Mean relative humidity hovers between 63 -- 77 percent in the morning throughout the year .
Afternoon mean relative humidity is more uneven , ranging from 36 percent in July to 69 percent in January and December .
Mean relative humidity hovers between 63 -- 77 percent in the morning throughout the year , but afternoon mean relative humidity is more uneven , ranging from 36 percent in July to 69 percent in January and December .