How rare is a red rainbow?It is rare to see a red rainbow but that’s probably because of the conditions they usually appear in.“Red rainbows aren’t really all that rare, but a lot of people miss them since, unless you have a dark background, the colour gets washed out,” according to the Sky Lights blog.Meanwhile, another photographer captured this blood red moon looming over New York in these stunning photos.Last year, a tourist captured this spectacular ‘fire rainbow cloud’ phenomenon on camera. Here’s something you don’t see everyday.An amateur photographer captured a rare site, a double red rainbow arching over a historic English town.Robert Peel spotted the incredible red rainbow in the small Wiltshire market town of Malmesbury, where he lives, on August 24.The sun had already set in the southern Cotswolds when the rainbow formed in the light of the sun from below the horizon, giving an incredible red glow to the sky. A rare ‘red rainbow’ is seen arcing over the Wiltshire town of MalmesburyCredit:Robert Peel / SWNS Want the best of The Telegraph direct to your email and WhatsApp? Sign up to our free twice-daily Front Page newsletter and new audio briefings. “Last night an extensive storm had spread from the south bringing rain. It was late evening I noticed the horizon to the west was clear and low sunlight was illuminating the old hilltop town,” he explained.“It looked spectacular so I quickly grabbed my camera and headed to a vantage point on the hill opposite the town. Annoyingly I was a few minutes late and the sun had become obscured by clouds on the horizon. The light was however quite special; I remembered similar conditions back in 2011 when I captured a rainbow at sunset. However, it had stopped raining so I was not expecting to see a rainbow. “Just as I thought about giving up I noticed that a rainbow was just beginning to form. Still no rain – how could this be? The sun was by now obscured behind hedgerows as gradually sunk from view behind me. By now the town was shaded but the sun was still illuminated the sky above. “After a few minutes the rainbow became increasingly vibrant and formed into a full, double rainbow as seen in the photograph. The really striking feature was the colour, with vibrant red and magenta, with a red inner arc; a phenomenon I have noticed when photographing rainbows at sunset and sunrise. The spectacle disappeared quickly as the sun set further below the horizon.” You can see more of Robert Peel’s work here. Researchers at the American Geophysical Union have previously explained in more detail why some rainbows appear all red.“The main factor appears to be the height of the sun above the horizon. At sunset, the width of the red band increases, while the width of the other bands of colours decreases,” they said.“The orange, the violet, the blue and the green bands disappear completely in this order. At the end, the primary bow is mainly red and slightly yellow.” What is a red rainbow?The low angle of the sun results in a longer distance for its light to travel through the atmosphere, causing shorter wavelengths of light, such as blue, green and yellow, to be scattered and leaving primarily red.In the lower light environment where the phenomenon most often forms, a monochrome rainbow can leave a highly dramatic effect.