how to calculate seasonal mean for temperatures

Thank you both for your answers.

I found a best way to delete the first 2 months (Jan + Feb) and the last
month (Dec), which should work everytime:

DF$year <- as.numeric(format(DF$Day, format = "%Y"))
DF$month <- as.numeric(format(DF$Day, format = "%m"))

# delete first 2 months
for(i in DF[1,3])  # column year
   	ifelse(i==2008,(DF= DF[c(-(1:60)),]),(DF=DF[c(-(1:59)),]))
I delete the first 60 days if the first year if my file starts with a leap
year (I'll need just to add the new leap years afterwords), and the 59 first
days if it's not.

# delete last month	
     DF= DF[c(-((nrowDF)-30):nrow(DF))),]

I did a mistake next for the seasons:
- winter should be month 12,1,2 (so month 12 of the previous year, that's
why I deleted the first 2 months)
- spring: month 3,4,5
- summer: month 6,7,8
- autumn: month 9,10,11

Now my file starts month 3 of the first year (as I deleted the first 2
months).
My first year has so: month 3,4,5,6,7,8,9,10,11,12 and the nest year: month
1,2,3,4,5,6,7,8,9,10,11 (we imagine a file with just 2 years).
  I tried to modify your proposition but it doesn't work yet.

Could you help me again with this new version of season?
Thank you very much Ricardogg







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