Is there a trick to learning how many days are in a each month for one year

Answer 1

memorize this poem (sing it).

30 days hath September,
April, June and November,
All the rest have 31,
Excepting February alone.
Which only has but 28 days clear
And 29 in each leap year

Answer 2

Yes.

I learned this when I was a child -- and now almost 70 years later I still remember it.

30 days hath September, April, June and November.

All the rest have 31, except February which has 28.

Answer 3

I "count" on the knuckles of my hand, going "hill" then "valley" matching with Jan, Feb, etc
When on a hill, its 31, in a valley it is 30, unless Feb, which I know anyway.
When I get to the last high knuckle, that would be July, I start over . Of course that is another hill for August.