What is the maximum and minimum average monthly temperature per country? $($One row for each country$)$

What is the average monthly temperature per country for the years $19102010?($One row for each country$)$

What is the yearly temperature difference between the minimum and maximum temperatures for the USA from $1995-2005?($Subtract lowest from highest temperatures, one row for each year$)$

What is the average winter temperature per year for the Great Britain from $2000-2010?($Calculate for the months December, January. and February, one row for each year$)$

What is the average summer temperature per year for the Great Britain from $2000-2010?($Calculate for the months June, July and August, one row for each year$)$