{
    "ads": false,
    "ad_uses": 15,
    "api_key": "",
    "server": "http://api.wolframalpha.com/v2/query",
    "default_ip": "192.168.0.1",
    "scan_timeout": "",
    "pod_timeout": "",
    "format_timeout": ""
}

{
    "ads": false,
    "ad_uses": 15,
    "api_key": "",
    "server": "http://api.wolframalpha.com/v2/query",
    "default_ip": "192.168.0.1",
    "default_units": "nonmetric",
    "scan_timeout": "",
    "pod_timeout": "",
    "format_timeout": ""
}

Update W|A plugin config file
Update W|A plugin config file

Forgot to add this entry. Default is US standard units.