Apex Weather

St. John Valley weather for Dec. 18-24, 2019

Short-Term Outlook
Mostly cloudy to overcast skies are expected today as a low pressure area tracks along a weak trough across central/southwestern and Downeast Maine. Light snow is expected across the Valley with light accumulations possible with most areas seeing less than 1-inch snowfall. Temperatures will remain cold today through Friday then moderate over the weekend into early next week.

Wednesday, December 18

Mostly cloudy to overcast with a 30 percent chance for mainly afternoon/evening snow showers with less than 1-inch (2.5 cm) accumulation. Liquid precipitation equivalents around 0.01 inch. High around 18 degrees F with northwest winds 0 to 5 mph. Wind chill values 0 to 5 degrees F. 

Wednesday night, mostly cloudy with a 30 percent chance for snow showers with less than 1-inch accumulations, if any (around 0.02-inch liquid equivalent). Low around 4 degrees F with northwest winds increasing to 5 to 10 mph after midnight. Wind chill values in the -5 to -15-degree F range overnight.

Thursday, December 19

Mostly cloudy with a 30 percent chance for snow showers with less than 1-inch accumulation. High around 10 degrees F with northwest winds 10-15 mph with gusts 25-35 mph–higher gusts across open areas/higher terrain. Wind chill values -10 to -15 degrees F. 

Thursday night, mostly cloudy and breezy with a 20 percent chance for snow showers. Less than 1-inch accumulation anticipated. Northwest winds 10 to 15 mph. Low near 6 degrees F with wind chill values in the -10 to -15-degree F range.

Friday, December 20

Partly sunny with a high around 20 degrees F. Northwest winds near 10 mph producing wind chill values around -10 degrees F in the morning to around 0 degrees F in the afternoon.

Friday night, partly cloudy with a low around 9 degrees F. Northwest winds 0 to 7 mph.

Further Ahead: Saturday – Tuesday

High pressure brings partly cloudy and dry conditions Saturday with a weak area of low pressure tracking to the north of the Valley bringing considerable cloudiness and a slight chance for snow to the region Sunday afternoon into early Monday. A mostly cloudy/partly cloudy and generally dry day Monday is followed by a quick-moving system that drops a cold front across the region producing a chance for snow showers Tuesday. The Winter Solstice occurs Saturday, December 21 at 11:19 pm ET.

Medium-Range Highs/Lows

Sat. Dec. 21: mid-20s / low 10s

Sun. Dec. 22: upper 20s / mid-10s

Mon. Dec. 23: low 30s / upper 10s

Tue. Dec. 24: upper 20s / low 10s

Long-range Trends Wed. Dec. 25 – Tue. Dec. 31

Normal temperatures and below 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.

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