Wind speed and wind turbulence aren't the same thing.
A steady 20mph wind is easier to maintain position than a 10mph turbulent wind.
Turbulence requires more adjustments per second.
I think you’re both right. It’s been my experience that there’s GENERALLY more wind at higher altitudes, but obstacles on the ground (like buildings etc.) can cause turbulence. Have a great day and fly safe.
If you are buying silica gel desiccant try to get the sort that is self indicating. This normally changes color dependant on moisture content. Then you just pop it into and warm electric oven at 110°C or microwave to drive off the captured...
You've covered pretty much all the bases already, the only thing I'd add is... lens fogging.
With the smaller drones in particular, you can end up with condensation between the actual lens element and the 'glass' fitted into the front part of...
I wouldn't rule out cold days entirely. There are folks on the forum who fly actively in Alaska and similar climates throughout the year. Just watch for periods when the wet-bulb temperature is near the dry-bulb temperature, i.e. very high...