intradaily

Intradaily is an adjective describing events, measurements, or phenomena that occur within a single day or trading day. The term is commonly used to indicate high-frequency activity and timeframes shorter than a full day.

In finance, intradaily data refer to price quotes, trades, and trading volume recorded within the same trading day. Analysts and traders use intradaily time series to study intraday patterns, liquidity, volatility, and to develop strategies such as intraday trading or market-making. Typical intradaily intervals include 1-minute, 5-minute, 15-minute, 30-minute, and hourly data, as well as tick data that records every transaction. Working with intradaily data requires careful handling of time zones, market holidays, and daylight saving time, and practitioners must account for microstructure noise and irregular sampling when modeling.

Intradaily concepts are also used in other disciplines to describe changes within a day. For example, in meteorology or energy balance studies, intradaily measurements capture diurnal variations in temperature, solar radiation, or energy consumption to understand daily cycles and peak demand periods.

Terminology and usage vary regionally. Intraday is the more common term in finance, while intradaily and intra-daily are also found in literature, sometimes as hyphenated forms. When comparing sources, attention to whether the reference is to calendar days, trading days, or specific markets is important for accurate interpretation. Related concepts include intraday data, high-frequency data, and diurnal patterns.