I counted days on my calendar and found that there are 186 summer days between the spring and fall equinoxes, but only 179 days between fall and spring. There are more summer days between the equinoxes than winter days because the Earth's orbit is slightly elliptical and not quite a perfect circle. The odd thing is that our summer is longer because the Earth is actually farther from the sun and takes longer to go the distance. If this seems like another stumper, remember that it's just the opposite south of the equator. The seasons are actually caused by the tilt of the Earth's axis.
Distance has little to do with it.
Eastern Daylight Time . I guess the official start of the seasons is figured from the East Coast only. This could create a wobble of a day or two in the exact count of summer and winter calendar days, but our northern hemisphere summer will always be longer than our winter, as measured between the equinoxes. The actual distance from the Earth to the Sun varies from about 91.5 million miles at perihelion when it is closest, to about 94.5 million miles at aphelion when it is most distant. This is not enough to make a difference in any model or drawing you could construct, but it does slightly effect the length of the seasons.