No offence to anyone, but Dew Point reports to 0.1deg, especially in F, are really displaying that the user doesn't understand what they're reporting (that is, if the software in use allows any control over the reported precision). Dew points are calculated from temperature and RH, each of which has their own error - these errors compound up when calculating dewpoint and the resulting values are typically not accurate to better than 1-2°F, if that. So the decimal part of any such dewpoint value is essentially meaningless.