Like the FBI, to be certain, you re better off to collect a dossier of reports. Naturally, if turbulence or icing is forecast and somebody verifies it, that is a mandate to gather more information before putting the flight in a compromising situation. The type of aircraft making the report is also a factor. If an airliner reports moderate turbulence or light icing, figure that conditions will not be suitable for a light aircraft. Highly wing-loaded aircraft ride better in turbulence, and if a Boeing is having a bouncy day, your ride will probably be terrible.
Airliners also move faster and climb better, which tends to minimize ice.
One inexplicable thing I ve always noticed about ice is that it is seldom as troublesome when the aircraft has full deice equipment. No deice equipment and it is just enamored with the aircraft hmmm. The most valuable reports, naturally, are from aircraft that are similar in size to yours and are flying along the same route. A few reports can make your decision much easier. If that s the way you have to go, wait until the wind subsides or buy a ticket.