Wind chill

[Mom]

Well this has been informative. I learned heaps Hopefully others did too

[Katman]

So at 20 degrees air temp, I am feeling 8 degrees of air temp through my partially unzipped jacket while travelling at 100 kph? How the hell do I not freeze (figuratively of course)? 8 degrees is cold, I have never felt cold in the summer time. I love the "wind chill" then.

At 20 degC travelling at 100kph it would feel like 18.3 degC.

(As long as there was no tail or head wind to factor in).

Whereas at 35 degC it would feel like 40 degC.

[marty]

Wind chill at 100kph would be roughly 4 degrees so that means the air hitting your face feels like it is 4 degrees

i don't understand your reasoning.

the graph is in degrees F and only goes to +40 F,- which is only +4 C. Shows that at 100km/h, in +4 C, the wind chill experienced on exposed skin takes 15 F off the actual temp, taking the 'feels like' temp down to +25 F, or -3 C.

and yes - 100km/h on your bike is the same as standing in a 100km/h wind.

wind chill is a major factor in skydiving in the winter - it can be -20C out the door, at 120mph, minus wind chill factor, the temp feels like -40/-50 C and colder. Can be difficult to feel for the droge chute ball if your hands are frozen

[oldrider]

When you eventually come down to a Brass Monkey and strike a "really cold one" you will probably feel it (wind chill) to the full!

It's probably about as bad as it (wind chill) gets for motorcycling in New Zealand too!

Leaving the warmer areas at minus 10 to 12 degrees Celsius and then getting into the "cold spots", say in the Lindis Pass for instance, can really test your mettle.

If there is hoar frost lurking about, temperatures really plummet as you negotiate the slippery icy bits of the road.

You can't stop because you would become a hazard or target for other road users to hit. (the bastards will hit you too, if you are not careful)

Of course the more you move and the faster you go the colder it gets!

It is the wind chill that makes the difference, I have seen many a grown man in tears from the cold!

I feel sorry for the Northern riders, because they are not acclimatised for the lower temperatures on the way down, it just gets colder and colder and colder!

Must feel good heading home though.

Ophir (near the Brass site) is supposed to be the coldest "official" recorded temp in NZ, that was 3 July 1995 minus 21.6 Celsius.

As you can see from the date, close to or on Queens birthday week end and the Brass Monkey rally!

That would be as good as it gets for wind chill experience for any motorcyclist in New Zealand!

Come on down an enjoy the experience, you might be lucky and get a cold one!

[Katman]

Come on down an enjoy the experience, you might be lucky and get a cold one!

You're not a very good salesman.

[psycho22]

i don't understand your reasoning.

the graph is in degrees F and only goes to +40 F,- which is only +4 C. Shows that at 100km/h, in +4 C, the wind chill experienced on exposed skin takes 15 F off the actual temp, taking the 'feels like' temp down to +25 F, or -3 C.

and yes - 100km/h on your bike is the same as standing in a 100km/h wind.

wind chill is a major factor in skydiving in the winter - it can be -20C out the door, at 120mph, minus wind chill factor, the temp feels like -40/-50 C and colder. Can be difficult to feel for the droge chute ball if your hands are frozen

I know I used an online calculator for that one ( Not Steves one ) and it didn't sound right. You don't know what you can trust online. My apologies.

Use Steves one at least it's accurate

[10bikekid]

Don't know how accurate this is but we always say that the wind chill in the winter is about -10 deg at 100kph eg 14 deg at 100kph = 4 deg , you got to remember that with all your gear and helmet on you usually cook when you stop if the temps over 17 deg so its probably not far wrong

I rode from Whangamata to Auckland on Sat at o let say 12 deg and even with liners in my gloves most of my fingers went white

[marty]

as a guide, that would be pretty accurate. the colder the ambient though, the greater the split

[10bikekid]

this was the best chart I could find

Temperature
(°C)
Wind Speed in Kilometres per Hour (kph)
0 10 20 30 40 50 60 70 80

20 19 16 15 14 13 13 13 13
15 13 10 8 7 6 5 5 5
10 8 4 1 -1 -2 -2 -3 -3
5 2 -3 -6 -8 -9 -10 -11 -11
0 -3 -9 -13 -15 -17 -18 -18 -19

-5 -8 -15 -20 -22 -24 -25 -26 -27
-10 -14 -22 -27 -30 -32 -33 -34 -34
-15 -19 -28 -34 -37 -39 -41 -42 -42
-20 -25 -35 -40 -44 -47 -48 -49 -50
-25 -30 -41 -47 -51 -54 -56 -57 -58

-30 -36 -47 -54 -59 -62 -64 -65 -66
-35 -41 -54 -61 -66 -69 -71 -73 -73
-40 -47 -60 -68 -73 -77 -79 -81 -81
-45 -52 -66 -75 -81 -84 -87 -88 -89
-50 -58 -73 -82 -88 -92 -94 -96 -97

that didn't come out so well did it but it looks like once your speed gets over 60 kph the change isn't great so in brief where looking at say a 10 deg reduction at 15 deg ambient, 19deg reduction at 0 and a 7deg reduction at 20

[Mom]

Come on down an enjoy the experience, you might be lucky and get a cold one!

Brrrrrrrr. You can keep that. I am a hot house flower me, anything short of tropical temps and I am freezing.

We dont wear enough clothing up here, we dont really need to, so it is easy to get caught out with the cold. A few weekends ago I went to visit a friend about an hour north of here. It was a beautiful sunny day, I was in a t-shirt at home. I considred putting my thermals on to ride up there, but did not bother, short ride, lovely day and all that. My jacket has a quilted thermal liner in it so I should be ok? Boy did I regret it half an hour into the trip. Anyplace the sun was not, was bloody cold.

I dont get cold on my bike generally, I resemble a pass the parcel package when I am all geared up, layer upon layer of yummy warmth

[Goblin]

I feel sorry for the Northern riders, because they are not acclimatised for the lower temperatures on the way down, it just gets colder and colder and colder!

Awww go on with ya! There's at least 2 of us who are hard enuff. We get to acclimatise through Reporoa/Broadlands fog.

[MSTRS:Me]

If you have a glass of water outside, ambient temperature +2 degrees C, the wind is 20 knots.

That's some serious wind chill.

Will the water freeze?

Nope. It can't get colder than the ambient temperature.
Wind chill is the perceived temp for a living being.

[oldrider]

Awww go on with ya! There's at least 2 of us who are hard enuff. We get to acclimatise through Reporoa/Broadlands fog.

Hey, don't break the myth, I want to think I feel warmer as I go further North!

[oldrider]

Brrrrrrrr. You can keep that. I am a hot house flower me, anything short of tropical temps and I am freezing.

I dont get cold on my bike generally, I resemble a pass the parcel package when I am all geared up, layer upon layer of yummy warmth

HHhhmmmm, I guess Maha was left holding the "pass parcel package" when the music stopped then!

[davebullet]

As I said, it depends on the ambient temperature.

Over a certain temperature the wind actually incurs a heat factor.

The concorde would lengthen by upto 30cm at supersonic speeds due friction induced heat due to the windspeed. Even though it is bloody cold up there.

Could be handy to lengthen things down here as well with a bit of friction... but sadly... I cannot rub fast enough.