I had purchased a previous Acurite wireless weather station that had a sensor failure after about two years of use. It was fairly accurate, so I decided to try another Acurite unit. This new weather station worked fine for about one week. During that week, outside temp ranged from about 40 deg to about 75 deg. Station outside readings seemed to be reasonable accurate (within about 2-3 degrees). Although indoor readings were about 3 or 4 degrees higher than a nearby mercury thermometer.
Then one morning clock and temp readings all remained frozen and unchanged from the previous afternoon. Pressing high or low buttons produced no change in the display. Removed batteries. Batteries checked ok. Replaced batteries. Restarted station. Sensor unit was still transmitting, and everything appeared normal again. However, outside air temp was now reaching low 80 degrees in the afternoon. Now, station temp readings were much higher than actual. Example: at 83 degrees outside temp (verified by two outside mercury thermometers placed at same location, and local weather station), the station outside temp reading was 98 degrees! Also, station inside temp reading was 81 deg., while inside temp was actually 73 deg. At lower temp, the outside readings seemed much closer to actual, but I did not verify this with actual measurements.
I am now looking for a new wireless weather station.