Other facts from our historical weather data: Which is the warmest month in Lake Hayes? February has an average maximum temperature of 17°C (63°F) and is the warmest month of the year. Which is the coldest month in Lake Hayes? The coldest month is July with an average maximum temperature of 2°C (36°F). Which is the wettest month in Lake Hayes? December tops the wettest month list with 141mm (5.6 in) of rainfall. Which is the driest month in Lake Hayes? July is the driest month with 99mm (3.9 in) of precipitation. Which is the sunniest month in Lake Hayes? January is the sunniest month with an average of 230 hours of sunshine. No idea where to travel to this year? We have a tool that recommends destinations based on your ideal conditions. Find out where to go with our weather planner.