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Weather in St. Catharines for December 2025

Your guide to St. Catharines weather in December - trends and predictions

    Snow Forecast ❄️

  • With an average of 5 snowy days, St. Catharines usually enjoys a light touch of snow in December.
    According to St. Catharines snow forecast for December 2025, 5 snowy days are expected until the end of the month. The closest date with snow is Monday, 15 December.

    • Temperatures

  • Until now, December 2025 in St. Catharines is cooler than usual, with temperatures averaging 0.4 °C, this is -2.5 °C below the typical seasonal average.

  • Expect cooler weather in the next days in St. Catharines with the forecast suggesting a temperature of -0.1 °C, lower than the historical average.

  • In general, the average temperature in St. Catharines at the beginning of December is 2.4 °C. As the month progressed, temperatures tended to noticeably cool down, reaching an average of -0.3 °C by the end of December.

    • More

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

Average dry days
12
Dry days
Average rainy days
14
Rainy days
Average snowy days
5
Snow days
Average temperatures
4°/0°
Temperatures
Average wind speed
28 km/h
Avg max wind
Average humidity
81 %
Avg humidity

St. Catharines Weather December

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

Temperatures trend during December in St. Catharines

See the weather trend as well as the moving average line

December weather in St. Catharines day by day

Click on a date for more information
November January
Date Weather Temperatures Rain Snow More
1 Dec. Overcast
Overcast
 3° /-1° 3.5 mm 0 cm
2 Dec. Light rain
Light rain
 3° /0° 7 mm 4 cm
3 Dec. Overcast
Overcast
 4° /-1° 6.2 mm 0 cm
4 Dec. Overcast
Overcast
 2° /-1° 0.4 mm 0 cm
5 Dec. Overcast
Overcast
 1° /-2° 1.2 mm 0 cm
6 Dec. Overcast
Overcast
 1° /-1° 0 mm 0 cm
7 Dec. Heavy snow
Heavy snow
 3° /-1° 5.5 mm 3.5 cm
8 Dec. Fog
Fog
 3° /-2° 0 mm 0 cm
9 Dec. Patchy rain possible
Patchy rain possible
 6° /0° 12.5 mm 0.4 cm
10 Dec. Moderate rain
Moderate rain
 7° /1° 16.3 mm 2.3 cm
11 Dec. Light snow
Light snow
 2° /-2° 0.2 mm 0.1 cm
12 Dec. Cloudy
Cloudy
 2° /-3° 0 mm 0 cm
13 Dec. Patchy light snow
Patchy light snow
 1° /-4° 0 mm 0 cm
14 Dec. Overcast
Overcast
 0° /-5° 0 mm 0 cm
15 Dec. Light freezing rain
Light freezing rain
 -4° /-10° 1.2 mm 0.6 cm
16 Dec. Partly cloudy
Partly cloudy
 0° /-7° 0 mm 0 cm
17 Dec. Overcast
Overcast
 3° /-1° 0 mm 0 cm
18 Dec. Moderate rain
Moderate rain
 6° /-3° 7.4 mm 0 cm
19 Dec. Patchy rain possible
Patchy rain possible
 3° /-3° 0.9 mm 0 cm
20 Dec. Overcast
Overcast
 2° /-4° 0 mm 0 cm
21 Dec. Heavy snow
Heavy snow
 2° /-3° 0.6 mm 0.3 cm
22 Dec. Partly cloudy
Partly cloudy
 -2° /-5° 0 mm 0 cm
23 Dec. Partly cloudy
Partly cloudy
 6° /1° 0 mm 0 cm
24 Dec. Cloudy
Cloudy
 3° /-3° 0.1 mm 0 cm
25 Dec. Cloudy
Cloudy
 -5° /-7° 0 mm 0 cm
26 Dec. Heavy snow
Heavy snow
 -2° /-9° 2.6 mm 1.8 cm
27 Dec. Overcast
Overcast
 -7° /-12° 0 mm 0 cm
28 Dec. Light freezing rain
Light freezing rain
 -6° /-9° 0 mm 0 cm
29 Dec. Light drizzle
Light drizzle
 8° /4° 16.6 mm 0 cm
30 Dec. Patchy rain possible
Patchy rain possible
 6° /1° 0.8 mm 0 cm
31 Dec. Light snow
Light snow
 4° /1° 5.8 mm 0.6 cm
Next
Important Notice
Our weather forecast for St. Catharines 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 St. Catharines forecast closer to your planned date for the most up-to-date weather information.
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St. Catharines in December - FAQ

What are the expected maximum and minimum temperatures in St. Catharines during December?
Brace for cold days with temperatures not exceeding 4° and nights that are likely to be freezing. Winter clothing is essential for comfort and safety.
How much rainfall should be expected in St. Catharines during December?
Significant rainfall exceeding 120.4 mm is expected in St. Catharines during December, occurring over more than 14 days. Preparing for wet conditions is recommended in your planning.
Will it snow in St. Catharines in December 2025?
St. Catharines experiences an average snowfall of 9.5 cm during December, occurring over 5 days.
What are the typical wind conditions in St. Catharines during December?
The average wind speed in St. Catharines during December is 28 km/h, suggesting breezy to windy conditions, depending on your activities.

St. Catharines snow forecast December 2025

Track daily snowfall levels and discover St. Catharines’s snowy potential this December ❄️
On average, St. Catharines sees 5 snowy days during December, with approximately 9.5 cm of total snowfall.

December rainfall patterns in St. Catharines

Explore the daily rainfall trends and prepare for St. Cathariness December weather 💧
Typically, St. Catharines has 14 rainy days in December with a total of 120.4 mm of rainfall.

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Get accurate weather forecasts for St. Catharines, located at latitude 43.171 and longitude -79.243. Stay updated with localized weather information tailored for St. Catharines.

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