In the UK is has done nothing but rain this year. I have done most of my advanced training in the rain, much of it on twisty roads and at high speeds, and you would be surprised how much traction bikes have in the wet. Good choice of tyres helps.
I tend to ride a BMW R1100S in wet weather, but routinely ride any bike, superbikes included, in the rain.
Donlt scare yourself, get some training if that will help your skills and confidence (it did mine).
I would not ride in icy conditions or on snow.