We used to just have two seasons:
1.) January 1-Thanksgiving: ride all the time
2.) Thanksgiving-January 1: There be monsters (shoppers rushing, drunks, drunk shoppers) aka roller season

The past five years or so we've added fire/smoke season. It hits at some random time between July and September. The logging roads are all closed and you don't want to ride out to them anyway because the air is toxic. We dodged the smoke almost completely this year in the Willamette Valley. (Points south weren't so lucky; I left NorCal as the County fire struck, and it was followed by the Mendocino complex shortly thereafter. And don't even mention the Rogue Valley; it was invisible under a cloud of smoke all summer.)

In spite of our awesome weather and luck with the smoke, I barely got 8000 miles in. I'm procrastinating on knee surgery (only a problem if I walk; I can ride all day, so what's the hurry?) and my spouse is procrastinating on a hip replacement, so we just didn't find as many tandem rides happening. We're hoping for more riding this year. We're locked into 50 miles per week with our granddaughters (the four-year-old rides eleven miles four days a week and we add the six-year-old for part of that), so we always get in the saddle at least a wee bit.