Other facts from our historical weather data: When is summer in Knob Noster?The hottest season / summer takes place in June, July, August and September. Which is the warmest month in Knob Noster? July has an average maximum temperature of 31°C (88°F) and is the warmest month of the year. Which is the coldest month in Knob Noster? The coldest month is January with an average maximum temperature of 4°C (39°F). Which is the wettest month in Knob Noster? June tops the wettest month list with 154mm (6.1 in) of rainfall. Which is the driest month in Knob Noster? January is the driest month with 30mm (1.2 in) of precipitation. 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.