Definitions

Clearest skies year-round

 - the greatest number of hours annually with total cloud amount between 0 and 2 tenths

Cloudiest skies year-round

 - the greatest number of hours annually with total cloud amount between 8 and 10 tenths

Coldest spring

 - the lowest average daily temperature in March, April and May

Coldest winter

 - the lowest average night-time temperature in December, January, and February

Coldest year-round

 - the lowest average of all daily temperatures for the year

Coolest summer

 - the lowest average afternoon temperature in June, July and August

Driest location

 - the least amount of total annual rain and snow

Driest summer air

 - the lowest average hourly vapour pressure (kPa) in June, July and August

Driest winter air

 - the lowest average hourly vapour pressure (kPa) in December, January and February

Extreme wind chill

 - the highest wind chill in the period between 1952 and 2000

Fewest fog days

 - the fewest number of days annually with an occurrence of fog (fog, ice fog, or freezing fog)

Fewest freezing days

 - the fewest number of days annually with the lowest temperature at or below 0 °C

Fewest snow days

 - the fewest number of days annually with measurable snowfall at or above 0.2 cm

Fewest sunny days year-round

 - the fewest number of days annually with an occurrence of sunshine

Fewest thunderstorm days

 - the fewest number of days annually with an occurrence of a thunderstorm

Foggiest location (days)

 - the greatest number of days annually with an occurrence of fog (fog, ice fog or freezing fog)

Greatest average pressure difference

 - the greatest difference between highest and lowest monthly average sea level pressure (kPa)

Greatest average snow depth January 31

 - the deepest median daily snow depth on January 31

High humidex days at or above 35

 - the greatest number of days annually with humidex at or above 35

Highest average pressure

 - the highest hourly average sea level pressure (kPa) annually

Hottest summer

 - the highest average afternoon temperature in June, July, and August

Humidex days at or above 30

 - the greatest number of days annually with humidex at or above 30

Least sunshine year-round

 - the fewest number of hours annually with sunshine

Lightest wind speed year-round

 - the lowest average hourly wind speed (km/h) annually

Longest snow cover season (days)

 - the greatest number of days annually with snow covering the ground to a depth of at least 1 cm

Lowest average pressure

 - the lowest hourly average sea level pressure (kPa) annually

Lowest snowfall

 - the least amount of total annual snowfall (cm)

Mildest winter

 - the highest average afternoon temperature in December, January and February

Most blowing snow days

 - the greatest number of days annually with an occurrence of blowing snow

Most clear skies in summer

 - the greatest number of hours in June, July and August with total cloud amount between 0 and 2 tenths

Most cold days (-20°C or less)

 - the greatest number of days annually with a daily low temperature of -20°C or below

Most cooling degree-days

 - the greatest number of cooling degree-days annually (accumulated average daily temperature above 18°C)

Most days with light wind (5 km/h or less)

 - the greatest number of days with at least one hour's wind speed at or less than 5 km/h

Most deep snow cover days (10 cm or more)

 - the greatest number of days annually with snow covering the ground to a depth of at least 10 cm

Most dry days

 - the greatest number of days annually with no measurable precipitation

Most freezing days

 - the greatest number of days annually with the lowest temperature at or below 0°C

Most freezing days summer

 -most freezing days from May to August inclusive (minimum temperature at or below 0)

Most freezing rain days

 - the greatest number of days annually with an occurrence of freezing rain or drizzle

Most growing degree-days

 - the greatest number of growing degree-days annually (accumulated average daily temperature above 5°C)

Most heating degree-days

 - the greatest number of heating degree-days annually (accumulated average daily temperature below 18°C)

Most heavy snowfall days (10 cm or more)

 - the greatest number of days annually with a snowfall at or above 10 cm

Most high wind chill days (-30 or less)

 - the greatest number of days with an occurrence of wind chill less than -30

Most hot and cold days

 - the greatest number of days annually with daily highs of 30°C or above and daily lows of -20°C or below

Most hot days (30°C or above)

 - the greatest number of days annually with a daily high temperature of 30°C or above

Most hours with low visibility

 - le plus grand nombre d'heures par année où la visibilité est de moins de 1 km.

Most huge snowfall days (25 cm or more)

 - the greatest number of days annually with a snowfall at or above 25 cm

Most humid summer location

 - the highest average hourly vapour pressure (kPa) in June, July and August

Most smoke and haze days

 - the greatest number of days annually with an occurrence of smoke or haze

Most snow days

 - the greatest number of days annually with measurable snowfall at or above 0.2 cm

Most sunny days in cold months

 - the greatest number of days from November through March inclusive with an occurrence of sunshine

Most sunny days in warm months

 - the greatest number of days from May through September inclusive with an occurrence of sunshine

Most sunny days year-round

 - the greatest number of days annually with an occurrence of sunshine

Most thunderstorm days

 - the greatest number of days annually with an occurrence of a thunderstorm

Most very wet days (25 mm or more)

 - the greatest number of days annually with precipitation at or more than 25 mm

Most wet days

 - the greatest number of days annually with measurable precipitation at or above 0.2 mm

Most wet days during the warm season

 - most wet days (at or > 0.2 mm) during the warm season of May through August, inclusive

Most windy days (40 km/h or more)

 - the greatest number of days annually with at least one hour's wind speed above 40 km/h

Rainiest location

 - the greatest total annual rainfall (mm)

Snowfall as a % of precipitation

 - the annual total snowfall (cm) as a % of annual total precipitation (mm)

Snowiest fall

 - the greatest total snowfall in September, October and November

Snowiest location

 - the greatest total annual snowfall (cm)

Snowiest spring

 - the greatest total snowfall in March, April and May

Sunniest fall

 - the greatest number of hours of sunshine in September, October and November

Sunniest spring

 - the greatest number of hours of sunshine in March, April and May

Sunniest summer

 - the greatest number of hours of sunshine in June, July and August

Sunniest winter

 - the greatest number of hours of sunshine in December, January and February

Sunniest winter and spring

 - greatest average number of hours of bright sunshine between December and May, inclusive

Sunniest year-round

 - the greatest number of hours annually with sunshine

Warmest fall

 - the highest average daily temperature in September, October and November

Warmest spring

 - the highest average daily temperature in March, April and May

Warmest year-round

 - the highest average of all daily temperatures for the year

Wettest location (rain and snow)

 - the greatest total annual rain and snow

Windiest location year-round

 - the highest average hourly wind speed (km/h) annually

Windiest summer

 - the highest average hourly wind speed (km/h) in June, July and August

Windiest winter

 - the highest average hourly wind speed (km/h) in December, January and February