I can really feel the heat island effect on my morning ride. Lately I'll ride from my house in Curtis Park, through Midtown and Downtown to drop off my bag at my bike locker, then meet my buddy at the American River Bike Trail for a pre-work ride.

When I left the house the thermometer showed 48F. When I got to the parking structure, it felt considerably warmer (more asphalt, fewer trees). Then to the River, where there was a cold mist over the water and trail. It's weird and cool to pass through those micro climates.

Not something you'd notice riding in your car, that's for sure.