[Python] ZyBooks Lab:Seasons assignment - What's wrong with my code

Lab:Seasons assignment Write a 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 so far:

input_month = input()
input_day = int(input())

months = ('January', 'February', 'March', 'April', 'May', 'June','July', 'August', 'September', 'October', 'November', 'December')
if not (input_month in months):
print ('Invalid')

elif input_month == 'January':
if not (0 < input_day <= 31):
print('Invalid')
else:
print('Winter')

elif input_month == 'February':
if not (0 < input_day <= 29):
print('Invalid')
else:
print('Winter')

elif input_month == 'March':
if (0 < input_day < 20):
print('Winter')
elif (20 <= input_day <= 31):
print('Spring')
else:
print('Invalid')

elif input_month == 'April':
if not (0 < input_day <= 30):
print('Invalid')
else:
print('Spring')

elif input_month == 'May':
if not (0 < input_day <= 31):
print('Invalid')
else:
print('Spring')

elif input_month == 'June':
if (0 < input_day <= 20):
print('Spring')
elif (20 < input_day <= 30):
print('Summer')
else:
print('Invalid')

elif input_month == 'July' or 'August':
if not (0 < input_day <= 31):
print('Invalid')
else:
print('Summer')

elif input_month == 'September':
if not(0 < input_day <= 30):
print("Invalid")
elif (0 < input_day <= 21):
print ("Summer")
else:
print ("Autumn")

elif input_month == 'October':
if not (0 < input_day <= 31):
print('Invalid')
else:
print('Autumn')

elif input_month == 'November':
if not (0 < input_day <= 30):
print('Invalid')
else:
print('Autumn')

elif input_month == 'December':
if (0 < input_day <= 20):
print('Autumn')
elif (20 < input_day <= 31):
print('Winter')
else:
print('Invalid')


I am getting errors for September 31 and November 7th and I can't figure out why?

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