Difference Between 1st Day of Spring and Spring Day

Many people don't know what they are saying when taking about start of spring in 2016. Because they don't know a difference in between the 1st of spring and 1st spring day. So let me tell you. The first day of spring is one thing, and the first spring day is totally another kind of thing. The difference between them is sometimes as great as a month.

What does this mean? It means first day of spring is fixed and it is a day when spring starts technically. But on the other side, the first spring day is generally referred to the day when the temperature becomes more than 16 degree Celsius. New leafs can be seen sprouting from plants and trees, birds can be seen in growls singing, etc. And this day doesn't fixed to any date. It can be any day in mostly in last two weeks of february, but some cities even observe this in January also, as Karachi did this in 2016.