The longest month puzzle 1990

1. Which was the longest month in Austin, Texas in 1990? Why?
2. Which was the longest month in Phoenix, Arizona in 1990? Why?
3. Which was the longest month in London, England in 1990? Why?
4. Which was the longest month in Helsinki, Finland in 1990? Why?
5. Which was the longest month in Tokyo, Japan in 1990? Why?
6. Which was the longest month in Canberra, Australia in 1990? Why?

The correct answer is not "September, which has 9 characters".

Think it over!

Published in Njet Problem! collection 1996-02-23.