Every year about this time, early winter, I start to get knee pain. I'm in CA so I rarely ride in temps below the mid 40's but I can't help but wonder if it's temperature related.

I wear knee warmers on top of leggings, start out slow, foam roll and stretch after each ride, hot showers or baths, etc... and I'm only 29 years old. I take glucosamine and fish oil daily as well. Is there anything I'm missing? I've only been riding a few years but it seems to be this time of year always.