Blackbody uses Kelvin temperature to determine color, the  lower the temperature, the warmer the color.  So, if you want to emulate a candle flame, use a temperature between 1000 and 1900 degrees.  Sunset/sunrise use 3000 to 3600.  Even though this feature is beneficial with the emission node for mesh light, it really has enormous potential when connected to an actual light.  If you light an outdoor scene, use the Blackbody node with the Infinite light to enhance and tint the lighting with a more corrective emission value than just guessing the color.