Fuel EX 9.8. Mostly cloudy at the start (and threatening rain) but it cleared somewhat and there was some sunshine for the last half of the ride. Cool temperatures and high humidity, no noticeable winds. We had a surprise thunderstorm cell in Geneva, heavy rain for only 20 minutes around 4:30 am. That ruined any riding opportunities in the Chicagoland area and scrubbed my planned trip up to Silver Lake Park in Wisconsin. There were more than the usual other riders out today, probably because I got a later start with a +10:00 am roll time. We are definitely moving into Fall weather with leaves steadily falling and many sections of trail totally covered. This makes for some potentially treacherous riding with the leaves covering up roots, rocks, sticks and especially walnuts. I had to take it slower than usual in several areas. Did a little bit different course selection this trip: After 2 trips around the Founder's Loop for a warmup, I headed across the River to the East trails and this time did 2 complete loops on all trails, once in each direction. Then the usual Marsh trail 2 more trips around Founder's, the Prairie and 2 full loops around Big Wheel, so lot's of climbing this trip.