Color Temperture in Kelvin
Degrees Kelvin Light Source
1700-1800K Match Flame
1850-1930K Candle Flame
2000-3000K Sun: At Sunrise/Sunset
2500-2900K Household Tungsten Lamp
3000K Tungsten Lamp 500-1000W
3200-3500K Quartz Lamp
3200-7500K Fluorescent Lamp
3275-K Tungsten Lamp 2K
3380K Tungsten Lamp 5K-10K
5000-5400K Sun: Direct Noon
5500-6500K Daylight (Sun+Sky)
5500-6500K Sun: Through Clouds/Haze
6000-7500K Sky: Overcast
6500K RGB: Monitor (White Point)
7000-8000K Outdoor Shade Areas
8000-10000K Sky: Partly Cloudy
So, why do we measure the hue of the light as a "temperature"?  This was started in the late 1800s, when the British physicist William Kelvin heated a block of carbon.  It glowed in the heat, producing a range of different colors at different temperatures.  The black cube first produced a dim red light, increasing to a brighter yellow as the temperature went up, and eventually produced a bright blue-white glow at the highest temperatures.  In his honor, Color Temperatures are measured in degrees Kelvin, which are a variation on Centigrade degrees.  Instead of starting at the temperature water freezes, the Kelvin scale starts at "absolute zero," which is -273 Centigrade.  (Subtract 273 from a Kelvin temperature, and you get the equivalent in Centigrade.)  However, the color temperatures attributed to different types of lights are correlated based on visible colors matching a standard black body, and are not the actual temperature at which a filament burns.