Vetein Tal Umatar Livrachah - from maariv on the night of Dec.5

Insert "Vetein Tal Umatar Livrachah" into the amidah from maariv on the night of Tuesday Dec.5

More information...

https://www.chabad.org/library/article_cdo/aid/2060070/jewish/Why-Is-the-Prayer-for-Rain-Based-on-the-Civil-Calendar.htm