Tulu Nadu also experiences heavy rainfalls during Monsoon season. The rainfall is very sporadic in occurrence and consists of light individual rainfalls. Agriculture is the main economic activity with irrigation depending mainly on monsoon and seasonal rainfalls. Winters are short and mild with frequent rainfalls. Hurricanes passing near Richmond have produced record rainfalls. The wettest months are August and September, when there are occasional short-lived rainfalls. Winters are also accompanied by occasional rainfalls that bring down the temperature further. This time of year has the heaviest rainfalls. It grows at altitudes from with annual rainfalls from . It was one of the heaviest rainfalls in recorded world's history. However, there are some very unpredictable rainfalls that occur sometimes. This is due to high rainfalls causing the fertilizers to be washed into waterways. In the Western Rhodopes, the temperature varies from and in the summer rainfalls prevail. Generally, wasps are unable to predict heavy rainfalls. This becomes very visible when comparing the annual normal rainfalls, on and around the massif.