Jack's suggestions

Winter - Carp are creatures of habit and crave to be warm, and this is therefore why the weather is so important when trying to locate them. In the colder months carp will move into deeper water and the colder it is, the deeper the water they'll be in naturally. I can consequently suggest that on warmer winter days you fish in slightly shallower water or in mid-water (The Zig Rig) whereas if it's cold pitch up in the deepest part of the lake. Watch the weather, it can be the difference between blanking an catching when the carp aren't showing themselves and giving away their location. 

Autumn/Spring - This is always the 'funniest' time to catch carp, because often it's dramatic changes in weather that switches them on to feed. For example if a NE wind blows for 5 days in 11 celcius, the carp just may not have it, but if suddenly the wind changed to a SW (The warmest wind) in 16 celcius, the carp are likely to go mental and feed like there's no tommorow, so I suggest watch for distinct changes. Also look out for thunder storms (Always BE SAFE) because dramatic weather can equally get the carp active and hunting for food. 

Summer - The hot weather will push carp into the margins and onto the top, look for hot weather combined with low pressure because it's these days where you can grab your floater gear and be ready to slay any water as the carp get feeding of the surface. On the bottom, the shallower the water the better, because that water will take less time to heat up and as a result will be warmer, and as I previosuly metioned, carp love heat. Also little hedges or snags are also great hiding places for carp and lily pads can be viewed as a carp haven, so avoid them at your peril.