A few days ago Dave blogged here on the benefits of being able to pick and choose his time to photograph.
For me the opposite is true, with a full time job to fit around, I can only look out the train window to see beautiful sunrise, blues skies and sunsets between Monday and Friday. The last two weekends when I have been gagging to get out have been truly awful, with horrible dark grey light. I have a couple of local day trips that I want to get in but with the light it really just isn't worth the waste of very expensive fuel. So today will be another lost Sunday and fingers crossed for next week, and hope the fairly rare subjects I want to see will still be around.