The Digilent Pmod HYGRO (Revision A) is a relative humidity sensor with an integrated temperature sensor for highly accurate measurements at low power. With the TI HDC1080, you can determine the relative humidity of the environment with up to 14 bits of resolution.
For helpful side calculations, you can use a psychometric chart. You can learn how to use one here.
An alternate psychrometric chart that shows a range of typical comfort zones, but does not extend as far as the initial psychrometric chart is available here.