Pilot reported on takeoff the elevator was marginally controllable which resulted in rejected take off. Reporter stated the aircraft had sat for two weeks in freezing conditions.

Narrative

Taking off of an icy runway in IFR conditions with malfunctioning flight controls. to safely abort the takeoff. maintained directional control by slowly reducing power through the various gates all the way to reverse with little brake use until the very end. the flight controls were malfunctioning; so I chose to abort the takeoffI became aware that there was a flight control malfunction when I pulled on the yoke to rotate; but the plane refused to takeoff.I believe there to be a frozen connection between the yoke and the elevator. The airplane sat on the ramp for over two weeks with its last flight on Date. All the while; moisture and below freezing temperatures did their worst.The aircraft stayed stationary for over two weeks completely exposed to the harsh ZZZ winter elements. Utilizing the aircraft more could have prevented this issue. It could be also said that this issue could have been noticed during taxi flows/checklist. However; with the aircraft being new to me; I thought that everything was normal for the aircraft. I should have terminated the flight at the taxi flows/checklist; but again I thought this was normal. The control lock was removed; therefore the yoke should move freely about.