Go to a Butchers supplies store and buy one of those huge walk in fridges they use to store their meat carcaases. Carpet it, hang wallpaper, a nice little 2 seater couch and hey it's winter.
In winter, buy 6 months supply of daily newspapers. In summer, pay a local schoolkid to post them through your front door on a daily basis - this will trick your mind into thinking it's winter. (Probably)
When you go out in summer, wear very dark wrap around glasses and a thick coat.
Hire an industrial strength snow making machine like they use on film sets. This might be expensive, but you could charge the local kids £1 a day entrance into your garden so they could build snowmen in summer.
If you can't afford a snow making machine, spray the insides of your window with snow in a can, buy lots of cotton wool and attach it to the tops of branches, garage roof etc just outside your house.
Buy 47 x 250gb Hard drive DVD recorders and record 6 months of winter TV. Play it back in summer when normal TV is krap.
Stop winter birds migrating by stapling their feet to your garden fence.
I'm bored now