The Effects of the Moon on Earth’s Weather

The moon causes tides on Earth. The most obvious ones are in the oceans, but they also occur in the atmosphere and also in ground water and even in the crustal material.

The moon also reflects solar radiation, maximized at full moon and minimized at new moon.

These effects are also maximised at perigee, when the moon is closest to the earth.

Ken Ring is a New Zealand based private weather forecaster. Ken provided the following brief summary of the importance of the Moon on Earth’s weather.

The Effects of the Moon on Earth’s Weather

By Ken Ring


The moon is responsible for the daily atmospheric tide, which changes air height according to the inconstant position of the moon. When the moon is above the horizon the air-tide is “in” and when it sets below the horizon and until the moon rises the air-tide is “out”.

This changing air height varies ground temperatures throughout the day, depending on the moon phase. It is well known that the full moon increases the temperatures on earth:,3976094

When the moon is out of the sky in daylight hours (1stQ moon dawn-noon, full moon time dusk-dawn, and lastQ time noon-dusk), the sun’s heat can reach the ground more intensely, with no absorbent air to block its path.

When the moon is out of the sky at night (lastQ dusk to midnight, new moon (midnight-dawn), and 1stQ midnight-dawn), the airtide is “out” letting in more of the heavier cold air from the edge of space which cools the ground more than otherwise.

In summer the full moon time is the hottest of the month, and consequently is around the time of the month when tropical cyclones form, because the water within 6 deg of the equator can be heated to 26-28degC which is required for sufficient evaporation to occur that will provide enough to fuel the cyclonic system. The new moon is also a cyclone breeder, because the new moon is in the sky all day which tends to clear the sky, thus allowing the sun’s heat to again penetrate closer to the ground.


The moon changes hemispheres on a 27-day cycle, due to the tilt of the earth. In summer the new moon is always over the southern hemisphere, the full moon is over the northern hemisphere, and the quarter moons are over the latitude of the equator. In winter the full moon is over the southern hemisphere and new moon over the northern hemisphere.


The perigee is the shortest moon-earth distance, and varies over a 27-day cycle. Perigee exaggerates whatever else is going on. When it is, e.g. full moon and perigee in summer, there is extra heat around. It may be noted that TC Ian began to form around 1st-2nd January, when it was new moon + a very powerful perigee (second closest moon-earth distance) for all of 2014.

There is no way to measure global temperature at any one moment, when at that moment half the world is experiencing freezing winter and the other the half burning heat of summer. Also, half the globe is enjoying daylight and the other half the cold night temperatures. There is no thermometer invented that can measure the temperature of the whole globe at once, nor the temperature of anywhere a day ahead and certainly not measure temperature of anything, let alone the whole world, over a whole decade or century ahead. Anyone who thinks they can is just guessing.

Ken Ring

  • Ken Ring, of is the Australasian longrange forecaster who predicts coming weather patterns by planetary cycles and orbits of the moon and sun.  It is science, not astrology.
  • Ken is longrange consultant and presenter for both Australia’s Channel Seven and Nine Networks and author of the Weather Almanacs for Australia.
  • NZ publisher Random House NZ


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