def build_url(param_dict):
    """
    Builds the URL needed to query [University of Wyoming, College of Engineering, Department of Atmospheric Science's website](http://weather.uwyo.edu/upperair/sounding.html) to get the proper sounding data.
    
    Parameters
    ----------
    param_dict : dict
        A dictionary containing the station number, year, month, and day/hour of the desired date and location.
    
    Returns
    -------
    full_url : string
        String of the query URL with the proper date and location of the desired atmospheric sounding.
    """
    
    base_url = 'http://weather.uwyo.edu/cgi-bin/sounding?TYPE=TEXT%3ALIST'

    full_url = base_url
    for key in param_dict.keys():
        full_url += '&' + key + '=' + param_dict[key]

    return full_url