California

• California Data Exchange Center California Dept. of Water Resources, Division of Flood Management. Access point to the CDWR Operational Hydrologic Data. Snow pack, river stages, stream flows, precip/snow.
• FEMA El Niño Resources CERES
• California Environmental Resources Evaluation System (CERES) keyword: Climate and Weather
• California Irrigation Management Information System (CIMIS) Detailed weather information for irrigation scheduling from the CIMIS weather stations around the state
• California State Information from National Oceanic and Atmospheric Administration (NOAA), National Weather Service
• Intellicast Links to local forecasts, current weather, radar and satellite imagery
• UC Statewide IPM Project daily weather data and climatic averages from current reporting and historical stations across California.
• UC IPM Degree-day calculator connected to the weather data in UC IPM's weather database

Regional and National

• National Weather Service:  National Oceanic and Atmospheric Administration (NOAA) 
• Agricultural Weather Information Service (AWIS)
• AccuWeather
• USA Today Weather
• Unisys Weather