St. John Valley weather for Dec. 16-23, 2020
Short-Term Outlook: Wednesday – Friday
High pressure north of the Valley will keep mostly sunny skies and cold conditions across the region today as an Arctic air mass settles into the SJV.
Partly cloudy skies develop tonight as a low pressure area moves out of the Middle Atlantic region and tracks across the southern Gulf of Maine east of Cape Cod Thursday with some snowfall affecting the coastal and interior Downeast regions. High pressure centered northwest of the region Friday will bring partly cloudy skies to the area through Saturday afternoon.
Today & Tonight
Mostly clear with a high near 5 above. Northwest winds 5 to 10 mph.
Overnight, partly cloudy with a low around -10. Northwest winds become north 0 to 5 mph with wind chill values 15 to 20 below zero.
Thursday, December 17
Mostly clear with a 10 percent chance for precipitation. High in the lower 10s with north winds 0 to 5 mph.
Thursday night, partly cloudy with a 10 percent chance for precipitation. Low in the 0 to 5 above range with north winds 0 to 5 mph.
Friday, December 18
Partly cloudy with a 5 percent chance for precipitation. High in the low 20s with north winds 0 to 5 mph.
Friday night, partly cloudy with a low in the 0 to 5 above range. Northwest winds 0 to 7 mph.
Medium-Range: Saturday – Tuesday
High pressure moves east of the region Saturday. A weak front will move through Sunday with a chance for snow, mainly in the afternoon and evening, with snow showers persisting into Monday. Another cold front moves through Monday into Tuesday with a continued chance for snow showers along with warmer temperatures.
Saturday, December 19
Partly cloudy in the morning then increasing clouds with a high in the mid-20s. 5 percent chance for precipitation. South winds 0 to 7 mph.
Saturday night, mostly cloudy with a 20 percent chance for snow after midnight. Low in the mid-10s with south winds 0 to 7 mph.
Sunday, December 20
Partly sunny with a 30 percent chance for snow. High in the upper 20s with south winds 0 to 7 mph.
Sunday night, mostly cloudy with a 30 percent chance for snow/snow showers. Low in the lower 20s with south winds 0 to 7 mph.
Monday, December 21 / Winter Solstice at 5:02 am ET / Great Conjunction Saturn and Jupiter
Cloudy with a 30 percent chance for snow showers. High in the low 30s with south winds 0 to 7 mph.
Monday night, considerable cloudiness with a 40 percent chance for snow showers. Low in the mid-20s. South winds 0 to 7 mph.
Tuesday, December 22
Cloudy with a 40 percent chance for snow showers. High in the low 30s with west winds 0 to 7 mph.
Tuesday night, partly cloudy with a 20 percent chance for snow showers. Low in the upper 10s with northwest winds 0 to 7 mph.
Regional Long-Range Trends: Wed. Dec. 23 – Tue. Dec. 29
Above normal temperatures and near normal precipitation
Note: Computer model precision diminishes the further into the week the forecast projects. Check the Fiddlehead Focus for weather updates with more current information.
The Week Ahead is the work of UMFK Professor Joseph E. Becker based on personal weather station data, various computer forecast models, and information that the National Weather Service, NOAA, and other weather resources provide.