Other facts from our historical weather data: Which months have the greatest rainfall in Hallin? Most rainfall (rainy season) is seen in January, October, November and December. Which is the warmest month in Hallin? August has an average maximum temperature of 17°C (63°F) and is the warmest month of the year. Which is the coldest month in Hallin? The coldest month is February with an average maximum temperature of 9°C (48°F). Which is the wettest month in Hallin? January tops the wettest month list with 161mm (6.3 in) of rainfall. Which is the driest month in Hallin? May is the driest month with 84mm (3.3 in) of precipitation. Which is the sunniest month in Hallin? May is the sunniest month with an average of 197 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.