The correct term for "the condition of the atmosphere at a certain time and place" is weather.
- Climate refers to the long-term average of weather conditions in a particular area over extended periods.
- Relative humidity is a measure of how much water vapor is in the air compared to the maximum amount the air can hold at that temperature.
- Visibility refers to how far one can see, which can be affected by weather conditions but is not synonymous with the overall state of the atmosphere.
So, in summary, the answer is weather.