No. Station distance, terrain, elevation, and local variation limit that inference. Identify the actual observation location.
No. Missing, trace, and zero values can have different meanings. Read the dataset documentation before interpreting them.
Not by themselves. Check the observation period and seek suitable hourly data if available.
Save the dataset and station identifiers, retrieval details, date range, units, documentation, and any transformations used in analysis.
Not alone. That is a case-specific causal or forensic conclusion requiring additional evidence and qualified interpretation.