#Bike Time Trial
Skip the weather, use a training device. Doesn't matter if it's old or new, roller or fluid, so long as it works. Any trainer will work.
You'll need a speed meter and a timer. Cadence meters are very useful and can also make this task more interesting.
If you don't have a cadence meter, or you don't want to buy one, use an online calculator tuned with your bike measurements against the speed graph. This will give you a rough speed/cadence table to work with.
The trial is to match cadence with duration for repetitions. You will allow you to get some good milage in while keeping yourself preoccupied from thinking about distance.