There are three factors that determine the weather, each in its own way and each in combination with the other. These are warmth, moisture and the movement of the atmosphere, wind. In Astro-meteorology each has a ruler. These are the Sun for warmth, the Moon for moisture and Mercury for wind. Each shows both a general weather pattern and in a particular weather chart can also provide specific information.
True to mundane astrological practice the charts that show a general weather pattern are either ingress charts (for the Sun and Mercury) or Lunar phase charts. So the general pattern of warmth is shown by the ingress of the Sun into Aries, Cancer, Libra and Capricorn; the solstice and equinox points. The general moisture pattern can be read from the Lunar Phase, most importantly the New and Full Moon. The general wind pattern can be read from the ingress of Mercury into a sign. This is generally monthly.
Let us look at some charts:
Here is the Solar Ingress into Cancer on the 21st of June for my location (Bavaria, Germany). Unlike a natal chart, the most important house in a weather chart is not the Ascendant (the Ascendant has only secondary importance) but the 4th house. This is the location, the place where the weather will be happening. So, what information does the 4th house give us? Libra, a warm and moist sign is on the cusp. This promises some warmth for the summer season, but also moisture. But there are modifying factors. The first being the condition of the Ruler, in this chart Venus, and the second any direct aspects to the cusp, in this chart, the trine from the Moon/Mercury conjunction. Cool Venus in domicile in Taurus, a cold and dry sign in conjunction to warm Mars in detriment in cold and dry Taurus promises a cooler summer. Venus generally enhances any moisture and the conjunction with Mars suggests the collision of a warm and cold fronts, which in the summer season usually generate thunderstorms. The Moon/Mercury conjunction promises plenty of moisture and wind so the general forecast will include plenty thunderstorms and more then enough wind and rain. The general warmth pattern is constant alternation between warm and cool. It might also be noted that the 12th house position of the Sun also hinders a full development of its nature. No BBQ summer for Bavaria!
Now let us look at the moisture pattern for the end of June. Here we use the New Moon chart, which also is a solar eclipse chart:
Here cold and dry Virgo is on the IC. Cold Saturn is conjunct the IC. Mercury, L4 is in warm and dry Leo separating from a sextile to Mars. Venus in warm and moist Gemini squares the IC. The Moon eclipses the Sun at the very end of cold and moist Cancer. Also to be noted is how Mercury L4 picks up on or reactivates (by sextile) the Mercury/Moon conjunction of the Ingress chart. So what does this tell us about the moisture situation? At first glance we might be inclined to say dry. But there are important factors against this. First the Moon is in her own sign, and Cancer is wet. Secondly Venus square Saturn on the IC tends to condense any available moisture. Low and dark clouds pregnant with moisture and the winds to carry them! Particularly through the reactivation of the Ingress Moon/Mercury conjunction. Mercury L4 in hot Leo, enhances summer thunderstorm activity. So the amount of moisture to be expected is above average.
And what about the wind situation?
And what is the situation in the 4th house? Though not L4, Mercury is in the 4th house but not in the same sign (please note, my software absolutely insists on placing the ingress at 29 Cancer 59!). So the wind potential is somewhat lessened. The Sun in the 4th house in Cancer and Moon L4 in Taurus in the 1st house favour winds carrying low-lying moisture laden clouds.
During this period in July it was generally rainy, with some very hot days, quickly followed by thunderstorms. Generally, for July it was very cool with average temperatures of around 18* C only a few days had temperatures above 25*C.
Dear reader, of course it is justified to say that I am writing out of hindsight. If you want to read a weather forecast for the season for Devonshire, using the method demonstrated above, please visit Caroline Allen’s site. She has written an excellent weather forecast for her location and she has been more accurate so far than the British Met who predicted a BBQ Summer! Here is the link.