Two remote sensors, one for inside my greenhouse, one for outside.
Monitoring station in my back window about 50 feet from the greenhouse, line of sight is clear of obstructions.
Date logging of min/max temps and humidity of both remotes for up to two weeks. (that's the big requirement)

If the remotes have their own displays of current conditions, that'd be nice, but not critical.

I don't really need rain gauges, wind speed, barometric pressure and such. It's nice stuff, but the min/max humidity logging is a must.

I just want to protect my tropical plants on the few nights we get freezes here in New Orleans.

For simpler systems try Oregon Scientific

I've been very happy with the Davis Vantage Pro wireless.

For data logging, I might look at the Model # WMR200A. According to its manual, even at 1 minute data intervals it can store 19 days of data, and then download via USB to a computer. At 15-minute data intervals it can store 291 days.

It's a nice way to monitor what's happening in the greenhouse. I also use this to calculate my heating costs and to adjust the set point of my fans.

It's a bit of overkill but I had an old laptop and the sensor was cheap.

Gary