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Boston Weather: 48.0°F | Overcast

Weather: Spring Blocker

By Greg Lawson
STAFF METEOROLOGIST -- It’s now spring, Daylight Savings time is here, April has started ... all signs are pointing to milder New England weather.

So where is it? Well, things are not as abnormal as they seem. Sunday’s snow flurries were not just an April Fools’ joke; the average date for the last freeze in Boston is April 8. However, the normal high temperatures for Boston in early April are in the low 50s (10-11°C), and we’ve been averaging about 10 degrees below that for over a week now.

A persistent upper-level trough is to blame. The jet stream has consistently dipped south of New England for the last week, thereby keeping us in a pool of cold air. It has been slow to move eastward primarily because of a persistent high pressure system, a “blocking” high, which is sitting over the mid-Atlantic.

It looks like this trough will continue to keep temperatures cooler than normal until Friday at the earliest, though there will at least be some warming back into the upper 40s (8-9°C). High pressure builds into New England tomorrow and Wednesday, which will both dry out the air and help move the trough along. Temperatures by the weekend could reach into the 60s (16-17°C), though it currently looks like rain might be accompanying the warmth.

Extended Forecast

Today: Cloudy and mild. Healthy northerly breeze. High of 45°F (7°C).

Tonight: Mostly cloudy. North winds continue. Low of 35°F (2°C).

Wednesday: Partly cloudy. Winds shifting to westerly. High of 46°F (8°C). Low of 34°F (1°C).

Thursday: Scattered clouds. Light winds. High near 50°F (10°C). Low in the upper 30s (3-4°C).

Friday and Beyond: Warming into the low 60s (16-17°C) with rain possible.