< Previous Month Next Month >

St. Catharines December Weather

Averages and records for weather in St. Catharines, Ontario in the month of December.

Typical St. Catharines December Weather 1991–2020
Average daily high	3.6 °C
Average daily low	-1.6 °C
Average monthly precipitation	4.8 cm
Daily chance of precipitation	37.1%

St. Catharines December Weather Records 1882–2024
Highest temperature	21.0 °C	December 3, 1982
Lowest temperature	-24.4 °C	December 27, 1925
Highest daily low	12.2 °C	December 9, 1966
Lowest daily high	-17.8 °C	December 29, 1933
Hottest average high temperature	7.9 °C	2015
Coldest average high temperature	-2.6 °C	1989
Most daily precipitation	4.2 cm	December 11, 1944
Most monthly precipitation	10.9 cm	1990

Note: Daily averages are a moving average which includes 14 days before and after

Day	Average (°C)		Record (°C)
Day	High	Low	High	Low
December 1	5.9	0.5	16.1	-12.2
December 2	5.8	0.4	14.5	-15.0
December 3	5.6	0.3	21.0	-12.2
December 4	5.4	0.1	17.4	-16.1
December 5	5.2	-0.1	18.7	-14.4
December 6	5.0	-0.3	19.2	-14.4
December 7	4.8	-0.4	18.9	-15.6
December 8	4.7	-0.5	19.4	-11.1
December 9	4.6	-0.6	15.5	-13.3
December 10	4.4	-0.8	16.1	-12.2
December 11	4.2	-1.0	18.9	-13.3
December 12	4.0	-1.1	15.0	-12.2
December 13	3.9	-1.3	14.4	-14.0
December 14	3.8	-1.5	16.7	-14.4
December 15	3.6	-1.6	17.8	-15.6
December 16	3.4	-1.8	17.1	-16.1
December 17	3.3	-1.9	12.0	-18.3
December 18	3.2	-2.1	13.9	-18.3
December 19	3.0	-2.3	12.2	-21.1
December 20	2.9	-2.4	13.5	-18.9
December 21	2.8	-2.6	16.7	-18.3
December 22	2.7	-2.7	15.6	-17.0
December 23	2.6	-2.8	12.8	-15.0
December 24	2.5	-2.9	17.5	-21.7
December 25	2.4	-3.1	17.0	-22.0
December 26	2.3	-3.2	13.5	-15.6
December 27	2.2	-3.3	17.2	-24.4
December 28	2.2	-3.4	19.0	-20.6
December 29	2.2	-3.4	15.0	-20.6
December 30	2.2	-3.5	14.4	-19.4
December 31	2.0	-3.7	14.4	-15.0

Weather Station Details

Years	Station	Coordinates
1995–2024	Port Weller (AUT)	location
1882–1994	St Catherines	location