The temperature at noon in Oakdale was -7 degrees Fahrenheit.
If the temperature in Oakdale was negative 4 degrees Fahrenheit in the morning, and it dropped another 3 degrees Fahrenheit due to strong winds by noon, you would add the two values to find the temperature at noon.
Negative 4 degrees Fahrenheit (morning temperature) + Negative 3 degrees Fahrenheit (temperature drop) = Negative 7 degrees Fahrenheit
Therefore, the temperature at noon in Oakdale was -7 degrees Fahrenheit.