31.6 is the width in inches, 16 is the rim diameter in inches.
To get the overall height you need the aspect ratio which isn't given on most standard tires. If the aspect ratio was 75 then you could compute the tire diameter by 31.6x.75= 23.7". Multiply that by two and add to the rim diameter to get the overall diameter, in this example it would be 63.4" which is probably taller than what you really have. Being a turf tire the aspect ratio could even be as low as 50% (which would give a tire about 48" tall.) The other way to do it is take your tire size and go to the manufacturers website and look up the tire dimensions.