The standard deviation is a measure of spread around the mean, so it's often not meaningful to compare one with the other. For example, in some northern latitude the average winter temperature may be 0°C, while the standard deviation could be several degrees. But 0°C is 32°F, so the standard deviation (in °F) would appear greater in °F than it would in °C, and the mean is clearly entirely different. In °K (Kelvin or absolute), 0°C is 273°K and the standard deviation would be the same as for °C because the measurement of one degree is the same in both temperature systems.