Table of Contents 1. Introduction, 2. Crop Weather Observatory, 3. Weather Elements-Various Instruments, their Installation and Maintenance, 4. Calculation of Time, 5. Measurements of Air Temperature and Soil Temperature, 6. Measurement of Atmospheric Humidity, 7. Measurement of Rainfall, 8. Measurement of Wind, 9. Measurement of Evaporation, 10. Measurement of Solar Radiation, 11. Measurement of Cloud Amount, 12. Preparation of Isohytal and Isothermal Maps, 13. Concept of Potential Evapotranspiration, 14. Rainfall Probability Analysis, 15. Study of Microclimate, 16. Water Budgeting, 17. Synoptic Charts and Weather Reports, 18. Appendix, 19. Selected References