Due to the ongoing "fun" associated with wagering on ASOS temperatures, this page attempts to show an audit path on which products go into figuring out a given airport station's daily high and low temperature. This page only works for stations having NWS CLI product coverage. This audit path includes raw METARs, METAR 6 Hour max/min values, Daily Summary Messages (DSM)s, CLImate Reports (CLI), and CF6 Reports. This is all unofficial data and is not intended for gambling purposes!

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Daily High Temperature Events
Daily Low Temperature Events

Application Notes

  1. "High Frequency" MADIS data is not used due to reporting in whole degree C and not using standard two minute averaging.
  2. The NWS computes this over a local standard day, so 1 AM till 1 AM local during daylight saving time. This app attempts to account for that.
  3. It is sometimes vague what happens with the METAR report that occurs just before midnight local for the start of the period. This app considers the temperature report, but not the 6 hour max/min reported at this time.