The USA year is the same as everyone else, 365 days except in a leap year when there are 366.
A year has 365 days in a normal year, and when I mean normal, I mean, when it isn't a leap year, and a leap year consists of 366 days.
Breckinridge Colorado is not apart of the US three days a year. This is because the area was not included in the Louisiana purchase and didn't officially join the US until 1936. It joined with the stipulation that 3 days of the year it would not be in the US.
Average work days per year in the US is about 260.
Oil is being produced 365 days a year.
When we say "A Year", we mean the number of days it takes for our planet (Earth) to orbit the sun. A year for us is 365.25 days because that is how long it takes for Earth to orbit around the sun. This is also the reason why we have a leap year with one extra day every four years, to make up for the extra 0.25 of a day we don't count when our year/orbit completes.
180 days
365.2425 mean solar days
365.25 days. If you want a more exact answer you have to specify whether you mean the vernal equinox year, the sidereal year or the tropical year.
The median or mode year of the Gregorian calendar has a length of 365 days. (The minimum length of a Gregorian year is 365 days, the maximum length is 366 days, and the mean length is 365.2425 days.)
yes
If by "only 31 days" you mean "exactly 31 days", then 7. If by "only 31 days" you mean "not more than 31 days" then all of them.
Mode average year is 365 days = 8760 hours Median average year is 365.5 days = 8772 hours Mean average year is approximately 365.2425 days = 8765.82 hours