How to obtain data specifing the Units

[ribeirodanielf]

Is there a way to set the Units on the JSON?
I need to return Temperature in Celsius, for instance.

{
"lat": xxx,
"lon": yyy,
"model": "gfs",
"parameters": ["temp", "rh", "precip", "convPrecip", "snowPrecip","ptype", "lclouds", "mclouds", "hclouds"],
"levels": ["surface"],
"key": "zzzzzzzzzzzzzzz"
}