@3KillerBs has covered it but to amplify - your coop is barely sufficient for the four birds you have except when you have snow on the ground. If you have extended periods you will have stress issues.
Given the date I would focus on getting a roof on the run so that it remains available. Does not have to be elaborate, a tarp in a steep V (say over a pole/beam several feet above the top of the run) and attached to the run sides would work; extend one side to provide a wind break (north side?) would finish things nicely.
Given the date I would focus on getting a roof on the run so that it remains available. Does not have to be elaborate, a tarp in a steep V (say over a pole/beam several feet above the top of the run) and attached to the run sides would work; extend one side to provide a wind break (north side?) would finish things nicely.