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Canada weather

Weather in Alliston for December 2025

Your guide to Alliston weather in December - trends and predictions

    Official Weather Alert ⚠️

  • Snow Squall Warning - See hour by hour.

    • Snow Forecast ❄️

  • Expect heavy snowfall in Alliston during December, with an average of 17 snowy days.
    According to Alliston snow forecast for December 2025, 4 snowy days are expected until the end of the month. The closest date with snow is Monday, 22 December.

    • Temperatures

  • Until now, December 2025 in Alliston is cooler than usual, with temperatures averaging -1.6 °C, this is -2.4 °C below the typical seasonal average.

  • The forecast for the next days in Alliston predicts temperatures to be around -1 °C, close to the historical average.

  • In general, the average temperature in Alliston at the beginning of December is 0.4 °C. As the month progressed, temperatures tended to noticeably cool down, reaching an average of -2 °C by the end of December.

    • More

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
9
Dry days
Average rainy days
5
Rainy days
Average snowy days
17
Snow days
Average temperatures
1°/-2°
Temperatures
Average wind speed
19 km/h
Avg max wind
Average humidity
87 %
Avg humidity

Alliston Weather December

Move between months or click on a day
November
January
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Heavy snow
0°
2
Light sleet
1°
3
Heavy snow
1°
4
Overcast
-0°
5
Mist
-0°
6
Patchy light snow
-0°
7
Heavy snow
1°
8
Overcast
-0°
9
Thundery outbreaks possible
4°
10
Moderate snow
4°
11
Moderate or heavy snow showers
-2°
12
Light snow showers
0°
13
Patchy light snow
-2°
14
Overcast
-2°
15
Partly cloudy
1°
16
Overcast
2°
17
Overcast
4°
18
Light snow showers
3°
19
Overcast
-0°
20
Overcast
-0°
21
Weather Alert Light freezing rain
-4°
22
Moderate snow
0°
23
Moderate or heavy snow showers
1°
24
Mist
0°
25
Fog
1°
26
Fog
2°
27
Sunny
-12°
28
Sunny
-5°
29
Light freezing rain
0°
30
Overcast
1°
31
Partly cloudy
-1°

Temperatures trend during December in Alliston

See the weather trend as well as the moving average line

December weather in Alliston day by day

Click on a date for more information
November January
Date Weather Temperatures Rain Snow More
1 Dec. Heavy snow
Heavy snow
 0° /-2° 2.9 mm 2.3 cm
2 Dec. Light sleet
Light sleet
 1° /-2° 4.9 mm 2.2 cm
3 Dec. Heavy snow
Heavy snow
 1° /-3° 4.8 mm 3.1 cm
4 Dec. Overcast
Overcast
 0° /-4° 4.8 mm 2.8 cm
5 Dec. Mist
Mist
 0° /-8° 2 mm 0.6 cm
6 Dec. Patchy light snow
Patchy light snow
 0° /-5° 6.2 mm 4.4 cm
7 Dec. Heavy snow
Heavy snow
 1° /-5° 7.1 mm 5.2 cm
8 Dec. Overcast
Overcast
 0° /-5° 1.4 mm 0.4 cm
9 Dec. Thundery outbreaks possible
Thundery outbreaks possible
 4° /-3° 1.5 mm 0.4 cm
10 Dec. Moderate snow
Moderate snow
 4° /-2° 7.2 mm 5 cm
11 Dec. Moderate or heavy snow showers
Moderate or heavy snow showers
 -2° /-4° 5.1 mm 3.7 cm
12 Dec. Light snow showers
Light snow showers
 0° /-5° 9.3 mm 6.7 cm
13 Dec. Patchy light snow
Patchy light snow
 -2° /-6° 0.1 mm 0 cm
14 Dec. Overcast
Overcast
 -2° /-7° 2.3 mm 1.7 cm
15 Dec. Partly cloudy
Partly cloudy
 1° /-3° 1.3 mm 0.4 cm
16 Dec. Overcast
Overcast
 2° /-3° 0.6 mm 0 cm
17 Dec. Overcast
Overcast
 4° /0° 1.8 mm 0 cm
18 Dec. Light snow showers
Light snow showers
 3° /-3° 14.6 mm 4.6 cm
19 Dec. Overcast
Overcast
 0° /-6° 3.7 mm 0 cm
20 Dec. Overcast
Overcast
 0° /-3° 0 mm 0 cm
21 Dec. Light freezing rain
Light freezing rain
 -4° /-9° 0.3 mm 0 cm
22 Dec. Moderate snow
Moderate snow
 0° /-6° 1.3 mm 0.9 cm
23 Dec. Moderate or heavy snow showers
Moderate or heavy snow showers
 1° /-2° 2.2 mm 1.6 cm
24 Dec. Mist
Mist
 0° /-1° 0.7 mm 0.4 cm
25 Dec. Fog
Fog
 1° /-1° 3.3 mm 1.8 cm
26 Dec. Fog
Fog
 2° /-12° 0.4 mm 0 cm
27 Dec. Sunny
Sunny
 -12° /-16° 0 mm 0 cm
28 Dec. Sunny
Sunny
 -5° /-13° 0 mm 0 cm
29 Dec. Light freezing rain
Light freezing rain
 0° /-6° 2.1 mm 0 cm
30 Dec. Overcast
Overcast
 1° /-2° 0.1 mm 0 cm
31 Dec. Partly cloudy
Partly cloudy
 -1° /-4° 0 mm 0 cm
Next
Important Notice
Our weather forecast for Alliston in December is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Alliston forecast closer to your planned date for the most up-to-date weather information.
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Alliston in December - FAQ

What are the expected maximum and minimum temperatures in Alliston during December?
Brace for cold days with temperatures not exceeding 1° and nights that are likely to be freezing. Winter clothing is essential for comfort and safety.
How much rainfall should be expected in Alliston during December?
Significant rainfall exceeding 138.7 mm is expected in Alliston during December, occurring over more than 5 days. Preparing for wet conditions is recommended in your planning.
Will it snow in Alliston in December 2025?
Alliston experiences an average snowfall of 57.685 cm during December, occurring over 17 days.
What are the typical wind conditions in Alliston during December?
The average wind speed in Alliston during December is 19 km/h, suggesting breezy to windy conditions, depending on your activities.

Alliston snow forecast December 2025

Track daily snowfall levels and discover Alliston’s snowy potential this December ❄️
On average, Alliston sees 17 snowy days during December, with approximately 57.7 cm of total snowfall.

December rainfall patterns in Alliston

Explore the daily rainfall trends and prepare for Allistons December weather 💧
Typically, Alliston has 5 rainy days in December with a total of 138.7 mm of rainfall.

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Location coordinates Where is Alliston?

Get accurate weather forecasts for Alliston, located at latitude 44.15 and longitude -79.866. Stay updated with localized weather information tailored for Alliston.

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