January: 一月 (ichi-gatsu)
February: 二月 (ni-gatsu)
March: 三月 (san-gatsu)
April: 四月 (shi-gatsu)
May: 五月 (go-gatsu)
June: 六月 (roku-gatsu)
July: 七月 (shichi-gatsu)
August: 八月 (hachi-gatsu)
September: 九月 (ku-gatsu)
October: 十月 (jyuu-gatsu)
November: 十一月 (jyuu-ichi-gatsu)
December: 十二月 (jyuu-ni-gatsu)
There are also traditional Japanese names for the 12 months. Although it’s uncommon to hear these names being used, you still run across them from time to time. The traditional names are:
January: 睦月 (mutsuki)
February: 如月 (kisaragi)
March: 弥生 (yayoi)
April: 卯月 (uzuki)
May: 皐月 (satsuki)
June: 水無月 (minazuki)
July: 文月 (fumizuki)
August: 葉月 (hazuki)
September: 長月 (nagatsuki)
October: 神無月 (kannazuki)
November: 霜月 (shimotsuki)
December: 師走 (shiwasu)
