Sacramento, United States — ranked month by month from data: temperature, rainfall, snow, and peak hazard seasons. The standouts: April, November, May.
Best · April & November
About Sacramento
Sacramento is the capital city of the U.S. state of California. The county seat of Sacramento County, it is located at the confluence of the Sacramento and American Rivers in the Sacramento Valley.
— condensed from Wikipedia ("Sacramento, California")
Each month is scored on temperature comfort (18–27°C avg high is the sweet spot), rainfall (more rain days = lower score), snow days, and peak hazard seasons (hurricanes, monsoons, etc.). Green-tier months are within ideal range with no major issues. Yellow are workable but with trade-offs. Red has at least one significant problem — extreme heat or cold, heavy rain, or peak storm season.