What does it mean to say that the average daytime relative humidity of a particular city is 31 percent?

Saying that the average daytime relative humidity of a city is 31 percent means that, on average, the air in that city contains 31 percent of the maximum amount of moisture it can hold at a given temperature during the day. This indicates a relatively dry climate, with lower moisture levels in the air, which can affect comfort levels and the likelihood of precipitation. It also suggests that the air is less saturated, potentially leading to clearer skies and warmer temperatures.