Environnement Canada
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Notices:

We are pleased to announce that David Phillips’ Weather Winners analysis of Canada’s provinces, territories and 100 largest cities is now a part of our website. It can be accessed by clicking the “Weather Winners” link on the left menu bar.


The Notice Inventory contains a record of all past and current Notices.

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 city - 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 city (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 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 - the greatest number of hours annually with visibility less than 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 city - 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 city - the greatest total annual rainfall (mm).

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

Snowiest city - the greatest total annual snowfall (cm).

Snowiest fall - the greatest total snowfall in September, October and November.

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 city (rain and snow) - the greatest total annual rain and snow.

Windiest city 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.



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