Start by looking at the error message closely - it will give you a filename, a line and probably a column number. These will help you work out what the problem is by looking at the exact code that generates it.
In this case, there are a few problems with that code but teh one you have reported is probably here:
static void Main(string[] args)
{
public enum Humidity
{
You can't define an enum within the body of a method: you need to move it outside the Main method and to the class level by closing the method:
static void Main(string[] args)
{
}
public enum Humidity
{
Your app won't do anything at all - because Main is empty - but that error will go!
BTW: do yourself a favour and be consistent.
When you use two different styles in the same file, it makes it very difficult to read.
Compare:
public static void Main(string[] args)
{
...
}
private static string
GetHumidityDescription
(
Humidity Level
)
{
...
With:
public static void Main(string[] args)
{
...
}
private static string GetHumidityDescription(Humidity Level)
{
...
And never, ever, put commas on a line of their own!