Doesn't matter won't hurt you and won't hurt the gun so go for it!
You can play airsoft in any weather. Airsplat.com has Ghillie suits and vests to keep you warm in the cold so you can play airsoft at anytime of year. Check out Airsplat.com for airsoft accessories and guns.
It is legal, but you have to own the area. It is illegal to play airsoft on public property.
You should not need two jackets to play airsoft, one should be fine. It may sting a bit, but it is better than being sweaty and slow.
airsoft is more fun played both airsoft is more realistic
The cold will ruin a spring, but not a gas or electric.
You can only play airsoft on your property or with the owners permission.
Type recommended by the maker of the airsoft.
An Airsoft gun
If you play airsoft, then no. It should be a non-reflective colour that matches the area(s) you play in, to reduce the chance of being seen (green usually works best. If you do not play airsoft, paint it any colour you want. try to use krylon camouflage paint to use on your airsoft guns. See the link below
yes.
yes
It's depend on law which apply in your own country. First you have to make sure that airsoft is legal in your country. If it's legal, you should understand the rule correctly. You can play airsoft in an authorized area that is allowed by the rule (i.e you own house, private area, authorized airsoft field)