Agricultural meteorology deals with the meteorological, hydrological, pedological and biological factors that affect agricultural production as well as the interaction between agriculture and the environment. This training manual is developed for the Training of Trainers (TOT) to effectively implement agro-meteorology at the local level through multiple methodologies tested in Lao PDR, such as climate field schools and group approaches, public announcement systems (loudspeakers), and school programmes. The manual is developed for the use of the Laos Climate Service for Agriculture (LaCSA) online system developed under the Global Environment Facility (GEF)-funded project Strengthening Agro-climatic Monitoring and Information Systems (SAMIS) to improve adaptation to climate change and food security in Lao PDR. It is aimed for TOT, and the design is flexible so that any modules or lessons can be extracted and applied in field-level staff training with some local adjustments. The training can also help fill gaps between the producers of agrometeorological services and the farmers’ actual needs to improve their livelihood.