This demo shows one of use-cases for SemIoT platform. Using multiple heterogenious data sources(such as online services of temperature observations Netatmo and Narodmon), SemIoT platform allows to aggregate this data and use it in different scenarios. One of them - analysis of city temperature and temperature dynamic in Moscow and Saint-Petersburg. Driver for each of data sources regulary collect observations, normalize them using ontologies and store in the internal storage. Demo allows to view these microtrends in real-time and archive modes.