attributeAir TemperatureAttribute Error CheckAT set to missing if greater then 33.0ÿ° or less then -9.0ÿ°Daily AT changes greater then 5ÿ°C from previous day; daily AT - SST greater then 1.4ÿ°C;daily AT outside 6-32ÿ°C; hourly AT outside 15-33ÿ°C within past two weeks