Here is the list of Tamil months with their approximate English month equivalents:
தமிழ் மாதங்கள் | Tamil Months with English Period
1. சித்திரை (Chithirai) – April 14 to May 14
2. வைகாசி (Vaikasi) – May 15 to June 14
3. ஆனி (Aani) – June 15 to July 14
4. ஆடி (Aadi) – July 15 to August 14
5. ஆவணி (Avani) – August 15 to September 14
6. புரட்டாசி (Purattasi) – September 15 to October 14
7. ஐப்பசி (Aippasi) – October 15 to November 14
8. கார்த்திகை (Karthigai) – November 15 to December 14
9. மார்கழி (Margazhi) – December 15 to January 14
10. தை (Thai) – January 15 to February 14
11. மாசி (Maasi) – February 15 to March 14
12. பங்குனி (Panguni) – March 15 to April 13