I should warn anyone that if Radar Sal is supporting and you're entrusting your nearest and dearest to her, that they should start training now. Get comfortable shoes, learn the Metro map off by heart, brush up on the French for 'let me through, I have important runners to support!' and practise their flag waving skills.
Heidi - it's a tricky balance to get right. Yes, it's normal to feel exhausted at this point because this is where the really heavy training kicks in and you've already got miles in your legs. If you can push through you'll get a considerable mental boost on the day from knowing you did all these runs when it felt really hard and you didn't want to go out.
That said, you don't want to be pushing yourself to the point of total collapse. Make sure you're eating enough (including plenty of protein which will help you feel fuller and rebuild muscles) and sleeping enough (you will need more sleep than usual). But if you really, really feel exhausted and worn out maybe you do need a bit of a rest. Check your resting pulse rate too. If it's higher than normal, you may be going down with a bug.
Heilan Coo? Another recruit for the Caledonian Massive, by any chance?
Weatherwise, it does vary. There have been a few quite warm years (and one very hot one) but it can also be quite chilly, especially hanging around in the start pens. Generally, expect slightly warmer weather than you've been training in (especially if you're in the frozen north).
Tried out the knee last night - quad still a bit tender where the massage lady got her thumbs in, but the knee itself was OK. Will drop the speed work this week and see how it goes.