The thirteenth year of Josiah’s reign was 627
Hebrew In the fifth month, of the ancient Hebrew lunar calendar. A number of events in Jeremiah can be cross-checked with dates in surviving Babylonian records and related accurately to our modern calendar. The fifth month in the eleventh year of Zedekiah’s reign occurred within the months of August and September 586 Also see 52:12 and the note there.
The Hebrew word for “watching” (shoqed) sounds like the word for “almond tree” (shaqed).