Armstrong – Weather – It is the earliest frost advisory of the fall.

A brisk and misty Sunday morning in Armstrong comes with a rare August frost advisory, reminding residents that cooler nights are already arriving across Northern Ontario. Temperatures dipped to near freezing early this morning, threatening gardens and frost-sensitive crops. The rest of the week will gradually warm up, bringing sunshine and a return to late-summer comfort by midweek.

❄️ Frost Advisory – Sunday, August 17

Areas Affected:

• Armstrong – Auden – Wabakimi Park

Patchy frost formed early this morning as temperatures dropped to near 0°C — a concern for gardeners and local growers. Take precautions to protect tender plants, especially in low-lying areas where frost tends to settle first.

Environment Canada issues frost advisories during the growing season when overnight lows are expected to hit 0°C or lower.

Today’s Weather Overview

Current Conditions (7:50 AM EDT – Armstrong Airport)

• Temperature: 0.9°C

• Condition: Mist

• Wind: Calm

• Humidity: 98%

• Dew Point: 0.6°C

• Barometric Pressure: 102.8 kPa

• Visibility: 8 km

Sunday Forecast:

• Morning: Fog patches dissipating after sunrise

• Afternoon: Mainly sunny, warming steadily

• High: 19°C

• UV Index: 7 – High

Tonight:

• Clear skies

• Low: 7°C – no frost expected tonight

Tomorrow’s Forecast

Monday, August 18

• Mostly cloudy skies throughout the day

• High: 17°C

• UV Index: 5 – Moderate

• Night: Cloudy with a mild low of 10°C

Tuesday, August 19

• Cloudy through the day

• High: 19°C

• Night: Clearing skies, low: 9°C

Wednesday, August 20

• Sunny and warm – a return to summer!

• High: 24°C

• Night: Clear and mild, low: 15°C

👕 Wardrobe & Outdoor Tips

• Sunday Morning: Dress warmly in layers; gloves or a light hat might be helpful for early risers.

• Sunday Afternoon: Shed layers as sunshine brings a pleasant high of 19°C.

• Monday–Tuesday: Light jacket or hoodie recommended; clouds will keep temperatures cooler.

• Wednesday: Break out the t-shirts again! Great day for hiking, boating, or enjoying the outdoors.

🌿 Garden & Crop Protection Tips

• Cover frost-sensitive plants like tomatoes, peppers, beans, or flowers with frost cloths or blankets overnight.

• Move potted plants into sheltered areas if possible.

• Avoid watering late in the day — moist soil can freeze more easily in near-zero temperatures.

Weather Trivia

Did you know? Frost can occur even when the official air temperature is just a couple degrees above zero. That’s because ground-level air cools faster, especially under calm, clear skies like those in Armstrong early this morning.