Scripture Readings for Epiphany, Year B
The primary reason for the season appears to be to celebrate the Epiphany of the Lord, when the three Magi visited the baby Jesus. This is always celebrated on January 6, regardless of year, using the readings for the Day of the Epiphany.

The secondary reason seems to be to fill in the Sundays between Christmas and Lent. If January 6 falls on a Sunday, then the readings for the Day of Epiphany are celebrated. Otherwise, the readings for Baptism of Our Lord, are used. The readings for Epiphany 2-9 follow the readings for Epiphany, until Lent begins. Depending upon when Lent begins, there may not be enough Sundays to use all of the readings for Epiphany.

Baptism of Our Lord
Liturgical Color: White
Genesis 1:1-5
Psalm 29 (3)
Acts 19:1-7
Mark 1:4-11

Second Sunday after Epiphany
Liturgical Color: Green
1 Samuel 3:1-10 [11-20]
Psalm 139:1-6, 13-18 (1)
1 Corinthians 6:12-20
John 1:43-51

Third Sunday after Epiphany
Liturgical Color: Green
Jonah 3:1-5, 10
Psalm 62:5-12 (6)
1 Corinthians 7:29-31
Mark 1:14-20

Fourth Sunday after Epiphany
Liturgical Color: Green
Deuteronomy 18:15-20
Psalm 111 (10)
1 Corinthians 8:1-13
Mark 1:21-28

Fifth Sunday after Epiphany
Liturgical Color: Green
Isaiah 40:21-31
Psalm 147:1-11, 20c (3)
1 Corinthians 9:16-23
Mark 1:29-39

Sixth Sunday after Epiphany
Liturgical Color: Green
2 Kings 5:1-14
Psalm 30 (2)
1 Corinthians 9:24-27
Mark 1:40-45

Seventh Sunday after Epiphany
Liturgical Color: Green
Isaiah 43:18-25
Psalm 41
2 Corinthians 1:18-22
Mark 2:1-12

Eighth Sunday after Epiphany
Liturgical Color: Green
Hosea 2:14-20
Psalm 103:1-13, 22
2 Corinthians 3:1-6
Mark 2:13-22

Nineth Sunday after Epiphany
Liturgical Color: Green
Deuteronomy 5:12-15
Psalm 81:1-10
2 Corinthians 4:5-12
Mark 2:23-3:6

Transfiguration of Our Lord
Last Sunday after Epiphany
Liturgical Color: White
2 Kings 2:1-12
Psalm 50:1-6 (2)
2 Corinthians 4:3-6
Mark 9:2-9