The reason your hair is full of static is that your hair lacks moisture. You need to use a moisturizing conditioner and not apply it to the roots, just the mishit to the ends. If you still don’t want to use the conditioner, then use the spray in the conditioner. Cold winter air is less humid, yet in summer, the air is more humid, so the water in the air allows electricity to flow off of the hair shaft rather than building up and causing hair static.
If you are not using a hair conditioner, it’s time to start. Keep conditioning product concentrated on the end of the hair if you are concerned about greasiness or conditioner weighing your hair down. These light moisture shampoos are also a good choice for keeping conditioning light yet compelling.
Another tip is to get a static quad and spray it from away into your brush. You can also get the unscented dryer sheets and rub one on your hair to remove the static.
Some other tips for not making hair static