Extreme Minimum Design Temperature for a location.

    Degrees in Celcius

    Args:
        station_code (str): Weather Station Code

    Returns:
        float degrees Celcius

def minimum(station_code):
    """Extreme Minimum Design Temperature for a location.

    Degrees in Celcius

    Args:
        station_code (str): Weather Station Code

    Returns:
        float degrees Celcius
    """
    temp = None
    fin = None
    try:
        fin = open('%s/%s' % (env.WEATHER_DATA_PATH,
                              _basename(station_code, 'ddy')))
    except IOError:
        logger.info("File not found")
        download_extract(_eere_url(station_code))
        fin = open('%s/%s' % (env.WEATHER_DATA_PATH,
                              _basename(station_code, 'ddy')))
    for line in fin:
        value = re.search('Max Drybulb=(-?\\d+\\.\\d*)', line)
        if value:
            temp = float(value.groups()[0])
    if not temp:
        try:
            fin = open('%s/%s' % (env.WEATHER_DATA_PATH,
                                  _basename(station_code, 'stat')))
            for line in fin:
                if line.find('Minimum Dry Bulb') is not -1:
                    return float(line[37:-1].split('\xb0')[0])
        except IOError:
            pass
    if temp:
        return temp
    else:
        raise Exception("Error: Minimum Temperature not found")