If I have the following data...

JAN W
JAN W
JAN L
JAN W
JAN L
JAN L
JAN L
JAN W
JAN W
JAN W
JAN W
FEB W
FEB L
FEB L

Is it possible to get the largest winning streak for any month? For example, in JAN it would be 4. Typically, I'll have about 1,000 entries per month.