Earths Tilt and Polar Variations

There is also variations between polar regions. As the north pole experiences summer the south pole experiences winter. The north and the south are closer to the sun at different times of the year. Summer solstice occurs on the southern hemisphere around 21st December while the north experiences summer. In both hemispheres, first day of winter solstice marks first day of astronomical summer similar to the first day of winter solstice.

When the earth is not tilted on its axis, these polar regions experience spring and autumn. This phenomena is referred to as equinox. These are times when the earths axis is pointed parallel to the sun instead of being towards or away from it. Days and nights during the equinox are equal. Spring on equinox happens around 20th March on the northern hemisphere while the southern hemisphere experiences autumn. Vernal or spring equinox starts on 20th September on the southern hemisphere as the north experiences autumn. In both hemispheres, first day of autumnal equinox marks first day of fall. The same holds for the first day of the vernal or spring equinox.

Intra-seasonal Variations

There are other factors that affect temperature and weather conditions over seasons. For instance mountainous regions experience more ice on winter than the plains. Some areas experience dry summers while some experience wet summers. Coastal regions may experience violent tropical storms.

Meteorological Description

Seasonal points are preceded by weather conditions. This is because seasonal change does not happen at an instant but over a given period. Meteorological seasons are based on these changes. Here, seasons are assigned to three months which show weather consistency. The northern hemisphere experiences winter from December to February. Spring on the north and autumn on the south is experienced from March to May. Months of summer are June, July and August. From September to December comes autumn on the north and spring on the south.


These seasons have a huge impact on life on earth. Activities carried out in each location depends on the prevailing weather. For example people go skiing on winter when there is ice. Also, swimming happens during summer. Animals migrate, hibernate or mate depending with seasons. Plants germinate, bear fruits and weather depending with seasons. Conditions are only favorable for specific activities. Each season comes with its own threats and sustenance.

Seasons: The Cause Of Changes In A Year

Weather conditions vary throughout the year. These changes provide four major seasons, winter, summer, spring and autumn. Seasons vary in characteristics and affect life on earth. This discussion dwells more on the nature and occurrence of seasons. Seasons are based on celestial influence where they are denoted by positions around the sun. There are also variations due to earths tilting. Seasons are assigned to given months which show weather consistency.

Descriptions of the Four Seasons

Descriptions vary with locations but some transcend all boundaries. Spring is described as the season when seeds start to germinate and grow. During this time, the weather is warm and humid. This is the time most animals are born. Ice melts and high amounts of rainfall that can cause floods are experienced. During summer, temperatures reach their peak for the year. This is when heat waves and droughts occur. This causes health problems and deaths among humans, animals and plants. Rivers dry up and forest fires scotch the land. Some areas especially in coastal regions may experience increased rainfall.

In autumn temperatures cool down and dormant growth is seen in plants. Animals start migrating in search for warmer climates. They also prepare for the coming season by storing food. Among humans, there are many cultural events held to celebrate bountiful harvests. Winter is the cold and chilly season. A few areas experience ice and snow while others receive cold rain. Animals hibernate in search of warmth. Winter celebrations are based on appreciating the return of light.

Sun and Earth Relations

Characteristics and timing of seasons is determined by earth’s position. The earth revolves around the sun in an elliptical shape. This causes variations in amount of solar radiation received on earth’s surface. Seasons are related to specific positions of the earth around the sun. Extreme positions provide summer and winter seasons. The earth also tends to tilt along its axis. This causes variations in seasons between tropics and equatorial regions.

Polar and Tropical Variations

Weather conditions around the equator show little variations. Warm summers are barely discernible from balmy winters. The equatorial region forms the outer most curve of the earth where radiation is received constantly. Polar regions experience significant changes. Equatorial regions experience hot summers and tropical regions experience icier winters.