Taking the local weather in Vernal into account is an important factor for planning your visit, especially if you plan to spend your trip by the pool. The hottest months are usually July and August, with an average temperature of 20°C, while the coldest months are January and December, with an average of -2°C. The snowiest months in Vernal are March, December, January and February, with each month seeing an average of 17 cm of snowfall.