Casting outside in winter

Warmer boots and coat. I do most of my casting in the winter and don't do anything different other than to make sure no snow hits the pot. Pre-heat any ingots to get the moisture out before dropping them in the pot.
 
If you are using a bare pot (not insulated) the wind is not your friend. Lead can turn solid at the sides of the pot and as you are trying to pour. You need a good heat source. Last winter I was doing it on a propane heater with a stainless steel pot and there were far too many rejects. Since then I have purchased a proper lead pot so hopefully things will go smoother. A windbreak is a big help if you are exposed to the wind.
 
I cast all winter in a detached garage. I usually have to turn the temperature up maybe 10% to get the same good results but have never had a problem.

Just don't bother dropping cast bullets into snow. It is too hard and can put dents in the soft bullets. They also tend to melt part way through the snow, stop, and then the other bullets just land on top of them eventually (when there are enough.) Water dropping I get 1-2 out of every 50 that is bad and gets remelted. When dropping in snow it was practically half of them.
 
I use a 20# Lee Magnum Melter and I find that I must turn down the temperature when used in winter. I think it has something to do with its temperature sensor thinking the lead is cooler than it really is due to the ambient freezing air cooling down the external shell of the pot where the sensor is. I put the temp at "3" when it's really cold like -10, and during summer it can be as high as "6" setting.

I've cast during light flurries before, and the snowflakes just burned off when they hit the surface of the lead no problem. Your molds will cool more quickly if you're alternating between two, so you'll have to factor that into your pacing.

Avoid the temptation to do it inside an enclosed space without adequate ventilation just because it's cold. Just dress for the weather.

Edit: Oh yeah, I almost forgot. BEWARE of adding new ingots into your pot that you've stored at the same freezing temperatures. They might have frost on them. Don't ask me how I know this.
 
I did it last winter.My hands froze much faster than anything else since I cant feel much in my fingers with gloves on (nerve damage,long story).

I'm much better off casting a lot in September and October to get me thru the winter.
 
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