AcuRite Atlas sensor:

1. Temperature: +/- 1 degree Fahrenheit.
2. Humidity: +/- 2% Relative Humidity.
3. Rain: +/- 5%.
4. Wind Speed: +/- 1 mph < 10 mph, +/- 10% > 10 mph. 
5. Wind Direction: +/- 3 degrees.
6. UV Accuracy: +/- 1.
7. Barometric Pressure: +/- .15 inhg.

5-in-1, 3-in-1 and Tower sensors: 

1. Temperature: +/- 2 degrees Fahrenheit.
2. Humidity: 
   1. +/- 5% from 0% to 10% Relative Humidity.
   2. +/- 4% from 10% to 20% Relative Humidity. 
   3. +/- 3% from 20% to 80% Relative Humidity. 
   4. +/- 4% from 80% to 90% Relative Humidity.
   5. +/- 5% from 90% to 100% Relative Humidity.
3. Rain: +/- 0.05" per inch of rainfall.
4. Wind Speed:
   
   1. +/-2 mph below 10 mph. 
   2. +/- 3 mph from 10 to 30 mph.
   3. +/- 4 mph from 30 to 50 mph.
   4. +/- 5 mph from 50 to 99 mph.
5. Barometric Pressure: +/- .15 inhg. 

Pro Accuracy Units:

1. Temperature: +/- 0.5 degrees Fahrenheit. 
2. Humidity: +/- 2% Relative Humidity.