Superstitions are all perfectly timed as coincidence and mostly not based on any science.
However, there are some of these that can be explained by Science. Check these out!
1. Halo around the sun or moon, rain or snow soon
The halo formation around the sun or moon is a layer of cirrus clouds made of ice crystals. The said formation of cirrus clouds acts as tiny prism that forms a white or sometimes colorful halo around the sun or the moon. Rain or snow will not always follow in a cirrus stratus cloud, however there's a big chance to see a big halo—remember, the brighter the circle, the greater the possibility.
2. Red sky at night, sailor's delight. Red sky in the morning, sailors take a warning
The red sunset is the result of the lower atmosphere's contents of particles like dust, salt, smoke and pollution that scatters away some of the shorter wavelengths of light (colored violets and blues.) The air sinks if an area of high air is present. The sinking air holds air contaminants near the earth making the sunset redder than the usual. This means the red sky at night.
Since high pressure generally brings fair weather, this type of red sky at sunset would delight a sailor. Low pressure may bring clouds, rain or storms, which is a warning for sailors.
3. Clear moon, frost soon
Clear atmosphere will result to a rapid cooling of earth's surface as heat is radiated away at night. Low temperature and wind's absence during clear nights will result to frost formation.
4. Rainbow in the morning gives you fair warning
When the morning sun is at the east, the shower and its rainbow are in the west. The morning rainbow means the rain is from the west to the observer.
5. Praying the Lord's Prayer will result to a perfect soft-boiled egg
A soft-boiled egg is usually done at around 15 seconds--same pace as to saying the Lord's Prayer. So, whether you say the Lord's Prayer or you count from 1 to 15 - you can have a soft-boiled egg.
6. St. Elmo's fire
The fire referred here is actually called Plasma. This is a phenomenon that appears sometimes on ships at sea during thunderstorms. St. Elmo's fire is St. Erasmus of Formiae--the patron saint of Sailors. Contrary to belief, St. Elmo's fire is actually an electrical weather phenomenon.
The electric field around the object is cause by ionization of the air molecules, producing faint glow easily visible in low light conditions.
7. Seeing a single Magpie in spring, foul weather will bring
A lone magpie will look for food during cold weather leaving behind the other magpie to stay with the eggs or young ones in their nest.
8. Toast for the sick. A sick person is healed if a toast and water are placed by her / his side.
This is because the charcoal surface of burnt bread prevents the water from being affected by certain impurities of a sick room.
9. Milk the first few squirts out of each teat on to the ground so the invisible fairies will not retaliate if this act of kindness is ignored.
The first milk drawn from the teats of the cow has thousand microbes that can harm the drinker. The remaining milk drawn after the first is better.
10. Fairy cross stone will save a person from harm (sickness, witchcraft, accidents and disaster)
Also known as fairy stones and fairy tears as this are believed to be the tears of fairy like spirits (Yunwi Tsunsdi.) This unique, cross-shaped stone (staurolite--a combination of silica, iron and aluminum) is used as good luck charms.
Heat and pressure caused these minerals to crystallize--and appear on the stones in a cross like structure.
Plus 1--A black cat that cross your path will result to some kind of misfortune; bad luck or a combination of bad events.
This assertion seems to imply the existence of a malevolent being in cats--a misfortune toward people. The idea that black cats cause bad luck is false. Cats do not affect the luck of anyone.
In conclusion, superstitions sometimes produced a profound change in one's life, but all depends on the points of view and where we live wherein we happen to believe.