Answer: It sounds to me as though you have a warm season turfgrass. These grasses go dormant during the cold weather and perk up again during the summer months. The only way to counteract that is to overseed with a cool season grass seed. The cool season grass will be green in fall and spring; the warm season grasses will be green in summer. Together, they should deliver and nice gree turf nearly all year around.
The most common cool season grasses include Kentucky bluegrass, rough bluegrass, annual bluegrass, perennial ryegrass, annual ryegrass, tall fescue, fine fescues, and creeping bentgrass.
Overseed your lawn this spring with one of the above grass seeds and you should see a big difference in the turf's color this year.
Be sure to put your lawn on a regular maintenance schedule for optimal growth: adequate water, regular mowing, and feeding in April, June, September and late November. I've discovered that the right formula of fertilizer for a local area usually goes on sale at just the right application time so watch for sales and you'll save some money.
Best wishes with your lawn!
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