I like the LaCrosse clocks with indoor/outdoor temps. I have 2 of them. One runs strictly on battery power and last about a yr. The other has a wall-wart with battery backup. They both pickup time signal via radio waves and are very accurate.
I like the wall-wart model the best. It has humidity levels and a indicator as to barometer rising/falling. It has brightness adjustment for easy viewing or dimmed at night. The battery model is a LCD. They have various model and usually can be bought for under $30. I think mine were under $20.
Added thought, the remote temp can be used to monitor fridge or a compartment temp.