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December weather forecast in St Catharines

30 days Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

30 days Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Sun

Sunday

Mon

Monday

Tue

Tuesday

Wed

Wednesday

Thu

Thursday

Fri

Friday

Sat

Saturday

30 November, sun

	752 mmHg		77%
	7.3 m/s		+6

30 November, Sunday. day, 6°; night, 3°; rain

1 December, mon

	751 mmHg		76%
	8.2 m/s		+6

1 December, Monday. day, 6°; night, 2°; rain

2 December, tue

	753 mmHg		76%
	7.4 m/s		+6

2 December, Tuesday. day, 5°; night, 2°; rain

3 December, wed

	754 mmHg		76%
	6.9 m/s		+5

3 December, Wednesday. day, 5°; night, 1°; clear

4 December, thu

	754 mmHg		76%
	7.1 m/s		+5

4 December, Thursday. day, 5°; night, 2°; clear

5 December, fri

	754 mmHg		75%
	7.2 m/s		+5

5 December, Friday. day, 4°; night, 2°; rain

6 December, sat

	754 mmHg		74%
	7.6 m/s		+5

6 December, Saturday. day, 3°; night, 0°; rain

7 December, sun

	754 mmHg		74%
	7.1 m/s		+4

7 December, Sunday. day, 3°; night, 0°; partly cloudy

8 December, mon

	756 mmHg		73%
	6.4 m/s		+4

8 December, Monday. day, 2°; night, 0°; partly cloudy

9 December, tue

	755 mmHg		75%
	6.7 m/s		+5

9 December, Tuesday. day, 3°; night, 0°; partly cloudy

10 December, wed

	753 mmHg		77%
	7.6 m/s		+4

10 December, Wednesday. day, 4°; night, 1°; rain

11 December, thu

	753 mmHg		77%
	7.7 m/s		+5

11 December, Thursday. day, 3°; night, 0°; rain

12 December, fri

	755 mmHg		77%
	7.6 m/s		+4

12 December, Friday. day, 3°; night, 0°; clear

13 December, sat

	756 mmHg		75%
	6.9 m/s		+4

13 December, Saturday. day, 2°; night, 0°; partly cloudy

14 December, sun

	756 mmHg		77%
	7.2 m/s		+4

14 December, Sunday. day, 3°; night, 0°; rain

15 December, mon

	755 mmHg		78%
	7.6 m/s		+4

15 December, Monday. day, 3°; night, 0°; rain

16 December, tue

	754 mmHg		76%
	7.7 m/s		+4

16 December, Tuesday. day, 3°; night, 0°; overcast

17 December, wed

	752 mmHg		78%
	7.1 m/s		+4

17 December, Wednesday. day, 3°; night, 0°; rain

18 December, thu

	754 mmHg		75%
	6.8 m/s		+4

18 December, Thursday. day, 2°; night, 0°; overcast

19 December, fri

	755 mmHg		74%
	7.3 m/s		+4

19 December, Friday. day, 2°; night, -1°; overcast

20 December, sat

	755 mmHg		76%
	7 m/s		+3

20 December, Saturday. day, 1°; night, -1°; partly cloudy

21 December, sun

	754 mmHg		76%
	7 m/s		+4

21 December, Sunday. day, 2°; night, -1°; overcast

22 December, mon

	754 mmHg		76%
	7.4 m/s		+4

22 December, Monday. day, 2°; night, 0°; overcast

23 December, tue

	754 mmHg		79%
	7.2 m/s		+4

23 December, Tuesday. day, 3°; night, 0°; rain

24 December, wed

	753 mmHg		78%
	7.4 m/s		+4

24 December, Wednesday. day, 2°; night, 0°; rain

25 December, thu

	754 mmHg		78%
	7.4 m/s		+4

25 December, Thursday. day, 1°; night, -1°; snow

26 December, fri

	755 mmHg		78%
	7.2 m/s		+4

26 December, Friday. day, 1°; night, -1°; partly cloudy

27 December, sat

	755 mmHg		79%
	6.9 m/s		+4

27 December, Saturday. day, 1°; night, -1°; snow

28 December, sun

	753 mmHg		78%
	7.5 m/s		+4

28 December, Sunday. day, 2°; night, 0°; overcast

29 December, mon

	753 mmHg		78%
	7 m/s		+4

29 December, Monday. day, 2°; night, 0°; overcast

30 December, tue

	752 mmHg		77%
	7.2 m/s		+4

30 December, Tuesday. day, 2°; night, 0°; overcast

31 December, wed

	753 mmHg		78%
	7.5 m/s		+4

31 December, Wednesday. day, 2°; night, -1°; rain

1 January, thu

	754 mmHg		77%
	7.9 m/s		+3

1 January, Thursday. day, 1°; night, -1°; rain

2 January, fri

	755 mmHg		76%
	7.8 m/s		+3

2 January, Friday. day, 1°; night, -2°; partly cloudy

3 January, sat

	754 mmHg		79%
	7.8 m/s		+3

3 January, Saturday. day, 0°; night, -1°; rain

Average data for 10 years

St Catharines December

3

sunny days

14

days with precipitation

17

cloudy days

3 sunny days; 14 days with precipitation; 17 cloudy days;

76

%

air humidity

5.2

m/s

WindSW

88

mm of precipitation

(9% of annual average)

+4

°C

Water temperature

air humidity 76%; 88 millimeters of precipitation (9% of annual average); Wind south-westerly 5.2 Meters per second; Water temperature +4°

Weather graphs for December

TemperatureWater temperaturePrecipitation chance, %Humidity, %Wind, m/sPressure, mmHg

SW

SW

SW

SW

SW

SW

SW

SW

S

SW

SW

SW

SW

S

S

S

SW

SW

SW

SW

SW

SW

SW

SW

S

S

SW

SW

SW

SW

SW

1

Average data for 10 years

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

Daytime temperature

Night-time temperature

Cities near you

Toronto
Detroit
Pittsburgh
Cleveland
Macedonia
Burlington
Buffalo
Milan
London

Cities with similar weather in December

Helsinki
Riga
Tallinn
Stockholm
Reykyavik
Oslo
Yurmala
Aktau
Palanga

The weather forecast for December 2025 is based on historical data from the past 10 years.

In December, the weather in St Catharines is typically cold. Average daily high temperature in December is about 3 degrees above zero. On average, St Catharines has 12 cloudy, 8 rainy, 6 partly cloudy, 3 sunny, and 2 snowy days in December. The rains are usually heavy. December as well as January, February, March, and April is considered the most uncomfortable time to visit St Catharines.

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