I got
this one- when it was on sale for about $25. The forcasting isn't that accurate, but the temperature seems to be about right. For example last night with the wind howling it was showing rapid changes in the .1 to .3 degree range; what I would expect to see.
But for me being over 30 km from the airport it is handy to know that even though it was -5 there it may have been -15 by my place. It also has high/low temps that you can reset; so you know if there was frost overnight or not.
The one knock against this one; it only allows for 1 external temperature sensor. It might be handy to also know what the temperature is in the garage, or next year when I might build a greenhouse.