def colormap(temp):
    if temp <0.0:
        return 'white'
    elif 0.0 <= temp < 5.0:
        return 'violet'
    elif 5.0 <= temp < 10.0:
        return 'dark blue'
    elif 10.0 <= temp < 15.0:
        return 'sky blue'
    else:
        return 'green'