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METAR YPJT 070300Z AUTO 10010KT 9999 // NCD 27/10 Q1018 RMK RF00.0/000.0

In the above METAR report, I have two questions:

  1. What does the fraction "27/10" mean?
  2. What does "RF00.0/000.0" also mean?
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The term 27/10 is the temperature (27°C) and dew point (10°C).

The RF term in the remark section is used to indicate the accumulated rainfall (in this case 0, so no rain):

What is the meaning of the RF group in METAR/SPECI and TTF?

This group reports rainfall in the last ten minutes and accumulated rainfall since 0900 local. For example, RF02.2/024.4 reports that 2.2mm of rainfall has fallen in the 10 minutes prior to the report time; and 24.4mm has fallen since 0900 local.

(Australian Government - Bureau of Meteorology)

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