I know all along Singapore's weather is coldest during Dec/Jan (northern winter) Chinese new year's period. I suddenly realize I don't know why. Does anyone have the explanation?
The seasons are due to the earth's axis being tilted from the earth's orbital plane around the sun by about 23.5°. About 22 June, the northern hemisphere is tilted most towards the sun and has longer daylight. This longer heating period per day is the cause of a general hotter daily temperature during summer. But the summer solstice is about 21 Dec in the southern hemisphere, so Australia now is summer and has hotter daily temperature.
Then because the earth's orbit around the sun is an ellipse (oval shape), the perihelion (the earth's closest distance from the sun) is about on 1 Jan; the aphelion (the furthest from the sun) is on 1 July. The distance variation is about 3%. I expect southern summer to be hotter than norther summer. Is it true? I am not sure.
If a location is exactly at the equator, I expect summer or winter seasons would not have any daily temperature difference if not for other causes.
Then why Singapore is coldest during northern winter (Dec/Jan) and not during southern winter (Jun/Jul). The coordinate of Singapore is 1.35N 103.8E. I expect a 1.35° north of the equator to be a very slight amount and cannot make our "northern" summer hot and winter coldest. I believe there may be other causes like wind directions blowing from hotter or colder hemisphere. Also, south of Singapore is more ocean, north more of land mass.
Any geography experts here in Singapore?
Chan Rasjid.
The seasons are due to the earth's axis being tilted from the earth's orbital plane around the sun by about 23.5°. About 22 June, the northern hemisphere is tilted most towards the sun and has longer daylight. This longer heating period per day is the cause of a general hotter daily temperature during summer. But the summer solstice is about 21 Dec in the southern hemisphere, so Australia now is summer and has hotter daily temperature.
Then because the earth's orbit around the sun is an ellipse (oval shape), the perihelion (the earth's closest distance from the sun) is about on 1 Jan; the aphelion (the furthest from the sun) is on 1 July. The distance variation is about 3%. I expect southern summer to be hotter than norther summer. Is it true? I am not sure.
If a location is exactly at the equator, I expect summer or winter seasons would not have any daily temperature difference if not for other causes.
Then why Singapore is coldest during northern winter (Dec/Jan) and not during southern winter (Jun/Jul). The coordinate of Singapore is 1.35N 103.8E. I expect a 1.35° north of the equator to be a very slight amount and cannot make our "northern" summer hot and winter coldest. I believe there may be other causes like wind directions blowing from hotter or colder hemisphere. Also, south of Singapore is more ocean, north more of land mass.
Any geography experts here in Singapore?
Chan Rasjid.