Does anybody know why summer is the time of year when there are a lot of weddings in the U.S.?
Because of the weather. It is rather cold from November to April and most people aren’t willing to leave their home as much during those months as they are over the summer. It’s better to have a summer wedding if you want guests to come 
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June is actually the most popular month for weddings(possibly for tax reasons) followed by July and August, historically there are many reasons why. Most people got married in June because they took their YEARLY BATH in May and still smelled pretty good by June. However, they were starting to smell so brides carried a bouquet of flowers to hide the body odour. The goddess Juno (for whom June is named) was the protector of women in all aspects of life, but especially in marriage and childbearing.
“Marry in the month of May, and you’ll surely rue the day.
Marry when June roses grow, over land and sea you’ll go.
Those who in July do wed, must labor for their daily bread.
Whoever wed in August be, many a change is sure to see.
Marry in September’s shrine, your living will be rich and fine.
If in October you do marry, love will come but riches tarry.” anonymous poem.
On a practical note, others chose June in order to time conception so births wouldn’t interfere with harvest work.
There are many others but I reckon that if you have a big white wedding dress with a train and elaborately dressed hair, you would want to keep the rain off, the weather clinches it.