Thanks Karro

I need to define the landscape now based on temperature and rainfall. I'm going to use the Köppen climate classification. The five major climate classifications are:

A - Moist Tropical Climates are known for their high temperatures year round and for their large amount of year round rain.

B - Dry Climates are characterized by little rain and a huge daily temperature range.

C - In Humid Middle Latitude Climates land/water differences play a large part. These climates have warm,dry summers and cool, wet winters.

D - Continental Climates can be found in the interior regions of large land masses. Total precipitation is not very high and seasonal temperatures vary widely.

E - Cold Climates describe this climate type perfectly. These climates are part of areas where permanent ice and tundra are always present. Only about four months of the year have above freezing temperatures.
From - http://www.blueplanetbiomes.org/climate.htm

On my map this gives:

Click image for larger version. 

Name:	Calen Ndor16.jpg 
Views:	324 
Size:	635.4 KB 
ID:	11720

The Wikki entry has a full set of climate types. I will use the sub groups when i map in more detail but for the moment i will be working on the following general guidelines:

A - Tropical Rainforest
B - Desert
C - 1 - Mediterranean
2 - Temperate Forest
D - 1 - Grassland
2 - Boreal Forest
E - Polar Ice and tundra

type 1 climates are from 0 - 30 degrees and type 2 60 - 90 degrees.

Of course these are very basic but allow me to map the background terrain of any area and then add in local climate effects and human influence more realistically.

The next stage is to actually try and make some pretty maps, but I'm happy that unlike all the previous maps i have tried to make i won't have to spend hours worrying about what the air and ocean currents, latitude and prevailing wind are doing.