Yep, wait till you're 70, like me and dig only on nice, sunny days. On the cold, damp, cloudy days when the ground is still frozen, sit at your computer, crank up FMDF and suggest things like this to get your metal detecting fix.
Seriously, if your joints are in such poor condition that you're in pain from just digging, just wait until your knees kick in from kneeling on the cold ground. Pennies, nickels and dimes are cool, but MDing into your senior years is cooler. My sugestion is to use your common sense...If God wanted you to dig on sub-zero days, He would have given you a set of claws to do it with. Since you apparently don't have digging claws I suggest you use the colder days to scope out new areas to dig when the weather improves. Driving around on the colder days minimizes traffic congestion and allows more opportunity to turn around or stop to check out a potential gold mine. Lower vegetation will also allow seeing old foundations, remains of paths and cellar holes which will be concealed once the grass and vines start growing again.
AT Pro/GPP/Fiskars Diggers/BH Outback/CT hand held