February – ar-yu-eh
Written as èryuè or eryue
Note: February in Mandarin Chinese ends with "month" which we already know is yu-eh (yue).
February is ar-yu-eh (eryue).
To remember that the beginning of the word for February is pronounced ar (er) use the following mnemonic:
The barracks water supply was fed by a brewery (February). The army (ar) cadets got very drunk.

Tones
Ar (army) is a 4th tone with \ as an accent.
Associate army, a 4th tone, with lowering things like trip or slide down. See Tones and Mnemonics.

The army cadet tripped because he was so drunk.
Remember
Ar = 4th tone = \