National Weather Service
Point lookup and hourly forecast endpoints power temperature, humidity and precipitation-probability inputs.
NWS API documentation →PRIMARY SOURCES
Start with the original.
CTG adds normalization and interpretation; it does not obscure where the underlying information came from.
U.S. Drought Monitor
The current FeatureServer polygon layer supplies D0–D4 classifications by monitored location.
USDM GIS data →Municipal utilities
Rules are sourced directly from official utilities. Austin Water and Round Rock have automated verification adapters in v1.
View supported rules →U.S. Census Geocoder
Street addresses are sent to the Census geocoder only when a user explicitly requests an address lookup; CTG does not persist them.
Census Geocoder →