Last fall as I was departing Reno, NV (KRNO), the weather was 1500 overcast (6000 MSL), tops 10,000 MSL, surface temp +10 C and there was no precipitation. I was flying my pressurized, turbocharged, FIKI-certified Cessna 414. Id flight planned for FL 190. I hand flew the departure because that is recommended when potential icing conditions exist. In the climb I noticed light rime ice on the leading edges of the wings. I was watching carefully for decreasing performance (airspeed, rate of climb, etc.) and all seemed quite normal.