Meteorological Spring Begins: How El Niño Could Impact Temps In New Hampshire

NEW HAMPSHIRE — Warmer temperatures in the Granite State are expected to be around 45 degrees Fahrenheit on Friday, the first day of meteorological spring.

Astronomical seasons change with equinoxes and solstices, determined by Earth’s tilt and the sun’s alignment over the equator. On that calendar, the vernal equinox on Tuesday, March 19, marks the official first day of spring.

Meteorological observing and forecasting led to the creation of the meteorological seasons, which are broken into four three-month blocks based on the actual temperature cycle and calendar. The meteorological seasons more closely reflect actual conditions than do astronomical seasons, according to the National Oceanic and Atmospheric Administration’s National Centers for Environmental Education.

A recent forecast from The Weather Channel and Atmospheric G2 said spring will arrive early in most of the United States as an El Niño climate pattern falls apart after many areas saw a record-mild winter.

The National Weather Service forecast for Friday and into early March calls for rain on Saturday with highs in the mid-40s and cloudy skies and highs in he mid-50s on Sunday. Similar temperatures and conditions will continue during the week, with rain expected on Tuesday and Wednesday.

Generally, meteorological spring in the Northern Hemisphere is thought of as a three-month transition season from winter to summer that occurs in March, April, and May.

Meteorological fall — September, October and November — is also thought of as a time of transition, from summer to winter. Meteorological summer starts June 1 and continues through August, and meteorological winter starts Dec. 1 and continues through February of the following year.