The Climatoday

When Does Spring Begin?

There are a couple of very important reasons why this is the case. The most important is for climate record-keeping. Climatologists require set time periods to calculate averages and do seasonal comparisons over the years. Since astronomical dates change to different days depending on the year, it would be difficult and confusing for seasonal climate records to be based on those dates. A second reason is that weather-wise, it makes more sense around the globe. In spring, mild surges of air from the south are becoming a regular occurrence and severe weather threats begin to kick in by March 1. The heat of summer has been experienced in most areas across the country by June 1 and the heat of summer is waning by September 1..