Precise timekeeping is essential for ensuring reliable data collection, especially in remote and outdoor weather stations. While clock drift is typically minimal in controlled indoor environments, outdoor applications are exposed to temperature fluctuations and humidity, which can lead to significant drift in system time if accurate real‑time clocks (RTCs) or time synchronization mechanisms are not in place.
Accurate timestamps are important, for example, for the following reasons:
- Data integrity
- Accurate timestamps ensure that data collected from various sensors is synchronized and can be accurately correlated.
- Analysis and forecasting
- Accurate time data is essential for analyzing weather patterns and making reliable forecasts.
- Station diagnostics
- Timestamps are important for station diagnostics, such as ensuring log coherence.
- Sensor fusion
- Accurate timestamps are critical for sensor fusion from multiple weather stations, ensuring that the sampling time is well known.
- Avoiding time jumps
- It is crucial to avoid sudden jumps in time between measurements, especially backward jumps, which can result in duplicate timestamps for different measurements. Instead, time adjustments should be made gradually, similar to how NTP adjusts the clock in small steps so that the timescale is effectively continuous without causing abrupt changes.