FIREFinance

4.4% APY = 4.4% for the year and not per month.
$1000 for 3 months at 4.4% APY will yield an interest of : [(4.4/100)*(1000)]*[3/12] = $11
$1000 for 1 month at 0.3% APY will yield an interest of : [(0.3/100)*(1000)]*[1/12] = $0.25
Bonus on $1000 in 4 months : = $50
Total earnings for $1000 in 4 months : $[11+0.25+50] = $61.25
APY for $1000 : [[(61.25/4)*12]/1000]*100 = 18.375%

-----------------
To check for correctness of above calculation, if you back caculate:
An APY of 18.375% on $1000 for 4 months will give an interest of: [(18.375/100)*(1000)]*[4/12] = $61.25
-----------------

The APY has increased to 5.06% for 12 month CDs with minimum $2000.

A cool blog on FIRE - Financial Independence Retire Early - FIRE Finance