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I'm learning python on my own from a book and solving problems. In one problem, the user inputs amount of rain for each month in one year across a period of years. I need to find the average of rain in each year (sum(monthly rain)/numb_months, and also the average of rain in that period, e.g. in two years. In the following code, I can get the average for each year (I used 3 months only instead of 12 months to avoid tedious input now), but I don't know where I need to put an accumulator for total rain in that period and then average it. I appreciate your help.

number_of_months = 3
years_in_period = int(input("Please enter the number of years in the period. n"))

for year in range(years_in_period):
 yearly_rain = 0
 print('Year', year+1) 
 print('−−−−−−−−−−−−−−−−−')
 for month in range(number_of_months):
 print('Month', month+1, end='')
 monthly_rain = float(input("Please enter rainfall for this month: n"))
 yearly_rain += monthly_rain
 average_yearly_rainfall = yearly_rain / number_of_months
 print("Average yearly rainfall of year ", year+1, " is ", average_yearly_rainfall)
 print("Year total rain is", yearly_rain)
 print()

If I understood what you want (to calculate the absolute average of the rain amount during the period), this should do the trick:

number_of_months = 3
years_in_period = int(input("Please enter the number of years in the period. n"))

total_rain = 0

for year in range(years_in_period):
 yearly_rain = 0
 print('Year', year+1) 
 print('−−−−−−−−−−−−−−−−−')

 for month in range(number_of_months):
 print('Month', month+1, end='')
 monthly_rain = float(input("Please enter rainfall for this month: n"))

 yearly_rain += monthly_rain

 total_rain += monthly_rain

 average_yearly_rainfall = yearly_rain / number_of_months

 print("Average yearly rainfall of year ", year+1, " is ", average_yearly_rainfall)
 print("Year total rain is", yearly_rain)
 print()


total_months = years_in_period * number_of_months
print("Absolute average of rain/month was", total_rain/total_months)
print("Absolute average of rain/year was", total_rain/years_in_period)