What is the distance from the Sun to the Earth for each month of the year?

According to the 1996 US Ephemeris, on the 21st of each month, the distance to the Sun is:

Month...............distance
January             0.9840
February            0.9888
March               0.9962
April               1.0050
May                 1.0122
June                1.0163
July                1.0161
August              1.0116
September           1.0039
October             0.9954
November            0.9878
December            0.9837
.................................

where 1.0 is the Astronomical Unit whose distance is 149,597,900 kilometers As you can see, the Earth is farthest from the Sun when the Northern Hemisphere is in the summer season, and closest in the winter. If you were living in the Southern Hemisphere, the seasons are reversed so that in the summer, the Sun is closest and in the winter it is farthest.