December weather forecastSaint Catharines, Canada
December
Weather in December
December, the first month of the winter in Saint Catharines, is also a wintry month, with an average temperature varying between 2.4°C (36.3°F) and -1.5°C (29.3°F).Temperature
During the transition into December, Saint Catharines observes a decrease in the average high-temperature, falling from a frosty 7.8°C (46°F) in November to an icy 2.4°C (36.3°F). Nighttime temperatures in Saint Catharines during December report a consistent average of -1.5°C (29.3°F).Humidity
The average relative humidity in December in Saint Catharines is 80%.Rainfall
In Saint Catharines, Canada, during December, the rain falls for 11.8 days and regularly aggregates up to 56mm (2.2") of precipitation. In Saint Catharines, Canada, during the entire year, the rain falls for 177.2 days and collects up to 786mm (30.94") of precipitation.Snowfall
Months with snowfall in Saint Catharines are January through May, October through December. In Saint Catharines, in December, snow falls for 12.5 days, with typically accumulated 76mm (2.99") of snow. In Saint Catharines, Canada, during the entire year, snow falls for 58.5 days and aggregates up to 403mm (15.87") of snow.Sea temperature
In Saint Catharines, the average seawater temperature in December is 4.9°C (40.8°F).Note: In swimming, this condition is considered life-threatening and perilous. The painful sensation of cold water leads to immediate hyperventilation. Utilizing a specialized swimsuit is critical to reduce thermal injury.
Daylight
The month with the shortest days is December, with an average of 9h and 6min of daylight.On the first day of the month, sunrise is at 7:29 am and sunset at 4:42 pm. On the last day of December, sunrise is at 7:48 am and sunset at 4:51 pm EST.
Sunshine
In Saint Catharines, the average sunshine in December is 3.2h.UV index
The months with the lowest UV index in Saint Catharines are January and December, with an average maximum UV index of 1. A UV Index estimate of 2, and below, represents a minimal health hazard from exposure to the Sun's UV radiation for average individuals.Note: The UV index of 1 during December leads to these advisories:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brimmed hat provides unparalleled sun protection for sensitive areas like the eyes, ears, and neck. Be watchful! The reflection of snow can enhance the intensity of the Sun's UV radiation nearly double.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Saint Catharines, Canada
- Average high temperature in December: 2.4°C
The warmest month (with the highest average high temperature) is July (24.8°C).
The month with the lowest average high temperature is January (-1.4°C).
- Average low temperature in December: -1.5°C
The month with the highest average low temperature is July (18.6°C).
The coldest month (with the lowest average low temperature) is January (-6.1°C).
Average pressure in December
Saint Catharines, Canada
- Average pressure in December: 1017.7mbar
The month with the highest atmospheric pressure is November (1018.5mbar).
The month with the lowest atmospheric pressure is June (1013.3mbar).
Average wind speed in December
Saint Catharines, Canada
- Average wind speed in December: 19.7km/h
The windiest month (with the highest average wind speed) is January (21km/h).
The calmest month (with the lowest average wind speed) is July (12.1km/h).
Average humidity in December
Saint Catharines, Canada
- Average humidity in December: 80%
The months with the highest relative humidity are January and February (83%).
The month with the lowest relative humidity is September (74%).
Average rainfall in December
Saint Catharines, Canada
- Average rainfall in December: 56mm
The wettest month (with the highest rainfall) is July (80mm).
The driest months (with the least rainfall) are September and November (55mm).
Average rainfall days in December
Saint Catharines, Canada
- Average rainfall days in December: 11.8 days
The month with the highest number of rainy days is October (18.9 days).
The month with the least rainy days is February (8.8 days).
Average snowfall in December
Saint Catharines, Canada
- Average snowfall in December: 76mm
The month with the highest snowfall is February (127mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in December
Saint Catharines, Canada
- Average snowfall days in December: 12.5 days
The month with the highest number of snowfall days is February (14.1 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average sea temperature in December
Saint Catharines, Canada
- Average sea temperature in December: 4.9°C
The best month for swimming (with the highest average sea temperature) is August (23.2°C).
The coldest month (with the lowest average sea temperature) is February (1.7°C).
Average daylight in December /
Average sunshine in December
Saint Catharines, Canada
- Average daylight in December: 9h and 6min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in December: 3h and 12min
The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is January (Average sunshine: 2h and 48min).
Average sunshine days in December
Saint Catharines, Canada
- Average sunshine days in December: 8.8 days
The month with the most sunshine days is September (13 days).
The month with the least sunshine days is January (7.5 days).
Average UV index in December
Saint Catharines, Canada
- Average UV index in December: 1
The months with the highest UV index are July and August (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in December
Saint Catharines, Canada
- Average cloud cover in December: 66
The month with the most cloud cover is January (Cloud cover 71).
The month with the least cloud cover is August (Cloud cover 27).
Average visibility in December
Saint Catharines, Canada
- Average visibility in December: 9km
The months with the highest visibility are June, July, August and September (10km).
The months with the lowest visibility are January and February (8km).
