Welp, thanks to How can I deserialize JSON to a simple Dictionary<string,string> in ASP.NET? - this did give me a thought to try - Since each object is (literally) a key with a collection of key-value pairs, the following line successfully turns the JSON into a useable object -

var temp = JsonConvert.DeserializeObject<Dictionary<string, Dictionary<string, string>>>(sensorsJson);

This likely wouldn't work if the schema of the JSON was altered in any way, but in the above case, it certainly worked.