The 8th Month is Cheshvan (חשון) also called Marcheshvan (מרחשון), and it is significant in that is is the only month on the Jewish calendar that has no holidays, other than Shabbat.
There are two annual events in Chesvhan:
7 Heshvan - V'tein Tal u-Matar ("Deliver Dew and Rain"), a prayer, is added to the Shemoneh Esrei prayers in Israel. If no rain has fallen by the 17th of the month, special prayers are added for rain
Bahab - According to most customs, on the first Sabbath of Cheshvan, a prayer is recited on behalf of all those who are going to fast on Bahab. Bahab, or in Hebrew בהב stands for 2, 5, 2, which means Monday, Thursday and Monday. On the Monday, Thursday and second Monday after the Sabbath, the custom is to fast and/or recite penitential prayers called Selichot. According to the Ashkenazi custom, the second Monday of Bahab is the Monday before Rosh Chodesh Kislev, the Thursday is the Thursday preceding that, the first Monday is the Monday preceding that and the Sabbath, in which the prayer is recited is the Sabbath preceding that. Bahab is also observed at the beginning of Iyar.
April is the first month of the ancient Hebrew calendar, and for good reason. The Gregorian calendar has the beginning of the year in January just as winter is beginning to get to it's coldest two month. Ancient hebrews put the beginning of the year in spring wich is the first station of the year wich is a more logical calendar. December in ancient Hebrew calendar would be the ninth month.
In the Hebrew calendar, the month of Av is followed by the month of Elul.
The Hebrew month Adar is the same in all countries. It is a Spring month.
In the Hebrew calendar, the month of Nissan immediately precedes Iyar.
April is not a month in the Hebrew calendar, and the Sundays in any Hebrew month could easily change from year to year, just as they often do for any month in the civil calendar.
The tenth month in the Hebrew calendar is called "Tamuz". It usaually falls out around July time.
Adar is the sixth month of the Hebrew calendar and the twelfth month of the civil calendar used in ancient Persia. It typically falls in February or March on the Gregorian calendar, and it is the month that contains the holiday of Purim.
tevet
Adar.
There are 12 months in the Hebrew calendar. In a leap year there are Adar A and Adar B. Adar is the sixth month.
Cheshvan
Av is the 5th Month of the year on the Hebrew calendar. It usually occurs in June or July