A Maximum Minimum Temperature System or MMTS is a temperature recording system that keeps track of the maximum and minimum temperatures that have occurred over some given time period.
- "Measuring Temperature". National Atmospheric and Oceanic Administration (USA). 2006-08-09. Retrieved 2008-05-24.
- "U.S. National Report on Systematic Observations for Climate" (PDF). NOAA. Retrieved 2008-05-25.
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