Looking on the internet deeply has found these results:

During the summer is the most popular phrase on the web.

During a summer 188,300 results on the web	During the summer 1319,000,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
How to Stay Active During a Summer Heat Wave. August 1, 2015; Fitness. 0. It's good to break a sweat during a workout. Along with many health benefits, it's a�... ... Pregnancy Skincare Issues. During a summer pregnancy, women need to be vigilant about skincare as their delicate skin is more susceptible to sun damage. Dec 30, 2015 ... Beat the heat during a summer wedding. May, June and July consistently rank among the most popular months to get married. These months�... 8 Ways to Grow Your Business During a Summer Lull By Alicia M Forest Have things slowed down for your business now that the warmer months are upon us�...	It doesn't look like this phrase is very popular! The search could not find any examples on the internet.

During a summer

188,300 results on the web

During the summer

1319,000,000 results on the web

More popular!

How to Stay Active During a Summer Heat Wave. August 1, 2015; Fitness. 0. It's good to break a sweat during a workout. Along with many health benefits, it's a�...
... Pregnancy Skincare Issues. During a summer pregnancy, women need to be vigilant about skincare as their delicate skin is more susceptible to sun damage.
Dec 30, 2015 ... Beat the heat during a summer wedding. May, June and July consistently rank among the most popular months to get married. These months�...
8 Ways to Grow Your Business During a Summer Lull By Alicia M Forest Have things slowed down for your business now that the warmer months are upon us�...

It doesn't look like this phrase is very popular! The search could not find any examples on the internet.