July is the seventh month of the year (between June and August) in the Julian and Gregorian calendars and the fourth of seven months to have a length of 31 days. The Roman Senate named it in honor of Roman general Julius Caesar, the month of his birth. Before that, it was called Quintilis, being the fifth month of the 10-month calendar. It is, on average, the warmest month in most of the Northern Hemisphere, where it is the second month of summer, and the coldest month in much of the Southern Hemisphere, where it is the second month of winter. The second half of the year commences in July. In the Southern Hemisphere, July is the seasonal equivalent of January in the Northern hemisphere.
 

Months of the Year

A month is a unit of time used with calendars, which is approximately as long as a natural period related to the motion of the Moon; month and Moon are cognates. The traditional concept arose with the cycle of moon phases; such months (lunations) are synodic months and last approximately 29.53 days. Researchers have deduced that people counted days in relation to the Moon's phases from excavated tally sticks as early as the Paleolithic age.