Adding Values from One Column Based on Criteria in another column

If i have the following layout of data

Column 1 Column 2
January 1000
January 1234
February 1300
March 1600
January 15
March 123
April 234
January 3000

I would like a formula that adds all the January numbers together returning a result of 5249

To move this one step further i would eventually need to add these numbers based on quarters, for example if the value is January February or March in column 1 then add the numbers in column 2.

I'm sure i have done this before using a countifs maybe but my mind has drawn a blank could someone help

Many thanks

I have solved this using SumIFs. Thanks for your time reading this, if someone else needs me to explain happy to do so.