I need help understanding how to write program that takes a date as input and outputs the date's season. The input is a string to represent the month and an int to represent the day.

Ex: If the input is:

April 11 

the output is:

Spring 

In addition, check if the string and int are valid (an actual month and day).

Ex: If the input is:

Blue 65 

the output is:

Invalid 

The dates for each season are:

Spring: March 20 - June 20

Summer: June 21 - September 21

Autumn: September 22 - December 20

Winter: December 21 - March 19

My code:

month = input()

day = int(input())

season = int()

if month in ('March', 'April', 'May'):

print('Spring')

elif month in ('June', 'July', 'August'):

print('Summer')

elif month in ('September', 'October', 'November'):

print('Autumn')

elif month in ('December', 'January', 'February'):

print('Winter')

else:

print("Invalid")

I can't figure out how to do the other half with the dates.