curl --request GET \
  --url https://api.voltview.co.uk/v1/sites/{siteId}/degreeDays \
  --header 'x-api-key: <api-key>'

{
  "siteId": "<string>",
  "period": {
    "from": "2023-12-25",
    "to": "2023-12-25"
  },
  "heatingDegreeDays": 123,
  "coolingDegreeDays": 123,
  "data": [
    {
      "date": "2023-12-25",
      "hdd": 123,
      "cdd": 123,
      "avgTemp": 123
    }
  ]
}