wind. The rate of thermal conduction is what causes "wind chill", but the wind chill itself, derived from the rate of thermal conduction, is how it feels when you're out in the wind at a given, cool temperature. In fact, if you look at wikipedia, the mention this:

"Many formulas exist for wind chill because, unlike temperature, wind chill has no universally agreed upon standard definition or measurement. All the formulas attempt to qualitatively predict the effect of wind on the temperature humans perceive. Weather services in different countries use standards unique to their country or region; for example, the U.S. and Canadian weather services use a model accepted by the National Weather Service. That model has evolved over time."

Of particular interest:

"the temperature humans perceive"

So, how it feels is certainly part of the formula for wind chill, and not even fully agreed upon by every country, unlike the rate of thermal conduction itself.

AlColter Loc: Michigan

Heres what Wikipidia says is current:
North American and United Kingdom wind chill index
In November 2001, Canada, the United States, and the United Kingdom implemented a new wind chill index developed by scientists and medical experts on the Joint Action Group for Temperature Indices (JAG/TI).[5][6][7] It is determined by iterating a model of skin temperature under various wind speeds and temperatures using standard engineering correlations of wind speed and heat transfer rate. Heat transfer was calculated for a bare face in wind, facing the wind, while walking into it at 1.4 metres per second (5.0 km/h; 3.1 mph). The model corrects the officially measured wind speed to the wind speed at face height, assuming the person is in an open field.[8] The results of this model may be approximated, to within one degree, from the following formula:

The standard Wind Chill formula for Environment Canada is:

{\displaystyle T_{\mathrm {wc} }=13.12+0.6215T_{\mathrm {a} }-11.37v^{+0.16}+0.3965T_{\mathrm {a} }v^{+0.16}} {\displaystyle T_{\mathrm {wc} }=13.12+0.6215T_{\mathrm {a} }-11.37v^{+0.16}+0.3965T_{\mathrm {a} }v^{+0.16}}
where Twc is the wind chill index, based on the Celsius temperature scale; Ta is the air temperature in degrees Celsius; and v is the wind speed at 10 m (33 ft) standard anemometer height, in kilometres per hour.[9]
When the temperature is −20 °C (−4 °F) and the wind speed is 5 km/h (3.1 mph), the wind chill index is −24. If the temperature remains at −20 °C and the wind speed increases to 30 km/h (19 mph), the wind chill index falls to −33.

The equivalent formula in US customary units is:[10]

{\displaystyle T_{\mathrm {wc} }=35.74+0.6215T_{\mathrm {a} }-35.75v^{+0.16}+0.4275T_{\mathrm {a} }v^{+0.16}\,\!} {\displaystyle T_{\mathrm {wc} }=35.74+0.6215T_{\mathrm {a} }-35.75v^{+0.16}+0.4275T_{\mathrm {a} }v^{+0.16}\,\!}
where Twc is the wind chill index, based on the Fahrenheit scale; Ta is the air temperature in degrees Fahrenheit, and v is the wind speed in miles per hour.[11]
Windchill temperature is defined only for temperatures at or below 10 °C (50 °F) and wind speeds above 4.8 kilometres per hour (3.0 mph).[10]

As the air temperature falls, the chilling effect of any wind that is present increases. For example, a 16 km/h (9.9 mph) wind will lower the apparent temperature by a wider margin at an air temperature of −20 °C (−4 °F), than a wind of the same speed would if the air temperature were −10 °C (14 °F).

Graph of degrees of wind chill for wind speed and air temperature
Celsius wind chill index


Graph comparing "old" and "new" wind chill values by wind speed at 15°C air temperature
Comparison of old and new wind chill values at −15 °C (5 °F)


Picture of a manual wind chill calculator
Wind chill calculator

The 2001 WCET is a steady state calculation (except for the time to frostbite estimates).[12] There are significant time-dependent aspects to wind chill because cooling is most rapid at the start of any exposure, when the skin is still warm.

Pixelmaster Loc: New England

The reason that I posted the wind chill chart was because I know what it is like to deal with foul weather.
Cold can kill you or at the very least lead to loosing part of your anatomy. On the reverse side heat can lead to heat stroke. Photographers have to understand what they are up against. Dress for the weather and don't underestimate it.