For the first half of this week, New England remains embedded within a trough. An upper-level low pressure system has parked itself just to the north of New England and a cold pool will center itself over New England through midweek. This will keep chilly temperatures around for the region with highs topping out in the 40s across northern areas and 50s south. On top of that, widespread morning lows in the 20s and 30s will bring frost and freeze chances across the region through Friday morning.
The upper-level low will also cycle scattered rain and snow showers into northern New England through midweek. These will mostly be confined to the higher elevations. The most widespread of these showers will likely come Tuesday evening into the overnight hours. By Tuesday night, most of the rain showers will have transitioned to light snow showers. Southern and central New England will more likely stay completely dry during this time.
Below: GFS showing potential weather this evening:
For nearly all of October thus far, the same general pattern has been more or less stuck in place across the United States. This pattern has been a general ridge-in-the-west-trough-in-the-east setup. This has bottled up warm temperatures in the west while seasonable to below average temperatures have dominated for the east. This has also kept much of the west dry and has prevented larger storms from forming and traveling across the country (not including tropical weather, which is independent from this setup).