Farthest from the sun

Farthest from the earth

How many days the temperature was below 18C (65F). See: http://www.energylens.com/articles/degree-days for a fuller explanation.

Lowest level of visible cloud or the height at which clouds may form

The temperature point at which air is cooled causing water vapour to condense out into water

Ordinary thermometer. See: wet bulb thermometer below.

The amount of water vapour in the air

Mean sea level (MSL) is the average (mean) height of the sea, with reference to a suitable reference surface. Defining the reference level, however, involves complex measurement, and accurately determining MSL can prove difficult. See: Wikipedia explanation

This is a world-wide recognised format for reporting weather information and is predominantly used by pilots as a part of a pre-flight weather briefing. It is also used by meteorologists who use it to assist in weather forecasting.

How many days into the lunar phase, i.e. since last new moon