Very short battery life
My AcuRite 02032 outdoor sensor has started to use batteries about every month.
The issue is with the temperature sensor board...it wears out over time. It will drain batteries in a few days. Fortunately, Acurite sells a replacement board “AcuRite Iris (5-in-1) Temperature and Humidity Sensor Replacement” it is a cheap fix ~$13 + shipping. I changed my board out about 2 years ago and it's been working fine.
Here's a link to order the part from Acurite:
They will include the documentation on how to replace the board - it's a phillips screwdriver to open the sensor and the board simply unplugs.
I've had to replace a couple parts on the sensor - the top fan also stopped working, this makes the temperature read higher than what it actually is.
Overall, I've put $40 in replacement parts into the outdoor sensor, and I expect to get at least a few more years from it (the full replacement sensor is ~$100).
I have to give Acurite some props, they really make the sensor VERY repairable.