I would say that the country with the longest average growing season is Saudi Arabia.
I hope this helps you!
The Arabian Peninsula known as Arabia is a peninsula located in Western Asia in the northeast of Africa on the Arabian plate. It is on the junction of Africa and Asia. It is east of Ethiopia and northern Somalia, south of Israel and Palestinian. It is known for it's physical features such as the plentiful precipitation, the Red sea, desert terrain, fertile farmland or soil, petroleum reserves and dry climate.
When winds move air masses, they carry their weather conditions (heat or cold, dry or moist) from the source region to a new region. When the air mass reaches a new region, it might clash with another air mass that has a different temperature and humidity. This can create a severe storm.