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According to Labban it seems the AC of the ingresses determines the general tone of thge year or season.See below:

Chapter One: Introduction to this Part
[1] The conditions of the higher world indicate their corresponding things in the
lower world: exaltation <in> high rank <in>, dejection <in> decline <in>,
ascent <in> rising <in>, descent
<in> fall <in>, the benefics <in> happiness <in>, a retrograde <planet> return and decrease <in>. The
other conditions in the planets are analogous to this. They are numerous and a
discussion concerning their enumeration and counting would be lengthy.
[2] The forms which are in the lower world are obedient to the forms belonging
to the <zodiacal> circle. Scorpions <on> are obedient to the
figure of Scorpio, snakes <on> are obedient to the figure of Hydra, wild
lions <on> are obedient to the figure of Leo, and so on. Because of
this, the makers of talismans depicted them at <the> the planets' arrival
in them for what they wanted and operated.
[3] When the ascendant of the year is a fixed sign, the judgment for the
whole year is according to it. When it is a bicorporeal sign, the judgment for
the second half of the year is according to the ascendant of the arrival of the
Sun at Libra. When it is a tropical sign, the judgment for each season is from
the ascendant of the arrival of the Sun at the tropical sign. For this division,
Aries belongs to the spring season, Cancer to the summer season, Libra to the
autumnal season, and Capricorn to the winter season. Judgment about all these
is <made> in one and the same way

Chapter Two: On General Conditions of the Generations of Men
[1] It is known that the revolution (ta].Jwil) of the year of.the world is the arrival
of the Sun at the first second 1 of Aries, and that the ascendant of this time is
the ascendant of the year and the ascendant of the revolution. The ascendant
at the Sun's arrival at the initial points of the tropical signs2 is the ascendant of
the <respective> season. We have described in the preceding <chapter>3 that
if the ascendant of the year is a fixed sign, the judgment for the whole year is
according to it; if it is a bicorporeal sign, the judgment for the second half of the
year is from Libra; and if it is a tropical sign, the judgment for each season is
from its ascendant. 4
[2] The majority of the conditions of the year are based on the nature of
the most powerful planet in the figure of the horoscope of the year. One should
judge for citizens from the ascendant, from the planet ruling over it, i.e., the lord
of the year (salkhudah), and from the Moon; one should judge for authority from
the Sun by day, from the Moon by night, and from the midheaven and its lord
by day and night; one should judge for scribes, ministers, and governors from
Mercury; for the people of piety, peace, and religion from Jupiter; for the people
of a noble family and elder masters from Saturn; for the army and all weapons
from Mars; for women
1'