Sometimes it happens also to my Jazz, both in cold and hot weather.
When you push the start button or you turn the key in start position, the ECU performs a brief check, if all important circuits are ok it gives power to the starter motor; then, when shafts start rotating, a sensor has to detect dead centers position, another the "zero position" of the camshaft (we have the i-vtec, so angles can vary), another the oil pressure, another the fuel pressure and so on, then the ecu can start powering spark plugs and fuel injectors in the exact moment. Most of the times this process is very quick, so you push the button and the engine starts immediately. Sometimes the dead center missing tooth (cog?) has to pass more than one or two times n front of the sensor to be detected (dust, low speed, ...), or the fuel pump needs more time to reach the working pressure, or others... so the start process could need a little more time.
I'm not worried about it.