asp.net HTTP Client get with query string

Developed in an asp.net mvc I intend to implement an HTTP request that with this part of the code the meteorologies present me a "list" with the metrics of the query data_de_leitura=2016-11-11&hora_de_leitura={null} ie 3 meteorologies for the query that is added to the url example:

api/Metereologias?data_de_leitura=2016-11-11&hora_de_leitura={null}

The result obtained regardless of the date and time value is always the same, all the weather of the api url.

var client = WebApiHttpClient.GetClient();
string path = "api/Metereologias?data_de_leitura=" + data + "hora_de_leitura=" + hora;
HttpResponseMessage response = await client.GetAsync(path);
if (response.IsSuccessStatusCode)
{
    string content = await response.Content.ReadAsStringAsync();
    var metereologias =
    JsonConvert.DeserializeObject<IEnumerable<MetereologiaDTO>>(content);
    await GetPois();

    return View(metereologias);

On the api side, you have a method in the controller to handle this data

public List<MetereologiaDTO> GetMetereologiasSearchDataeHora(string data_de_leitura, string hora_de_leitura)
    {
        List<MetereologiaDTO> result = new List<MetereologiaDTO>();

        result = verificarData(result, data_de_leitura);
        result = verificarHora(result, hora_de_leitura);

        return result;
    }