The Real Time files we use generally contain the last 45 days of “Realtime” data – data that went through automated quality checks and were distributed as soon as they were received. Missing data in the Realtime files are denoted by “MM” while a variable number of 9′s are used to denote missing data in the Historical files, depending on the data type (for example: 999.0 99.0).
General
- Units – Station pages display the current hour’s measurements in English units by default.
- Time – Station pages show current observations in station local time by default.
- Station ID – Five-digit WMO Station Identifier, used since 1976.