Andhra Climate

Drier Zone

Rainfall here is less than 80 cms annually

Rayalaseema region basically consist of 7 districts – Anantapur, Kadapa, Kurnool, Nandyala, Chittoor, Annamayya and Sathya Sai which see less rainfall which is less than 70 cms annually. But if you go South-Easterly, the rainfall increases exponentially towards Tirupati – Nellore coasts. Part of Prakasam and North-West Nellore district also comes in this zone.
Majority of Rainfall (around 70-80%) happens during South-West Monsoon (June to September) and remaining 20-30% happens during North East Monsoon and Winter / Summer seasons.
Kurnool, Nandyala and Chittoor districts usually get more rain compared to other areas of Rayalaseema.
There are certain years where severe drought happens when rainfall records very poor.

Rainfall here is between 80-110 cms annually

Almost all districts : Srikakulam, Vizianagaram, Parvathipuram Manyam, Visakhapatnam, Anakapalli, Kakinada, Konaseema, Ubhaya Godavari, NTR (Vijayawada), Eluru, Krishna, Guntur, Palnadu, Nellore districts fall under this zone.
Majority of Rainfall (around 50-60%) happens during South-West Monsoon but a portion of 30-40% happens during North-East Monsoon. Remaining happens during Summer / Winter seasons.
Seasonally Cyclones batter the coast more often in October to December and also ocassionally during May month.
Parvathipuram, Kakinada, Konaseema gets more rain than rest of the districts due to regular Monsoon Lows passing through this are during South-West Monsoon.

Rainfall here is between 110-170 cms annually

Only Alluri Seetharamaraju and Tirupati district fall under this category.
Alluri Seetharamarju district gets 70-80% rainfall during South-West Monsoon but only 5% during North-East Monsoon and the rest 15% in Winter / Summer.
While Tirupati district gets a bulk rainfall out of North-East Monsoon (October to December) which is around 70% and remaining 20-30% during South-West Monsoon and rest 0-10% in Summer / Winter transitions.
Both the regions get regular floods during their respective peak seasons, but Tirupati district coastline is more prone to Cyclones during North-East Monsoon season.