Average monthly snow and rainfall in Biyagama

The mean monthly precipitation over the year in Biyagama (), including rain, snow, hail.

• A lot of rain (rainy season) falls in the months: March, April, May, June, July, August, September, October, November and December.
• On average, October is the wettest month with 374 mm of precipitation.
• On average, January is the driest month with 78 mm of precipitation.
• The average amount of annual precipitation is 2760 mm.