The right temperature for lead-free soldering?

I have a big reel of leaded solder that I bought in 1980 for what seemed like a huge amount of money at the time. Its getting pretty thin now. But I do find it just so much easier than the lead-free variety.

Given that my last reel of solder has lasted me 30 years, I don't feel too 'un-green'.

You can still buy leaded solder - CPC in the UK sell it, and would hope most of the big components suppliers will sell it too.