In terms of precipitation, rainfall in Stephenville ranges from 3.1 - 5.1 inches per month. August is typically the wettest month, when rainfall can reach 5.1 in. April is typically the driest time to visit Stephenville when rainfall is around 3.1 in.
If weather is an important factor for your trip to Stephenville, use this chart to help with planning. For those seeking warmer temperatures, August is the ideal time of year to visit, when temperatures reach an average of 62.6 F. Travelers looking to avoid the cold should look outside of February, when temperatures are typically at their lowest (around 19.4 F).