Frost risk, rain to greet the beginning of summer in Atlantic Canada
Unusual for late June, a summer frost advisory has been issued in parts of Newfoundland for Tuesday morning, while other parts of Atlantic Canada could see 30-50 mm of rainfall this week
Summer is now in full force, but parts of Newfoundland will be feeling more like early spring come Tuesday morning as there is a chance of frost.
Temperatures will be in the single digits, with some locales getting down to near the freezing mark, prompting frost advisories. Cover up plants, especially those in frost-prone areas.
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Meanwhile, parts of the Maritimes will be seeing heavy rainfall and embedded thunderstorms on Tuesday. Anywhere from 30-50 mm of rain is possible in the hardest-hit areas.
Frosty Tuesday morning for parts of the region
Parts of Newfoundland may wake up to temperatures near the freezing mark to 6 degrees (coolest in low-lying areas) on Tuesday morning under clear skies and calm winds.
Frost advisory is in effect, including in Corner Brook, Badger, Burgeo, St. Alban’s and the entire Burin Peninsula.
Advisories are widespread but temperatures at or below the freezing mark are more isolated to inland and valley regions.
If temperatures fall at or below the freezing mark after the summer solstice, that would be quite rare, with Badger being a notable exception.
Most recent occurrences of frost after the solstice (June 21-July 31) ay Newfoundland stations:
Deer Lake(most at risk, forecast-wise)
26 June 2018 (-1.5°C)
24 June 2003 (-0.3°C)
23 June 2002 (-0.1°C)
Badger (most at risk, forecast-wise)
28 June 2025 (-1.3°C)
27 June 2025 (-0.3°C)
9 July 2021 (-1.6°C)
Corner Brook (least at risk forecast-wise)
28 June 1941 (-0.6°C)
Gander (least at risk, forecast-wise)
22 June 1975 (-0.6°C) (51 years ago)
22 June 1957 (0.0°C)
Parts of the Maritimes could see 30-50 mm of rain
The pattern will change midweek as a warm front lifts first into the Maritimes on Tuesday, and then Newfoundland on Wednesday.
On Tuesday, embedded thunderstorms are possible along with heavy downpours.
A risk for 30-50 mm of rainfall for the Bay of Fundy and along the south coast of Newfoundland.
A weaker system will track across the region on Friday with another round of showers. The threat for occasional showers will continue through the weekend with cooler-than-seasonal temperatures.
Next week should feature near seasonal temperatures with a threat for another system or two as an active pattern continues into the first few days of July.
Stay with The Weather Network for the latest updates across Atlantic Canada