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someday

how cold is it at altitude?

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What I've heard is a -3F degrees decrease for every 1,000 feet.... highly subjective since you can go through a couple of colder/hotter air layers through your skydive....

Assuming -3F for 1K feet and using San Diego's daytime high of 72F, that's 42F at 10,000k feet AGL and around 30F (just below freezing) at 14,000 ft.
Y yo, pa' vivir con miedo, prefiero morir sonriendo, con el recuerdo vivo".
- Ruben Blades, "Adan Garcia"

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Check out temperature lapse rate.

Standard is: Subtract 3.6 degrees F (2 degrees C) for every 1,000 feet you go up in altitude. However, due to thermal inversions, weather patterns, etc... it's not always gonna be exact.

So, if your surface temp is....let's say 70. You climb from Sea Level pressure to 10,000 feet above ground. 3.6 x 10 = 36 - 70 = 34 F

I have seen 90F on the ground and 38F going up to 10K. So, it's definitely not always gonna be standard.


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The standard adiabatic lapse rate is 3.3F or 2C loss for every 1000 feet of altitude.

Given a standard day at 59F or 15C, the calculation is simple.

At 15,000 AGL x 2C = 30C loss or -15C at altitude

At 15,000 AGL x 3.3F = 49.5F loss or +9.5F at altitude

Sometimes temperature inversions are present and could affect the temperature.:)

People are crazy. Cuz there's more of 'em.

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If it is colder than -10C I don't like jumping in sandals.



Lemme guess, you put socks AND your sandals on then go jump right? :D:P


Also don't forget about the wind chill factor if you want to get down to the brass tacks.
"It's just skydiving..additional drama is not required"
Some people dream about flying, I live my dream
SKYMONKEY PUBLISHING

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Yikes, I usually find myself looking at the thermometer in the pilots cabin to find the freezing point (south of Atlanta Ga, in the winter is usually around 10,000ft, so take another -12F at jump run)... and that's for a hop-and-pop at altitude ..... I've done jump runs at 14,500ft with -20F and 70mph winds at altitude.....(of course, that's a full free fall and nut sack up through the Adam's apple)
Y yo, pa' vivir con miedo, prefiero morir sonriendo, con el recuerdo vivo".
- Ruben Blades, "Adan Garcia"

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Probably in the neighborhood of 10* C this time of year at 13k here in SD.

If you really want to know, go here http://www.aviationweather.gov/products/nws/winds/?area=sanfrancisco&fint=06&lvl=lo and follow the grid to SAN and 12k - the number will look something like this: 1907+11, which indicates winds at the altitude as 190 @ 7 knots, temp 11*C. Subtract a few degrees since we're jumping at 13.5k (Winds aloft number are MSL, we jump 13k AGL + appx field elev. of 500 ft)

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Lemme guess, you put socks AND your sandals on then go jump right? :D:P


Actually I was doing that in Eloy a couple of Decembers ago and got told in no uncertain terms how uncool that was.:|



HAHA, That was you? J/K But I do remember seeing that:D
"It's just skydiving..additional drama is not required"
Some people dream about flying, I live my dream
SKYMONKEY PUBLISHING

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It actually does not FEEL as cold when you get out as the airplane's thermometer says. It has something to do with the fact that I wear full cold weather gear in winter and you just aren't up in the really cold air all that long. I have seen -5 F on the outside air temp guage in the cockpit of the Mile High T Otter at 13,500 AGL many times.
Kind of like running outside to your car in a t shirt and shorts in the dead of winter to get something. You just aren't out in the cold very long.
IMO You will be able to handle it just fine. ESPECIALLY in San Diego. Come jump in Colorado in January for some COLD FUN.

Just burning a hole in the sky.....

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someone told me in New Zealand
at 15,000 it was -22 celcius (+ or - flux with seasons)



i have jumped in -27C at 1500 in queenstown new Zealand, that was not the coldest it has been either.

Now that i live in the tropics I feel colder at 0degC than than i did back then though.
"When the power of love overcomes the love of power, then the world will see peace." - 'Jimi' Hendrix

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