Air temperature and dew point temperature shall be given rounded to the nearest whole degree Celsius, with observed values involving 0.5°C rounded to the next higher whole degree Celsius.
No. 1
4.3.2.3.7 Altimeter setting(s)

The QNH altimeter setting shall be given and, either on a regular basis in accordance with local arrangements or if so requested by the pilot, the QFE altimeter setting. Altimeter settings shall be given in hectopascals and shall be rounded down to the nearest lower whole hectopascal.
4.3.2.3.8 Other significant information

4.3.2.3.8.1 This shall include any available information on meteorological conditions in the area of the aerodrome, and in the approach, missed approach or climb-out areas relating to the location of cumulonimbus or thunderstorm, moderate or severe turbulence, wind shear, hail, severe squall line, moderate or severe icing, freezing precipitation, severe mountain waves, sand storm, dust storm, blowing snow, tornado or waterspout, as well as any information on recent weather of operational significance (i.e. freezing precipitation; moderate or heavy precipitation; moderate or heavy blowing snow; duststorm or sandstorm; thunderstorm; tornado or waterspout; volcanic ash) observed during the period since the last issued routine report or last hour, whichever is shorter, but not at the time of observation.
4.3.2.3.8.2 In meteorological reports disseminated beyond the aerodrome, only information on wind shear and on recent weather of operational significance as given in
4.3.2.3.8.1 shall be included.
4.3.2.3.9 When the visibility is 10 km or more, there is no cloud below 1 500 m (5 000 ft), or below the highest minimum sector altitude, whichever is greater, and no cumulonimbus, and there is no weather of significance as given in 4.3.2.3.4.1 and 4.3.2.3.4.2, information on visibility, runway visual range, present weather and cloud amount, type and height shall be replaced by the term “CAVOK”.
4.3.3  Messages concerning the operation of aeronautical facilities
Note.— General provisions concerning this subject are set forth in Annex 11, 4.2.
4.3.3.1 Messages concerning the operation of aeronaut-ical facilities shall be transmitted to aircraft from whose flight plan it is apparent that the operation of the flight may be affected by the operating status of the operating facility concerned. They shall contain appropriate data on the service status of the facility in question, and, if the facility is out of operation, an indication when the normal operating status will be restored.
IX. Air Traffic Services Messages
4.3.4  Messages containing information on aerodrome conditions
Note.— Provisions regarding the issuance of information on aerodrome conditions are contained in Part V, 8.
4.3.4.1 Whenever information is provided on aerodrome conditions, this shall be done in a clear and concise manner so as to facilitate appreciation by the pilot of the situation described. It shall be issued whenever deemed necessary by the controller on duty in the interest of safety, or when requested by an aircraft. If the information is provided on the initiative of the controller, it shall be transmitted to each aircraft concerned in sufficient time to enable the pilot to make proper use of the information.
4.3.4.2 Information that water is present on a runway shall be transmitted to each aircraft concerned, on the initiative of the controller, using the following terms:
DAMP — the surface shows a change of colour due to moisture.
WET — the surface is soaked but there is no standing water.
WATER PATCHES — patches of standing water are visible.
FLOODED — extensive standing water is visible.

4.3.5  Messages concerning air traffic incident reports
4.3.5.1 When an aircraft involved in an incident has a destination outside the area of responsibility of the ATS unit where the incident occurred, the ATS unit at the destination aerodrome should be notified and requested to obtain the pilot’s report. The following information should be included in the message:
　
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